[Bug 283155] Link fails with -flto: error loading plugin: Cannot open "/usr/bin/../lib/LLVMgold.so" (port multimedia/kew)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283155

--- Comment #9 from Dimitry Andric <dim@FreeBSD.org> ---
(In reply to Mark Millard from comment #8)
Yes, so the first problem is that other ports use the prefix
${arch}-portbld-freebsdX.Y-, while devel/binutils tries to be different, and
uses ${arch}-unknown-freebsdX.Y-:

$ ls -l /usr/local/bin/x8*
-rwxr-xr-x  4 root wheel 1720112 2024-11-23 23:37:08
/usr/local/bin/x86_64-portbld-freebsd15.0-c++13*
-rwxr-xr-x  4 root wheel 1720112 2024-11-23 23:37:08
/usr/local/bin/x86_64-portbld-freebsd15.0-g++13*
-rwxr-xr-x  3 root wheel 1716464 2024-11-24 00:07:52
/usr/local/bin/x86_64-portbld-freebsd15.0-gcc-13.3.0*
-rwxr-xr-x  2 root wheel   26208 2024-11-24 00:07:55
/usr/local/bin/x86_64-portbld-freebsd15.0-gcc-ar13*
-rwxr-xr-x  2 root wheel   26144 2024-11-24 00:07:55
/usr/local/bin/x86_64-portbld-freebsd15.0-gcc-nm13*
-rwxr-xr-x  2 root wheel   26144 2024-11-24 00:07:55
/usr/local/bin/x86_64-portbld-freebsd15.0-gcc-ranlib13*
-rwxr-xr-x  3 root wheel 1716464 2024-11-24 00:07:52
/usr/local/bin/x86_64-portbld-freebsd15.0-gcc13*
-rwxr-xr-x  2 root wheel 1719056 2024-11-23 23:37:14
/usr/local/bin/x86_64-portbld-freebsd15.0-gfortran13*
-r-xr-xr-x  1 root wheel 1212928 2024-12-06 15:17:53
/usr/local/bin/x86_64-unknown-freebsd15.0-addr2line*
-r-xr-xr-x  2 root wheel 1245144 2024-12-06 15:17:53
/usr/local/bin/x86_64-unknown-freebsd15.0-ar*
-r-xr-xr-x  2 root wheel 1955200 2024-12-06 15:17:54
/usr/local/bin/x86_64-unknown-freebsd15.0-as*
-r-xr-xr-x  1 root wheel 1211304 2024-12-06 15:17:53
/usr/local/bin/x86_64-unknown-freebsd15.0-c++filt*
-r-xr-xr-x  1 root wheel   38968 2024-12-06 15:17:53
/usr/local/bin/x86_64-unknown-freebsd15.0-elfedit*
-r-xr-xr-x  1 root wheel 1275096 2024-12-06 15:17:54
/usr/local/bin/x86_64-unknown-freebsd15.0-gprof*
-r-xr-xr-x  4 root wheel 2236920 2024-12-06 15:17:54
/usr/local/bin/x86_64-unknown-freebsd15.0-ld*
-r-xr-xr-x  4 root wheel 2236920 2024-12-06 15:17:54
/usr/local/bin/x86_64-unknown-freebsd15.0-ld.bfd*
-r-xr-xr-x  2 root wheel 1229232 2024-12-06 15:17:53
/usr/local/bin/x86_64-unknown-freebsd15.0-nm*
-r-xr-xr-x  2 root wheel 1360832 2024-12-06 15:17:53
/usr/local/bin/x86_64-unknown-freebsd15.0-objcopy*
-r-xr-xr-x  2 root wheel 2533640 2024-12-06 15:17:53
/usr/local/bin/x86_64-unknown-freebsd15.0-objdump*
-r-xr-xr-x  2 root wheel 1245144 2024-12-06 15:17:53
/usr/local/bin/x86_64-unknown-freebsd15.0-ranlib*
-r-xr-xr-x  2 root wheel 1112456 2024-12-06 15:17:53
/usr/local/bin/x86_64-unknown-freebsd15.0-readelf*
-r-xr-xr-x  1 root wheel 1214704 2024-12-06 15:17:53
/usr/local/bin/x86_64-unknown-freebsd15.0-size*
-r-xr-xr-x  1 root wheel 1218776 2024-12-06 15:17:53
/usr/local/bin/x86_64-unknown-freebsd15.0-strings*
-r-xr-xr-x  2 root wheel 1360848 2024-12-06 15:17:53
/usr/local/bin/x86_64-unknown-freebsd15.0-strip*

This particular bug would simply go away if devel/binutils used
${arch}-portbld-freebsdX.Y- too.

The second problem is that the GNU ld driver searches in the wrong path for
LLVMgold.so. If somebody would actually want to use LLVMgold.so (not really
recommended), they'd have to first choose an LLVM version to use, then try any
of:

/usr/local/llvm15/lib/LLVMgold.so
/usr/local/llvm16/lib/LLVMgold.so
/usr/local/llvm17/lib/LLVMgold.so
/usr/local/llvm18/lib/LLVMgold.so
/usr/local/llvm19/lib/LLVMgold.so

That said, the better solution seems fixing binutils to me.

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