Sage cannot find gcc on OS X

[Michael Frey]

I am running the Sage app on OS X.  My code makes a call to cython.  When I execute the code I get an error:

gcc -fno-strict-aliasing -I/Users/buildslave-sage/slave/binary_pkg/build/source/SageMath/jc4b6yulaujayb9sr94ia88eourzeqip0oidma/local/var/tmp/sage/build/python2-2.7.10.p3/include -DNDEBUG -g -fwrapv -O3 -Wall -Wno-unused -I/Applications/SageMath-7.4.app/Contents/Resources/sage/local/include -I/Applications/SageMath-7.4.app/Contents/Resources/sage/local/include/python2.7 -I/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python2.7/site-packages/numpy/core/include -I/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python2.7/site-packages -I/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python2.7/site-packages/sage/ext -I/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python2.7/site-packages/cysignals -I/Users/michael/.sage/temp/Michaels-MBP.freystuff.com/34036 -I/Applications/SageMath-7.4.app/Contents/Resources/sage/local/include/python2.7 -c _Users_michael__sage_temp_Michaels_MBP_freystuff_com_34036_tmp_81FKRa_spyx_0.c -o build/temp.macosx-10.9-x86_64-2.7/_Users_michael__sage_temp_Michaels_MBP_freystuff_com_34036_tmp_81FKRa_spyx_0.o -w -O2

In file included from /Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/gcc/x86_64-apple-darwin15.6.0/4.9.3/include-fixed/syslimits.h:7:0,
                 from /Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/gcc/x86_64-apple-darwin15.6.0/4.9.3/include-fixed/limits.h:34,
                 from /Applications/SageMath-7.4.app/Contents/Resources/sage/local/include/python2.7/Python.h:19,
                 from _Users_michael__sage_temp_Michaels_MBP_freystuff_com_34036_tmp_81FKRa_spyx_0.c:4:
/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/gcc/x86_64-apple-darwin15.6.0/4.9.3/include-fixed/limits.h:168:61: fatal error: limits.h: No such file or directory
 #include_next <limits.h>  /* recurse down to the real one */
                                                             ^
compilation terminated.
error: command 'gcc' failed with exit status 1

The limits.h file exists:

pwd

/Applications/SageMath-7.4.app

Michaels-MBP:SageMath-7.4.app michael$ find . -type f -iname 'limits.h' -ls

1373529        8 -rw-r--r--    1 michael          admin                1214 Oct 19 16:11 ./Contents/Resources/sage/local/include/c++/4.9.3/tr1/limits.h

1376268       16 -rw-r--r--    1 michael          admin                5382 Oct 19 16:07 ./Contents/Resources/sage/local/lib/gcc/x86_64-apple-darwin15.6.0/4.9.3/include-fixed/limits.h

1376277       16 -rw-r--r--    1 michael          admin                5382 Oct 19 16:11 ./Contents/Resources/sage/local/lib/gcc/x86_64-apple-darwin15.6.0/4.9.3/install-tools/include/limits.h

Hopefully there is an easy fix for this.

Mike

Code:

[Volker Braun]

You need xcode for various system headers.

[Michael Frey]

Thank you for the quick reply.

I have xCode installed.  gcc is located at /Applications/Xcode.app/Contents/Developer/usr/bin/.

There about 50 versions of limits.h.  Which one is sage looking for?

Mike

[Dima Pasechnik]

On Tuesday, January 10, 2017 at 11:54:16 AM UTC, Michael Frey wrote:

Thank you for the quick reply.

I have xCode installed.  gcc is located at /Applications/Xcode.app/Contents/Developer/usr/bin/.

this is not the gcc used to build Sage on OSX, as it is old and a bit broken. 

Sage builds its own gcc and uses it.

Have you built Sage from source? I guess not. Unfortunately binary builds of Sage are a bit flaky.

I'd suggest to build Sage from source and try your code then.

[Dima Pasechnik]

Regarding building from source, you'd rather build the develop branch of

https://github.com/sagemath/sage/

(which should be Sage 7.5.rc3), as 7.4 has known issues with latest OSX versions.

[Jeroen Demeyer]

On 2017-01-10 12:54, Michael Frey wrote:
> Which one is sage looking for?

The one in /usr/include