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All rights reserved. +# Copyright 2019 Toyota Research Institute. All rights reserved. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +# This function is forked and modified from bazelbuild/rules_cc as of: +# https://github.com/bazelbuild/rules_cc/blob/262ebec3c2296296526740db4aefce68c80de7fa/cc/find_cc_toolchain.bzl +def find_cc_toolchain(ctx): + # Check the incompatible flag for toolchain resolution. + if hasattr(cc_common, "is_cc_toolchain_resolution_enabled_do_not_use") and cc_common.is_cc_toolchain_resolution_enabled_do_not_use(ctx = ctx): # noqa + if "//cc:toolchain_type" in ctx.toolchains: + return ctx.toolchains["//cc:toolchain_type"] + fail("In order to use find_cc_toolchain, your rule has to depend on C++ toolchain. See find_cc_toolchain.bzl docs for details.") # noqa + + # Fall back to the legacy implicit attribute lookup. + if hasattr(ctx.attr, "_cc_toolchain"): + return ctx.attr._cc_toolchain[cc_common.CcToolchainInfo] + + # We didn't find anything. + fail("In order to use find_cc_toolchain, your rule has to depend on C++ toolchain. See find_cc_toolchain.bzl docs for details.") # noqa + +# This variable is forked from bazelbuild/rules_cc as of: +# https://github.com/bazelbuild/rules_cc/blob/262ebec3c2296296526740db4aefce68c80de7fa/cc/action_names.bzl +CPP_LINK_STATIC_LIBRARY_ACTION_NAME = "c++-link-static-library" + +# This function is forked and modified from bazelbuild/rules_cc as of: +# https://github.com/bazelbuild/rules_cc/blob/262ebec3c2296296526740db4aefce68c80de7fa/examples/my_c_archive/my_c_archive.bzl +def _cc_whole_archive_library_impl(ctx): + # Find the C++ toolchain. + cc_toolchain = find_cc_toolchain(ctx) + feature_configuration = cc_common.configure_features( + ctx = ctx, + cc_toolchain = cc_toolchain, + requested_features = ctx.features, + unsupported_features = ctx.disabled_features, + ) + + # Iterate over the transitive list of libraries we want to link, adding + # `alwayslink = True` to each one. + deps_cc_infos = cc_common.merge_cc_infos( + cc_infos = [dep[CcInfo] for dep in ctx.attr.deps], + ) + old_libraries_to_link = deps_cc_infos.linking_context.libraries_to_link.to_list() # noqa + new_libraries_to_link = [] + for old_library_to_link in old_libraries_to_link: + new_library_to_link = cc_common.create_library_to_link( + actions = ctx.actions, + feature_configuration = feature_configuration, + cc_toolchain = cc_toolchain, + static_library = old_library_to_link.static_library, + pic_static_library = old_library_to_link.pic_static_library, + dynamic_library = old_library_to_link.resolved_symlink_dynamic_library, + interface_library = old_library_to_link.resolved_symlink_interface_library, + # This is where the magic happens! + alwayslink = True, + ) + new_libraries_to_link.append(new_library_to_link) + + # Return the CcInfo to pass along to code that wants to link us. + linking_context = cc_common.create_linking_context( + libraries_to_link = new_libraries_to_link, + user_link_flags = deps_cc_infos.linking_context.user_link_flags, + additional_inputs = deps_cc_infos.linking_context.additional_inputs.to_list(), # noqa + ) + return [ + DefaultInfo( + runfiles = ctx.runfiles( + collect_data = True, + collect_default = True, + ), + ), + CcInfo( + compilation_context = deps_cc_infos.compilation_context, + linking_context = linking_context, + ), + ] + +# Forked and modified from bazelbuild/rules_cc as of: +# https://github.com/bazelbuild/rules_cc/blob/262ebec3c2296296526740db4aefce68c80de7fa/examples/my_c_archive/my_c_archive.bzl +cc_whole_archive_library = rule( + implementation = _cc_whole_archive_library_impl, + attrs = { + "deps": attr.label_list(providers = [CcInfo]), + "_cc_toolchain": attr.label( + default = Label("@bazel_tools//tools/cpp:current_cc_toolchain"), + ), + }, + fragments = ["cpp"], + toolchains = ["@bazel_tools//tools/cpp:toolchain_type"], +) +"""Creates an cc_library with `alwayslink = True` added to all of its deps, to +work around https://github.com/bazelbuild/bazel/issues/7362 not providing any +useful way to create shared libraries from multiple cc_library targets unless +you want even statically-linked programs to keep all of their symbols. +""" diff --git a/tools/bazel.rc b/tools/bazel.rc index 64623a43eadb..495bd5c32411 100644 --- a/tools/bazel.rc +++ b/tools/bazel.rc @@ -7,10 +7,6 @@ import %workspace%/tools/lint/bazel.rc # than a toolchain in Bazel 0.27 and above until #11660 is resolved. build --incompatible_use_python_toolchains=false -# Continue to use --whole-archive for cc_binary rules that have linkshared = 1 -# and either linkstatic = 1 or -static in linkopts in Bazel 1.0 and above. -build --incompatible_remove_legacy_whole_archive=false - # Default to an optimized build. build -c opt diff --git a/tools/install/libdrake/BUILD.bazel b/tools/install/libdrake/BUILD.bazel index ea0574c6164e..88b94028f22f 100644 --- a/tools/install/libdrake/BUILD.bazel +++ b/tools/install/libdrake/BUILD.bazel @@ -16,7 +16,10 @@ load( ) load("//tools/lint:lint.bzl", "add_lint_tests") load(":build_components.bzl", "LIBDRAKE_COMPONENTS") -load("@drake//tools/skylark:drake_cc.bzl", "drake_cc_binary") +load( + "//third_party:com_github_bazelbuild_rules_cc/whole_archive.bzl", + "cc_whole_archive_library", +) # TODO(eric.cousineau): Try to make the CMake target `drake-marker` private, # such that no downstream users can use it? @@ -30,15 +33,23 @@ install_cmake_config( versioned = 0, ) -# The Drake binary package. libdrake.so contains all the symbols from all the -# LIBDRAKE_COMPONENTS and all the Drake externals. We use linkstatic=1 so -# that the binary package will not contain any references to shared libraries -# inside the build tree. -drake_cc_binary( +# Annotate all of the LIBDRAKE_COMPONENTS as `alwayslink = True`, so that we +# use the --whole-archive linker flag on them when creating libdrake.so +cc_whole_archive_library( + name = "libdrake_components_whole_archive", + deps = LIBDRAKE_COMPONENTS, +) + +# The Drake binary package libdrake.so contains all the symbols from all the +# LIBDRAKE_COMPONENTS plus the statically-linked Drake externals used by the +# LIBDRAKE_COMPONENTS. We use linkstatic=1 here so that the library will not +# contain any references to constituent shared libraries inside the build tree. +cc_binary( name = "libdrake.so", linkshared = 1, linkstatic = 1, - deps = LIBDRAKE_COMPONENTS + [ + deps = [ + ":libdrake_components_whole_archive", ":libdrake_runtime_so_deps", ], )