[Bug preprocessor/50387] New: Doesn't process "_Pragma" when expanding a token sequence for #include

[Bug preprocessor/50387] New: Doesn't process "_Pragma" when expanding a token sequence for #include

[schaub.johannes at googlemail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50387

             Bug #: 50387
           Summary: Doesn't process "_Pragma" when expanding a token
                    sequence for #include
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: preprocessor
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: schaub.johannes@googlemail.com


The following code works fine with Clang and as far as I can see, C++11
requires this to work (modulo the pragma's content interpretation):

   #define GET(H) _Pragma("diagnostic push") <H>
   #include GET(stdio.h)

The code I'm working on uses this feature to implement something and it would
be nice if GCC would support this too.

[Bug preprocessor/50387] Doesn't process "_Pragma" when expanding a token sequence for #include

[naesten at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50387

Samuel Bronson <naesten at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |naesten at gmail dot com

--- Comment #1 from Samuel Bronson <naesten at gmail dot com> 2012-07-10 18:18:20 UTC ---
I think you forgot the "GCC " at the beginning of the pragma text?

Also, you forgot to show what happens when you attempt to do this, preferably
using a test header constructed for the purpose (to keep the testcase small and
self-contained).  But perhaps adding "GCC " is all you need?

[Bug preprocessor/50387] Doesn't process "_Pragma" when expanding a token sequence for #include

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50387

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Simplified testcase:
```
#define GET(H) _Pragma("") <H>
#include GET(stdio.h)
```

Both MSVC and clang are able to handle this.

ICC rejects it for the same reason as GCC.