CHANGELOG.md

Changelog

Cargo 1.47 (2020-10-08)

4f74d9b2...HEAD

Added

Changed

• The comments added to .gitignore when it is modified have been tweaked to add some spacing. #8476
• cargo metadata output should now be sorted to be deterministic. #8489
• By default, build scripts and proc-macros are now built with opt-level=0 and the default codegen units, even in release mode. #8500

Fixed

• Fixed issue where if a project directory was moved, and one of the build scripts did not use the rerun-if-changed directive, then that build script was being rebuilt when it shouldn't. #8497

Nightly only

• Added support for -Z terminal-width which tells rustc the width of the terminal so that it can format diagnostics better. docs #8427
• Added ability to configure -Z unstable flags in config files via the [unstable] table. docs #8393
• Added [-Z build-std-features] flag to set features for the standard library. #8490

Cargo 1.46 (2020-08-27)

9fcb8c1d...rust-1.46.0

Added

• The dl key in config.json of a registry index now supports the replacement markers {prefix} and {lowerprefix} to allow spreading crates across directories similar to how the index itself is structured. docs #8267
• Added new environment variables that are set during compilation:
  • CARGO_CRATE_NAME: The name of the crate being built.
  • CARGO_BIN_NAME: The name of the executable binary (if this is a binary crate).
  • CARGO_PKG_LICENSE: The license field from the manifest.
  • CARGO_PKG_LICENSE_FILE: The license-file field from the manifest. #8270 #8325 #8387
• If the value for readme is not specified in Cargo.toml, it is now automatically inferred from the existence of a file named README, README.md, or README.txt. This can be suppressed by setting readme = false. #8277
• cargo install now supports the --index flag to install directly from an index. #8344
• Added the metadata table to the workspace definition in Cargo.toml. This can be used for arbitrary data similar to the package.metadata table. #8323
• Added the --target-dir flag to cargo install to set the target directory. #8391
• Changes to environment variables used by the env! or option_env! macros are now automatically detected to trigger a rebuild. #8421
• The target directory now includes the CACHEDIR.TAG file which is used by some tools to exclude the directory from backups. #8378
• Added docs about rustup's +toolchain syntax. #8455

Changed

• A warning is now displayed if a git dependency includes a # fragment in the URL. This was potentially confusing because Cargo itself displays git URLs with this syntax, but it does not have any meaning outside of the Cargo.lock file, and would not work properly. #8297
• Various optimizations and fixes for bitcode embedding and LTO. #8349
• Reduced the amount of data fetched for git dependencies. If Cargo knows the branch or tag to fetch, it will now only fetch that branch or tag instead of all branches and tags. #8363
• Enhanced git fetch error messages. #8409
• .crate files are now generated with GNU tar format instead of UStar, which supports longer file names. #8453

Fixed

• Fixed a rare situation where an update to Cargo.lock failed once, but then subsequent runs allowed it proceed. #8274
• Removed assertion that Windows dylibs must have a .dll extension. Some custom JSON spec targets may change the extension. #8310
• Updated libgit2, which brings in a fix for zlib errors for some remote git servers like googlesource.com. #8320
• Fixed the GitHub fast-path check for up-to-date git dependencies on non-master branches. #8363
• Fixed issue when enabling a feature with pkg/feature syntax, and pkg is an optional dependency, but also a dev-dependency, and the dev-dependency appears before the optional normal dependency in the registry summary, then the optional dependency would not get activated. #8395
• Fixed clean -p deleting the build directory if there is a test named build. #8398
• Fixed indentation of multi-line Cargo error messages. #8409
• Fixed issue where the automatic inclusion of the --document-private-items flag for rustdoc would override any flags passed to the cargo rustdoc command. #8449
• Cargo will now include a version in the hash of the fingerprint directories to support backwards-incompatible changes to the fingerprint structure. #8473 #8488

Nightly only

• Added -Zrustdoc-map feature which provides external mappings for rustdoc (such as https://docs.rs/ links). docs #8287
• Fixed feature calculation when a proc-macro is declared in Cargo.toml with an underscore (like proc_macro = true). #8319
• Added support for setting -Clinker with -Zdoctest-xcompile. #8359
• Fixed setting the strip profile field in config files. #8454

Cargo 1.45 (2020-07-16)

ebda5065e...rust-1.45.0

Added

Changed

• Changed official documentation to recommend .cargo/config.toml filenames (with the .toml extension). .toml extension support was added in 1.39. #8121

• The registry.index config value is no longer allowed (it has been deprecated for 4 years). #7973

• An error is generated if both --index and --registry are passed (previously --index was silently ignored). #7973

• The registry.token config value is no longer used with the --index flag. This is intended to avoid potentially leaking the crates.io token to another registry. #7973

• Added a warning if registry.token is used with source replacement. It is intended this will be an error in future versions. #7973

• Windows GNU targets now copy .dll.a import library files for DLL crate types to the output directory. #8141

• Dylibs for all dependencies are now unconditionally copied to the output directory. Some obscure scenarios can cause an old dylib to be referenced between builds, and this ensures that all the latest copies are used. #8139

• package.exclude can now match directory names. If a directory is specified, the entire directory will be excluded, and Cargo will not attempt to inspect it further. Previously Cargo would try to check every file in the directory which could cause problems if the directory contained unreadable files. #8095

• When packaging with cargo publish or cargo package, Cargo can use git to guide its decision on which files to include. Previously this git-based logic required a Cargo.toml file to exist at the root of the repository. This is no longer required, so Cargo will now use git-based guidance even if there is not a Cargo.toml in the root of the repository. #8095

• While unpacking a crate on Windows, if it fails to write a file because the file is a reserved Windows filename (like "aux.rs"), Cargo will display an extra message to explain why it failed. #8136

• Failures to set mtime on files are now ignored. Some filesystems did not support this. #8185

• Certain classes of git errors will now recommend enabling net.git-fetch-with-cli. #8166

• When doing an LTO build, Cargo will now instruct rustc not to perform codegen when possible. This may result in a faster build and use less disk space. Additionally, for non-LTO builds, Cargo will instruct rustc to not embed LLVM bitcode in libraries, which should decrease their size. #8192 #8226 #8254

• The implementation for cargo clean -p has been rewritten so that it can more accurately remove the files for a specific package. #8210

• The way Cargo computes the outputs from a build has been rewritten to be more complete and accurate. Newly tracked files will be displayed in JSON messages, and may be uplifted to the output directory in some cases. Some of the changes from this are:

  • .exp export files on Windows MSVC dynamic libraries are now tracked.
  • Proc-macros on Windows track import/export files.
  • All targets (like tests, etc.) that generate separate debug files (pdb/dSYM) are tracked.
  • Added .map files for wasm32-unknown-emscripten.
  • macOS dSYM directories are tracked for all dynamic libraries (dylib/cdylib/proc-macro) and for build scripts.

  There are a variety of other changes as a consequence of this:

  • Binary examples on Windows MSVC with a hyphen will now show up twice in the examples directory (foo_bar.exe and foo-bar.exe). Previously Cargo just renamed the file instead of hard-linking it.
  • Example libraries now follow the same rules for hyphen/underscore translation as normal libs (they will now use underscores).

  #8210

• Cargo attempts to scrub any secrets from the debug log for HTTP debugging. #8222

• Context has been added to many of Cargo's filesystem operations, so that error messages now provide more information, such as the path that caused the problem. #8232

• Several commands now ignore the error if stdout or stderr is closed while it is running. For example cargo install --list | grep -q cargo-fuzz would previously sometimes panic because grep -q may close stdout before the command finishes. Regular builds continue to fail if stdout or stderr is closed, matching the behavior of many other build systems. #8236

• If cargo install is given an exact version, like --version=1.2.3, it will now avoid updating the index if that version is already installed, and exit quickly indicating it is already installed. #8022

• Changes to the [patch] section will now attempt to automatically update Cargo.lock to the new version. It should now also provide better error messages for the rare cases where it is unable to automatically update. #8248

Fixed

• Fixed copying Windows .pdb files to the output directory when the filename contained dashes. #8123
• Fixed error where Cargo would fail when scanning if a package is inside a git repository when any of its ancestor paths is a symlink. #8186
• Fixed cargo update with an unused [patch] so that it does not get stuck and refuse to update. #8243
• Fixed a situation where Cargo would hang if stderr is closed, and the compiler generated a large number of messages. #8247
• Fixed backtraces on macOS not showing filenames or line numbers. As a consequence of this, binary executables on apple targets do not include a hash in the filename in Cargo's cache. This means Cargo can only track one copy, so if you switch features or rustc versions, Cargo will need to rebuild the executable. #8329 #8335
• Fixed fingerprinting when using lld on Windows with a dylib. Cargo was erroneously thinking the dylib was never fresh. #8290 #8335

Nightly only

• Fixed passing the full path for --target to rustdoc when using JSON spec targets. #8094
• -Cembed-bitcode=no renamed to -Cbitcode-in-rlib=no #8134
• Added new resolver field to Cargo.toml to opt-in to the new feature resolver. #8129
• -Zbuild-std no longer treats std dependencies as "local". This means that it won't use incremental compilation for those dependencies, removes them from dep-info files, and caps lints at "allow". #8177
• Added -Zmultitarget which allows multiple --target flags to build the same thing for multiple targets at once. docs #8167
• Added strip option to the profile to remove symbols and debug information. docs #8246
• Fixed panic with cargo tree --target=all -Zfeatures=all. #8269

Cargo 1.44 (2020-06-04)

bda50510...rust-1.44.0

Added

• 🔥 Added the cargo tree command. docs #8062
• Added warnings if a package has Windows-restricted filenames (like nul, con, aux, prn, etc.). #7959
• Added a "build-finished" JSON message when compilation is complete so that tools can detect when they can stop listening for JSON messages with commands like cargo run or cargo test. #8069

Changed

• Valid package names are now restricted to Unicode XID identifiers. This is mostly the same as before, except package names cannot start with a number or -. #7959
• cargo new and init will warn or reject additional package names (reserved Windows names, reserved Cargo directories, non-ASCII names, conflicting std names like core, etc.). #7959
• Tests are no longer hard-linked into the output directory (target/debug/). This ensures tools will have access to debug symbols and execute tests in the same way as Cargo. Tools should use JSON messages to discover the path to the executable. #7965
• Updating git submodules now displays an "Updating" message for each submodule. #7989
• File modification times are now preserved when extracting a .crate file. This reverses the change made in 1.40 where the mtime was not preserved. #7935
• Build script warnings are now displayed separately when the build script fails. #8017
• Removed the git-checkout subcommand. #8040
• The progress bar is now enabled for all unix platforms. Previously it was only Linux, macOS, and FreeBSD. #8054
• Artifacts generated by pre-release versions of rustc now share the same filenames. This means that changing nightly versions will not leave stale files in the build directory. #8073
• Invalid package names are rejected when using renamed dependencies. #8090
• Added a certain class of HTTP2 errors as "spurious" that will get retried. #8102
• Allow cargo package --list to succeed, even if there are other validation errors (such as Cargo.lock generation problem, or missing dependencies). #8175 #8215

Fixed

• Cargo no longer buffers excessive amounts of compiler output in memory. #7838
• Symbolic links in git repositories now work on Windows. #7996
• Fixed an issue where profile.dev was not loaded from a config file with cargo test when the dev profile was not defined in Cargo.toml. #8012
• When a binary is built as an implicit dependency of an integration test, it now checks dep_name/feature_name syntax in required-features correctly. #8020
• Fixed an issue where Cargo would not detect that an executable (such as an integration test) needs to be rebuilt when the previous build was interrupted with Ctrl-C. #8087
• Protect against some (unknown) situations where Cargo could panic when the system monotonic clock doesn't appear to be monotonic. #8114
• Fixed panic with cargo clean -p if the package has a build script. #8216

Nightly only

• Fixed panic with new feature resolver and required-features. #7962
• Added RUSTC_WORKSPACE_WRAPPER environment variable, which provides a way to wrap rustc for workspace members only, and affects the filename hash so that artifacts produced by the wrapper are cached separately. This usage can be seen on nightly clippy with cargo clippy -Zunstable-options. #7533
• Added --unit-graph CLI option to display Cargo's internal dependency graph as JSON. #7977
• Changed -Zbuild_dep to -Zhost_dep, and added proc-macros to the feature decoupling logic. #8003 #8028
• Fixed so that --crate-version is not automatically passed when the flag is found in RUSTDOCFLAGS. #8014
• Fixed panic with -Zfeatures=dev_dep and check --profile=test. #8027
• Fixed panic with -Zfeatures=itarget with certain host dependencies. #8048
• Added support for -Cembed-bitcode=no, which provides a performance boost and disk-space usage reduction for non-LTO builds. #8066
• -Zpackage-features has been extended with several changes intended to make it easier to select features on the command-line in a workspace. #8074

Cargo 1.43 (2020-04-23)

9d32b7b0...rust-1.43.0

Added

• 🔥 Profiles may now be specified in config files (and environment variables). docs #7823
• ❗ Added CARGO_BIN_EXE_<name> environment variable when building integration tests. This variable contains the path to any [[bin]] targets in the package. Integration tests should use the env! macro to determine the path to a binary to execute. docs #7697

Changed

• cargo install --git now honors workspaces in a git repository. This allows workspace settings, like [patch], [replace], or [profile] to be used. #7768
• cargo new will now run rustfmt on the new files to pick up rustfmt settings like tab_spaces so that the new file matches the user's preferred indentation settings. #7827
• Environment variables printed with "very verbose" output (-vv) are now consistently sorted. #7877
• Debug logging for fingerprint rebuild-detection now includes more information. #7888 #7890 #7952
• Added warning during publish if the license-file doesn't exist. #7905
• The license-file file is automatically included during publish, even if it is not explicitly listed in the include list or is in a location outside of the root of the package. #7905
• CARGO_CFG_DEBUG_ASSERTIONS and CARGO_CFG_PROC_MACRO are no longer set when running a build script. These were inadvertently set in the past, but had no meaning as they were always true. Additionally, cfg(proc-macro) is no longer supported in a target expression. #7943 #7970

Fixed

• Global command-line flags now work with aliases (like cargo -v b). #7837
• Required-features using dependency syntax (like renamed_dep/feat_name) now handle renamed dependencies correctly. #7855
• Fixed a rare situation where if a build script is run multiple times during the same build, Cargo will now keep the results separate instead of losing the output of the first execution. #7857
• Fixed incorrect interpretation of environment variable CARGO_TARGET_*_RUNNER=true as a boolean. Also improved related env var error messages. #7891
• Updated internal libgit2 library, bringing various fixes to git support. #7939
• cargo package / cargo publish should no longer buffer the entire contents of each file in memory. #7946
• Ignore more invalid Cargo.toml files in a git dependency. Cargo currently walks the entire repo to find the requested package. Certain invalid manifests were already skipped, and now it should skip all of them. #7947

Nightly only

• Added build.out-dir config variable to set the output directory. #7810
• Added -Zjobserver-per-rustc feature to support improved performance for parallel rustc. #7731
• Fixed filename collision with build-std and crates like cc. #7860
• -Ztimings will now save its report even if there is an error. #7872
• Updated --config command-line flag to support taking a path to a config file to load. #7901
• Added new feature resolver. #7820
• Rustdoc docs now automatically include the version of the package in the side bar (requires -Z crate-versions flag). #7903

Cargo 1.42 (2020-03-12)

0bf7aafe...rust-1.42.0

Added

• Added documentation on git authentication. #7658
• Bitbucket Pipeline badges are now supported on crates.io. #7663
• cargo vendor now accepts the --versioned-dirs option to force it to always include the version number in each package's directory name. #7631
• The proc_macro crate is now automatically added to the extern prelude for proc-macro packages. This means that extern crate proc_macro; is no longer necessary for proc-macros. #7700

Changed

• Emit a warning if debug_assertions, test, proc_macro, or feature= is used in a cfg() expression. #7660
• Large update to the Cargo documentation, adding new chapters on Cargo targets, workspaces, and features. #7733
• Windows: .lib DLL import libraries are now copied next to the dll for all Windows MSVC targets. Previously it was only supported for pc-windows-msvc. This adds DLL support for uwp-windows-msvc targets. #7758
• The ar field in the [target] configuration is no longer read. It has been ignored for over 4 years. #7763
• Bash completion file simplified and updated for latest changes. #7789
• Credentials are only loaded when needed, instead of every Cargo command. #7774

Fixed

• Removed --offline empty index check, which was a false positive in some cases. #7655
• Files and directories starting with a . can now be included in a package by adding it to the include list. #7680
• Fixed cargo login removing alternative registry tokens when previous entries existed in the credentials file. #7708
• Fixed cargo vendor from panicking when used with alternative registries. #7718
• Fixed incorrect explanation in the fingerprint debug log message. #7749
• A [source] that is defined multiple times will now result in an error. Previously it was randomly picking a source, which could cause non-deterministic behavior. #7751
• dep_kinds in cargo metadata are now de-duplicated. #7756
• Fixed packaging where Cargo.lock was listed in .gitignore in a subdirectory inside a git repository. Previously it was assuming Cargo.lock was at the root of the repo. #7779
• Partial file transfer errors will now cause an automatic retry. #7788
• Linux: Fixed panic if CPU iowait stat decreases. #7803
• Fixed using the wrong sysroot for detecting host compiler settings when --sysroot is passed in via RUSTFLAGS. #7798

Nightly only

• build-std now uses --extern instead of --sysroot to find sysroot packages. #7699
• Added --config command-line option to set config settings. #7649
• Added include config setting which allows including another config file. #7649
• Profiles in config files now support any named profile. Previously it was limited to dev/release. #7750

Cargo 1.41 (2020-01-30)

5da4b4d4...rust-1.41.0

Added

• 🔥 Cargo now uses a new Cargo.lock file format. This new format should support easier merges in source control systems. Projects using the old format will continue to use the old format, only new Cargo.lock files will use the new format. #7579
• 🔥 cargo install will now upgrade already installed packages instead of failing. #7560
• 🔥 Profile overrides have been added. This allows overriding profiles for individual dependencies or build scripts. See the documentation for more. #7591
• Added new documentation for build scripts. #7565
• Added documentation for Cargo's JSON output. #7595
• Significant expansion of config and environment variable documentation. #7650
• Add back support for BROWSER environment variable for cargo doc --open. #7576
• Added kind and platform for dependencies in cargo metadata. #7132
• The OUT_DIR value is now included in the build-script-executed JSON message. #7622

Changed

• cargo doc will now document private items in binaries by default. #7593
• Subcommand typo suggestions now include aliases. #7486
• Tweak how the "already existing..." comment is added to .gitignore. #7570
• Ignore cargo login text from copy/paste in token. #7588
• Windows: Ignore errors for locking files when not supported by the filesystem. #7602
• Remove **/*.rs.bk from .gitignore. #7647

Fixed

• Fix unused warnings for some keys in the build config section. #7575
• Linux: Don't panic when parsing /proc/stat. #7580
• Don't show canonical path in cargo vendor. #7629

Nightly only

Cargo 1.40 (2019-12-19)

1c6ec66d...5da4b4d4

Added

• Added http.ssl-version config option to control the version of TLS, along with min/max versions. #7308
• 🔥 Compiler warnings are now cached on disk. If a build generates warnings, re-running the build will now re-display the warnings. #7450
• Added --filter-platform option to cargo metadata to narrow the nodes shown in the resolver graph to only packages included for the given target triple. #7376

Changed

• Cargo's "platform" cfg parsing has been extracted into a separate crate named cargo-platform. #7375
• Dependencies extracted into Cargo's cache no longer preserve mtimes to reduce syscall overhead. #7465
• Windows: EXE files no longer include a metadata hash in the filename. This helps with debuggers correlating the filename with the PDB file. #7400
• Wasm32: .wasm files are no longer treated as an "executable", allowing cargo test and cargo run to work properly with the generated .js file. #7476
• crates.io now supports SPDX 3.6 licenses. #7481
• Improved cyclic dependency error message. #7470
• Bare cargo clean no longer locks the package cache. #7502
• cargo publish now allows dev-dependencies without a version key to be published. A git or path-only dev-dependency will be removed from the package manifest before uploading. #7333
• --features and --no-default-features in the root of a virtual workspace will now generate an error instead of being ignored. #7507
• Generated files (like Cargo.toml and Cargo.lock) in a package archive now have their timestamp set to the current time instead of the epoch. #7523
• The -Z flag parser is now more strict, rejecting more invalid syntax. #7531

Fixed

• Fixed an issue where if a package had an include field, and Cargo.lock in .gitignore, and a binary or example target, and the Cargo.lock exists in the current project, it would fail to publish complaining the Cargo.lock was dirty. #7448
• Fixed a panic in a particular combination of [patch] entries. #7452
• Windows: Better error message when cargo test or rustc crashes in an abnormal way, such as a signal or seg fault. #7535

Nightly only

• The mtime-on-use feature may now be enabled via the unstable.mtime_on_use config option. #7411
• Added support for named profiles. #6989
• Added -Zpanic-abort-tests to allow building and running tests with the "abort" panic strategy. #7460
• Changed build-std to use --sysroot. #7421
• Various fixes and enhancements to -Ztimings. #7395 #7398 #7397 #7403 #7428 #7429
• Profile overrides have renamed the syntax to be [profile.dev.package.NAME]. #7504
• Fixed warnings for unused profile overrides in a workspace. #7536

Cargo 1.39 (2019-11-07)

e853aa97...1c6ec66d

Added

• Config files may now use the .toml filename extension. #7295
• The --workspace flag has been added as an alias for --all to help avoid confusion about the meaning of "all". #7241
• The publish field has been added to cargo metadata. #7354

Changed

• Display more information if parsing the output from rustc fails. #7236
• TOML errors now show the column number. #7248
• cargo vendor no longer deletes files in the vendor directory that starts with a .. #7242
• cargo fetch will now show manifest warnings. #7243
• cargo publish will now check git submodules if they contain any uncommitted changes. #7245
• In a build script, cargo:rustc-flags now allows -l and -L flags without spaces. #7257
• When cargo install replaces an older version of a package it will now delete any installed binaries that are no longer present in the newly installed version. #7246
• A git dependency may now also specify a version key when published. The git value will be stripped from the uploaded crate, matching the behavior of path dependencies. #7237
• The behavior of workspace default-members has changed. The default-members now only applies when running Cargo in the root of the workspace. Previously it would always apply regardless of which directory Cargo is running in. #7270
• libgit2 updated pulling in all upstream changes. #7275
• Bump home dependency for locating home directories. #7277
• zsh completions have been updated. #7296
• SSL connect errors are now retried. #7318
• The jobserver has been changed to acquire N tokens (instead of N-1), and then immediately acquires the extra token. This was changed to accommodate the cc crate on Windows to allow it to release its implicit token. #7344
• The scheduling algorithm for choosing which crate to build next has been changed. It now chooses the crate with the greatest number of transitive crates waiting on it. Previously it used a maximum topological depth. #7390
• RUSTFLAGS are no longer incorporated in the metadata and filename hash, reversing the change from 1.33 that added it. This means that any change to RUSTFLAGS will cause a recompile, and will not affect symbol munging. #7459

Fixed

• Git dependencies with submodules with shorthand SSH URLs (like [email protected]/user/repo.git) should now work. #7238
• Handle broken symlinks when creating .dSYM symlinks on macOS. #7268
• Fixed issues with multiple versions of the same crate in a [patch] table. #7303
• Fixed issue with custom target .json files where a substring of the name matches an unsupported crate type (like "bin"). #7363
• Fixed issues with generating documentation for proc-macro crate types. #7159
• Fixed hang if Cargo panics within a build thread. #7366
• Fixed rebuild detection if a build.rs script issues different rerun-if directives between builds. Cargo was erroneously causing a rebuild after the change. #7373
• Properly handle canonical URLs for [patch] table entries, preventing the patch from working after the first time it is used. #7368
• Fixed an issue where integration tests were waiting for the package binary to finish building before starting their own build. They now may build concurrently. #7394
• Fixed accidental change in the previous release on how --features a b flag is interpreted, restoring the original behavior where this is interpreted as --features a along with the argument b passed to the command. To pass multiple features, use quotes around the features to pass multiple features like --features "a b", or use commas, or use multiple --features flags. #7419

Nightly only

• Basic support for building the standard library directly from Cargo has been added. (docs) #7216
• Added -Ztimings feature to generate an HTML report on the time spent on individual compilation steps. This also may output completion steps on the console and JSON data. (docs) #7311
• Added ability to cross-compile doctests. (docs) #6892

Cargo 1.38 (2019-09-26)

4c1fa54d...23ef9a4e

Added

• 🔥 Cargo build pipelining has been enabled by default to leverage more idle CPU parallelism during builds. #7143
• The --message-format option to Cargo can now be specified multiple times and accepts a comma-separated list of values. In addition to the previous values it also now accepts json-diagnostic-short and json-diagnostic-rendered-ansi which configures the output coming from rustc in json message mode. #7214
• Cirrus CI badges are now supported on crates.io. #7119
• A new format for Cargo.lock has been introduced. This new format is intended to avoid source-control merge conflicts more often, and to generally make it safer to merge changes. This new format is not enabled at this time, though Cargo will use it if it sees it. At some point in the future, it is intended that this will become the default. #7070
• Progress bar support added for FreeBSD. #7222

Changed

• The -q flag will no longer suppress the root error message for an error from Cargo itself. #7116
• The Cargo Book is now published with mdbook 0.3 providing a number of formatting fixes and improvements. #7140
• The --features command-line flag can now be specified multiple times. The list of features from all the flags are joined together. #7084
• Package include/exclude glob-vs-gitignore warnings have been removed. Packages may now use gitignore-style matching without producing any warnings. #7170
• Cargo now shows the command and output when parsing rustc output fails when querying rustc for information like cfg values. #7185
• cargo package/cargo publish now allows a symbolic link to a git submodule to include that submodule. #6817
• Improved the error message when a version requirement does not match any versions, but there are pre-release versions available. #7191

Fixed

• Fixed using the wrong directory when updating git repositories when using the git-fetch-with-cli config option, and the GIT_DIR environment variable is set. This may happen when running cargo from git callbacks. #7082
• Fixed dep-info files being overwritten for targets that have separate debug outputs. For example, binaries on -apple- targets with .dSYM directories would overwrite the .d file. #7057
• Fix [patch] table not preserving "one major version per source" rule. #7118
• Ignore --remap-path-prefix flags for the metadata hash in the cargo rustc command. This was causing the remap settings to inadvertently affect symbol names. #7134
• Fixed cycle detection in [patch] dependencies. #7174
• Fixed cargo new leaving behind a symlink on Windows when core.symlinks git config is true. Also adds a number of fixes and updates from upstream libgit2. #7176
• macOS: Fixed setting the flag to mark the target directory to be excluded from backups. #7192
• Fixed cargo fix panicking under some situations involving multi-byte characters. #7221

Nightly only

• Added cargo fix --clippy which will apply machine-applicable fixes from Clippy. #7069
• Added -Z binary-dep-depinfo flag to add change tracking for binary dependencies like the standard library. #7137 #7219
• cargo clippy-preview will always run, even if no changes have been made. #7157
• Fixed exponential blowup when using CARGO_BUILD_PIPELINING. #7062
• Fixed passing args to clippy in cargo clippy-preview. #7162

Cargo 1.37 (2019-08-15)

c4fcfb72...9edd0891

Added

• Added doctest field to cargo metadata to determine if a target's documentation is tested. #6953 #6965
• 🔥 The cargo vendor command is now built-in to Cargo. This command may be used to create a local copy of the sources of all dependencies. #6869
• 🔥 The "publish lockfile" feature is now stable. This feature will automatically include the Cargo.lock file when a package is published if it contains a binary executable target. By default, Cargo will ignore Cargo.lock when installing a package. To force Cargo to use the Cargo.lock file included in the published package, use cargo install --locked. This may be useful to ensure that cargo install consistently reproduces the same result. It may also be useful when a semver-incompatible change is accidentally published to a dependency, providing a way to fall back to a version that is known to work. #7026
• 🔥 The default-run feature has been stabilized. This feature allows you to specify which binary executable to run by default with cargo run when a package includes multiple binaries. Set the default-run key in the [package] table in Cargo.toml to the name of the binary to use by default. #7056

Changed

• cargo package now verifies that build scripts do not create empty directories. #6973
• A warning is now issued if cargo doc generates duplicate outputs, which causes files to be randomly stomped on. This may happen for a variety of reasons (renamed dependencies, multiple versions of the same package, packages with renamed libraries, etc.). This is a known bug, which needs more work to handle correctly. #6998
• Enabling a dependency's feature with --features foo/bar will no longer compile the current crate with the foo feature if foo is not an optional dependency. #7010
• If --remap-path-prefix is passed via RUSTFLAGS, it will no longer affect the filename metadata hash. #6966
• libgit2 has been updated to 0.28.2, which Cargo uses to access git repositories. This brings in hundreds of changes and fixes since it was last updated in November. #7018
• Cargo now supports absolute paths in the dep-info files generated by rustc. This is laying the groundwork for tracking binaries, such as libstd, for rebuild detection. (Note: this contains a known bug.) #7030

Fixed

• Fixed how zsh completions fetch the list of commands. #6956
• "+ debuginfo" is no longer printed in the build summary when debug is set to 0. #6971
• Fixed cargo doc with an example configured with doc = true to document correctly. #7023
• Don't fail if a read-only lock cannot be acquired in CARGO_HOME. This helps when CARGO_HOME doesn't exist, but --locked is used which means CARGO_HOME is not needed. #7149
• Reverted a change in 1.35 which released jobserver tokens when Cargo blocked on a lock file. It caused a deadlock in some situations. #7204

Nightly only

• Added compiler message caching. The -Z cache-messages flag makes cargo cache the compiler output so that future runs can redisplay previous warnings. #6933
• -Z mtime-on-use no longer touches intermediate artifacts. #7050

Cargo 1.36 (2019-07-04)

6f3e9c36...c4fcfb72

Added

• Added more detailed documentation on target auto-discovery. #6898
• 🔥 Stabilize the --offline flag which allows using cargo without a network connection. #6934 #6871

Changed

• publish = ["crates-io"] may be added to the manifest to restrict publishing to crates.io only. #6838
• macOS: Only include the default paths if DYLD_FALLBACK_LIBRARY_PATH is not set. Also, remove /lib from the default set. #6856
• cargo publish will now exit early if the login token is not available. #6854
• HTTP/2 stream errors are now considered "spurious" and will cause a retry. #6861
• Setting a feature on a dependency where that feature points to a required dependency is now an error. Previously it was a warning. #6860
• The registry.index config value now supports relative file: URLs. #6873
• macOS: The .dSYM directory is now symbolically linked next to example binaries without the metadata hash so that debuggers can find it. #6891
• The default Cargo.toml template for now projects now includes a comment providing a link to the documentation. #6881
• Some improvements to the wording of the crate download summary. #6916 #6920
• ✨ Changed RUST_LOG environment variable to CARGO_LOG so that user code that uses the log crate will not display cargo's debug output. #6918
• Cargo.toml is now always included when packaging, even if it is not listed in package.include. #6925
• Package include/exclude values now use gitignore patterns instead of glob patterns. #6924
• Provide a better error message when crates.io times out. Also improve error messages with other HTTP response codes. #6936

Performance

• Resolver performance improvements for some cases. #6853
• Optimized how cargo reads the index JSON files by caching the results. #6880 #6912 #6940
• Various performance improvements. #6867

Fixed

• More carefully track the on-disk fingerprint information for dependencies. This can help in some rare cases where the build is interrupted and restarted. #6832
• cargo run now correctly passes non-UTF8 arguments to the child process. #6849
• Fixed bash completion to run on bash 3.2, the stock version in macOS. #6905
• Various fixes and improvements to zsh completion. #6926 #6929
• Fix cargo update ignoring -p arguments if the Cargo.lock file was missing. #6904

Nightly only

• Added -Z install-upgrade feature to track details about installed crates and to update them if they are out-of-date. #6798
• Added the public-dependency feature which allows tracking public versus private dependencies. #6772
• Added build pipelining via the build.pipelining config option (CARGO_BUILD_PIPELINING env var). #6883
• The publish-lockfile feature has had some significant changes. The default is now true, the Cargo.lock will always be published for binary crates. The Cargo.lock is now regenerated during publishing. cargo install now ignores the Cargo.lock file by default, and requires --locked to use the lock file. Warnings have been added if yanked dependencies are detected. #6840

Cargo 1.35 (2019-05-23)

6789d8a0...6f3e9c36

Added

• Added the rustc-cdylib-link-arg key for build scripts to specify linker arguments for cdylib crates. #6298

Changed

• When passing a test filter, such as cargo test foo, don't build examples (unless they set test = true). #6683
• Forward the --quiet flag from cargo test to the libtest harness so that tests are actually quiet. #6358
• The verification step in cargo package that checks if any files are modified is now stricter. It uses a hash of the contents instead of checking filesystem mtimes. It also checks all files in the package. #6740
• Jobserver tokens are now released whenever Cargo blocks on a file lock. #6748
• Issue a warning for a previous bug in the TOML parser that allowed multiple table headers with the same name. #6761
• Removed the CARGO_PKG_* environment variables from the metadata hash and added them to the fingerprint instead. This means that when these values change, stale artifacts are not left behind. Also added the "repository" value to the fingerprint. #6785
• cargo metadata no longer shows a null field for a dependency without a library in resolve.nodes.deps. The dependency is no longer shown. #6534
• cargo new will no longer include an email address in the authors field if it is set to the empty string. #6802
• cargo doc --open now works when documenting multiple packages. #6803
• cargo install --path P now loads the .cargo/config file from the directory P. #6805
• Using semver metadata in a version requirement (such as 1.0.0+1234) now issues a warning that it is ignored. #6806
• cargo install now rejects certain combinations of flags where some flags would have been ignored. #6801
• Resolver performance improvements for some cases. #6776

Fixed

• Fixed running separate commands (such as cargo build then cargo test) where the second command could use stale results from a build script. #6720
• Fixed cargo fix not working properly if a .gitignore file that matched the root package directory. #6767
• Fixed accidentally compiling a lib multiple times if panic=unwind was set in a profile. #6781
• Paths to JSON files in build.target config value are now canonicalized to fix building dependencies. #6778
• Fixed re-running a build script if its compilation was interrupted (such as if it is killed). #6782
• Fixed cargo new initializing a fossil repo. #6792
• Fixed supporting updating a git repo that has a force push when using the git-fetch-with-cli feature. git-fetch-with-cli also shows more error information now when it fails. #6800
• --example binaries built for the WASM target are fixed to no longer include a metadata hash in the filename, and are correctly emitted in the compiler-artifact JSON message. #6812

Nightly only

• cargo clippy-preview is now a built-in cargo command. #6759
• The build-override profile setting now includes proc-macros and their dependencies. #6811
• Optional and target dependencies now work better with -Z offline. #6814

Cargo 1.34 (2019-04-11)

f099fe94...6789d8a0

Added

• 🔥 Stabilized support for alternate registries. #6654
• Added documentation on using builds.sr.ht Continuous Integration with Cargo. #6565
• Cargo.lock now includes a comment at the top that it is @generated. #6548
• Azure DevOps badges are now supported. #6264
• Added a warning if --exclude flag specifies an unknown package. #6679

Changed

• cargo test --doc --no-run doesn't do anything, so it now displays an error to that effect. #6628
• Various updates to bash completion: add missing options and commands, support libtest completions, use rustup for --target completion, fallback to filename completion, fix editing the command line. #6644
• Publishing a crate with a [patch] section no longer generates an error. The [patch] section is removed from the manifest before publishing. #6535
• build.incremental = true config value is now treated the same as CARGO_INCREMENTAL=1, previously it was ignored. #6688
• Errors from a registry are now always displayed regardless of the HTTP response code. #6771

Fixed

• Fixed bash completion for cargo run --example. #6578
• Fixed a race condition when using a local registry and running multiple cargo commands at the same time that build the same crate. #6591
• Fixed some flickering and excessive updates of the progress bar. #6615
• Fixed a hang when using a git credential helper that returns incorrect credentials. #6681
• Fixed resolving yanked crates with a local registry. #6750

Nightly only

• Added -Z mtime-on-use flag to cause the mtime to be updated on the filesystem when a crate is used. This is intended to be able to track stale artifacts in the future for cleaning up unused files. #6477 #6573
• Added experimental -Z dual-proc-macros to build proc macros for both the host and the target. #6547

Cargo 1.33 (2019-02-28)

8610973a...f099fe94

Added

• compiler-artifact JSON messages now include an "executable" key which includes the path to the executable that was built. #6363
• The man pages have been rewritten, and are now published with the web documentation. #6405
• cargo login now displays a confirmation after saving the token. #6466
• A warning is now emitted if a [patch] entry does not match any package. #6470
• cargo metadata now includes the links key for a package. #6480
• "Very verbose" output with -vv now displays the environment variables that cargo sets when it runs a process. #6492
• --example, --bin, --bench, or --test without an argument now lists the available targets for those options. #6505
• Windows: If a process fails with an extended status exit code, a human-readable name for the code is now displayed. #6532
• Added --features, --no-default-features, and --all-features flags to the cargo package and cargo publish commands to use the given features when verifying the package. #6453

Changed

• If cargo fix fails to compile the fixed code, the rustc errors are now displayed on the console. #6419
• Hide the --host flag from cargo login, it is unused. #6466
• Build script fingerprints now include the rustc version. #6473
• macOS: Switched to setting DYLD_FALLBACK_LIBRARY_PATH instead of DYLD_LIBRARY_PATH. #6355
• RUSTFLAGS is now included in the metadata hash, meaning that changing the flags will not overwrite previously built files. #6503
• When updating the crate graph, unrelated yanked crates were erroneously removed. They are now kept at their original version if possible. This was causing unrelated packages to be downgraded during cargo update -p somecrate. #5702
• TOML files now support the 0.5 TOML syntax.

Fixed

• cargo fix will now ignore suggestions that modify multiple files. #6402
• cargo fix will now only fix one target at a time, to deal with targets which share the same source files. #6434
• Fixed bash completion showing the list of cargo commands. #6461
• cargo init will now avoid creating duplicate entries in .gitignore files. #6521
• Builds now attempt to detect if a file is modified in the middle of a compilation, allowing you to build again and pick up the new changes. This is done by keeping track of when the compilation starts not when it finishes. Also, #5919 was reverted, meaning that cargo does not treat equal filesystem mtimes as requiring a rebuild. #6484

Nightly only

• Allow using registry names in [patch] tables instead of just URLs. #6456
• cargo metadata added the registry key for dependencies. #6500
• Registry names are now restricted to the same style as package names (alphanumeric, - and _ characters). #6469
• cargo login now displays the /me URL from the registry config. #6466
• cargo login --registry=NAME now supports interactive input for the token. #6466
• Registries may now elide the api key from config.json to indicate they do not support API access. #6466
• Fixed panic when using --message-format=json with metabuild. #6432
• Fixed detection of publishing to crates.io when using alternate registries. #6525

Cargo 1.32 (2019-01-17)

339d9f9c...8610973a

Added

• Registries may now display warnings after a successful publish. #6303
• Added a glossary to the documentation. #6321
• Added the alias c for cargo check. #6218

Changed

• 🔥 HTTP/2 multiplexing is now enabled by default. The http.multiplexing config value may be used to disable it. #6271
• Use ANSI escape sequences to clear lines instead of spaces. #6233
• Disable git templates when checking out git dependencies, which can cause problems. #6252
• Include the --update-head-ok git flag when using the net.git-fetch-with-cli option. This can help prevent failures when fetching some repositories. #6250
• When extracting a crate during the verification step of cargo package, the filesystem mtimes are no longer set, which was failing on some rare filesystems. #6257
• crate-type = ["proc-macro"] is now treated the same as proc-macro = true in Cargo.toml. #6256
• An error is raised if dependencies, features, target, or badges is set in a virtual workspace. Warnings are displayed if replace or patch is used in a workspace member. #6276
• Improved performance of the resolver in some cases. #6283 #6366
• .rmeta files are no longer hard-linked into the base target directory (target/debug). #6292
• A warning is issued if multiple targets are built with the same output filenames. #6308
• When using cargo build (without --release) benchmarks are now built using the "test" profile instead of "bench". This makes it easier to debug benchmarks, and avoids confusing behavior. #6309
• User aliases may now override built-in aliases (b, r, t, and c). #6259
• Setting autobins=false now disables auto-discovery of inferred targets. #6329
• cargo verify-project will now fail on stable if the project uses unstable features. #6326
• Platform targets with an internal . within the name are now allowed. #6255
• cargo clean --release now only deletes the release directory. #6349

Fixed

• Avoid adding extra angle brackets in email address for cargo new. #6243
• The progress bar is disabled if the CI environment variable is set. #6281
• Avoid retaining all rustc output in memory. #6289
• If JSON parsing fails, and rustc exits nonzero, don't lose the parse failure message. #6290
• Fixed renaming a project directory with build scripts. #6328
• Fixed cargo run --example NAME to work correctly if the example sets crate_type = ["bin"]. #6330
• Fixed issue with cargo package git discovery being too aggressive. The --allow-dirty now completely disables the git repo checks. #6280
• Fixed build change tracking for [patch] deps which resulted in cargo build rebuilding when it shouldn't. #6493

Nightly only

• Allow usernames in registry URLs. #6242
• Added "compile_mode" key to the build-plan JSON structure to be able to distinguish running a custom build script versus compiling the build script. #6331
• --out-dir no longer copies over build scripts. #6300

Cargo 1.31 (2018-12-06)

36d96825...339d9f9c

Added

• 🔥 Stabilized support for the 2018 edition. #5984 #5989
• 🔥 Added the ability to rename dependencies in Cargo.toml. #6319
• 🔥 Added support for HTTP/2 pipelining and multiplexing. Set the http.multiplexing config value to enable. #6005
• Added http.debug configuration value to debug HTTP connections. Use CARGO_HTTP_DEBUG=true RUST_LOG=cargo::ops::registry cargo build to display the debug information. #6166
• CARGO_PKG_REPOSITORY environment variable is set with the repository value from Cargo.toml when building . #6096

Changed

• cargo test --doc now rejects other flags instead of ignoring them. #6037
• cargo install ignores ~/.cargo/config. #6026
• cargo version --verbose is now the same as cargo -vV. #6076
• Comments at the top of Cargo.lock are now preserved. #6181
• When building in "very verbose" mode (cargo build -vv), build script output is prefixed with the package name and version, such as [foo 0.0.1]. #6164
• If cargo fix --broken-code fails to compile after fixes have been applied, the files are no longer reverted and are left in their broken state. #6316

Fixed

• Windows: Pass Ctrl-C to the process with cargo run. #6004
• macOS: Fix bash completion. #6038
• Support arbitrary toolchain names when completing +toolchain in bash completion. #6038
• Fixed edge cases in the resolver, when backtracking on failed dependencies. #5988
• Fixed cargo test --all-targets running lib tests three times. #6039
• Fixed publishing renamed dependencies to crates.io. #5993
• Fixed cargo install on a git repo with multiple binaries. #6060
• Fixed deeply nested JSON emitted by rustc being lost. #6081
• Windows: Fix locking msys terminals to 60 characters. #6122
• Fixed renamed dependencies with dashes. #6140
• Fixed linking against the wrong dylib when the dylib existed in both target/debug and target/debug/deps. #6167
• Fixed some unnecessary recompiles when panic=abort is used. #6170

Nightly only

• Added --registry flag to cargo install. #6128
• Added registry.default configuration value to specify the default registry to use if --registry flag is not passed. #6135
• Added --registry flag to cargo new and cargo init. #6135

Cargo 1.30 (2018-10-25)

524a578d...36d96825

Added

• 🔥 Added an animated progress bar shows progress during building. #5995
• Added resolve.nodes.deps key to cargo metadata, which includes more information about resolved dependencies, and properly handles renamed dependencies. #5871
• When creating a package, provide more detail with -v when failing to discover if files are dirty in a git repository. Also fix a problem with discovery on Windows. #5858
• Filters like --bin, --test, --example, --bench, or --lib can be used in a workspace without selecting a specific package. #5873
• cargo run can be used in a workspace without selecting a specific package. #5877
• cargo doc --message-format=json now outputs JSON messages from rustdoc. #5878
• Added --message-format=short to show one-line messages. #5879
• Added .cargo_vcs_info.json file to .crate packages that captures the current git hash. #5886
• Added net.git-fetch-with-cli configuration option to use the git executable to fetch repositories instead of using the built-in libgit2 library. #5914
• Added required-features to cargo metadata. #5902
• cargo uninstall within a package will now uninstall that package. #5927
• Added --allow-staged flag to cargo fix to allow it to run if files are staged in git. #5943
• Added net.low-speed-limit config value, and also honor net.timeout for http operations. #5957
• Added --edition flag to cargo new. #5984
• Temporarily stabilized 2018 edition support for the duration of the beta. #5984 #5989
• Added support for target.'cfg(…)'.runner config value to specify the run/test/bench runner for targets that use config expressions. #5959

Changed

• Windows: cargo run will not kill child processes when the main process exits. #5887
• Switched to the opener crate to open a web browser with cargo doc --open. This should more reliably select the system-preferred browser on all platforms. #5888
• Equal file mtimes now cause a target to be rebuilt. Previously only if files were strictly newer than the last build would it cause a rebuild. #5919
• Ignore build.target config value when running cargo install. #5874
• Ignore RUSTC_WRAPPER for cargo fix. #5983
• Ignore empty RUSTC_WRAPPER. #5985

Fixed

• Fixed error when creating a package with an edition field in Cargo.toml. #5908
• More consistently use relative paths for path dependencies in a workspace. #5935
• cargo fix now always runs, even if it was run previously. #5944
• Windows: Attempt to more reliably detect terminal width. msys-based terminals are forced to 60 characters wide. #6010
• Allow multiple target flags with cargo doc --document-private-items. 6022

Nightly only

• Added metabuild. #5628