PR 24207 may interest you

[Dominique Dhumieres]

With the patch the compilation of fds reaches:

gfortran -c -O3 -ffast-math -funroll-loops mods.f
gfortran -c -O3 -ffast-math -funroll-loops pois.f
gfortran -c -O3 -ffast-math -funroll-loops misc.f
gfortran -c -O3 -ffast-math -funroll-loops radi.f
gfortran -c -O3 -ffast-math -funroll-loops sprk.f
sprk.f: In function 'insert_droplets':
sprk.f:528: internal compiler error: in fold_convert, at fold-const.c:2028
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
make: *** [sprk.o] Error 1

Dominique