$ cat test.c struct R { char c; } struct R { struct R r; }
int main(void) { struct R r; return 0; } $ gcc test.c test.c:7: error: redefinition of struct R test.c:11: error: two or more data types in declaration specifiers test.c:11: error: two or more data types in declaration specifiers test.c: In function main: test.c:15: error: incompatible types in return test.c:12: warning: return type of main is not int gcc: Internal error: Segmentation fault (program cc1) Please submit a full bug report. See <URL:http://gcc.gnu.org/bugs.html> for instructions. For Debian GNU/Linux specific bug reporting instructions, see <URL:file:///usr/share/doc/gcc-4.2/README.Bugs>. $ gcc -v Using built-in specs. Target: i486-linux-gnu Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.2 --program-suffix=-4.2 --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-mpfr --enable-targets=all --enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu Thread model: posix $ cat test.i # 1 "test.c" # 1 "<built-in>" # 1 "<command-line>" # 1 "test.c" struct R { char c; } struct R { struct R r; } int main(void) { struct R r; return 0; } -- Summary: SEG fault on redefinition of struct error Product: gcc Version: 4.2.4 Status: UNCONFIRMED Severity: minor Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: tor_rustad at hotmail dot com GCC build triplet: i486-linux-gnu GCC host triplet: i486-linux-gnu GCC target triplet: i486-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40476