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| Original file line number | Diff line number | Diff line change |
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| """Provides a rule that outputs a monolithic static library.""" | ||
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| # Reference: https://gist.github.com/oquenchil/3f88a39876af2061f8aad6cdc9d7c045 | ||
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| load("@bazel_tools//tools/cpp:toolchain_utils.bzl", "find_cpp_toolchain") | ||
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| TOOLS_CPP_REPO = "@bazel_tools" | ||
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| def _cc_static_library_impl(ctx): | ||
| output_lib = ctx.actions.declare_file("{}.a".format(ctx.attr.name)) | ||
| output_flags = ctx.actions.declare_file("{}.link".format(ctx.attr.name)) | ||
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| cc_toolchain = find_cpp_toolchain(ctx) | ||
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| # Aggregate linker inputs of all dependencies | ||
| lib_sets = [] | ||
| for dep in ctx.attr.deps: | ||
| lib_sets.append(dep[CcInfo].linking_context.linker_inputs) | ||
| input_depset = depset(transitive = lib_sets) | ||
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| # Collect user link flags and make sure they are unique | ||
| unique_flags = {} | ||
| for inp in input_depset.to_list(): | ||
| unique_flags.update({ | ||
| flag: None | ||
| for flag in inp.user_link_flags | ||
| }) | ||
| link_flags = unique_flags.keys() | ||
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| # Collect static libraries | ||
| libs = [] | ||
| for inp in input_depset.to_list(): | ||
| for lib in inp.libraries: | ||
| if lib.pic_static_library: | ||
| libs.append(lib.pic_static_library) | ||
| elif lib.static_library: | ||
| libs.append(lib.static_library) | ||
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| lib_paths = [lib.path for lib in libs] | ||
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| ar_path = cc_toolchain.ar_executable | ||
| # FIXME ar_executable returned llvm-lib.exe on my system, but we want llvm-ar.exe | ||
| ar_path = ar_path.replace("llvm-lib.exe", "llvm-ar.exe") | ||
| ar_path = "" | ||
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| ctx.actions.run_shell( | ||
| command = "libtool -static -o {0} {1}".format(output_lib.path, " ".join(lib_paths)), | ||
| #command = "\"{0}\" rcT {1} {2} && echo -e 'create {1}\naddlib {1}\nsave\nend' | \"{0}\" -M".format(ar_path, output_lib.path, " ".join(lib_paths)), | ||
| inputs = libs + cc_toolchain.all_files.to_list(), | ||
| outputs = [output_lib], | ||
| mnemonic = "ArMerge", | ||
| progress_message = "Merging static library {}".format(output_lib.path), | ||
| ) | ||
| ctx.actions.write( | ||
| output = output_flags, | ||
| content = "\n".join(link_flags) + "\n", | ||
| ) | ||
| return [ | ||
| DefaultInfo(files = depset([output_flags, output_lib])), | ||
| ] | ||
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| cc_static_library = rule( | ||
| implementation = _cc_static_library_impl, | ||
| attrs = { | ||
| "deps": attr.label_list(), | ||
| "_cc_toolchain": attr.label( | ||
| default = TOOLS_CPP_REPO + "//tools/cpp:current_cc_toolchain", | ||
| ), | ||
| }, | ||
| toolchains = [TOOLS_CPP_REPO + "//tools/cpp:toolchain_type"], | ||
| incompatible_use_toolchain_transition = True, | ||
| ) |