[Bug c/52946] New: Unable to define a Block variable

[Bug c/52946] New: Unable to define a Block variable

[lunfis at gmx dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52946

             Bug #: 52946
           Summary: Unable to define a Block variable
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: lunfis@gmx.de


when defining a 'block' variable using valid syntax (test.c):

#include <stdio.h>

int main (int argc, const char * argv[]) {  

  int (^myBlock)(int) = ^(int num) {
      return num;
      };

  printf("Result is %d\n", myBlock(3));

  return 0;  
}  

"gcc test.c" gives error message: "test.c:5:8: error: expected identifier or
‘(’ before ‘^’ token"

This compiles and executes correctly with gcc 4.2.

[Bug c/52946] Unable to define a Block variable

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52946

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|major                       |enhancement

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-04-12 16:19:35 UTC ---
Blocks are not part of GNU GCC at all.
The support for them was not submitted upstream by Apple or reimplemented by
anyone else.

[Bug c/52946] Unable to define a Block variable

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52946

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |manu at gcc dot gnu.org
         Resolution|                            |INVALID

--- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2012-04-12 18:39:56 UTC ---
Which means that this is a proprietary non-portable extension by Apple. It
doesn't work with other compilers except Apple's. You should really not use it.

[Bug c/52946] Unable to define a Block variable

[lunfis at gmx dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52946

--- Comment #3 from Lund <lunfis at gmx dot de> 2012-04-13 01:08:12 UTC ---
OK, my mistake. I did not realize Apple's gcc was that different.

In case, anyone else comes across this issue, I was able to work around it by
installing clang/LLVM and get the 'blocks' library from here:
https://github.com/mackyle/blocksruntime.