tree 4d32b299003dcbe65610381c2b83a2e6b2f52e80
parent 5295548c0763f5bd5c5b6c87dd1e689dd9a12168
author Dimitry Andric <dimitry@andric.com> 1638119346 +0100
committer Copybara-Service <copybara-worker@google.com> 1638134799 -0800

[AArch64] Avoid crashing on invalid -Wa,-march= values

As reported in https://bugs.freebsd.org/260078, the gnutls Makefiles
pass -Wa,-march=all to compile a number of assembly files. Clang does
not support this -march value, but because of a mistake in handling
the arguments, an unitialized Arg pointer is dereferenced, which can
cause a segfault.

Work around this by adding a check if the local WaMArch variable is
initialized, and if so, using its value in the diagnostic message.

Reviewed By: tschuett

Differential Revision: https://reviews.llvm.org/D114677

GitOrigin-RevId: df08b2fe8b35cb63dfb3b49738a3494b9b4e6f8e