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-rwxr-xr-xx.py59
1 files changed, 40 insertions, 19 deletions
diff --git a/x.py b/x.py
index 5dee953a3..6c4c10681 100755
--- a/x.py
+++ b/x.py
@@ -4,26 +4,47 @@
# This file is only a "symlink" to bootstrap.py, all logic should go there.
-import os
-import sys
-
-# If this is python2, check if python3 is available and re-execute with that
-# interpreter. Only python3 allows downloading CI LLVM.
-#
-# This matters if someone's system `python` is python2.
-if sys.version_info.major < 3:
- try:
- os.execvp("py", ["py", "-3"] + sys.argv)
- except OSError:
+# Parts of `bootstrap.py` use the `multiprocessing` module, so this entry point
+# must use the normal `if __name__ == '__main__':` convention to avoid problems.
+if __name__ == '__main__':
+ import os
+ import sys
+ import warnings
+ from inspect import cleandoc
+
+ major = sys.version_info.major
+ minor = sys.version_info.minor
+
+ # If this is python2, check if python3 is available and re-execute with that
+ # interpreter. Only python3 allows downloading CI LLVM.
+ #
+ # This matters if someone's system `python` is python2.
+ if major < 3:
try:
- os.execvp("python3", ["python3"] + sys.argv)
+ os.execvp("py", ["py", "-3"] + sys.argv)
except OSError:
- # Python 3 isn't available, fall back to python 2
- pass
+ try:
+ os.execvp("python3", ["python3"] + sys.argv)
+ except OSError:
+ # Python 3 isn't available, fall back to python 2
+ pass
+
+ # soft deprecation of old python versions
+ skip_check = os.environ.get("RUST_IGNORE_OLD_PYTHON") == "1"
+ if not skip_check and (major < 3 or (major == 3 and minor < 6)):
+ msg = cleandoc("""
+ Using python {}.{} but >= 3.6 is recommended. Your python version
+ should continue to work for the near future, but this will
+ eventually change. If python >= 3.6 is not available on your system,
+ please file an issue to help us understand timelines.
+
+ This message can be suppressed by setting `RUST_IGNORE_OLD_PYTHON=1`
+ """.format(major, minor))
+ warnings.warn(msg, stacklevel=1)
-rust_dir = os.path.dirname(os.path.abspath(__file__))
-# For the import below, have Python search in src/bootstrap first.
-sys.path.insert(0, os.path.join(rust_dir, "src", "bootstrap"))
+ rust_dir = os.path.dirname(os.path.abspath(__file__))
+ # For the import below, have Python search in src/bootstrap first.
+ sys.path.insert(0, os.path.join(rust_dir, "src", "bootstrap"))
-import bootstrap
-bootstrap.main()
+ import bootstrap
+ bootstrap.main()