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

[Jordan Rose]

Ahh. Yes, we were. We would define the macro in Clang, then when we do a lookup we'd get it back out in Swift. I, um, wouldn't have considered that intentional, but clearly people are depending on it. Sorry, James!

Doug, we saw a similar issue with macros in bridging headers, right? Do you remember which that was? Do you have an opinion here?

Jordan


> On Mar 24, 2016, at 9:06 , Daniel Dunbar <daniel_dunbar at apple.com> wrote:
> 
> (+Jordan)
> 
> Jordan, did something change here? Were we previously getting these via the Clang importer in a way we aren't anymore?
> 
>  - Daniel
> 
>> On Mar 24, 2016, at 9:02 AM, James Campbell <james at supmenow.com <mailto:james at supmenow.com>> wrote:
>> 
>> I've just attached one now. The preprocessor macro is specified in the build settings.
>> 
>> In Xcode 7.2 these were imported and worked like they did in C i.e API_VERSION=2 would be imported as a constant named API_VERSION and would be a 2
>> 
>> In Xcode 7.3 it broke.
>> 
>> ___________________________________
>> 
>> James⎥Head Of CEO
>> 
>> james at supmenow.com <mailto:james at supmenow.com>⎥supmenow.com <http://supmenow.com/>
>> Sup
>> 
>> Runway East
>> 
>> 
>> 10 Finsbury Square
>> 
>> London
>> 
>> 
>> EC2A 1AF 
>> 
>> 
>> On Thu, Mar 24, 2016 at 3:54 PM, Daniel Dunbar <daniel_dunbar at apple.com <mailto:daniel_dunbar at apple.com>> wrote:
>> Swift has never supported referring directly to macros, it only supports "build configurations". I'm still not sure exactly what you have that could have worked previously.
>> 
>> Can you please attach a complete project showing something which worked in 7.2 and does not work now to the bug you filed?
>> 
>>  - Daniel
>> 
>>> On Mar 24, 2016, at 8:50 AM, James Campbell <james at supmenow.com <mailto:james at supmenow.com>> wrote:
>>> 
>>> To hold keys and api endpoints.
>>> 
>>> In the past for Objective-C I would have used it like this:
>>> 
>>> request.api_endpoint = MY_MACRO_ENDPOINT
>>> 
>>> And then when Swift was released I was able to do it in Xcode 7.2:
>>> 
>>> request.api_endpoint = MY_MACRO_ENDPOINT
>>> 
>>> But when using Xocde 7.3 I get this:
>>> 
>>> request.api_endpoint = MY_MACRO_ENDPOINT //MY_MACRO_ENDPOINT not defined.
>>> 
>>> 
>>> ___________________________________
>>> 
>>> James⎥Head Of CEO
>>> 
>>> james at supmenow.com <mailto:james at supmenow.com>⎥supmenow.com <http://supmenow.com/>
>>> Sup
>>> 
>>> Runway East
>>> 
>>> 
>>> 10 Finsbury Square
>>> 
>>> London
>>> 
>>> 
>>> EC2A 1AF 
>>> 
>>> 
>>> On Thu, Mar 24, 2016 at 3:40 PM, Daniel Dunbar <daniel_dunbar at apple.com <mailto:daniel_dunbar at apple.com>> wrote:
>>> 
>>>> On Mar 24, 2016, at 5:21 AM, James Campbell <james at supmenow.com <mailto: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.
>>>> 
>>>> ___________________________________
>>>> 
>>>> James⎥Head Of CEO
>>>> 
>>>> james at supmenow.com <mailto:james at supmenow.com>⎥supmenow.com <http://supmenow.com/>
>>>> Sup
>>>> 
>>>> Runway East
>>>> 
>>>> 
>>>> 10 Finsbury Square
>>>> 
>>>> London
>>>> 
>>>> 
>>>> EC2A 1AF 
>>>> 
>>>> 
>>>> 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
>>>> >
>>>> > _______________________________________________
>>>> > swift-users mailing list
>>>> > swift-users at swift.org <mailto:swift-users at swift.org>
>>>> > https://lists.swift.org/mailman/listinfo/swift-users <https://lists.swift.org/mailman/listinfo/swift-users>
>>>> 
>>>> 
>>> 
>>> 
>> 
>> 
> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.swift.org/pipermail/swift-users/attachments/20160324/70863cca/attachment.html>