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| author | Junio C Hamano <gitster@pobox.com> | 2025-03-29 16:39:10 +0900 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2025-03-29 16:39:10 +0900 |
| commit | f76fe4ab067b9d6e530edf8205b5672ebad27bfc (patch) | |
| tree | 7d8e5a823e75ee64c35b839fceedd9cbeb5074c5 /git-compat-util.h | |
| parent | b9b404fa1cdb43a54962188d883fafb5d2f9912d (diff) | |
| parent | 16f5d967e2267ea37cd29d7aee21994921b6b98c (diff) | |
| download | git-f76fe4ab067b9d6e530edf8205b5672ebad27bfc.tar.gz | |
Merge branch 'jk/use-wunreachable-code-for-devs'
Enable -Wunreachable-code for developer builds.
* jk/use-wunreachable-code-for-devs:
config.mak.dev: enable -Wunreachable-code
git-compat-util: add NOT_CONSTANT macro and use it in atfork_prepare()
run-command: use errno to check for sigfillset() error
Diffstat (limited to 'git-compat-util.h')
| -rw-r--r-- | git-compat-util.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/git-compat-util.h b/git-compat-util.h index e123288e8f..cf733b38ac 100644 --- a/git-compat-util.h +++ b/git-compat-util.h @@ -1583,4 +1583,13 @@ static inline void *container_of_or_null_offset(void *ptr, size_t offset) ((uintptr_t)&(ptr)->member - (uintptr_t)(ptr)) #endif /* !__GNUC__ */ +/* + * Prevent an overly clever compiler from optimizing an expression + * out, triggering a false positive when building with the + * -Wunreachable-code option. false_but_the_compiler_does_not_know_it_ + * is defined in a compilation unit separate from where the macro is + * used, initialized to 0, and never modified. + */ +#define NOT_CONSTANT(expr) ((expr) || false_but_the_compiler_does_not_know_it_) +extern int false_but_the_compiler_does_not_know_it_; #endif |