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Subject: [Bug 223563] www/firefox fails to build
Date: Thu, 09 Nov 2017 17:22:48 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D223563

--- Comment #2 from Jan Beich <jbeich@FreeBSD.org> ---
Try disabling PGO option.

I only remember PGO working when Firefox could be built with base GCC 4.2.
Later GCC versions from ports had some issues with libgcov symbols. After
FreeBSD switched to Clang *and* libc++ the latter made using GCC hard becau=
se
GCC defaults to libstdc++ which is dangerous[1] to use with dependencies bu=
ilt
against libc++ (e.g., hunspell). Clang supports PGO (in FreeBSD 11.0+) but =
the
flags are a bit different[2].

[1] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D221288#c4
[2] https://bugzilla.mozilla.org/show_bug.cgi?id=3D1064049

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