Thiago Macieira 3d7586b760 Auto-detect whether 64-bit std::atomic really works ... The C++ standard says it must, but some badly-configured toolchains seem to be lacking support. In particular, for some 32-bit platforms without native support for them, GCC implements 64-bit atomics via out-of-line functions in libatomic. If that library is missing... well, then std::atomic 64-bit doesn't work and we mustn't try to use it. This was found when trying to compile Qt 5.6 for MIPS 32-bit: Linking library libQt5Core.so.5.6.0 .obj/qsimd.o: In function `std::__atomic_base<unsigned long long>::load(std::memory_order) const': /opt/poky/1.7/sysroots/mips32r2-poky-linux/usr/include/c++/4.9.1/bits/atomic_base.h:500: undefined reference to `__atomic_load_8' .obj/qsimd.o: In function `std::__atomic_base<unsigned long long>::store(unsigned long long, std::memory_order)': /opt/poky/1.7/sysroots/mips32r2-poky-linux/usr/include/c++/4.9.1/bits/atomic_base.h:478: undefined reference to `__atomic_store_8' Yocto bug report: https://bugzilla.yoctoproject.org/show_bug.cgi?id=8274 Change-Id: I42e7ef1a481840699a8dffff140224d6614e5c36 Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com> Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com> Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>		2015-09-22 22:46:08 +00:00
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configure	Auto-detect whether 64-bit std::atomic really works	2015-09-22 22:46:08 +00:00
shared/windows	Update copyright headers	2015-02-11 06:49:51 +00:00