[Bug build/31412] GCC 6 failed to build i386 glibc on Fedora 39

["hjl.tools at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31412

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Florian Weimer from comment #1)
> H.J., what do you mean by static linking in this context?

$ gcc -static ....

> I think your GCC 6 environment is misconfigured. Shouldn't it use system
> libgcc.a?

[hjl@gnu-cfl-1 tmp]$ gcc -print-file-name=libgcc.a
/usr/lib/gcc/x86_64-redhat-linux/13/libgcc.a
[hjl@gnu-cfl-1 tmp]$ /usr/gcc-14.0.1-x32/bin/gcc -print-file-name=libgcc.a 
/usr/gcc-14.0.1-x32/lib/gcc/x86_64-pc-linux-gnu/14.0.1/libgcc.a
[hjl@gnu-cfl-1 tmp]$ /usr/gcc-6.3.1-x32/bin/gcc -print-file-name=libgcc.a 
/usr/gcc-6.3.1-x32/lib/gcc/x86_64-pc-linux-gnu/6.3.1/libgcc.a
[hjl@gnu-cfl-1 tmp]$ 

All versions of GCC should use /usr/lib/gcc/x86_64-redhat-linux/13/libgcc.a?
It won't work for GCC 14 or higher.  The configure.ac change:

ommit d337ceb76d898935560dc264cf2ad36b17017db7
Author: Florian Weimer <fweimer@redhat.com>
Date:   Mon Oct 26 09:41:10 2015 +0100

    Use the CXX compiler only if it can create dynamic and static programs

            * configure.ac (CXX): Clear the variable if the C++ toolchain does
            not support static linking.
            * configure: Regenerate.

diff --git a/configure.ac b/configure.ac
index e502aa5db2..3c7f6c0096 100644
--- a/configure.ac
+++ b/configure.ac
@@ -57,9 +57,26 @@ AC_PROG_CXX
 # It's useless to us if it can't link programs (e.g. missing -lstdc++).
 AC_CACHE_CHECK([whether $CXX can link programs], libc_cv_cxx_link_ok, [dnl
 AC_LANG_PUSH([C++])
+# Default, dynamic case.
 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
          [libc_cv_cxx_link_ok=yes],
          [libc_cv_cxx_link_ok=no])
+# Static case.
+old_LDFLAGS="$LDFLAGS"
+LDFLAGS="$LDFLAGS -static"
+AC_LINK_IFELSE([AC_LANG_SOURCE([
+#include <iostream>
+
+int
+main()
+{
+  std::cout << "Hello, world!";
+  return 0;
+}
+])],
+         [],
+         [libc_cv_cxx_link_ok=no])
+LDFLAGS="$old_LDFLAGS"
 AC_LANG_POP([C++])])
 AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])

makes it impossible to properly build i386 glibc with GCC 6 on Fedora 39.

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