Re: C99 variable length arrays

[Igor Khavkine <igor.kh@gmail.com>]

On 1/26/06, Daniel Jacobowitz <drow@false.org> wrote:
> On Thu, Jan 26, 2006 at 08:41:46AM -0500, Igor Khavkine wrote:

> > I'm using GDB to debug some code that uses local variable length
> > arrays. This feature is available for C as of the C99 standard. GCC
> > has support for it.
> >
> > Sadly, GDB doesn't seem to be smart enough to figure out the size of
> > the arrays at run time. This leads to things like 'print array[1][2]'
> > at the GDB prompt not printing the same value as would 'printf("%g\n",
> > array[1][2])' in the code. This is a problem for multidimensional
> > arrays especially. Needless to say, this makes the code more difficult
> > to debug.
>
> The first thing to do is to write a small testcase, and post the
> testcase along with the debugging output that your GCC generates
> for it.

There is a test case already in the GDB bug database (PR 1796, as I
mentioned in my first message). What kind of debugging output should I
post? Is there an option to make gcc dump the debugging info in human
readable form?

Thanks in advance.

Igor