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build: use bin path override if no python is found in PATH

Rodrigo Muino Tomonari requested to merge github/fork/bradleythughes/build-use-bin-override-if-no-python into master

On systems with no "python" in the PATH, e.g. when building with poudriere on FreeBSD, we should always create a python symlink in get_bin_override(). Otherwise, configure fails with the following error:

Traceback (most recent call last):
  File "./configure", line 1461, in <module>
    bin_override = get_bin_override()
  File "./configure", line 1360, in get_bin_override
    if os.path.realpath(which('python')) == os.path.realpath(sys.executable):
  File "/usr/local/lib/python2.7/posixpath.py", line 375, in realpath
    path, ok = _joinrealpath('', filename, {})
  File "/usr/local/lib/python2.7/posixpath.py", line 381, in _joinrealpath
    if isabs(rest):
  File "/usr/local/lib/python2.7/posixpath.py", line 54, in isabs
    return s.startswith('/')
AttributeError: 'NoneType' object has no attribute 'startswith'
Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines
Affected core subsystem(s)

build

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