Gdb shows wrong line numbers for the sourcecode

Gdb shows wrong line numbers for the sourcecode

[Josef Wolf]

Hello,

I have built a toolchain for ARM Cortex-M3 based on

binutils-2.20
gcc-4.4.3
gdb-6.0
openocd-0.4.0

With this combination, gdb shows wrong line numbers and wrong lines in the
source listings and in the backtrace like this:

 (gdb) bt
 #0  0x080004a6 in main (argc=536891392, argv=0x20005000) at main.c:45
 (gdb) cont
 Continuing.
 
 Breakpoint 2, 0x080003a4 in send_char (ch=19 '\023') at main.c:45
 45              while (RCC_GetFlagStatus (RCC_FLAG_PLLRDY) == RESET) {
 (gdb) bt
 #0  0x080003a4 in send_char (ch=19 '\023') at main.c:45
 #1  0x080004ca in main (argc=536891392, argv=0x20005000) at main.c:45

In reality, the main function begins at line 91 and the send_char function
begins at line 84. The source code line shown at the breakpoint is a totally
different function.

Any ideas what could cause gdb to get confused?

Re: Gdb shows wrong line numbers for the sourcecode

[Paul Koning]

Probably the fact that your GDB is an antique.

I found that a version of GDB not nearly so out of date was unuseable with current GCC.  Updated to the current (7.2) and all is well.

	paul

On Jun 20, 2011, at 1:39 PM, Josef Wolf wrote:

> Hello,
> 
> I have built a toolchain for ARM Cortex-M3 based on
> 
> binutils-2.20
> gcc-4.4.3
> gdb-6.0
> openocd-0.4.0
> 
> With this combination, gdb shows wrong line numbers and wrong lines in the
> source listings and in the backtrace like this:
> 
> (gdb) bt
> #0  0x080004a6 in main (argc=536891392, argv=0x20005000) at main.c:45
> (gdb) cont
> Continuing.
> 
> Breakpoint 2, 0x080003a4 in send_char (ch=19 '\023') at main.c:45
> 45              while (RCC_GetFlagStatus (RCC_FLAG_PLLRDY) == RESET) {
> (gdb) bt
> #0  0x080003a4 in send_char (ch=19 '\023') at main.c:45
> #1  0x080004ca in main (argc=536891392, argv=0x20005000) at main.c:45
> 
> In reality, the main function begins at line 91 and the send_char function
> begins at line 84. The source code line shown at the breakpoint is a totally
> different function.
> 
> Any ideas what could cause gdb to get confused?

Re: Gdb shows wrong line numbers for the sourcecode

[Josef Wolf]

On Mon, Jun 20, 2011 at 02:31:11PM -0400, Paul Koning wrote:
> Probably the fact that your GDB is an antique.
> 
> I found that a version of GDB not nearly so out of date was unuseable with current GCC.  Updated to the current (7.2) and all is well.

ARGH!

Thanks for the hint, Paul!

Actually, I _had_ built gdb-7.2. But after that, I built insight-6.8-1 (that's
the latest available version of insight, AFAIK). And insight installed the old
gdb over the new one :-/ (that I wrote 6.0 instead of 6.8 was just a typo).

Now I kicked insight 6.8-1 into the trash can and rebuilt gdb-7.2 and
everything looks good so far.

Thanks!