Bug#157416: _Pragma() from macros - bug

[Neil Booth <neil@daikokuya.co.uk>]

Zack Weinberg wrote:-

> This was reported to the Debian bug-tracking system:
> 
> $ cat foo.c
> _Pragma("foo"); int y;
> #define FOO _Pragma("foo"); int x;
> FOO
> aps100@cyclone:~$ cpp-3.2 foo.c
> # 1 "foo.c"
> # 1 "<built-in>"
> # 1 "<command line>"
> # 1 "foo.c"
> 
> # 1 "foo.c"
> #pragma foo 
> # 1 "foo.c"
>              ; int y;
> 
> 
> # 3 "foo.c"
> #pragma ; int x;foo 
> 
> > The first line is expanded correctly; the third is not (rendering
> > _Pragma almost completely useless).
> 
> Do you have time to look into this, Neil?

I'll try to have a look this weekend.

Neil.