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Subject: [Bug c++/63287] __STDCPP_THREADS__ is not defined
Date: Thu, 12 Nov 2020 18:19:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D63287

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I tried to implement this by adding a macro definition to c_cpp_builtins in
gcc/c-family/c-cppbuiltin.c but failed. I think we want to inspect the
'thread_model' global variable and see if it is "single", but that might on=
ly
be available to the driver, not cc1plus.

Maybe the driver needs to check THREAD_MODEL_SPEC and thread_model and then
pass -D__STDCPP_THREADS__=3D1 to cc1plus when strcmp(thread_model, "single"=
).

For now, I think we can define it in libstdc++'s <bits/c++config.h> based on
the value of the _GLIBCXX_HAS_GTHREADS macro.=