Re: [SOLVED] Re: Further problems trying to build GNUstep with blocks/properties support

[Thomas Davie]

On 22 Jun 2010, at 10:56, David Chisnall wrote:

> On 22 Jun 2010, at 10:51, Thomas Davie wrote:
> 
>> The only problem I have remaining is that it appears that nowhere in 
>> Foundation.h is blocks_runtime.h ever imported.  The result is that in my 
>> code, Block_copy and friends are inaccessible.  I don't know where the 
>> appropriate place to include this is, could you add it in the right place 
>> and commit again?
> 
> Richard, I think this one's for you...
> 
> We only need to bother including blocks_runtime.h when using clang, since GCC 
> doesn't support blocks, so we can wrap it in a __has_include() test, but we 
> should probably also wrap it in a __has_feature() test to make sure we are 
> compiling with -fblocks (I'm not sure what happens if you include that header 
> without blocks support).
> 
> How are we currently deciding whether to import the libobjc2 or ObjectiveC2 
> headers in Foundation?  I've not really checked, but we should be doing this 
> the same way...

Hi David,

Some further testing (manually including blocks_runtime.h) reveals that there's 
still some problems, inserting a block into a collection appears to cause a 
segfault:

#include "blocks_runtime.h"
#include <Foundation/Foundation.h>

int main (int argc, char ** argv)
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    NSLog(@"a");
    NSMutableArray *blockArray = [NSMutableArray array];
    NSLog(@"b");
    NSString *(^block)(int x) = ^(int x) { return [NSString 
stringWithFormat:@"Test %d", x]; };
    NSLog(@"c");
    NSString *(^block1)(int x) = Block_copy(block);
    NSLog(@"d");
    [blockArray addObject:block1];
    NSLog(@"e");
    NSString *(^block2)(int arg) = [blockArray objectAtIndex:0];
    NSLog(@"f");
    NSLog(@"%@", block(4));
    NSLog(@"%@", block2(5));

    [pool release];

    return 1;
}

This logs a,b,c,d, and then Seg Faults.

Tom Davie