Bug#1095984: warning: '_GLIBCXX_TIME_BITS64_ABI_TAG' redefined

[John David Anglin <dave@parisc-linux.org>]

Source: gcc-15
Version: 15-20250208-1 (experimental)
Severity: normal

Dear Maintainer,

The following warning occurs in most c++ compilations and it will
cause many testsuite fails:

In file included from /<<PKGBUILDDIR>>/src/libstdc++-v3/libsupc++/cxxabi.h:51,
                 from ../../../../src/libstdc++-v3/libsupc++/atexit_arm.cc:24:
/<<PKGBUILDDIR>>/build/hppa-linux-gnu/libstdc++-v3/include/hppa-linux-gnu/bits/c++config.h:947:9: warning: '_GLIBCXX_TIME_BITS64_ABI_TAG' redefined
  947 | #define _GLIBCXX_TIME_BITS64_ABI_TAG
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /<<PKGBUILDDIR>>/build/hppa-linux-gnu/libstdc++-v3/include/hppa-linux-gnu/bits/c++config.h:719:
/<<PKGBUILDDIR>>/build/hppa-linux-gnu/libstdc++-v3/include/hppa-linux-gnu/bits/os_defines.h:92:12: note: this is the location of the previous definition
   92 | #   define _GLIBCXX_TIME_BITS64_ABI_TAG [[__gnu__::__abi_tag__("__time64")]]
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

I believe the _GLIBCXX_TIME_BITS64_ABI_TAG defines are added by the
Debian build system.

Regards,
Dave Anglin

-- System Information:
Debian Release: trixie/sid
  APT prefers unreleased
  APT policy: (500, 'unreleased'), (500, 'unstable')
Architecture: hppa (parisc64)

Kernel: Linux 6.12.13-dirty (SMP w/4 CPU threads)
Kernel taint flags: TAINT_WARN
Locale: LANG=en_CA.UTF-8, LC_CTYPE=en_CA.UTF-8 (charmap=UTF-8), LANGUAGE=en_CA:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)