Originally posted by: Teej42

This is weird.  Matplotlib is a C++ program that is used by Python to plot a graph based on a set of data, very common tool and highly useful.  However, it is exposing errors within the library header files.  I am using GCC from this site (for AIX 7.1 - GCC 6.3.0):

The first error is:  

  /usr/bin/gcc -maix32 -D_LARGE_FILES -pthread -fno-strict-aliasing -D_GNU_SOURCE -fPIC -fno-strict-aliasing -fwrapv -D_LINUX_SOURCE_COMPAT -I/usr/include -I/opt/freeware/include -I/opt/freeware/include/ncurses -DNDEBUG -D_GNU_SOURCE -fPIC -fno-strict-aliasing -fwrapv -DFREETYPE_BUILD_TYPE=system -DPY_ARRAY_UNIQUE_SYMBOL=MPL_matplotlib_ft2font_ARRAY_API -DNPY_NO_DEPRECATED_API=NPY_1_7_API_VERSION -D__STDC_FORMAT_MACROS=1 -I/opt/freeware/lib/python2.7/site-packages/numpy/core/include -I/opt/freeware/lib/python2.7/site-packages/numpy/core/include -I/opt/freeware/include -I/opt/freeware/include/freetype2 -I/usr/local/include -I/usr/include -I. -I/opt/freeware/include/python2.7 -c src/ft2font.cpp -o build/temp.aix-7.1-2.7/src/ft2font.o

  In file included from /opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/6.3.0/include/c++/math.h:36:0,
                   from /opt/freeware/include/python2.7/pyport.h:325,
                   from /opt/freeware/include/python2.7/Python.h:61,
                   from src/mplutils.h:31,
                   from src/ft2font.cpp:10:
  /opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/6.3.0/include/c++/cmath:646:11: error: '::isnan' has not been declared
     using ::isnan;
             ^~~~~
  error: command '/usr/bin/gcc' failed with exit status 1

This was an easy fix, adding std before ::isnan; resolved this issue, although std is defined earlier in this code.  However, once I recompiled, this one stumped me:

  /usr/bin/gcc -maix32 -D_LARGE_FILES -pthread -fno-strict-aliasing -D_GNU_SOURCE -fPIC -fno-strict-aliasing -fwrapv -D_LINUX_SOURCE_COMPAT -I/usr/include -I/opt/freeware/include -I/opt/freeware/include/ncurses -DNDEBUG -D_GNU_SOURCE -fPIC -fno-strict-aliasing -fwrapv -DFREETYPE_BUILD_TYPE=system -DPY_ARRAY_UNIQUE_SYMBOL=MPL_matplotlib_ft2font_ARRAY_API -DNPY_NO_DEPRECATED_API=NPY_1_7_API_VERSION -D__STDC_FORMAT_MACROS=1 -I/opt/freeware/lib/python2.7/site-packages/numpy/core/include -I/opt/freeware/lib/python2.7/site-packages/numpy/core/include -I/opt/freeware/include -I/opt/freeware/include/freetype2 -I/usr/local/include -I/usr/include -I. -I/opt/freeware/include/python2.7 -c src/ft2font_wrapper.cpp -o build/temp.aix-7.1-2.7/src/ft2font_wrapper.o
  In file included from /opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/6.3.0/include/c++/powerpc-ibm-aix7.1.0.0/pthread/bits/gthr-default.h:30:0,
                   from /opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/6.3.0/include/c++/powerpc-ibm-aix7.1.0.0/pthread/bits/gthr.h:148,
                   from /opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/6.3.0/include/c++/ext/atomicity.h:35,
                   from /opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/6.3.0/include/c++/bits/basic_string.h:39,
                   from /opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/6.3.0/include/c++/string:52,
                   from /opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/6.3.0/include/c++/stdexcept:39,
                   from src/py_exceptions.h:7,
                   from src/ft2font_wrapper.cpp:4:
  /opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/6.3.0/include/c++/powerpc-ibm-aix7.1.0.0/pthread/bits/gthr-posix.h:118:1: error: 'pthread_mutex_timedlock' was not declared in this scope
   __gthrw(pthread_mutex_timedlock)
   ^
  /opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/6.3.0/include/c++/powerpc-ibm-aix7.1.0.0/pthread/bits/gthr-posix.h: In function 'int __gthread_mutex_timedlock(__gthread_mutex_t*, const __gthread_time_t*)':
  /opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/6.3.0/include/c++/powerpc-ibm-aix7.1.0.0/pthread/bits/gthr-posix.h:768:69: error: '__gthrw_pthread_mutex_timedlock' cannot be used as a function
       return __gthrw_(pthread_mutex_timedlock) (__mutex, __abs_timeout);
                                                                       ^
  error: command '/usr/bin/gcc' failed with exit status 1

I have no idea how to resolve this one.

Is there a known issue with both of those header files?  Why?

To reproduce, get all dependencies set up:

GCC/G++
Python 2.7
All dependencies detailed here:  https://matplotlib.org/users/installing.html#dependencies
Include /opt/freeware/bin in your PATH

Then run:  pip install matplotlib==2.2.3

Other option is to download the source from here (https://github.com/matplotlib/matplotlib) and try to compile ft2font.cpp and ft2font_wrapper.cpp using the above options.

Please advise on what I may be missing, or whether this whole problems are caused by a bug somewhere else (bad/old GCC header files?)

Originally posted by: Teej42

Note, I discovered that there was a new version of GCC RPMs and I installed those, only to see the same issues.

$ ls -1 done |grep 6.3.0-2                                                                                       
gcc-6.3.0-2.aix7.1.ppc.rpm
gcc-cplusplus-6.3.0-2.aix7.1.ppc.rpm
gcc-cpp-6.3.0-2.aix7.1.ppc.rpm
gcc-gfortran-6.3.0-2.aix7.1.ppc.rpm
libgcc-6.3.0-2.aix7.1.ppc.rpm
libstdcplusplus-6.3.0-2.aix7.1.ppc.rpm
libstdcplusplus-devel-6.3.0-2.aix7.1.ppc.rpm

Originally posted by: AyappanP

Just checked /usr/include/pthread.h. pthread_mutex_timedlock is guarded by _XOPEN_SOURCE >=600. 

#if (_XOPEN_SOURCE >= 600)

extern int
pthread_mutex_timedlock __((pthread_mutex_t *__restrict__,
                             const struct timespec *__restrict__));
#endif

Tried setting it via python _sysconfigdata.py doesn't seems to be working. Need to look deeper into this.

Removing this check from the header file makes the installation successful.

Originally posted by: Teej42

I can confirm this address the original issue, but the two modifications are of concern.  

1.  Why std::isnan; and not ::isnan;?  Is this a bug in GCC's header file?

2.  Can we have a better solution than modifying the AIX's pthread.h file?

Please let us know.  Thanks!

Originally posted by: AyappanP

Both issues seems to be coming because of these conditions in matplotlib source code.

# grep -r "XOPEN_SOURCE" *
extern/ttconv/pprdrv_tt.cpp:#ifdef _XOPEN_SOURCE
extern/ttconv/pprdrv_tt.cpp:#    undef _XOPEN_SOURCE
src/_png.cpp:   Undefining _POSIX_C_SOURCE and _XOPEN_SOURCE stops a couple
src/_png.cpp:#   ifdef _XOPEN_SOURCE
src/_png.cpp:#       undef _XOPEN_SOURCE
src/mplutils.h:#ifdef _XOPEN_SOURCE
src/mplutils.h:#    undef _XOPEN_SOURCE
src/numpy_cpp.h:#ifdef _XOPEN_SOURCE
src/numpy_cpp.h:#    undef _XOPEN_SOURCE

There are undefining _XOPEN_SOURCE . Because of which the "isnan" from math.h and "pthread_mutex_timedlock" from pthread.h are missing out. 

If you remove these conditions or put "#ifndef _AIX" around these , then things seems to be working. 

Originally posted by: Teej42

I will ping the matplotlib team on this resolution.  Any details on the GCC issue?

Thanks!

-T.J.

Originally posted by: AyappanP

As i mentioned in the earlier thread, both has same root cause.

Undefining _XOPEN_SOURCE takes out isnan from math.h

#if (_XOPEN_SOURCE<600) || defined(_ALL_SOURCE)
extern     int      isnan();
 

So the global declaration is gone and "using ::isnan" will not work. 

Originally posted by: Teej42

Ticket opened with Matplotlib team - https://github.com/matplotlib/matplotlib/issues/12535

Originally posted by: sanket

Here is the tutorial how to install ML tools (NumPy, SciPy, Matplotlib, Pandas, scikit-learn and other on AIX)

https://developer.ibm.com/tutorials/machine-learning-with-python-on-aix/

I hope this will be helpful.