Em domingo, 9 de abril de 2017, às 16:47:25 PDT, Lubomir I. Ivanov escreveu: > g++ test.cpp -Wall -std=c++11 -O1 -S -o test-meyer.S > > so, it's guarded with ___cxa_guard_acquire() and it appears that the > c++11 flag doesn't matter much.
That's because GCC has used thread-safe initialisation of function statics for a long time. I know it was specified in the IA-64 C++ ABI, dating from 1999, but it's possible GCC supported it for longer (3.3 or earlier). But it wasn't part of the C++ language specification. It only said that "if the initialisation is reentered, behaviour is undefined". So other compilers did not need to implement it. C++11 did add a requirement that such initialisation must not deadlock. This is known to trip several implementations. Apple operating systems are known to fail that second bit too. -- Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org Software Architect - Intel Open Source Technology Center _______________________________________________ subsurface mailing list subsurface@subsurface-divelog.org http://lists.subsurface-divelog.org/cgi-bin/mailman/listinfo/subsurface
