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Subject: [Bug libfortran/54012] printf crash with -lgfortran
Date: Tue, 30 Oct 2012 22:04:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54012

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |burnus at gcc dot gnu.org

--- Comment #10 from Tobias Burnus <burnus at gcc dot gnu.org> 2012-10-30 22:04:33 UTC ---
(In reply to comment #9)
>   "ldd bad":
>         linux-vdso.so.1 =>  (0x00007fffd97ff000)
>         libquadmath.so.0 => /usr/lib64/libquadmath.so.0 (0x00007f74e80ec000)

Could you try linking libquadmath directly instead of libgfortran (which
implies libquadmath)?


The reason is that libquadmath installs, if possible, GLIBC's printf hooks, cf.
http://gcc.gnu.org/onlinedocs/libquadmath/quadmath_005fsnprintf.html
and the source code at
http://gcc.gnu.org/viewcvs/trunk/libquadmath/printf/quadmath-printf.c?view=markup

With those hooks, "printf("%Qe\n", float128_number)" will work. In principle,
it shouldn't cause those issues, but depending on the GLIBC version it might.


(If libquadmath is the cause, it also explains that it works with -static as
libgfortran only statically links libquadmath if needed.)