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Fail to configure without an LLVM-friendly Python

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This addresses issue #2720. According to LLVM's documentation, it requires a
version of Python between 2.4 and 2.7. Without the proper version, LLVM fails
to build with cryptic errors. Prior to this commit, the configure script
checked for the `python` command in the environment, but didn't actually check
the version, which can cause problems e.g. on Linux distros where the default
is Python 3. Now the configure script always prefers to select a more specific
version of Python when available, in the order `python2.7` > `python2.6` >
`python2` > `python`, and will always check to ensure that the interpreter's
version is in the correct range.
This commit is contained in:
Ben Striegel 2012-06-25 20:18:09 -04:00
parent 6e6d20a40f
commit 6322eda35c
1 changed files with 6 additions and 1 deletions
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7
configure vendored
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@ -311,8 +311,13 @@ fi
step_msg "looking for build programs"
probe_need CFG_PERL perl
probe_need CFG_PYTHON python python2.6 python2 python3
probe_need CFG_CURL curl
probe_need CFG_PYTHON python2.7 python2.6 python2 python
python_version=$($CFG_PYTHON -V 2>&1)
if [ $(echo $python_version | grep -c '^Python 2\.[4567]') -ne 1 ]; then
err "Found $python_version, but LLVM requires Python 2.4-2.7"
fi
# If we have no git directory then we are probably a tarball distribution
# and shouldn't attempt to load submodules