gcc7 @7.3.0: Selftests fail with "Illegal instruction: 4"

[chucko58 (Chuck Fry)]

'port install gcc7' fails repeatably on this MacBook Pro running macOS 10.12.6. The failure appears to be in the selftests. This copy of MacPorts was built w/o sysadmin privileges, and we are running some funky security stuff here, so this may be unique to our configuration.

The complete build log (with tracing enabled) is attached as a gzipped file. The key part of the log:

:info:build /Users/cfry/var/macports/build/_Users_cfry_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc7/gcc7/work/build/./gcc/xgcc -B/Users/cfry/var/macports/build/_Users_cfry_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc7/gcc7/work/build/./gcc/ -nostdinc -x c /dev/null -S -o /dev/null -fself-test=/Users/cfry/var/macports/build/_Users_cfry_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc7/gcc7/work/gcc-7.3.0/gcc/testsuite/selftests
:info:build <built-in>: internal compiler error: Illegal instruction: 4
:info:build libbacktrace could not find executable to open
:info:build Please submit a full bug report,
:info:build with preprocessed source if appropriate.
:info:build See <https://trac.macports.org/newticket> for instructions.
:info:build make[3]: *** [s-selftest] Error 1
:info:build make[3]: Leaving directory `/Users/cfry/var/macports/build/_Users_cfry_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc7/gcc7/work/build/gcc'
:info:build make[2]: *** [all-stage1-gcc] Error 2
:info:build make[2]: Leaving directory `/Users/cfry/var/macports/build/_Users_cfry_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc7/gcc7/work/build'
:info:build make[1]: *** [stage1-bubble] Error 2
:info:build make[1]: Leaving directory `/Users/cfry/var/macports/build/_Users_cfry_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc7/gcc7/work/build'
:info:build make: *** [bootstrap-lean] Error 2
:info:build make: Leaving directory `/Users/cfry/var/macports/build/_Users_cfry_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc7/gcc7/work/build'
:info:build Command failed:  cd "/Users/cfry/var/macports/build/_Users_cfry_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc7/gcc7/work/build" && /usr/bin/make -j4 -w bootstrap-lean 
:info:build Exit code: 2

[chucko58 (Chuck Fry)]

Gzipped log of the gcc7 build, with tracing enabled.

[chucko58 (Chuck Fry)]

We have an old version of XCode installed on this machine. I am going to pursue updating it with our local system support people.

razor:~ cfry$ clang --version
Apple LLVM version 8.0.0 (clang-800.0.38)
Target: x86_64-apple-darwin16.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
razor:~ cfry$ 

[kencu (Ken)]

Apparently that error indicates your processor is trying to run instructions that it can't understand:

<​https://stackoverflow.com/questions/14268887/what-is-the-illegal-instruction-4-error-and-why-does-mmacosx-version-min-10>

Some instruction set has become enabled that your processor is not able to run, some linked library like gmp built on another processor but moved onto your machine somehow, some misconfiguration in mmacosx-version-min, etc?

[chucko58 (Chuck Fry)]

The problem apparently resulted from restoring a copy of MacPorts from a backup of a 2015 MacBook Pro to a 2010 model. Rebuilding from scratch resolved the issue. Please close this ticket as invalid.