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Thanks, Alex -- >8 -- When __has_feature was introduced for GCC 14, I included the feature cxx_constexpr_string_builtins, since of the relevant string builtins that GCC implements, it seems to support constexpr evaluation of those builtins. However, as the PR shows, GCC doesn't implement the full list of builtins in the clang documentation. After enumerating the builtins, the clang docs [1] say: > Support for constant expression evaluation for the above builtins can > be detected with __has_feature(cxx_constexpr_string_builtins). and a strict reading of this would suggest we can't really support constexpr evaluation of a builtin if we don't implement the builtin in the first place. So the conservatively correct thing to do seems to be to stop advertising the feature altogether to avoid failing to build code which assumes the presence of this feature implies the presence of all the builtins listed in the clang documentation. [1] : https://clang.llvm.org/docs/LanguageExtensions.html#string-builtins gcc/cp/ChangeLog: PR c++/113658 * cp-objcp-common.cc (cp_feature_table): Remove entry for cxx_constexpr_string_builtins. gcc/testsuite/ChangeLog: PR c++/113658 * g++.dg/ext/pr113658.C: New test. diff --git a/gcc/cp/cp-objcp-common.cc b/gcc/cp/cp-objcp-common.cc index f06edf04ef0..85dde0459fa 100644 --- a/gcc/cp/cp-objcp-common.cc +++ b/gcc/cp/cp-objcp-common.cc @@ -110,7 +110,6 @@ static constexpr cp_feature_info cp_feature_table[] = { "cxx_alignof", cxx11 }, { "cxx_attributes", cxx11 }, { "cxx_constexpr", cxx11 }, - { "cxx_constexpr_string_builtins", cxx11 }, { "cxx_decltype", cxx11 }, { "cxx_decltype_incomplete_return_types", cxx11 }, { "cxx_default_function_template_args", cxx11 }, diff --git a/gcc/testsuite/g++.dg/ext/pr113658.C b/gcc/testsuite/g++.dg/ext/pr113658.C new file mode 100644 index 00000000000..f4a34888f28 --- /dev/null +++ b/gcc/testsuite/g++.dg/ext/pr113658.C @@ -0,0 +1,13 @@ +// { dg-do compile } +// { dg-options "" } + +// PR113658: we shouldn't declare support for cxx_constexpr_string_builtins as +// GCC is missing some of the builtins that clang implements. + +#if __has_feature (cxx_constexpr_string_builtins) +#error +#endif + +#if __has_extension (cxx_constexpr_string_builtins) +#error +#endif