4d41304def
This can successfully build a C library: bazel build --config=clang //third_party:libpng This can build and run a statically-linked executable: bazel test --config=clang //:bazel_test For more verbose compile and linking output, add the `--features diagnostic` flag to a Bazel command (see _make_diagnostic_flags() in toolchain/clang_toolchain_config.bzl. Similarly, a `--features print_search_dirs` can be used to show where clang is looking for libraries etc to link against. These features are made available for easier debugging. Suggested review order: - Read https://docs.bazel.build/versions/4.2.1/tutorial/cc-toolchain-config.html if unfamiliar with setting up C++ toolchains in Bazel - .bazelrc and WORKSPACE.bazel that configure use and download of the toolchain (Clang 13, musl 1.2.2) - toolchain/build_toolchain.bzl which downloads and assembles the toolchain (w/o installing anything on the host machine) - toolchain/BUILD.bazel and toolchain/*trampoline.sh to see the setup of the toolchain rules. - toolchain/clang_toolchain_config.bzl to see the configuration of the toolchain. Pay special attention to the various command line flags that are set. - See that tools/bazel_test.cc has made a new home in experimental/bazel_test/bazel_test.cpp, with a companion BUILD.bazel. Note the addition of some function calls that test use of the C++ standard library. The number being used to test the PNG library is the latest and greatest that verifies we are compiling the one brought in via DEPS (and not a local one). - third_party/* to see how png (and its dependent zlib) have been built. Pay special attention to the musl_compat hack to fix static linking (any idea what the real cause is?) - //BUILD.bazel to see definition of the bazel_test executable. Change-Id: I7b0922d0d45cb9be8df2fd5fa5a1f48492654d5f Bug: skia:12541 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/461178 Reviewed-by: Ben Wagner <bungeman@google.com> Reviewed-by: Leandro Lovisolo <lovisolo@google.com>
16 lines
943 B
Plaintext
16 lines
943 B
Plaintext
workspace(name = "skia")
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load("//toolchain:build_toolchain.bzl", "build_cpp_toolchain")
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build_cpp_toolchain(
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# Meant to run on amd64 linux and compile for amd64 linux using musl as the c library.
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name = "clang_linux_amd64_musl",
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# From https://github.com/llvm/llvm-project/releases/download/llvmorg-13.0.0/clang+llvm-13.0.0-x86_64-linux-gnu-ubuntu-20.04.tar.xz.sha256
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clang_prefix = "clang+llvm-13.0.0-x86_64-linux-gnu-ubuntu-20.04/",
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clang_sha256 = "2c2fb857af97f41a5032e9ecadf7f78d3eff389a5cd3c9ec620d24f134ceb3c8",
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clang_url = "https://github.com/llvm/llvm-project/releases/download/llvmorg-13.0.0/clang+llvm-13.0.0-x86_64-linux-gnu-ubuntu-20.04.tar.xz",
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# From https://packages.debian.org/bullseye/amd64/musl-dev/download
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musl_dev_sha256 = "b017792ad6ba3650b4889238c73cd19c1d6b0e39ca8319cdd3ad9e16374e614e",
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musl_dev_url = "http://ftp.debian.org/debian/pool/main/m/musl/musl-dev_1.2.2-1_amd64.deb",
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)
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