diff options
| -rw-r--r-- | configure.ac | 1 | ||||
| -rw-r--r-- | include/c11/threads_posix.h | 26 |
2 files changed, 27 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 47c138a..fc0b1db 100644 --- a/configure.ac +++ b/configure.ac @@ -233,6 +233,7 @@ AX_GCC_FUNC_ATTRIBUTE([pure]) AX_GCC_FUNC_ATTRIBUTE([returns_nonnull]) AX_GCC_FUNC_ATTRIBUTE([unused]) AX_GCC_FUNC_ATTRIBUTE([warn_unused_result]) +AX_GCC_FUNC_ATTRIBUTE([weak]) AM_CONDITIONAL([GEN_ASM_OFFSETS], test "x$GEN_ASM_OFFSETS" = xyes) diff --git a/include/c11/threads_posix.h b/include/c11/threads_posix.h index 11d36e4..61b7fab 100644 --- a/include/c11/threads_posix.h +++ b/include/c11/threads_posix.h @@ -169,6 +169,32 @@ mtx_destroy(mtx_t *mtx) pthread_mutex_destroy(mtx); } +/* + * XXX: Workaround when building with -O0 and without pthreads link. + * + * In such cases constant folding and dead code elimination won't be + * available, thus the compiler will always add the pthread_mutexattr* + * functions into the binary. As we try to link, we'll fail as the + * symbols are unresolved. + * + * Ideally we'll enable the optimisations locally, yet that does not + * seem to work. + * + * So the alternative workaround is to annotate the symbols as weak. + * Thus the linker will be happy and things don't clash when building + * with -O1 or greater. + */ +#ifdef HAVE_FUNC_ATTRIBUTE_WEAK +__attribute__((weak)) +int pthread_mutexattr_init(pthread_mutexattr_t *attr); + +__attribute__((weak)) +int pthread_mutexattr_settype(pthread_mutexattr_t *attr, int type); + +__attribute__((weak)) +int pthread_mutexattr_destroy(pthread_mutexattr_t *attr); +#endif + // 7.25.4.2 static inline int mtx_init(mtx_t *mtx, int type) |