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There is no __gthread_recursive_mutex_destroy function in the gthreads API. Trying to use __gthread_mutex_destroy fails to compile on platforms where the mutex types are different. To avoid resource leaks libstdc++ needs to hack around the missing function with overloaded functions and SFINAE tricks to detect how a recursive mutex can be destroyed. This patch extends the gthreads API to include __gthread_recursive_mutex_destroy, defining it for each gthread model, and removing the hacks from libstdc++. libgcc: PR other/53889 * gthr.h (__gthread_recursive_mutex_destroy): Document new required function. * gthr-posix.h (__gthread_recursive_mutex_destroy): Define. * gthr-single.h (__gthread_recursive_mutex_destroy): Likewise. * config/gthr-rtems.h (__gthread_recursive_mutex_destroy): Likewise. * config/gthr-vxworks.h (__gthread_recursive_mutex_destroy): Likewise. * config/i386/gthr-win32.h (__gthread_recursive_mutex_destroy): Likewise. * config/mips/gthr-mipssde.h (__gthread_recursive_mutex_destroy): Likewise. * config/pa/gthr-dce.h (__gthread_recursive_mutex_destroy): Likewise. * config/s390/gthr-tpf.h (__gthread_recursive_mutex_destroy): Likewise. libstdc++-v3: PR other/53889 * include/std/mutex (__recursive_mutex_base::~__recursive_mutex_base): Use __gthread_recursive_mutex_destroy. (__recursive_mutex_base::_S_destroy): Remove. (__recursive_mutex_base::_S_destroy_win32): Likewise. * include/ext/concurrence.h (__recursive_mutex::~__recursive_mutex): Use __gthread_recursive_mutex_destroy. (__recursive_mutex::_S_destroy): Remove. (__recursive_mutex::_S_destroy_win32): Likewise. Tested x86_64-linux. Are the libgcc parts OK for trunk?
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