Re: f951: internal compiler error: Illegal instruction: 4 when installing packages

Again, thank you for your help.

First, since building from source using the command 'brew reinstall
--build-from-source gcc' did not work I looked for other ways and found a
video to build gcc-10 from source 
https://www.youtube.com/watch?v=GUa9w5rn3a8
<https://www.youtube.com/watch?v=GUa9w5rn3a8>  . I followed it and it took
many many hours to build. During the process several warnings occurred.
However, I did not take notes which ones. Still, when installing the
statistics package it resulted in the same error.

Then, after reading your answer I tried what you said. Specifically, I run
'brew reinstall --build-from-source gmp isl libmpc mpfr' which resulted in 
/% brew reinstall --build-from-source gmp isl libmpc mpfr
==> Downloading https://gmplib.org/download/gmp/gmp-6.2.1.tar.xz
Already downloaded:
/Users/Manuel/Library/Caches/Homebrew/downloads/ade51fddb351cd85e1645e43543cff053bc2f667ec8a7eb1c7554ac301a30d4b--gmp-6.2.1.tar.xz
==> Reinstalling gmp 
==> ./configure --prefix=/usr/local/Cellar/gmp/6.2.1
--libdir=/usr/local/Cellar/
==> make
==> make check
Last 15 lines from /Users/Manuel/Library/Logs/Homebrew/gmp/03.make:
# SKIP:  0
# XFAIL: 0
# FAIL:  6
# XPASS: 0
# ERROR: 0
============================================================================
See tests/mpz/test-suite.log
Please report to [email protected], see
https://gmplib.org/manual/Reporting-Bugs.html
============================================================================
make[5]: *** [test-suite.log] Error 1
make[4]: *** [check-TESTS] Error 2
make[3]: *** [check-am] Error 2
make[2]: *** [check-recursive] Error 1
make[1]: *** [check-recursive] Error 1
make: *** [check] Error 2

READ THIS: https://docs.brew.sh/Troubleshooting/

Obviously something is not working here as well. However, for completeness I
tried 'brew reinstall --build-from-source gcc' which resulted in 

/% brew reinstall --build-from-source gcc
==> Downloading
https://raw.githubusercontent.com/Homebrew/formula-patches/6a83f36d/gcc/bigsur_2.patch
Already downloaded:
/Users/Manuel/Library/Caches/Homebrew/downloads/c0b9dca392d2e8496747001f634c04a4bc2f5c63672b963f3c4f217e70aaa258--bigsur_2.patch
==> Downloading https://ftp.gnu.org/gnu/gcc/gcc-10.2.0/gcc-10.2.0.tar.xz
Already downloaded:
/Users/Manuel/Library/Caches/Homebrew/downloads/c8d4ca732a98ae691d04472b15de6d9e06a09016499af6ff16c4f55081bfc6b9--gcc-10.2.0.tar.xz
==> Reinstalling gcc 
==> Patching
==> Applying bigsur_2.patch
patching file gcc/config/host-darwin.c
patching file gcc/config/darwin-c.c
patching file gcc/config/darwin-driver.c
patching file gcc/testsuite/gcc.dg/darwin-minversion-link.c
patching file gcc/config/darwin-driver.c
patching file gcc/config/darwin-driver.c
patching file libsanitizer/configure.tgt
patching file gcc/configure
Hunk #1 succeeded at 15485 (offset -5 lines).
patching file libatomic/configure
patching file libbacktrace/configure
patching file libcc1/Makefile.am
patching file libcc1/Makefile.in
patching file libcc1/configure
patching file libcc1/configure.ac
patching file libffi/configure
patching file libgfortran/configure
patching file libgomp/Makefile.in
patching file libgomp/configure
patching file libhsail-rt/configure
patching file libitm/configure
patching file libitm/configure.tgt
patching file libobjc/configure
patching file libphobos/configure
patching file libquadmath/configure
patching file libsanitizer/configure
patching file libsanitizer/configure.tgt
patching file libssp/configure
patching file libstdc++-v3/configure
patching file libtool.m4
patching file libvtv/configure
patching file zlib/configure
==> ../configure --prefix=/usr/local/Cellar/gcc/10.2.0_4
--libdir=/usr/local/Cellar/gcc/10.2.0_4/lib/gcc/10 --disable-nls
--enable-checking=rel
==> make BOOT_LDFLAGS=-Wl,-headerpad_max_install_names
Last 15 lines from /Users/Manuel/Library/Logs/Homebrew/gcc/02.make:
/bin/sh ../../gcc/../move-if-change tmp-opinit.h insn-opinit.h
/bin/sh ../../gcc/../move-if-change tmp-opinit.c insn-opinit.c
echo timestamp > s-opinit
build/genattrtab ../../gcc/common.md ../../gcc/config/i386/i386.md
insn-conditions.md \
		-Atmp-attrtab.c -Dtmp-dfatab.c -Ltmp-latencytab.c
build/genautomata ../../gcc/common.md ../../gcc/config/i386/i386.md \
	  insn-conditions.md > tmp-automata.c
make[3]: *** [s-attrtab] Illegal instruction: 4
make[3]: *** Waiting for unfinished jobs....
/bin/sh ../../gcc/../move-if-change tmp-automata.c insn-automata.c
echo timestamp > s-automata
rm gcc.pod
make[2]: *** [all-stage1-gcc] Error 2
make[1]: *** [stage1-bubble] Error 2
make: *** [all] Error 2

READ THIS: https://docs.brew.sh/Troubleshooting

These open issues may also help:
gcc 10.3.0 https://github.com/Homebrew/homebrew-core/pull/74843/

Finally, trying to install the statistics package in Octave resulted in the
same error as before.

I am very thankful for any additional tips I could try to get it working. Do
you know if there is a way to maybe build gcc explicitly for the processor I
am using?

Furthermore, I searched for 'f951' in /usr/local where I actually found 3
exec. 
One in //usr/local/gfortran/libexec/gcc/x86_64-apple-darwin15/6.1.0/f951/
A second one in
//usr/local/gcc-10/libexec/gcc/x86_64-apple-darwin19.6.0/11.0.1/f951/
And a third one in
//usr/local/Cellar/gcc/10.2.0_4/libexec/gcc/x86_64-apple-darwin19/10.2.0/f951/

Although I am far from being an expert in this matter I believe that maybe
this could cause the error? I.e. that I have the same exec in three
different directories?  

Thank you
Manuel



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