openssh @8.4p1_5: Configuration fails on Tiger with clang-3.4

[evanmiller (Evan Miller)]

Configuration fails quickly, possibly because clang-3.4 is using the broken-ish system linker instead of one provided by MP:

configure:3336: checking whether we are cross compiling
configure:3344: /opt/local/bin/clang-mp-3.4 -o conftest -pipe -Os -arch ppc -I/opt/local/include -DBROKEN_STRNVIS=1 -D__APPLE_SANDBOX_NAMED_EXTERNAL__ -D__APPLE_API_STRICT_CONFORMANCE -D__APPLE_LAUNCHD__ -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_net_openssh/openssh/work/include -L/opt/local/lib -Wl,-headerpad_max_install_names -Wl,-search_paths_first -arch ppc conftest.c  >&5
/usr/libexec/gcc/powerpc-apple-darwin8/4.0.1/ld: /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_net_openssh/openssh/work/.tmp/conftest-35030e.o has external relocation entries in non-writable section (__TEXT,__text) for symbols:
_fclose
_ferror
_fopen
collect2: ld returned 1 exit status
clang: error: linker (via gcc) command failed with exit code 1 (use -v to see invocation)

#60879 is related in that perhaps GCC wouldn't have this issue. Full config.log attached.

[kencu (Ken)]

for sure clang should be using ld64-97 here...not sure at this instant why it isn't. It does on intel...

however clang/llvm can't put out reliable darwin ppc code at present, even with the right linker.

There are some projects underway to try to come up with a version of clang/llvm for ppc that will someday work, but at this time they are incomplete.

See these repos for the still- incomplete WIP versions: ​https://github.com/iains/LLVM-7-branch and ​https://github.com/iains/darwin-xtools

The only reliable compilers for ppc/ppc64 Darwin at present are from gcc (all versions are OK).

[evanmiller (Evan Miller)]

Thanks for the clarification and information. I didn't realize that Clang/PPC was not a usable combination (it was automatically installed as a dependency of openssh and selected as the default compiler). I guess my real issue is #60385 so that GCC can build it instead.

[kencu (Ken)]

yeah, let's close this ticket, as we can't currently fix clang on ppc and there are other tickets about that, and continue on with #60385 which just needs someone to clean up that patch a bit and PR it.