[cfe-dev] "Blocks" runtime

Bill Bumgarner bbum at apple.com
Thu Jun 11 16:21:53 PDT 2009

On Jun 10, 2009, at 6:02 PM, Chris Lattner wrote:
> Hi all,
> In case you didn't notice, we committed the source for the Apple
> "blocks" runtime here:
> http://llvm.org/svn/llvm-project/compiler-rt/
> We haven't had a chance to properly integrate it into a build system,
> the ultimate goal is to combine it with "compiler-rt" which is the
> clang "libgcc" replacement (which should also be coming at some point
> soon).

I threw together a Makefile and compiled/ran a simple "hello world"  
block object on Linux.   This is likely completely wrong on the  
integration front, but it does work.

- check out compiler-rt into llvm/lib

- drop the attached Makefile into compiler-rt

- make

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I tested it with the following simple example (re-typed because my  
stupid VirtualBox based VM doesn't do networking with the host. Sigh):

#include <stdio.h>
int main(int argc, char **argv) {
   void (^helloBlock)(void) = ^{
     fprintf(stdout, "Hello World!\n");


   return 0;

Compile it with (from the llvm dir):

./Debug/bin/clang -fblocks hello.c -LDebug/lib -lBlocks


% ./a.out
Hello World!


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