[Bug 280482] Buildworld fails with error: invalid argument '-std=gnu99' not allowed with 'C++'

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 29 Jul 2024 22:01:47 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280482

Brooks Davis <brooks@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|New                         |Closed
                 CC|                            |brooks@FreeBSD.org
         Resolution|---                         |Not A Bug

--- Comment #1 from Brooks Davis <brooks@FreeBSD.org> ---
This line is almost certainly your issue:

CXXFLAGS+=${CFLAGS}

This adds the entire contents of CFLAGS at the time the CXXFLAGS variable is
expanded to the end of the current value of CXXFLAGS.  That means it's adding
-std=gnu99 to CXXFLAGS.

If you want to have one place to set these (mostly pointless) flags, then you
need to do something like:

MY_CUSTOM_CFLAGS= -march=${CPUTYPE}
CFLAGS+=${MY_CUSTOM_CFLAGS}
CXXFLAGS+=${MY_CUSTOM_CFLAGS}

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