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Add -Werror=c99-designator and fix brace elision warnings #15168

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Merged
Ericson2314 merged 1 commit into from
Feb 6, 2026
Merged

Add -Werror=c99-designator and fix brace elision warnings #15168

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5 changes: 5 additions & 0 deletions nix-meson-build-support/common/meson.build
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,11 @@ do_pch = cxx.get_id() == 'clang'
# instantiations in libutil and libstore.
if cxx.get_id() == 'clang'
add_project_arguments('-fpch-instantiate-templates', language : 'cpp')
# Catch brace elision bugs: when WorkerProto::Version changed from `unsigned int`
# to `struct { unsigned int major; uint8_t minor; }`, `.version = 16` silently
# became `.version = {16, 0}` instead of failing, breaking protocol compatibility
# in a subtle way
add_project_arguments('-Werror=c99-designator', language : 'cpp')
endif

# Detect if we're using libstdc++ (GCC's standard library)
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