[Bug bootstrap/11593] New: [3.4 regression] infinite loop in find_rgns compiling c-parse.c

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

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11593

           Summary: [3.4 regression] infinite loop in find_rgns compiling c-
                    parse.c
           Product: gcc
           Version: 3.4
            Status: UNCONFIRMED
          Severity: critical
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: danglin at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: hppa64-hp-hpux11.11
  GCC host triplet: hppa64-hp-hpux11.11
GCC target triplet: hppa64-hp-hpux11.11

stage1/xgcc -Bstage1/ -B/opt/gnu64/hppa64-hp-hpux11.11/bin/   -g -O2 -DIN_GCC
-W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -pedantic -Wno
-long-long -Werror -fno-common -Wno-error  -DHAVE_CONFIG_H    -I. -I. -I../../gc
c/gcc -I../../gcc/gcc/. -I../../gcc/gcc/config -I../../gcc/gcc/../include  \
       -c ../../gcc/gcc/c-parse.c -o c-parse.o
/opt/gnu/share/bison/bison.simple: In function `yyparse':
/opt/gnu/share/bison/bison.simple:923: warning: label `yyoverflowlab' defined bu
t not used
xgcc: Internal error: Quit (program cc1)

When compiling c_parse_file, a call is made find_rgns with out_edges[0] == 0.
This results in the infinite loop.  This occurs in the while (1) loop.

This problem has been introduced in the last couple of days.