[PATCH] config.mak.dev: suppress C11 extension warning for Clang on Linux
- From
- Shardul Natu via GitGitGadget <gitgitgadget@gmail.com>
- Date
- May 7, 2026, 02:16 UTC
- Message-ID
- <pull.2291.git.git.1778120192298.gitgitgadget@gmail.com>
From: Shnatu <snatu@google.com>
When building Git with Clang on Linux with DEVELOPER=1, the build fails because Clang treats C11 features used in glibc headers as extensions and raises errors due to -std=gnu99, -pedantic, and -Werror.
Specifically, glibc's string.h uses _Generic (a C11 feature) in macros like strchr. When these macros are expanded in Git's C files, Clang warns about them being C11 extensions.
GCC does not exhibit this behavior because it suppresses pedantic warnings for macros defined in system headers.
To fix this, add -Wno-c11-extensions to DEVELOPER_CFLAGS when using Clang, but restrict it to Linux (uname_S == Linux). This suppresses the warning for glibc headers while keeping the build strict on other platforms (like macOS) to catch accidental C11 usage in Git's own code.
Signed-off-by: Shnatu <snatu@google.com>
---
config.mak.dev: suppress C11 extension warning for Clang on LinuxPublished-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-2291%2Fkiranani%2Fnext-2-v1 Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-2291/kiranani/next-2-v1 Pull-Request: https://github.com/git/git/pull/2291
config.mak.dev | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/config.mak.dev b/config.mak.dev index c8dcf78779..f1dcf4329a 100644 --- a/config.mak.dev +++ b/config.mak.dev @@ -87,6 +87,9 @@ endif # The bug was fixed in Apple clang 12. # ifneq ($(filter clang1,$(COMPILER_FEATURES)),) # if we are using clang +ifeq ($(uname_S),Linux) +DEVELOPER_CFLAGS += -Wno-c11-extensions +endif ifeq ($(uname_S),Darwin) # if we are on darwin ifeq ($(filter clang12,$(COMPILER_FEATURES)),) # if version < 12 DEVELOPER_CFLAGS += -Wno-missing-braces base-commit: 4f69b47b940100b02630f745a52f9d9850f122b2
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