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This moves the checks for POSIX semaphores to configure time. As well as requiring <semaphore.h> and SEM_VALUE_MAX, we also require the sem_timedwait function. That was only optional in POSIX 2001 (and is absent on Darwin). libstdc++-v3/ChangeLog: * acinclude.m4 (GLIBCXX_CHECK_GTHREADS): Check for * config.h.in: Regenerate. * configure: Regenerate. * include/bits/semaphore_base.h (_GLIBCXX_HAVE_POSIX_SEMAPHORE): Check autoconf macro instead of defining it here.
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.