Hi all.
Hopefully this is the right list to report this problem.
To debug our SW, we try to use libgmalloc, as described here:
http://developer.apple.com/technotes/tn2004/tn2124.html
However we encountered troubles with libgmalloc. The following
simple program is good enough to demonstrate it.
/* problem.c */
#include <stdio.h>
int
main(int argc, char** argv)
{
int i;
for(i = 0; i < argc; i++)
printf("argv[%d]: %s\n", i, argv[i]);
return 0;
}
The following commands then lead to a crash:
$ gcc -O2 -fomit-frame-pointer problem.c
$ DYLD_INSERT_LIBRARIES=/usr/lib/libgmalloc.dylib ./a.out foo bar
Allocations will be placed on word (4 byte) boundaries.
- Small buffer overruns may not be noticed.
- Applications using AltiVec instructions may fail.
GuardMalloc-11
Segmentation fault (core dumped)
Backtrace from gdb shows:
#0 0x9b1e7882 in GMmalloc ()
#1 0x900f6b7b in localeconv_l ()
#2 0x9000b201 in __vfprintf ()
#3 0x900e3b50 in vfprintf_l ()
#4 0x9001c90f in printf ()
#5 0x00001f8f in main ()
When not using -fomit-frame-pointer or not using libgmalloc, the program
works as expected.
Our configuration:
- Intel based mac with Mac OS X 10.4.x
- gcc 4.0.1
Is it bug in gcc or in libgmalloc, or is it (documented?) limitation of
libgmalloc? What compiler/linker options can/cannot be used with
libgmalloc?
Any relevant answer or pointer to documentation would be appreciated.
Mity
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