2022-10-19 11:35:55 +03:00
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bazel-zig-cc and llvm
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---------------------
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bazel-zig-cc has a performance issue when compiling many files. This repository
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reproduces that.
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Steps to reproduce
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------------------
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2022-11-21 06:25:58 +02:00
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llvm14: 12-13 seconds to compile 64 binaries on an 8-core machine:
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2022-10-19 11:35:55 +03:00
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```
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$ bazel clean; bazel shutdown; bazel build --extra_toolchains=@llvm_toolchain//:cc-toolchain-x86_64-linux ...
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INFO: Starting clean (this may take a while). Consider using --async if the clean takes more than several minutes.
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Starting local Bazel server and connecting to it...
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2022-11-21 06:25:58 +02:00
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INFO: Analyzed 64 targets (41 packages loaded, 1426 targets configured).
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INFO: Found 64 targets...
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INFO: Elapsed time: 12.454s, Critical Path: 1.11s
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INFO: 321 processes: 193 internal, 128 linux-sandbox.
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INFO: Build completed successfully, 321 total actions
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2022-10-19 11:35:55 +03:00
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```
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2022-11-21 06:25:58 +02:00
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zig cc: 2,5 minutes:
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2022-10-19 11:35:55 +03:00
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```
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$ bazel clean; bazel shutdown; bazel build --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 ...
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INFO: Starting clean (this may take a while). Consider using --async if the clean takes more than several minutes.
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Starting local Bazel server and connecting to it...
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2022-11-21 06:25:58 +02:00
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INFO: Analyzed 64 targets (41 packages loaded, 14450 targets configured).
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INFO: Found 64 targets...
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INFO: Elapsed time: 142.264s, Critical Path: 20.65s
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INFO: 257 processes: 129 internal, 128 linux-sandbox.
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INFO: Build completed successfully, 257 total actions
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2022-10-26 00:00:18 +03:00
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```
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