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[Bug c++/26120] New: mudlap behavior changes with trivial changes to build command
- From: "idht4n at hotmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 6 Feb 2006 10:18:41 -0000
- Subject: [Bug c++/26120] New: mudlap behavior changes with trivial changes to build command
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
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