Mike Hommey e19e94bc52 Bug 1729760 - Set -stdlib=libc++ for mac builds at the toolchain level. r=firefox-build-system-reviewers,nalexander
It's currently added manually to CXXFLAGS and bindgen flags, and is
notably missing from HOST_CXXFLAGS. However, setting it at the toolchain
level makes it inherited anywhere it's needed, including host builds and
bindgen.

Differential Revision: https://phabricator.services.mozilla.com/D126153
2021-09-21 04:45:34 +00:00
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