[gdal-dev] Help request to make Python bindings to build again with MacOS X 10.9

[William Kyngesburye]

It looks like a bit of a coordination and packaging snafu with Apple.  Apple builds Python with some old flags that clang doesn't support, but clang defaulted to NOT reporting the unknown flag as error.  The recent clang 5.1 changed this default to error.

I found a discussion about it on stackoverflow:

http://stackoverflow.com/questions/22313407/clang-error-unknown-argument-mno-fused-madd-python-package-installation-fa

The -Qunused-arguments trick seems to work for some and not others.  There is another method to try (the error actually mentions it): add this to ARCHFLAGS:

-Wno-error=unused-command-line-argument-hard-error-in-future

On Apr 19, 2014, at 11:22 AM, Even Rouault <even.rouault at mines-paris.org> wrote:

> Hi,
> 
> I've noticed that since a few days our Travis-CI MacOS X job has started to fail building the Python bindings.
> 
> The last successfull build was https://travis-ci.org/rouault/gdal_coverage/builds/22998284 with
> i386-apple-darwin12.5.0 (MacOSX 10.8)
> 
> The current build ( https://travis-ci.org/rouault/gdal_coverage/builds/23333274 ) fails with i386-apple-darwin13.1.0 (MacOSX 10.9)
> 
> The error is https://travis-ci.org/rouault/gdal_coverage/builds/23333274#L5311 :
> 
> creating build/temp.macosx-10.9-intel-2.7
> creating build/temp.macosx-10.9-intel-2.7/extensions
> cc -fno-strict-aliasing -fno-common -dynamic -arch x86_64 -arch i386 -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -
> Wstrict-prototypes -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -arch i386 -pipe -I../../port -I../../gcore -I../../alg -I../../ogr/ -
> I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -I/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy/core/include -
> I/Users/travis/build/rouault/gdal_coverage/gdal/include -c extensions/gdal_wrap.cpp -o build/temp.macosx-10.9-intel-2.7/extensions/gdal_wrap.o
> clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
> clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
> error: command 'cc' failed with exit status 1
> 
> The last successfull build had this trace :
> 
> creating build/temp.macosx-10.8-intel-2.7
> creating build/temp.macosx-10.8-intel-2.7/extensions
> clang -fno-strict-aliasing -fno-common -dynamic -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -
> Wshorten-64-to-32 -DNDEBUG -g -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch i386 -arch x86_64 -pipe -I../../port -I../../gcore -I../../alg -I../../ogr/ -
> I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -I/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy/core/include -
> I/Users/travis/build/rouault/gdal_coverage/gdal/include -c extensions/gdal_wrap.cpp -o build/temp.macosx-10.8-intel-2.7/extensions/gdal_wrap.o
> clang: warning: argument unused during compilation: '-mno-fused-madd'
> 
> So it seems that distutils add this -mno-fused-madd option that makes newer version of clang to fail.
> 
> I've found a potential fix in https://bitbucket.org/cffi/cffi/commits/a88e541 that suggest
> adding "-Qunused-arguments" and tested it with http://trac.osgeo.org/gdal/changeset/27220, but it still fails ( https://travis-ci.org/rouault/gdal_coverage/builds/23341848 )
> 
> cc -fno-strict-aliasing -fno-common -dynamic -arch x86_64 -arch i386 -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -
> Wstrict-prototypes -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -arch i386 -pipe -I../../port -I../../gcore -I../../alg -I../../ogr/ -
> I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -I/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy/core/include -
> I/Users/travis/build/rouault/gdal_coverage/gdal/include -c extensions/gdal_wrap.cpp -o build/temp.macosx-10.9-intel-2.7/extensions/gdal_wrap.o -Qunused-arguments
> clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
> clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
> error: command 'cc' failed with exit status 1
> 
> Any Pythonist with a Mac that might help with that ? The file to hack into is swig/python/setup.py
> 
> 
> Even
> 
> -- 
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-----
William Kyngesburye <kyngchaos*at*kyngchaos*dot*com>
http://www.kyngchaos.com/

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