Clang's C Blocks on Linux

[Kai Baker]

clang added something called blocks to C. It is very intriguing but I don't have an Apple computer. I know there's a package for clang blocks on Ubuntu. Is there a package for other distributions? Perhaps something from source I can compile?

kai

[Paul Eberhart]

Oh neat, closures for C, I've seen people hack them various ways but didn't know there were any widely-supported compiler extensions.  

The 30-second test makes me think almost all modern clang builds support it, but don't have it in the default flags so you have to give it -fblocks to enable (Example from the machine I'm on, tested via dumb c preprocessor trick): 

[pappp@Talaiot ~ $]cat testblocks.c 

#if __has_extension(blocks)

#pragma message "Clang built with blocks extension"

#else

#pragma message "Clang NOT built with blocks extension"

#endif

int main()

{

return 0;

}

[pappp@Talaiot ~ $]clang testblocks.c 

testblocks.c:4:11: warning: Clang NOT built with blocks extension

      [-W#pragma-messages]

         #pragma message "Clang NOT built with blocks extension"

                 ^

1 warning generated.

[pappp@Talaiot ~ $]clang -fblocks testblocks.c 

testblocks.c:2:10: warning: Clang built with blocks extension

      [-W#pragma-messages]

        #pragma message "Clang built with blocks extension"

                ^

1 warning generated.

[pappp@Talaiot ~ $]clang -v

clang version 3.9.1 (tags/RELEASE_391/final)

Target: x86_64-unknown-linux-gnu

Thread model: posix

InstalledDir: /usr/bin

Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-pc-linux-gnu/6.3.1

Found candidate GCC installation: /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/6.3.1

Found candidate GCC installation: /usr/lib/gcc/x86_64-pc-linux-gnu/6.3.1

Found candidate GCC installation: /usr/lib64/gcc/x86_64-pc-linux-gnu/6.3.1

Selected GCC installation: /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/6.3.1

Candidate multilib: .;@m64

Candidate multilib: 32;@m32

Selected multilib: .;@m64

On Fri, Apr 7, 2017 at 1:31 PM, Kai Baker <eigen...@gmail.com> wrote:

clang added something called blocks to C. It is very intriguing but I don't have an Apple computer. I know there's a package for clang blocks on Ubuntu. Is there a package for other distributions? Perhaps something from source I can compile?

kai

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Paul Selegue Eberhart (PAPPP) - http://www.pappp.net/
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