Description of problem:
Macaulay2 sometimes crashes with backtraces that include calls into mpfr.  The Macaulay2 developers identified the problem:

  "Compiling mpfr with thread local variables is incompatible with libgc,
   because some libgc pointers are cached in the variables
   gmpfr_cache_const_pi, __gmpfr_cache_const_log2, __gmpfr_cache_const_euler,
   __gmpfr_cache_const_catalan."

They say that Macaulay2 must be linked with an mpfr that has been configured with --disable-thread-safe.  We do not have such a library in Fedora.  Is it possible that two versions of the mpfr library could be built, the optimized one as now, and also perhaps libmpfr-gc.so.<version>?

Note that this will also be a problem for any other application that uses both mpfr and gc.  (Not that I know that there are any such applications...)

Version-Release number of selected component (if applicable):
mpfr-3.1.2-8.fc22.x86_64

How reproducible:
Sometimes.

Steps to Reproduce:
1. Run the Macaulay2 test suite
2.
3.

Actual results:
Sometimes the test suite completes normally, sometimes it segfaults with a backtrace that includes mpfr calls.

Expected results:
Normal completion, always.

Additional info: