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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/50378] MALLOC_CHECK_ glibc detects free() invalid pointer in compiler
Date: Wed, 14 Sep 2011 09:12:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50378

--- Comment #9 from Tobias Burnus <burnus at gcc dot gnu.org> 2011-09-14 08:50:04 UTC ---
(In reply to comment #8)
> x86_64-unknown-linux-gnu/4.7.0/f951:
> symbol lookup error:
> undefined symbol: mpfr_get_z_exp
> 
> Never got this one, I have mpfr-3.0.0-4

See http://www.mpfr.org/mpfr-3.0.0/#changes and
http://www.mpfr.org/mpfr-3.0.1/mpfr.html#Changed-Functions

"mpfr_get_z_exp changed in MPFR 3.0 [...] this function has been renamed to
mpfr_get_z_2exp in MPFR 3.0" and "mpfr_get_z_exp is still available via a macro
in mpfr.h".

Seemingly, you have a f951 which has been compiled with MPFR 2.x but you run it
with MPFR 3. In that case, the macro does not help.

gfortran calls this function for real-to-integer conversions, which seems to be
the only use.