bootstrap.sh not compatible with python3.

[Robert Park <rbpark@…>]

Just tried building boost with python3 support and hit a small snag with bootstrap.sh using invalid syntax.

On line 280, the print statement has been removed from python3 so you need to use the print *function* instead, with brackets:

PYTHON_ROOT=$PYTHON -c "import sys; print(sys.prefix)"

This change does not break compatibility with python2.

[Ralf W. Grosse-Kunstleve]

hi stefan, do you know how to best deal with this problem?

[Robert Park <rbpark@…>]

Sorry, I should clarify: The line of code that I quote in the description is the *fix*, not the problem.

[Ralf W. Grosse-Kunstleve]

It turns out Stefan checked in the fix already in October last year (r75012) on the trunk. It still isn't merged into the release branch (the current revision is r78689). I don't know who is in charge of merging this file from the trunk to the release branch. Stefan?

[Jacobo Cabaleiro <jcc@…>]

I've just built 1.55 under mingw and this is still a problem.

ticket:5677 is a previous report of the same error.

[John McGehee]

A workaround is to get the Python root yourself with correct Python 3 syntax and tell bootstrap.py explicitly:

python_root=`python -c "import sys; print(sys.prefix)"`
./bootstrap.sh  --with-python-root=$python_root

[James E. King, III]

This was resolved in 1.59.0:

​https://github.com/boostorg/boost/commit/51e693134f5c354f2694fe89d14421c85bfacf31#diff-3af436e6760a0c5f1e3d16a3384853a8

I cannot set the milestone to 1.59.0 however so I am going to leave it unresolved until someone with access can.