linux-kernel - LLVM not detected in bpfutil due to LLVM 16 requiring c++17

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Message-ID: <CALS7K9V1j6ufrQ=6nGjyHQCWb7-YiqNdctBWk8og1gW_q4C4dA@mail.gmail.com>
Date:   Fri, 14 Apr 2023 22:36:35 +1200
From:   No Name <xbjfk.github@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     nathan@...nel.org, ndesaulniers@...gle.com, llvm@...ts.linux.dev
Subject: LLVM not detected in bpfutil due to LLVM 16 requiring c++17

This is my first time reporting a bug, so apologies if I get something wrong.
In tools/build/feature/Makefile, line 342, the c++ std is set to
gnu++14, whereas LLVM 16 now requires c++17 to include the headers.
This results in the llvm feature being falsely disabled for bpfutil.
Perhaps the --cxxflags, --ldflags and --libs options of llvm-config
should instead?

Reagan.