[Bug 224847] graphics/mesa-libs: make configure (not config) crashes

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224847

--- Comment #11 from Greg V <greg at unrelenting.technology> ---
(In reply to Brooks Davis from comment #10)
The LLVM ports haven't changed, but they should! See bug 223191. To sum up:

- the ports set the LLVM_BUILD_LLVM_DYLIB CMake option but not
LLVM_LINK_LLVM_DYLIB, which makes llvm-config pretty broken (it defaults to
static linking, and when asked for dynamic linking with --link-shared it
outputs nonexistent tiny libraries libLLVM(Whatever).so instead of the big
monolithic libLLVM that actually exists). They should set LLVM_LINK_LLVM_DYLIB!
- CMake's standard library finds the whole path to libexecinfo:
https://github.com/Kitware/CMake/blob/40dea7e4b2e1c4518337bba284a233bf6f788a1a/Modules/FindBacktrace.cmake#L75
LLVM uses that result as if it were a library name, creating the broken
"-l/usr/lib/libexecinfo.so" linker flag in llvm-config's output for static
linking.

LLVM consumers also should change:

- LLVM can add git version suffixes (this thread). Consumers should handle
them. E.g. Meson 0.44 already does:
https://github.com/mesonbuild/meson/pull/2787 — and Mesa will handle that for
older Mesons
https://lists.freedesktop.org/archives/mesa-dev/2018-January/181200.html We're
on stable release Mesa, so we should fix this in the old (autoconf) Mesa build
system.

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