GDB problem accessing static variables in C


 
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Old 09-08-2014
GDB problem accessing static variables in C

Hi,
Can anyone explain this please..... This is on AIX with GDB (tried a few versions). It only happens when program compiled in 64 bit and only with static variables....

A simple test program...

### snip
#include <stdio.h>

main() {
static int n;

n = 6;

printf("hello %d\n", n);
n=7;
}
### snip

64 bit compile/link....


$ export OBJECT_MODE=64
$ cc -g -o hello hello.c
$ gdb ./hello
(gdb) b 8
Breakpoint 1 at 0x1000004a4: file hello.c, line 8.
(gdb) r
Starting program: /src/kiwi_7.94_01oct2014/hello

Breakpoint 1, main () at hello.c:8
8 printf("hello %d\n", n);
(gdb) p n
Cannot access memory at address 0x10000708
(gdb)

If you take off the "static" on line 4, it works fine.

Also it works fine in 32 bit mode.
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GDBINIT(5)						       GNU Development Tools							GDBINIT(5)

NAME
gdbinit - GDB initialization scripts SYNOPSIS
/etc/gdbinit ~/.gdbinit ./.gdbinit DESCRIPTION
These files contain GDB commands to automatically execute during GDB startup. The lines of contents are canned sequences of commands, described in the GDB manual in node "Sequences" -- shell command "info -f gdb -n Sequences". Please read more in the GDB manual in node "Startup" -- shell command "info -f gdb -n Startup". /etc/gdbinit System-wide initialization file. It is executed unless user specified GDB option "-nx" or "-n". See more in the GDB manual in node "System-wide configuration" -- shell command "info -f gdb -n 'System-wide configuration'". ~/.gdbinit User initialization file. It is executed unless user specified GDB options "-nx", "-n" or "-nh". ./.gdbinit Initialization file for current directory. It may need to be enabled with GDB security command "set auto-load local-gdbinit". See more in the GDB manual in node "Init File in the Current Directory" -- shell command "info -f gdb -n 'Init File in the Current Directory'". OPTIONS
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gdb(1), "info -f gdb -n Startup" The full documentation for GDB is maintained as a Texinfo manual. If the "info" and "gdb" programs and GDB's Texinfo documentation are properly installed at your site, the command info gdb should give you access to the complete manual. Using GDB: A Guide to the GNU Source-Level Debugger, Richard M. Stallman and Roland H. Pesch, July 1991. COPYRIGHT
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