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Merge branch 'jk/use-wunreachable-code-for-devs'

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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
This commit is contained in:
Junio C Hamano
2025-03-29 16:39:10 +09:00
parent b9b404fa1c 16f5d967e2
commit f76fe4ab06
6 changed files with 22 additions and 1 deletions
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9
git-compat-util.h
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@@ -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