[Bug bootstrap/54926] New: [4.8 Regression] Bootstrap comparison failure for various files in libbacktrace

[danglin at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54926

             Bug #: 54926
           Summary: [4.8 Regression] Bootstrap comparison failure for
                    various files in libbacktrace
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: danglin@gcc.gnu.org
                CC: uros@gcc.gnu.org
              Host: hppa2.0w-hp-hpux11.11
            Target: hppa2.0w-hp-hpux11.11
             Build: hppa2.0w-hp-hpux11.11


Bootstrap comparison failure!
libbacktrace/.libs/dwarf.o differs
libbacktrace/.libs/fileline.o differs
libbacktrace/.libs/posix.o differs
libbacktrace/.libs/print.o differs
libbacktrace/.libs/state.o differs
libbacktrace/.libs/backtrace.o differs
libbacktrace/.libs/simple.o differs
libbacktrace/.libs/unknown.o differs
libbacktrace/.libs/mmapio.o differs
libbacktrace/.libs/mmap.o differs
make[2]: *** [compare] Error 1
make[2]: Leaving directory `/test/gnu/gcc/objdir'
make[1]: *** [stage3-bubble] Error 2
make[1]: Leaving directory `/test/gnu/gcc/objdir'
make: *** [bootstrap] Error 2
Sun Oct 14 17:26:48 EDT 2012

# ./xgcc -B./ -v
Reading specs from ./specs
COLLECT_GCC=./xgcc
COLLECT_LTO_WRAPPER=./lto-wrapper
Target: hppa2.0w-hp-hpux11.11
Configured with: ../gcc/configure --with-gnu-as --with-as=/opt/gnu/bin/as
--enable-shared --with-local-prefix=/opt/gnu --prefix=/opt/gnu/gcc/gcc-4.8
--with-gmp=/opt/gnu/gcc/gmp --enable-threads=posix --enable-debug=no
--disable-nls --disable-lto --without-cloog --without-ppl
--enable-languages=c,c++,objc,fortran,java,ada,obj-c++
Thread model: posix
gcc version 4.8.0 20121014 (experimental) [trunk revision 192432] (GCC) 

Problem was introduced in r191981.

# od -c stage3-libbacktrace/.libs/mmap.o >mmap.o.dump3                 
# od -c stage2-libbacktrace/.libs/mmap.o >mmap.o.dump2
# /opt/gnu/bin/diff -u mmap.o.dump2 mmap.o.dump3|less 
--- mmap.o.dump2        Sun Oct 14 18:11:19 2012
+++ mmap.o.dump3        Sun Oct 14 18:11:06 2012
@@ -1427,7 +1427,7 @@
 0054440   B   A   L   _   _   F   _   .   .   _   .   .   _   g   c   c
 0054460   _   l   i   b   b   a   c   k   t   r   a   c   e   _   m   m
 0054500   a   p   .   c   _   5   6   A   F   5   6   2   3   _   0   x
-0054520   6   0   3   1   b   f   a   b  \0  \0  \0  \0  \0  \0  \0 006
+0054520   6   0   b   7   9   d   9   8  \0  \0  \0  \0  \0  \0  \0 006
 0054540   $   D   A   T   A   $  \0  \0  \0  \0  \0 006   $   C   O   D
 0054560   E   $  \0  \0  \0  \0  \0 006   $   C   O   D   E   $  \0  \0
 0054600  \0  \0  \0 006   $   C   O   D   E   $  \0  \0  \0  \0  \0 006

# nm stage3-libbacktrace/.libs/mmap.o >mmap.o.dump3   
# nm stage2-libbacktrace/.libs/mmap.o >mmap.o.dump2
# /opt/gnu/bin/diff -u mmap.o.dump2 mmap.o.dump3|less
--- mmap.o.dump2        Sun Oct 14 18:13:24 2012
+++ mmap.o.dump3        Sun Oct 14 18:13:14 2012
@@ -6,7 +6,7 @@
 00000000 t $CODE$
 00000000 t $CODE$
 40000000 d $DATA$
-40000000 D _GLOBAL__F_.._.._gcc_libbacktrace_mmap.c_56AF5623_0x6031bfab
+40000000 D _GLOBAL__F_.._.._gcc_libbacktrace_mmap.c_56AF5623_0x60b79d98
          U abort
 00000000 T backtrace_alloc
 00000000 T backtrace_free

Problem is random destructor symbol names in files.