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

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280482

            Bug ID: 280482
           Summary: Buildworld fails with error: invalid argument
                    '-std=gnu99' not allowed with 'C++'
           Product: Base System
           Version: 14.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: conf
          Assignee: bugs@FreeBSD.org
          Reporter: zagazaw2004@gmail.com

Hello,

I'm following this guide to update FreeBSD 14.0-STABLE and I keep getting this:

****************************************************************************
===> usr.sbin/config (obj,all,install)
[Creating objdir /usr/obj/usr/src/amd64.amd64/tmp/obj-tools/usr.sbin/config...]
yacc -d  /usr/src/usr.sbin/config/config.y
yacc: 3 rules never reduced
cp y.tab.c config.c
lex   -olang.c /usr/src/usr.sbin/config/lang.l
file2c 'char kernconfstr[] = {' ',0};' < 
/usr/src/usr.sbin/config/kernconf.tmpl > kernconf.c
echo config.full: /usr/lib/libc.a
/usr/obj/usr/src/amd64.amd64/tmp/legacy/usr/lib/libegacy.a >> .depend
echo config.full: /usr/lib/libc++.a >> .depend
/usr/local/bin/ccache clang  -O2 -pipe -O -O2 -pipe -march=skylake -fno-common
-I. -I/usr/src/usr.sbin/config \
 -g -gz=zlib -MD  -MF.depend.config.o -MTconfig.o -std=gnu99
-Wno-format-zero-length -Wsystem-headers -Wall -Wno-format-y2k >
/usr/local/bin/ccache clang++  -O2 -pipe -O -O2 -pipe -march=skylake
-fno-common -I. -I/usr/src/usr.sbin/config \
-g -gz=zlib -MD -MF.depend.main.o -MTmain.o -Wno-format-zero-length
-Wsystem-headers -Wall -Wno-format-y2k -W -Wno-unused->
error: invalid argument '-std=gnu99' not allowed with 'C++'
*** Error code 1

Stop.
make[3]: stopped in /usr/src/usr.sbin/config
*** Error code 1

Stop.
make[2]: stopped in /usr/src
        8.11 real         4.98 user         2.96 sys
*** Error code 1

Stop.
make[1]: stopped in /usr/src
*** Error code 1

Stop.
make: stopped in /usr/src
*****************************************************************************

$ uname -a
FreeBSD redbox 14.0-STABLE FreeBSD 14.0-STABLE GENERIC amd64

*****************************************************************************
# cat /etc/make.conf

CPUTYPE=skylake
CFLAGS+= -O -O2 -pipe -march=${CPUTYPE}
CXXFLAGS+=${CFLAGS}
MACHINE_CPU+= avx2 avx sse42 sse41 ssse3 sse3 sse2 sse amd64 f16c mmx
MAKE_JOBS_NUMBER= 16

OPTIONS_UNSET+= QT5 QT6 CUPS VESA SCFB TWM XCONSOLE XCLOCK GNOME KDE EXAMPLES \
                DEBUG ASPELL

CC=clang
CXX=clang++
CPP=clang-cpp   

NO_SENDMAIL=true
*******************************************************************************

# cat /etc/src.conf

WITH_CCACHE_BUILD=yes
WITHOUT_SENDMAIL=yes
WITHOUT_TALK=yes
WITHOUT_TELNET=yes
WITHOUT_TFTP=yes
WITHOUT_IPFILTER=yes
WITHOUT_FLOPPY=yes
WITHOUT_GAMES=yes
********************************************************************************

Threads I read and didn't help solve this issue (I'm not trying to use GCC and
I'd like to stay with LLVM/clang if possible):

https://forums.freebsd.org/threads/trying-to-build-a-linux-c-program-on-freebsd-14-with-gcc9.92731/
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251170

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