Re: RFA/patch stabs reader: Recognize language hint in SO stab

[Andrew Cagney <cagney@gnu.org>]

> I knew I forgot something:  Testing.

Can this be turned into a proper testcase?  gdb.stabs/ I guess?  The 
last thing we want is to accidently break this.

Andrew

> I tested the patch on an x86 Linux box with gcc 3.4.0 with -gstabs+; there was no change with or without the patch.  The compiler wasn't setting the desc field in the SO stabs, of course, so I made a small C++ program
> 
> #include <iostream>
> 
> int foo (int a);
> int
> main()
> {
>    int a = 10;
>    std::cout << "hi there" << a << std::endl;
>    return foo (a);
> }
> 
> int foo (int a)
> {
>   return a + 5;
> }
> 
> 
> called "a.c", and modified the stabs by hand to
> 
>         .file   "a.c"
>         .stabs  "/tmp/",100,0,0,.Ltext0
>         .stabs  "a.c",100,0,4,.Ltext0
> 
> The value 4 is N_SO_CC.  Without this change, this is what gdb looks like:
> 
> (gdb) b foo
> Breakpoint 1 at 0x80488ed: file a.c, line 13.
> (gdb) r
> Starting program: /tmp/a.out
> hi there10
> 
> Breakpoint 1, _Z3fooi (a=10) at a.c:14
> 14        return a + 5;
> (gdb)
> 
> 
> With this change, we get
> 
> (gdb) b foo
> Breakpoint 1 at 0x80488ed: file a.c, line 14.
> (gdb) r
> Starting program: /tmp/a.out
> hi there10
> 
> Breakpoint 1, foo (a=10) at a.c:14
> 14        return a + 5;
> Current language:  auto; currently c++
> (gdb)
> 
> 
> Huzzah.
> 
> (obviously this is just an example of incorrect behavior -- when you're working with real C++ code the inability to detect the fact that it's a C++ program causes all sorts of problems.)
> 
> J