possible miscompilation on macOS Catalina 10.15.6

[Torbjörn Granlund]

Trevor Spiteri <tspiteri at ieee.org> writes:

  I maintain Rust language bindings to GMP and got a bug report from a
  user on macOS Catalina 10.15.6.  I do not know if this issue is caused
  by the particular system setup of the user or if it is more general, so
  I'm listing what information I have in case it is actually reproducible
  in a more general setting.

  The bindings compilation process compiles GMP using:

  ln -s path/to/extracted/gmp-6.2.0 gmp-src
  mkdir gmp-build
  cd gmp-build
  ../gmp-src/configure --enable-fat --disable-shared --with-pic
  make -j 8
  make -j 8 check

  The make check is failing and outputting this on standard error:

  ../../../gmp-src/test-driver: line 107: 4825 Segmentation fault: 11 "$@"
  > $log_file 2>&1
  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

  I don't have standard output, so I don't know which test actually failed.

  This is all the information I got; sorry if it is incomplete. (The
  user's issue was solved by using their already installed homebrew?
  libraries instead of compiling GMP anew.)

OK, so *some* compiler compiled GMP with and *some* GMP test program
reported a segfault.  I will right away start the natural deduction over
all possible instances of compilers and GMP test cases. Oh wait, I need
to consider all possible CPUs and relevant environment variables as
well.


-- 
Torbjörn
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