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sanitize/tsan_interface.h is NOT modules friendly #164216

@pinskia

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@pinskia

fowarded from https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122344.

GCC's libstdc++'s memory includes sanitize/tsan_interface.h if thread sanitizer is turned on BUT if you use memory in a modules to export anything, GCC 15+ errors out due to TU-local entities being in use:

error: 'template<class _Tp> std::_Sp_atomic< <template-parameter-1-1> >::_Atomic_count::~_Atomic_count()' exposes TU-local entity '__tsan_mutex_not_static' tsan_interface.h:50:23: note: '__tsan_mutex_not_static' declared with internal linkage 50 | static const unsigned __tsan_mutex_not_static = 1 << 8; 

That is __tsan_mutex_not_static is not modules friendly.
None of the following are:

// Mutex has static storage duration and no-op constructor and destructor. // This effectively makes tsan ignore destroy annotation. static const unsigned __tsan_mutex_linker_init = 1 << 0; // Mutex is write reentrant. static const unsigned __tsan_mutex_write_reentrant = 1 << 1; // Mutex is read reentrant. static const unsigned __tsan_mutex_read_reentrant = 1 << 2; // Mutex does not have static storage duration, and must not be used after // its destructor runs. The opposite of __tsan_mutex_linker_init. // If this flag is passed to __tsan_mutex_destroy, then the destruction // is ignored unless this flag was previously set on the mutex. static const unsigned __tsan_mutex_not_static = 1 << 8; 

These constants still are an issue:

static const unsigned __tsan_mutex_not_static = 1 << 8;

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