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c++: don't advertise C++20 concepts in C++14

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There have been various problems with -std=c++14 -fconcepts; let's stop
defining the feature test macro in that case.

gcc/c-family/ChangeLog:

	* c-cppbuiltin.cc (c_cpp_builtins): Don't define __cpp_concepts
	before C++17.
This commit is contained in:
Jason Merrill 2024-10-01 10:58:35 -04:00
parent f72b1a44ff
commit 1c9b440bf6
1 changed files with 1 additions and 1 deletions
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2
gcc/c-family/c-cppbuiltin.cc
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@ -1102,7 +1102,7 @@ c_cpp_builtins (cpp_reader *pfile)
cpp_define (pfile, "__cpp_deleted_function=202403L");
cpp_define (pfile, "__cpp_variadic_friend=202403L");
}
if (flag_concepts)
if (flag_concepts && cxx_dialect > cxx14)
cpp_define (pfile, "__cpp_concepts=202002L");
if (flag_contracts)
{