This one has me quite puzzled. Starting between 2007-10-02 and 2007-10-03, I haven't been able to bootstrap with Fortran enabled due to an ICE in the Fortran compiler for very simple testcases:
$ cat foo.f90 integer function foo () end function $ ./f951 foo.f90 foo.f90:1: internal compiler error: Segmentation fault Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. $ ./gfortran -v Using built-in specs. Target: i386-pc-linux-gnu Configured with: ../gfortran_nightbuild/trunk/configure --prefix=/tmp --with-gmp=/home/fx/gfortran_nightbuild/software --enable-languages=c,fortran --build=i386-pc-linux-gnu --enable-checking=release Thread model: posix gcc version 4.3.0 20071005 (experimental) [trunk revision 129029] (GCC) This ICE happens all over libgfortran, which is why it breaks bootstrap. All functions are broken, while subroutines (which return void) work fine. I doubt that we've broken the Fortran front-end so thouroughly that it can't compile any function on i386, yet works fine on all other targets (including i686), so I suppose it is miscompiled. I can get a backtrace: Program received signal SIGSEGV, Segmentation fault. build_function_type (value_type=0x0, arg_types=0x0) at ../../gfortran_nightbuild/trunk/gcc/tree.c:5787 5787 if (TREE_CODE (value_type) == FUNCTION_TYPE) (gdb) bt #0 build_function_type (value_type=0x0, arg_types=0x0) at ../../gfortran_nightbuild/trunk/gcc/tree.c:5787 #1 0x080d9564 in gfc_get_function_type (sym=0x86b7860) at ../../gfortran_nightbuild/trunk/gcc/fortran/trans-types.c:2039 #2 0x080bd975 in build_function_decl (sym=0x86b7860) at ../../gfortran_nightbuild/trunk/gcc/fortran/trans-decl.c:1237 #3 0x080bea12 in gfc_create_function_decl (ns=0x873a4c8) at ../../gfortran_nightbuild/trunk/gcc/fortran/trans-decl.c:1793 #4 0x080bfbf8 in gfc_generate_function_code (ns=0x873a4c8) at ../../gfortran_nightbuild/trunk/gcc/fortran/trans-decl.c:3139 #5 0x08089b02 in gfc_parse_file () at ../../gfortran_nightbuild/trunk/gcc/fortran/parse.c:3384 but I can't get any further, because gdb becomes crazy: (gdb) b gfc_sym_type Breakpoint 1 at 0x80d9288: file ../../gfortran_nightbuild/trunk/gcc/fortran/trans-types.c, line 1539. (gdb) r Starting program: /home/fx/ibin/gcc/f951 a.f90 Warning: Cannot insert breakpoint 1. Error accessing memory address 0x80d9288: Input/output error. Cannot insert breakpoint -3. Temporarily disabling shared library breakpoints: breakpoint #-3 The symbol looks OK, but gfc_sym_type() apparently returns a NULL_TREE, which is not OK. I've followed that code path and function called from there, all the way down to gfc_get_int_type(), and it looks fine. -- Summary: Fortran front-end miscompiled? Product: gcc Version: 4.3.0 Status: UNCONFIRMED Keywords: wrong-code, ice-on-valid-code Severity: normal Priority: P3 Component: middle-end AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: fxcoudert at gcc dot gnu dot org GCC build triplet: i386-pc-linux-gnu GCC host triplet: i386-pc-linux-gnu GCC target triplet: i386-pc-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33679
