Bah, I hit the wrong button, answer went only to Dan. Am 31.05.20 um 01:45 schrieb Manfred Schwarb: > Am 30.05.20 um 04:01 schrieb Dan Kegel: >> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95090 looks sorted, did you >> figure out your gdb question? >> > > Bug is sorted now, but debugging with printf's is a bit tedious ... > So no, gdb question is not resolved. The issue is, I can't change frames > or list code in GDB somehow. > > >> On Fri, May 29, 2020, 16:55 Manfred Schwarb <manfred99@xxxxxx> wrote: >> >>> Hi, >>> I tried to debug fortran.dg/pr95090.f90, which showed >>> >>> f951: internal compiler error: Segmentation fault >>> 0x83cfe3c ??? >>> ../sysdeps/i386/start.S:117 >>> Please submit a full bug report, >>> with preprocessed source if appropriate. >>> Please include the complete backtrace with any bug report. >>> See <https://gcc.gnu.org/bugs/> for instructions. >>> >>> >>> Using GDB (8.3.1), I got >>> #> f951="`$instdir/bin/gcc -print-prog-name=f951`" >>> #> gdb -ex run -ex bt --batch --args $f951 fortran.dg/pr95090.f90 >>> >>> Program received signal SIGSEGV, Segmentation fault. >>> 0xf7aa5162 in __strlen_sse2_bsf () from /lib/libc.so.6 >>> #0 0xf7aa5162 in __strlen_sse2_bsf () from /lib/libc.so.6 >>> #1 0x083e7c3f in get_unique_hashed_string(char*, gfc_symbol*) () >>> #2 0x083e85a4 in gfc_find_derived_vtab(gfc_symbol*) () >>> #3 0x0847fde1 in resolve_fl_derived(gfc_symbol*) () >>> #4 0x0847c717 in resolve_symbol(gfc_symbol*) () >>> #5 0x084a78d0 in do_traverse_symtree(gfc_symtree*, void >>> (*)(gfc_symtree*), void (*)(gfc_symbol*)) () >>> #6 0x08487f77 in resolve_types(gfc_namespace*) () >>> #7 0x0847b6e5 in gfc_resolve(gfc_namespace*) () >>> #8 0x0846e9f6 in gfc_parse_file() () >>> #9 0x084bebe7 in gfc_be_parse_file() () >>> #10 0x08a3b59e in compile_file() () >>> #11 0x083c98a5 in toplev::main(int, char**) () >>> #12 0x083cd9b1 in main () >>> >>> >>> So far so good, but there are no file locations shown, and I can't >>> switch frames and list code in GDB. >>> This although I built GCC with debug information and binaries are not >>> stripped. >>> >>> I built GCC with >>> #> ../configure --enable-checking=yes,extra i686-linux >>> #> make BOOT_CFLAGS="-O2 -ggdb" bootstrap2-lean >>> >>> In desperation, I even tried >>> #> make BOOT_CFLAGS="-O2 -fanalyzer" bootstrap2-lean >>> and >>> #> make BOOT_CFLAGS="-O2 -fsanitize=address" bootstrap2-lean >>> but both compilation attempts failed. >>> >>> >>> Are there any magic knobs to make GDB output more useful? >>> >>> Thanks, >>> Manfred >>> >>> >>> >> >
