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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/105009] [12 Regression] Fails to build with
 --target=xtensa-esp32-elf
Date: Tue, 22 Mar 2022 17:05:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105009

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
That message is clearly from clang++, when I try:
extern inline __attribute__ ((__gnu_inline__)) int
tree_to_poly_int64 (int i)
{
  return i + 1;
}

int
tree_to_poly_int64 (int i)
{
  return i + 2;
}
clang++ complains:
error: redefinition of a 'extern inline' function 'tree_to_poly_int64' is n=
ot
supported in C++
Those inlines in tree.h are guarded with
#if !defined ENABLE_TREE_CHECKING && (GCC_VERSION >=3D 4003)
and
#define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)

If you are using the ill-designed -fgnuc-version=3D option for clang, don't.
While I've added a hack for it for libstdc++ headers, there is no way we are
going to do this everywhere in GCC sources itself.
__GNUC__ macro doesn't mean support for GNU extensions, it means using the =
GCC
compiler or at least something compatible with it up to the version, which
perhaps ICC more/less is, but clang certainly is not.=