Michael Felt <aixto...@felt.demon.nl> added the comment:

There are, perhaps, other issues as well.

After a build of "master"

a) pip3 install pandas
 - failed to find/download and build numpy
 - after "manual" pip3 install numpy and got to " six, python-dateutil, pytz, 
pandas"

Then:
 Running setup.py install for pandas ... error
    Complete output from command /opt/bin/python3.8 -u -c "import setuptools, 
tokenize;__file__='/tmp/pip-install-f5rvzoc0/pandas/setup.py';f=getattr(tokenize,
 'open', open)(__file__);code=f.read().replace('\r\n', 
'\n');f.close();exec(compile(code, __file__, 'exec'))" install --record 
/tmp/pip-record-kmi2p9sd/install-record.txt --single-version-externally-managed 
--compile:
...
    UPDATING build/lib.aix-6.1-3.8-pydebug/pandas/_version.py
    set build/lib.aix-6.1-3.8-pydebug/pandas/_version.py to '0.23.4'
    running build_ext
    building 'pandas._libs.algos' extension
    creating build/temp.aix-6.1-3.8-pydebug
    creating build/temp.aix-6.1-3.8-pydebug/pandas
    creating build/temp.aix-6.1-3.8-pydebug/pandas/_libs
    xlc_r -O -I/opt/include -O2 -qmaxmem=-1 -qarch=pwr5 -I/opt/include -O2 
-qmaxmem=-1 -qarch=pwr5 -Ipandas/_libs/src/klib -Ipandas/_libs/src 
-I/opt/lib/python3.8/site-packages/numpy/core/include 
-I/opt/include/python3.8dm -c pandas/_libs/algos.c -o 
build/temp.aix-6.1-3.8-pydebug/pandas/_libs/algos.o -Wno-unused-function
    xlc_r: 1501-210 (S) command option Wno-unused-function contains an 
incorrect subargument
    error: command 'xlc_r' failed with exit status 40

    ----------------------------------------
Command "/opt/bin/python3.8 -u -c "import setuptools, 
tokenize;__file__='/tmp/pip-install-f5rvzoc0/pandas/setup.py';f=getattr(tokenize,
 'open', open)(__file__);code=f.read().replace('\r\n', 
'\n');f.close();exec(compile(code, __file__, 'exec'))" install --record 
/tmp/pip-record-kmi2p9sd/install-record.txt --single-version-externally-managed 
--compile" failed with error code 1 in /tmp/pip-install-f5rvzoc0/pandas/

So, it looks like, using xlc - I may not have even gotten as far window.gcc due 
to issues in pandas (the incorrect flag -Wno-used-function - have to find where 
that came from!)

----------
Added file: https://bugs.python.org/file47919/pip3_build_pandas_0001.text

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<https://bugs.python.org/issue35198>
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