https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67680
--- Comment #4 from Brian Plummer <bplummer at hotmail dot com> --- I had these comments in my message, but they got lost when I added my attachment. floatformat.preprocessed.c was created with this command : Brian@MBPWin7-64 ~/gnu/gcc/gcc-5.2.0/libiberty $ gcc -E -c -DHAVE_CONFIG_H -g -I. -I../build/libiberty/ -I../include -W -Wall -Wwrite-strings -Wc++-compat -Wstrict-prototypes -pedantic floatformat.c -o floatformat.preprocessed.c compiling floatformat.preprocessed.c : Brian@MBPWin7-64 ~/gnu/gcc/gcc-5.2.0/libiberty $ gcc -c floatformat.preprocessed.c -o floatformat.o floatformat.c: In function ‘floatformat_to_double’: floatformat.c:529:2: internal compiler error: Segmentation fault dto = ldexp (1.0, exponent); ^ Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. Machine and compiler details are in an earlier post.