BUG: pandas does not build on AIX - when using xlc/xlC as compiler

[aixtools]

• [x ] I have checked that this issue has not already been reported.

• [ x] I have confirmed this bug exists on the latest version of pandas.

• (optional) I have confirmed this bug exists on the master branch of pandas.

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Panda build stops with:

"pandas/_libs/window/aggregations.cpp", line 5436.23: 1540-0063 (S) The text "(" is unexpected.
"pandas/_libs/window/aggregations.cpp", line 5523.23: 1540-0063 (S) The text "(" is unexpected.
"pandas/_libs/window/aggregations.cpp", line 6759.21: 1540-0063 (S) The text "(" is unexpected.
"pandas/_libs/window/aggregations.cpp", line 20023.21: 1540-0063 (S) The text "(" is unexpected.

On examining this I see that there are special statements - perhaps unsupported by xlc/xlC (v11).

 +5436      __pyx_t_1 = (std::signbit(__pyx_v_val) != 0);

 +5523      __pyx_t_1 = (std::signbit(__pyx_v_val) != 0);

 +6759    __pyx_t_1 = (std::isnan(__pyx_v_val) != 0);

+20023    __pyx_t_1 = (std::isnan(__pyx_v_val) != 0);

There is a good chance this is an issue caused by cython. but I thought I would post/mention it here as well.

[jreback]

we have no support on AIX - but would accept patches

[aixtools]

Would love to help - but will need help creating a patch. Cython says - not our problem: cython/cython#3723

The pandas reference they include goes well beyond my understanding of compilers.

Maybe it is fixed in v16 of the IBM compiler (I have v11 licensed), maybe it will be fixed in the next release (based on LLVM iirc) - but that does not help me now. And switching to gcc is not a supportable option for me. For AIX, using gcc means you must develop and maintain a complete GNU-GCC RTE. Do not have the resources for that.

[aixtools]

For a starting point - currently testing the tagged

• versions 0.23,4, 0.24.2 and
• version 0.25.3 - stopped with similar issue:

xlc_r -DNDEBUG -O -I/opt/include -O2 -qmaxmem=-1 -qarch=pwr5 -I/opt/include -O2 -qmaxmem=-1 -qarch=pwr5 -DNPY_NO_DEPRECATED_API=0 -Ipandas/_libs -I./pandas/_libs -Ipandas/_libs/src/klib -Ipandas/_libs/src -I/opt/python/py37/lib/python3.7/site-packages/numpy/core/include -I/opt/python/py37/include -I/opt/include/python3.7m -c pandas/_libs/window.cpp -o build/temp.aix-6106-1043-32-3.7/pandas/_libs/window.o
"pandas/_libs/window.cpp", line 10039.23: 1540-0063 (S) The text "(" is unexpected.
"pandas/_libs/window.cpp", line 10126.23: 1540-0063 (S) The text "(" is unexpected.
"pandas/_libs/window.cpp", line 11258.21: 1540-0063 (S) The text "(" is unexpected.

FYI: checked my archives - last version I had built successfully was 0.19.0 (in Oct 2106)

[WillAyd]

I think @da-woods summed it up well on the Cython issue; seems like more of a compiler C++11 support issue than anything else

If you can find a way to define compatible functions without C++11 support feel free to push a PR

[WillAyd]

At this point in time pandas requires C++11 and that is explicitly enforced by the build system, so I don't think there is much to do here