[Bug 224917] www/firefox: bus error on stable/10 with 57.0.3,1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224917

--- Comment #6 from Jan Beich <jbeich at FreeBSD.org> ---
(In reply to Mikhail T. from comment #5)
> * clang-devel (6.0.0), clang40, clang39 all fail to compile because
> of syntax errors (something about Args vs. args, as well as char16_t
> being a built-in type)

Overriding CC/CXX/CPP on command line may not work, so set those via
environment, make.conf or makefile. For one, moz.configure appends -std=gnu99
to CC, -std=gnu++11 to CXX.

> * gcc6 and gcc7 compile, but fail to link -- some hideous-looking
> C++ symbol not found

See bug 221288. Mixing libstdc++ and libc++ isn't currently supported. It only
worked somewhat for base libstdc++ because it used libcxxrt. So, to build with
lang/gcc* rebuild any dependency that links against libc++.

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