On Mon, 13 Apr 2020 at 06:22, Qiye Tan via Gcc-help <gcc-help@xxxxxxxxxxx> wrote: > > Dear GCC Helper: > > > > I have found that in website: > https://gcc.gnu.org/projects/cxx-status.html#cxx11, the Table Concurrency > shows that GCC 4.3 support the proposal N2660, however, when I went to GCC > 4.3 c++0x status website (https://gcc.gnu.org/gcc-4.3/cxx0x_status.html) > for detail information, I found that it shows that GCC 4.3 doesn’t support > proposal N2660. It's likely the gcc-4.3 docs were not updated at the time, and so are incorrect. > What’s more, I don’t know why my gcc doesn’t have the > predefine MACRO “__cpp_threadsafe_static_init”, it even doesn’t have the > MACRO “__cpp_rtti”. GCC 4.3.6 was released in 2011. The initial proposal for the idea of standardized macros was published in 2012: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3435.htm The first "__cpp_xxx" macros were proposed in 2013: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3694.htm But the __cpp_rtti macro wasn't proposed until much later: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4200.htm And the __cpp_threadsafe_static_init macro even later: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0096r5.html It's completely unsurprising that a compiler released in 2011 doesn't implement a feature invented several years later. > So, can you tell me that whether threadsafe_static_init > is supported in GCC 4.3? Thank you so much! The -fno-threadsafe-statics option is documented in the GCC 4.3 manual, so yes, it's supported.
