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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++/110462] [14 regression] Build failure with musl-1.2.4
 (filesystem/ops-common.h:377:5: error: 'off64_t' was not declared in this
 scope; did you mean 'off_t'?)
Date: Wed, 28 Jun 2023 17:15:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110462

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This would "fix" it, but only by disabling copy_file_range use with musl:

--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -5160,7 +5160,7 @@ dnl
       linux*)
        GCC_TRY_COMPILE_OR_LINK(
          [#include <unistd.h>],
-         [copy_file_range(1, nullptr, 2, nullptr, 1, 0);],
+         [copy_file_range(1, (off64_t*)nullptr, 2, (off64_t*)nullptr, 1, 0=
);],
          [glibcxx_cv_copy_file_range=3Dyes],
          [glibcxx_cv_copy_file_range=3Dno])
        ;;


It would be better to figure out how to use it.=