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glibc 2.34 and later doesn't have separate libpthread (libpthread.so.0 is a dummy shared library with just some symbol versions for compatibility, but all the pthread_* APIs are in libc.so.6). So, we don't need to do the .weakref dances to check whether a program has been linked with -lpthread or not, in dynamically linked apps those will be always true anyway. In -static linking, this fixes various issues people had when only linking some parts of libpthread.a and getting weird crashes. A hack for that was what e.g. some Fedora glibcs used, where libpthread.a was a library containing just one giant *.o file which had all the normal libpthread.a *.o files linked with -r together. libstdc++-v3 actually does something like this already since r10-10928, the following patch is meant to fix it even for libgfortran, libobjc and whatever else uses gthr.h. 2024-04-25 Jakub Jelinek <jakub@redhat.com> * gthr.h (GTHREAD_USE_WEAK): Redefine to 0 for GLIBC 2.34 or later.
This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.