Avoid -Wunused-command-line-argument warnings in header parsing actions
#573
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rupprecht
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armandomontanez,
c-mita,
hvadehra,
pzembrod and
trybka
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For a real life example, see the log spam from this action: https://github.com/llvm/llvm-project/actions/runs/21224101850/job/61066339769. |
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rupprecht
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Jan 21, 2026
…177246) Running bazel CI is full of warnings like this: ``` INFO: From Compiling libc/hdr/types/clock_t.h: clang-21: warning: argument unused during compilation: '-c' [-Wunused-command-line-argument] ``` bazelbuild/rules_cc#573 is a possible fix in bazel itself. Until then, just use a copt to ignore it.
Author
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Nice, that would fix it too. |
llvm-sync bot
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Jan 21, 2026
…er parsing (#177246) Running bazel CI is full of warnings like this: ``` INFO: From Compiling libc/hdr/types/clock_t.h: clang-21: warning: argument unused during compilation: '-c' [-Wunused-command-line-argument] ``` bazelbuild/rules_cc#573 is a possible fix in bazel itself. Until then, just use a copt to ignore it.
Harrish92
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Jan 23, 2026
…lvm#177246) Running bazel CI is full of warnings like this: ``` INFO: From Compiling libc/hdr/types/clock_t.h: clang-21: warning: argument unused during compilation: '-c' [-Wunused-command-line-argument] ``` bazelbuild/rules_cc#573 is a possible fix in bazel itself. Until then, just use a copt to ignore it.
Harrish92
pushed a commit
to Harrish92/llvm-project
that referenced
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Jan 24, 2026
…lvm#177246) Running bazel CI is full of warnings like this: ``` INFO: From Compiling libc/hdr/types/clock_t.h: clang-21: warning: argument unused during compilation: '-c' [-Wunused-command-line-argument] ``` bazelbuild/rules_cc#573 is a possible fix in bazel itself. Until then, just use a copt to ignore it.
HugoSilvaSantos
pushed a commit
to HugoSilvaSantos/arm-toolchain
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Jan 27, 2026
…(#177246) Running bazel CI is full of warnings like this: ``` INFO: From Compiling libc/hdr/types/clock_t.h: clang-21: warning: argument unused during compilation: '-c' [-Wunused-command-line-argument] ``` bazelbuild/rules_cc#573 is a possible fix in bazel itself. Until then, just use a copt to ignore it.
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Since clang 20 (llvm/llvm-project@1efcc53), clang will report a warning that options like
-care unused when using-fsyntax-only. This leads to a lot of spam when running the parse headers action:To avoid using
-cwith-fsyntax-only, remove the header parsing action from the compiler_input_flags feature, and having the header parsing action itself expand%{source_file}so it can do so w/o the-c.