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LDC 1.22.0
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@kinke kinke released this 16 Jun 18:35
v1.22.0
74893d9
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(Changes since 1.22.0-beta2 are marked with (new).)

Big news

  • Frontend, druntime and Phobos are at version 2.092.1+. (#3413, #3416, #3429, #3434, #3452, #3467) (new)
  • AArch64: All known ABI issues have been fixed. C(++) interop should now be on par with x86_64, and variadics usable with core.{vararg,stdc.stdarg}. (#3421)
  • Windows hosts: DMD's Visual C++ toolchain detection has been adopted. As that's orders of magnitude faster than the previous method involving the MS batch file, auto-detection has been enabled by default, so if you have a non-ancient Visual C++ installation, it will now be used automatically for linking. The environment setup has been reduced to the bare minimum (LIB and PATH). (#3415)
  • FreeBSD x64: CI with CirrusCI is now fully green and includes automated prebuilt package generation. The package depends on the llvm ports package and should currently work on FreeBSD 11-13. (#3453, #3464) (new)
  • Link-time overridable @weak functions are now emulated for Windows targets and work properly for ELF platforms. For ELF, LDC doesn't emit any COMDATs anymore. (#3424)
  • New ldc.gccbuiltins_{amdgcn,nvvm} for AMD GCN and NVIDIA PTX targets. (#3411)
  • druntime: Significant speed-up for core.math.ldexp. (#3440, #3446)

Platform support

  • Supports LLVM 3.9 - 10.0.

Bug fixes

  • Cross-module inlining (incl. pragma(inline, true)): Enable emission into multiple object files. This may have a significant impact on performance (incl. druntime/Phobos) when not using LTO. (#3126, #3442)
  • Android: Fix TLS initialization regression (introduced in v1.21) and potential alignment issues. Unfortunately, the ld.bfd linker is required for our custom TLS emulation scheme, unless you're willing to use a custom linker script. So -linker=bfd is the new default for Android targets. (#3462) (new)
  • Casting (static and dynamic) arrays to vectors now loads the data instead of splatting the first element. (#3418, #3419)
  • Fix return statements potentially accessing memory from destructed temporaries. (#3426)
  • Add proper support for -checkaction=halt. (#3430, #3431)
  • druntime: Include core.stdcpp.* modules. (#3103, #3158)
  • GCC-style asm: Add support for indirect input operands ("m"). (#3438)
  • FreeBSD: Fix backtraces for optimized code by switching to external libexecinfo. (#3108, #3453)
  • FreeBSD: Fix C math related issues (incl. CTFE math issues) by bringing core.stdc.{math,tgmath} up to speed. (dlang/druntime#3119)
  • Fix ICE for captured parameters not passed on the LLVM level. (#3441)
  • Convenience fixes for RISC-V and other exotic targets. (#3457, #3460) (new)

Internals

  • When printing compile-time reals to hex strings (mangling, .di headers), LDC now uses LLVM instead of the host C runtime, for proper and consistent results. (#3410)
  • One limitation for exotic hosts wrt. C long double precision has been lifted. (#3414)
  • For AVR targets, the compiler now predefines AVR and emits all TLS globals as regular __gshared ones. (#3420)
  • WebAssembly: New memory grow/size intrinsics. (ldc-developers/druntime#187) (new)
  • New -fno-plt option to avoid PLT external calls. (#3443)
  • iOS/arm64 CI, running the debug druntime & Phobos unittests on an iPhone 6S. Thx Jacob for this tedious work! (#3379, #3450)

Known issues

  • When building LDC, old LDC 0.17.*/ltsmaster host compilers miscompile LDC ≥ 1.21, leading to potential segfaults of the built LDC. Ltsmaster can still be used to bootstrap a first compiler and then let that compiler compile itself. (#3354)
  • Buggy older ld.bfd linker versions may wrongly strip out required symbols, e.g., ModuleInfos (so that e.g. no module ctors/dtors are run). LDC defaults to ld.gold on Linux.
  • LDC does not zero the padding area of a real variable. This may lead to wrong results if the padding area is also considered. See #770. Does not apply to real members inside structs etc.
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