[Bug gcov/profile/21810] New: -pg causes libexpat code to crash

["oliverst at online dot de" <gcc-bugzilla at gcc dot gnu dot org>]

When you compile a program with "-pg" against libexpat 1.95.8 and you call
XML_ParserCreate() it does crash. this is not happening, if you don't add "-pg".

The source I used was distributed with the official MAME source code package
(http://www.mame.net/downmain.html - win32 sourcecode, but the related source
should be platform-independent). The easiest way to test it, is just to compile
the "xml2info" tool, that part is of MAME, add "-pg" to compiler and linkers
flags and run it, it will crash immediately.

Here is the backtrace:

Program received signal SIGSEGV, Segmentation fault.
0x0040e456 in poolInit (pool=0x40e44d, ms=0x0) at src/expat/xmlparse.c:5874
5874      pool->blocks = NULL;
(gdb) bt
#0  0x0040e456 in poolInit (pool=0x40e44d, ms=0x0) at src/expat/xmlparse.c:5874
#1  0x0040d339 in dtdCreate (ms=0x3f2554) at src/expat/xmlparse.c:5428
#2  0x00403193 in parserCreate (encodingName=0x0, memsuite=0x0, nameSep=0x0,
    dtd=0x0) at src/expat/xmlparse.c:737
#3  0x00402fb7 in XML_ParserCreate_MM (encodingName=0x0, memsuite=0x0,
    nameSep=0x0) at src/expat/xmlparse.c:671
#4  0x00402f4b in XML_ParserCreate (encodingName=0x0)
    at src/expat/xmlparse.c:648
#5  0x00402b7c in process (is=0x7803a690, os=0x7803a6b0) at src/xml2info.c:766
#6  0x00402efe in main (argc=1, argv=0x3f24c8) at src/xml2info.c:835

My GCC version:

Reading specs from C:/MINGW/BIN/../lib/gcc/mingw32/3.4.2/specs
Configured with: ../gcc/configure --with-gcc --with-gnu-ld --with-gnu-as --host=
mingw32 --target=mingw32 --prefix=/mingw --enable-threads --disable-nls --enable
-languages=c,c++,f77,ada,objc,java --disable-win32-registry --disable-shared --e
nable-sjlj-exceptions --enable-libgcj --disable-java-awt --without-x --enable-ja
va-gc=boehm --disable-libgcj-debug --enable-interpreter --enable-hash-synchroniz
ation --enable-libstdcxx-debug
Thread model: win32
gcc version 3.4.2 (mingw-special)

-- 
           Summary: -pg causes libexpat code to crash
           Product: gcc
           Version: 3.4.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gcov/profile
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: oliverst at online dot de
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21810