[MacPorts] #51713: devel/ninja update and build fix

[MacPorts]

#51713: devel/ninja update and build fix
-----------------------+--------------------------------
 Reporter:  slewsys@…  |      Owner:  macports-tickets@…
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.3.4
 Keywords:             |       Port:
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 '''devel/ninja''' fails to build under ''OS X 10.11.5/Xcode 7.3.1''.
 At some point during bootstrap, the file {{{build.ninja}}} is be appended
 to itself.  Although bootstrap succeeds, subsequent rebuild with
 {{{./ninja}}} fails since {{{rule cxx}}}, et al. occur twice.

 Manually invoking {{{python configure.py --bootstrap}}} completes without
 errors, so it appears to be an interaction between
 {{{port}}} and {{{python}}} (either {{{/usr/bin/python}}} or MacPorts
 {{{python2.7}}}).

 Unable to replicate issue under ''OS X 10.9.5/Xcode 6.2''.

 Attached is a workaround (works on both systems) and update to ninja
 1.7.1.  {{{configure.py}}} is patched to run bootstrap only. It's invoked
 at the configure stage.  After bootstrap, the script {{{configure}}} then
 edits {{{build.ninja}}} to remove any redundancy.

 Ninja does not appear to have an active maintainer.

-- 
Ticket URL: <https://trac.macports.org/ticket/51713>
MacPorts <https://www.macports.org/>
Ports system for OS X