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From:   Sedat Dilek <sedat.dilek@gmail.com>
Date:   Sun, 4 Apr 2021 17:19:21 +0200
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Subject: Re: Usage of CXX in tools directory
To:     Masahiro Yamada <masahiroy@kernel.org>, Yonghong Song <yhs@fb.com>,
        Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>,
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        Nathan Chancellor <nathan@kernel.org>,
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        Peter Zijlstra <peterz@infradead.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Ingo Molnar <mingo@redhat.com>, Jiri Olsa <jolsa@redhat.com>,
        Namhyung Kim <namhyung@kernel.org>
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> So you need to pass CXX=clang++ manually when playing in tools directory:
>
> MAKE="make V=1
> MAKE_OPTS="HOSTCC=clang HOSTCXX=clang++ HOSTLD=ld.lld CC=clang
> CXX=clang++ LD=ld.lld LLVM=1 LLVM_IAS=1"
> MAKE_OPTS="MAKE_OPTS $PAHOLE=/opt/pahole/bin/pahole"
>
> $ LC_ALL=C $MAKE $MAKE_OPTS -C tools/testing/selftests/bpf/ clean
> $ LC_ALL=C $MAKE $MAKE_OPTS -C tools/testing/selftests/bpf/
>

Correct:

MAKE="make V=1"
MAKE_OPTS="HOSTCC=clang HOSTCXX=clang++ HOSTLD=ld.lld CC=clang
CXX=clang++ LD=ld.lld LLVM=1 LLVM_IAS=1"
MAKE_OPTS="$MAKE_OPTS PAHOLE=/opt/pahole/bin/pahole"

- Sedat -