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Date: Mon, 06 Feb 2006 10:18:00 -0000
Subject: [Bug c++/26120]  New: mudlap behavior changes with trivial changes to build command
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From: "idht4n at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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The following two build commands yield executables with different mudflap
behavior, which seems like a bug to me:

g++ -c -fmudflap -o hello.o hello.cpp ; g++f4 -o hello hello.o -lmudflap
g++ -fmudflap -o hello hello.cpp -lmudflap 

Here's the source for hello.cpp:

#include <stdio.h>
#include <errno.h>

int main(int argc, char *argv[])
{
errno = 1;
printf("%d %s\n", errno, argv[0]);

printf("Hello, world!\n");
return 0;
}

Using gcc from svn from 2006-02-03:

{65} g++ -c -fmudflap -o hello.o hello.cpp ; g++f4 -o hello hello.o -lmudflap
{66} ./hello
*******
mudflap violation 1 (check/write): time=1139021256.756465 ptr=0xb7e926a0 size=4
pc=0xb7ebc322 location=`hello.cpp:6 (main)'
     /usr/lib/libmudflap.so.0(__mf_check+0x44) [0xb7ebc322]
     ./hello(main+0x92) [0x8048776]
     /lib/tls/libc.so.6(__libc_start_main+0xd3) [0xbdae23]
number of nearby objects: 0
*******
mudflap violation 2 (check/read): time=1139021256.757309 ptr=0xbf898d64 size=4
pc=0xb7ebc322 location=`hello.cpp:7 (main)'
     /usr/lib/libmudflap.so.0(__mf_check+0x44) [0xb7ebc322]
     ./hello(main+0x117) [0x80487fb]
     /lib/tls/libc.so.6(__libc_start_main+0xd3) [0xbdae23]
number of nearby objects: 0
*******
mudflap violation 3 (check/read): time=1139021256.757390 ptr=0xb7e926a0 size=4
pc=0xb7ebc322 location=`hello.cpp:7 (main)'
     /usr/lib/libmudflap.so.0(__mf_check+0x44) [0xb7ebc322]
     ./hello(main+0x1a0) [0x8048884]
     /lib/tls/libc.so.6(__libc_start_main+0xd3) [0xbdae23]
number of nearby objects: 0
1 ./hello
Hello, world!
{67} g++ -fmudflap -o hello hello.cpp -lmudflap
{68} ./hello
1 ./hello
Hello, world!


I built on a P4 running Fedora Core 3 with the svn version of gcc.


-- 
           Summary: mudlap behavior changes with trivial changes to build
                    command
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: idht4n at hotmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26120