[Bug 255359] www/firefox: Fails to build with LTO enabled after recent update: LLVM ERROR: Broken module found

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255359

--- Comment #3 from Jan Beich <jbeich at FreeBSD.org> ---
Cross-language LTO likely requires Clang and rustc to use the same LLVM
version. lang/rust at 1.51.0 bundles LLVM 11.0.1, so to use LTO add
DEFAULT_VERSIONS+=llvm=11 to /etc/make.conf or www/firefox/Makefile.local.
However, the next lang/rust update to 1.52.0 (scheduled on 2021-05-06) will
have LLVM 12.0.0.

If LTO is important it needs to be enabled by default to avoid regressions due
to changes in framework, dependencies or Firefox updates.

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