https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66563
--- Comment #7 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> --- Alright, I did some further tests. I downloaded the source package for "wmfire" with "apt-get source wmfire" and installed its build dependencies with "apt-get build-dep wmfire". Then I just tried to compile "wmfire.c": glaubitz@tirpitz:~/debian/segfault-test/wmfire-1.2.4/src$ gcc wmfire.c -o wmfire.o $(pkg-config --cflags gdk-2.0) $(pkg-config --cflags libgtop-2.0) wmfire.c: In function ‘draw_fire’: wmfire.c:559:6: internal compiler error: Segmentation fault psi = i * 3.14 / 20.0; ^ Please submit a full bug report, with preprocessed source if appropriate. See <file:///usr/share/doc/gcc-4.9/README.Bugs> for instructions. Preprocessed source stored into /tmp/ccSeTi7v.out file, please attach this to your bugreport. glaubitz@tirpitz:~/debian/segfault-test/wmfire-1.2.4/src$ I did a second run with strace: glaubitz@tirpitz:~/debian/segfault-test/wmfire-1.2.4/src$ strace -o gcc-segfault-wmfire gcc wmfire.c -o wmfire.o $(pkg-config --cflags gdk-2.0) $(pkg-config --cflags libgtop-2.0) wmfire.c: In function ‘draw_fire’: wmfire.c:559:6: internal compiler error: Segmentation fault psi = i * 3.14 / 20.0; ^ Please submit a full bug report, with preprocessed source if appropriate. See <file:///usr/share/doc/gcc-4.9/README.Bugs> for instructions. Preprocessed source stored into /tmp/cchKm9Ad.out file, please attach this to your bugreport. glaubitz@tirpitz:~/debian/segfault-test/wmfire-1.2.4/src$ Attaching the strace output as well as the preprocessed source. Adrian