diff options
Diffstat (limited to 'libstdc++-v3/config')
| -rw-r--r-- | libstdc++-v3/config/os/gnu-linux/os_defines.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/libstdc++-v3/config/os/gnu-linux/os_defines.h b/libstdc++-v3/config/os/gnu-linux/os_defines.h index f821486ec8f..01bfa9ddd4f 100644 --- a/libstdc++-v3/config/os/gnu-linux/os_defines.h +++ b/libstdc++-v3/config/os/gnu-linux/os_defines.h @@ -49,4 +49,16 @@ // version dynamically in case it has changed since libstdc++ was configured. #define _GLIBCXX_NO_OBSOLETE_ISINF_ISNAN_DYNAMIC __GLIBC_PREREQ(2,23) +#if __GLIBC_PREREQ(2, 27) +// Since glibc 2.27 pthread_self() is usable without linking to libpthread. +# define _GLIBCXX_NATIVE_THREAD_ID pthread_self() +#else +// Before then it was in libc.so.6 but not libc.a, and always returns 0, +// which breaks the invariant this_thread::get_id() != thread::id{}. +// So only use it if we know the libpthread version is available. +// Otherwise use (__gthread_t)1 as the ID of the main (and only) thread. +# define _GLIBCXX_NATIVE_THREAD_ID \ + (__gthread_active_p() ? __gthread_self() : (__gthread_t)1) +#endif + #endif |