[swift-dev] [swift-corelibs-dev] Defining _GNU_SOURCE for module-map-included headers

[Pierre Habouzit]

> On Dec 21, 2015, at 9:34 AM, Jordan Rose via swift-corelibs-dev <swift-corelibs-dev at swift.org> wrote:
> 
> Hm. If this is the right setting to set on everybody's system, we could add it as part of Clang initialization (for the Clang inside Swift). Otherwise, you can use "-Xcc" to pass extra flags to Clang, in this case "-Xcc -D_GNU_SOURCE=1”.

You definitely want -D_GNU_SOURCE=1 on linux systems, as all the non portable calls (that also are the interesting ones) will be hidden behind this.

> 
> Hope that helps,
> Jordan
> 
>> On Dec 20, 2015, at 2:29 , Dmitri Gribenko <gribozavr at gmail.com> wrote:
>> 
>> + swift-dev, Jordan
>> 
>> On Sun, Dec 20, 2015 at 2:21 AM, Dan Stenmark via swift-corelibs-dev
>> <swift-corelibs-dev at swift.org> wrote:
>>> I'm trying to invoke Linux's unshare() system call from Swift, but without much success.  From C, it requires _GNU_SOURCE to be #define'd before the #include <sched.h>.  The Glibc module map does indeed include sched.h, so the lack of _GNU_SOURCE appears to be the likely culprit.  What's the appropriate action to take here?
>>> 
>>> Dan
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>> 
>> 
>> 
>> -- 
>> main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
>> (j){printf("%d\n",i);}}} /*Dmitri Gribenko <gribozavr at gmail.com>*/
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