[Bug rtl-optimization/52524] New: Segfault compiling libgcov.c

["vries at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52524

             Bug #: 52524
           Summary: Segfault compiling libgcov.c
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: vries@gcc.gnu.org


with revision r185025, I ran into this build breaker:
...
/home/vries/gcc_versions/devel/lean/build/./gcc/xgcc
-B/home/vries/gcc_versions/devel/lean/build/./gcc/
-B/home/vries/gcc_versions/devel/lean/install/x86_64-unknown-linux-gnu/bin/
-B/home/vries/gcc_versions/devel/lean/install/x86_64-unknown-linux-gnu/lib/
-isystem
/home/vries/gcc_versions/devel/lean/install/x86_64-unknown-linux-gnu/include
-isystem
/home/vries/gcc_versions/devel/lean/install/x86_64-unknown-linux-gnu/sys-include
   -g -O2 -m32 -O2  -g -O2 -DIN_GCC   -W -Wall -Wwrite-strings -Wcast-qual
-Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem
./include   -fpic -g -DIN_LIBGCC2 -fbuilding-libgcc -fno-stack-protector  
-fpic -I. -I. -I../../.././gcc -I/home/vries/gcc_versions/devel/src/libgcc
-I/home/vries/gcc_versions/devel/src/libgcc/.
-I/home/vries/gcc_versions/devel/src/libgcc/../gcc
-I/home/vries/gcc_versions/devel/src/libgcc/../include
-I/home/vries/gcc_versions/devel/src/libgcc/config/libbid
-DENABLE_DECIMAL_BID_FORMAT -DHAVE_CC_TLS  -DUSE_TLS -o _gcov.o -MT _gcov.o -MD
-MP -MF _gcov.dep -DL_gcov -c
/home/vries/gcc_versions/devel/src/libgcc/libgcov.c
/home/vries/gcc_versions/devel/src/libgcc/libgcov.c: In function
âfree_fn_dataâ:
/home/vries/gcc_versions/devel/src/libgcc/libgcov.c:158:1: 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.
...

backtrace:
...
Program received signal SIGSEGV, Segmentation fault.
0x0000000000c2a3a8 in for_each_rtx_1 (exp=0x7ffff55270b8, n=0, f=0xa701a6
<returnjump_p_1>, data=0x0) at
/home/vries/gcc_versions/devel/src/gcc/rtlanal.c:2837
2837      for (; format[n] != '\0'; n++)
(gdb) bt
#0  0x0000000000c2a3a8 in for_each_rtx_1 (exp=0x7ffff55270b8, n=0, f=0xa701a6
<returnjump_p_1>, data=0x0) at
/home/vries/gcc_versions/devel/src/gcc/rtlanal.c:2837
#1  0x0000000000c29fce in for_each_rtx_1 (exp=0x7ffff5360ba0, n=0, f=0xa701a6
<returnjump_p_1>, data=0x0) at
/home/vries/gcc_versions/devel/src/gcc/rtlanal.c:2859
#2  0x0000000000c2a45b in for_each_rtx (x=0x7ffff57021b8, f=0xa701a6
<returnjump_p_1>, data=0x0) at
/home/vries/gcc_versions/devel/src/gcc/rtlanal.c:2940
#3  0x0000000000a7034a in returnjump_p (insn=0x7ffff5702190) at
/home/vries/gcc_versions/devel/src/gcc/jump.c:935
#4  0x000000000069efc9 in patch_jump_insn (insn=0x7ffff5702190,
old_label=0x7ffff53c7870, new_bb=0x7ffff5411820) at
/home/vries/gcc_versions/devel/src/gcc/cfgrtl.c:1036
#5  0x000000000069f231 in redirect_branch_edge (e=0x7ffff5227880,
target=0x7ffff5411820) at /home/vries/gcc_versions/devel/src/gcc/cfgrtl.c:1083
#6  0x000000000069f510 in rtl_redirect_edge_and_branch (e=0x7ffff5227880,
target=0x7ffff5411820) at /home/vries/gcc_versions/devel/src/gcc/cfgrtl.c:1125
#7  0x000000000067f506 in redirect_edge_and_branch (e=0x7ffff5227880,
dest=0x7ffff5411820) at /home/vries/gcc_versions/devel/src/gcc/cfghooks.c:323
#8  0x00000000006a0f46 in rtl_split_edge (edge_in=0x7ffff5227880) at
/home/vries/gcc_versions/devel/src/gcc/cfgrtl.c:1483
#9  0x000000000067fc9f in split_edge (e=0x7ffff5227880) at
/home/vries/gcc_versions/devel/src/gcc/cfghooks.c:551
#10 0x00000000006a1665 in commit_one_edge_insertion (e=0x7ffff5227880) at
/home/vries/gcc_versions/devel/src/gcc/cfgrtl.c:1590
#11 0x000000000067dd21 in gimple_expand_cfg () at
/home/vries/gcc_versions/devel/src/gcc/cfgexpand.c:4576
#12 0x0000000000b08863 in execute_one_pass (pass=0x25f5240) at
/home/vries/gcc_versions/devel/src/gcc/passes.c:2084
#13 0x0000000000b08a51 in execute_pass_list (pass=0x25f5240) at
/home/vries/gcc_versions/devel/src/gcc/passes.c:2139
#14 0x0000000000dc2282 in tree_rest_of_compilation (fndecl=0x7ffff51a1a00) at
/home/vries/gcc_versions/devel/src/gcc/tree-optimize.c:422
#15 0x00000000006c15d5 in cgraph_expand_function (node=0x7ffff51a2ea0) at
/home/vries/gcc_versions/devel/src/gcc/cgraphunit.c:1837
#16 0x00000000006c17a0 in cgraph_expand_all_functions () at
/home/vries/gcc_versions/devel/src/gcc/cgraphunit.c:1904
#17 0x00000000006c22e6 in cgraph_optimize () at
/home/vries/gcc_versions/devel/src/gcc/cgraphunit.c:2218
#18 0x00000000006bf322 in cgraph_finalize_compilation_unit () at
/home/vries/gcc_versions/devel/src/gcc/cgraphunit.c:1344
#19 0x00000000004be2d4 in c_write_global_declarations () at
/home/vries/gcc_versions/devel/src/gcc/c-decl.c:10032
#20 0x0000000000d0efeb in compile_file () at
/home/vries/gcc_versions/devel/src/gcc/toplev.c:573
#21 0x0000000000d112b3 in do_compile () at
/home/vries/gcc_versions/devel/src/gcc/toplev.c:1937
#22 0x0000000000d1142a in toplev_main (argc=78, argv=0x7fffffffd618) at
/home/vries/gcc_versions/devel/src/gcc/toplev.c:2013
#23 0x00000000005c0964 in main (argc=78, argv=0x7fffffffd618) at
/home/vries/gcc_versions/devel/src/gcc/main.c:36
...

compiler configured like this:
...
Target: x86_64-unknown-linux-gnu
Configured with: /home/vries/gcc_versions/devel/src/configure
--prefix=/home/vries/gcc_versions/devel/lean/install
--with-cloog=/home/vries/gcc_versions/infra
--with-ppl=/home/vries/gcc_versions/infra
--with-gmp=/home/vries/gcc_versions/infra
--with-mpfr=/home/vries/gcc_versions/infra
--with-mpc=/home/vries/gcc_versions/infra --disable-bootstrap
--enable-checking=yes,rtl --enable-languages=c,fortran,c++
...

unfortunately, the segfault does not happen with -save-temps, or with the
source produced by -save-temps, so I can't really attach a preprocessed file to
reproduce.