port select python and config error

[Mark Brethen]

brethen-air:~ marbre$ port select --summary
Warning: port definitions are more than two weeks old, consider updating them by running 'port selfupdate'.
Name       Selected      Options
====       ========      =======
clang      none          mp-clang-6.0 none
cython     none          cython36 none
gcc        none          mp-gcc7 none
ipython    py34-ipython  none
llvm       none          mp-llvm-3.4 mp-llvm-6.0 none
mpi        none          mpich-mp-fortran none
nosetests  none          nosetests36 none
pip        pip34         none
py-sympy   py36-sympy    py36-sympy none
python     python27      python26-apple python27 python27-apple python36 none
python2    python27      python26-apple python27 python27-apple none
python3    python36      python36 none
wxWidgets  none          wxWidgets-3.0 none

With macports python 2.7 it’s a different error:

:info:build /opt/local/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python: can't open file 'setup.py': [Errno 2] No such file or directory
:info:build Command failed:  cd "/opt/local/var/macports/build/_Users_marbre_ports_math_reduce/libreduce/work/Reduce-svn4765-src/generic/libreduce/x86_64-mac_10.12_sierra-darwin16.7.0" && /opt/local/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7 setup.py --no-user-cfg build 
:info:build Exit code: 2
:error:build Failed to build libreduce: command execution failed
:debug:build Error code: CHILDSTATUS 96796 2
:debug:build Backtrace: command execution failed
:debug:build     while executing
:debug:build "system {*}$notty {*}$nice $fullcmdstring"
:debug:build     invoked from within
:debug:build "command_exec build"
:debug:build     (procedure "portbuild::build_main" line 8)
:debug:build     invoked from within
:debug:build "$procedure $targetname"
:error:build See /opt/local/var/macports/logs/_Users_marbre_ports_math_reduce/libreduce/main.log for details.

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Mark Brethen
mark.brethen at gmail.com



> On Oct 28, 2018, at 4:25 PM, Ryan Schmidt <ryandesign at macports.org> wrote:
> 
> 
> 
> On Oct 28, 2018, at 16:08, Mark Brethen wrote:
> 
>> Quite by accident I have discovered a flaw with my libreduce port as regards to "port select —set python". I had not set a default python version before I built the reduce libraries, unaware it was using apple's system python 2.7 to build. However, when I set a python version using port select —set python and add the python group, libreduce fails at configure. There is a file ‘ac_python_devel.m4’ in the source directory that is throwing the error (see attached). I’m not sure why builds with apple’s python and not macports.
>> 
>> <main.log><ac_python_devel.m4>
> 
> Which version of python did you select?
> 
> The error shown in your log is:
> 
> :info:configure checking for python... /opt/local/bin/python
> :info:configure checking for a version of Python >= '2.1.0'...   File "<string>", line 1
> :info:configure     import sys, string; 		ver = string.split(sys.version)[0]; 		print ver >= '2.1.0'
> :info:configure                                                                         ^
> :info:configure SyntaxError: invalid syntax
> :info:configure no
> 
> If I pass that code to MacPorts python2.7 it works fine. If I pass it to MacPorts python3.5 it shows an invalid syntax error, because it is: python3 changed the syntax of the print command. It's now a function, not a language construct, so parentheses need to be used.
> 
> In addition, string.split is gone in python3.
> 
> Code that works with both python2 and python3 is:
> 
> import sys, string; ver = sys.version.split()[0]; print(ver >= '2.1.0')
> 
> You might suggest that to the developers of this software.
> 
> Using a string comparison operator on version numbers is probably wrong too.
> 
> If the configure script's code wasn't compatible with python3, who knows if the rest of the project's python code is. If it's not, easiest to just force the port to use /usr/bin/python. Setting "configure.python /usr/bin/python" might do that.
>