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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/112882] [14 Regression] std::clamp no longer usable
 in header only mode
Date: Wed, 06 Dec 2023 17:20:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112882

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This minimal fix is enough to remove the reference to __glibcxx_assert_fail
when optimization is enabled (at any level):

--- a/libstdc++-v3/include/bits/c++config
+++ b/libstdc++-v3/include/bits/c++config
@@ -598,7 +598,7 @@ namespace std

 # define __glibcxx_assert(cond)=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20
\
   do {                                                                 \
-    if _GLIBCXX17_CONSTEXPR (_GLIBCXX_DO_ASSERT)                       \
+    if (_GLIBCXX_DO_ASSERT)                    \
       if (__builtin_expect(!bool(cond), false))=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
\
        _GLIBCXX_ASSERT_FAIL(cond);                                     \
   } while (false)

But we still need the more complete fix for -O0.=