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Set matching CC alongside CXX in Linux CI matrix #4863

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Merged
vitaut merged 2 commits into from
Jul 30, 2026
+18 −3
Merged

Set matching CC alongside CXX in Linux CI matrix #4863

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c5aaff5
Set matching CC alongside CXX in Linux CI matrix
hexonal Jul 21, 2026
5ae4721
Skip c-test when the C compiler is Clang < 3.8
hexonal Jul 23, 2026
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7 changes: 7 additions & 0 deletions .github/workflows/linux.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -179,6 +179,13 @@ jobs:
sudo apt install locales-all
cmake -E make_directory ${{runner.workspace}}/build

- name: Select matching C compiler
run: |
cc=${{matrix.cxx}}
cc=${cc/clang++/clang}
cc=${cc/g++/gcc}
echo "CC=$cc" >> "$GITHUB_ENV"

- name: Configure
working-directory: ${{runner.workspace}}/build
env:
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14 changes: 11 additions & 3 deletions test/CMakeLists.txt
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Expand Up @@ -242,6 +242,14 @@ if (FMT_CUDA_TEST)
endif ()

enable_language(C)
add_executable(c-test c-test.c)
target_link_libraries(c-test PRIVATE fmt::fmt-c)
add_test(NAME c-test COMMAND c-test)
# Clang < 3.8 doesn't apply array-to-pointer decay to the controlling
# expression of _Generic (https://llvm.org/PR16340), so fmt-c.h's argument
# dispatch doesn't match string literals there.
if (CMAKE_C_COMPILER_ID STREQUAL "Clang" AND CMAKE_C_COMPILER_VERSION
VERSION_LESS 3.8)
message(STATUS "Skipping c-test: _Generic is broken in Clang < 3.8")
else ()
add_executable(c-test c-test.c)
target_link_libraries(c-test PRIVATE fmt::fmt-c)
add_test(NAME c-test COMMAND c-test)
endif ()
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