[Bug bootstrap/17835] New: stage2 compiler is broken because it is built with -fomit-frame-pointer

[rschiele at uni-mannheim dot de]

When configuring a compiler for i586-linux, bootstrapping fails at: 
 
./xgcc -B./ -B/usr/local/i586-linux/bin/ -isystem /usr/local/i586-linux/include 
-isystem /usr/local/i586-linux/sys-include -L/home/robert/gcc/build/gcc/../ld 
-O2  -DIN_GCC    -W -Wall -Wwrite-strings -Wstrict-prototypes 
-Wmissing-prototypes -Wold-style-definition  -isystem ./include  -fPIC -g 
-DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED  -I. -I. 
-I../../gcc/gcc -I../../gcc/gcc/. -I../../gcc/gcc/../include 
-I../../gcc/gcc/../libcpp/include  -DL_gcov_execl -c ../../gcc/gcc/libgcov.c -o 
libgcc/./_gcov_execl.o 
../../gcc/gcc/libgcov.c: In function '__gcov_execl': 
../../gcc/gcc/libgcov.c:613: internal compiler error: Segmentation fault 
Please submit a full bug report, 
with preprocessed source if appropriate. 
See <URL:http://gcc.gnu.org/bugs.html> for instructions. 
 
in stage2. 
 
I found that this happens when stage2 compiler is built with 
-fomit-frame-pointer, as it is default for this configuration 
(config/mh-x86omitfp). When this option is removed, bootstrapping is fine. 
 
It seems that -fomit-frame-pointer does produce wrong-code when building stage2 
compiler and thus stage2 compiler is broken. 
 
Note that this does neither happen for i486-linux, nor for i686-linux, only for 
i586-linux. Because of that it is essential to specify i586 explicitly when 
trying to reproduce.

-- 
           Summary: stage2 compiler is broken because it is built with -
                    fomit-frame-pointer
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: bootstrap
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rschiele at uni-mannheim dot de
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i586-pc-linux-gnu
  GCC host triplet: i586-pc-linux-gnu
GCC target triplet: i586-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17835