[swift-users] Serious Issue with Project Preprocessor Build Setting, Xcode 7.3 and Swift.

[Daniel Dunbar]

> On Mar 24, 2016, at 5:21 AM, James Campbell <james at supmenow.com> wrote:
> 
> This is the "GCC_PREPROCESSOR_DEFINITIONS" build setting. This previously imported into swift. But in Xcode 7.3 it no longer does this.

Ok, and exactly how are you trying to use them? Via an #if in C or via an #if in Swift?

 - Daniel

> 
> If I write the Macros in the bridging header they are imported but I would ideally like to keep them in a build setting.
> 
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> On Wed, Mar 23, 2016 at 11:23 PM, Daniel Dunbar <daniel_dunbar at apple.com <mailto:daniel_dunbar at apple.com>> wrote:
> To follow on to what Joe said, can you provide more info about the exact problem. Is this a C preprocessor definition that you expect to be available in code imported by the Clang importer (i.e., bridging header files, etc.), or is a a macro you are expecting to use within Swift itself? And please let us know exactly which build setting you are referring to.
> 
> Thanks,
>  - Daniel
> 
> > On Mar 23, 2016, at 3:59 PM, Joe Groff via swift-users <swift-users at swift.org <mailto:swift-users at swift.org>> wrote:
> >
> >
> >> On Mar 23, 2016, at 9:43 AM, James Campbell via swift-users <swift-users at swift.org <mailto:swift-users at swift.org>> wrote:
> >>
> >> We are experiencing an issue when compiling swift code under Xcode 7.3.
> >>
> >> Preprocessor macros specified in the Xcode Project aren't imported into swift. Ones manually declared in code are imported fine.
> >>
> >> Specifying Xcode 7.3 to use the Xcode 7.2 toolchain (Swift 2.1 etc) has no effect on this.
> >>
> >> This is preventing us from using Xcode 7.3 and being able to test for 9.3. Anybody else getting this issue?
> >
> > The Swift and C family build settings in Xcode are distinct. Are you sure you set the -D flags in "Other Swift Flags" and not in the C build settings? Swift doesn't have preprocessor macros.
> >
> > -Joe
> >
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