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jimjag pushed a commit to branch python3-dev
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The following commit(s) were added to refs/heads/python3-dev by this push:
new 7fa40e135d macOS configure: validate each Python 3 candidate's version
before selecting it
7fa40e135d is described below
commit 7fa40e135d950bfec6f59e39d2ee314aaf639a8a
Author: Jim Jagielski <[email protected]>
AuthorDate: Tue Jun 30 16:10:07 2026 -0400
macOS configure: validate each Python 3 candidate's version before
selecting it
The Darwin python-detection probe picked the first executable path that
existed, then hard-failed later if its hexversion was below the 3.11 floor.
On a host where /usr/bin/python3 is Apple's old Command Line Tools stub
(< 3.11) but a newer interpreter (Homebrew, MacPorts, pyenv) is available
via PATH, this meant configure errored out instead of finding the usable
one. Check each candidate's sys.hexversion inline and keep scanning until
one actually satisfies the floor.
---
main/configure.ac | 62 ++++++++++++++++++++++++++-----------------------------
1 file changed, 29 insertions(+), 33 deletions(-)
diff --git a/main/configure.ac b/main/configure.ac
index b5b4ffa3ec..e5212c8799 100644
--- a/main/configure.ac
+++ b/main/configure.ac
@@ -4032,55 +4032,51 @@ if test "$_os" = "Darwin" && test "$with_system_python"
!= "no"; then
with_system_python=yes
dnl Recent macOS releases no longer ship a usable Python under /usr/bin,
- dnl so probe the locations where a system/user Python is typically found:
- dnl the python.org framework build, Homebrew (Apple Silicon and Intel),
- dnl and the Command Line Tools python3. Fall back to whatever python3 or
- dnl python is on PATH.
+ dnl and even when python3 exists there it may be Apple's old CLT stub
+ dnl (< 3.11). Probe the locations where a system/user Python is typically
+ dnl found - the python.org framework build, Homebrew (Apple Silicon and
+ dnl Intel), and whatever python3 is first on PATH (MacPorts/pyenv/etc.) -
+ dnl and pick the first candidate that actually satisfies the 3.11 floor.
+ dnl hex version of Python 3.11.0 = 51118080
_python=""
for _python_candidate in \
"/Library/Frameworks/Python.framework/Versions/Current/bin/python3" \
"/Library/Frameworks/Python.framework/Versions/Current/bin/python" \
"/opt/homebrew/bin/python3" \
"/usr/local/bin/python3" \
+ `command -v python3 2>/dev/null` \
"/usr/bin/python3" \
"/usr/bin/python" ; do
if test -x "$_python_candidate"; then
- _python="$_python_candidate"
- break
+ _python_candidate_hexversion=`$_python_candidate -c "import sys;
print(sys.hexversion)" 2>/dev/null`
+ if test -n "$_python_candidate_hexversion" && \
+ test "$_python_candidate_hexversion" -ge 51118080 2>/dev/null;
then
+ _python="$_python_candidate"
+ break
+ fi
fi
done
if test -z "$_python"; then
- AC_PATH_PROGS([_python], [python3 python])
+ AC_MSG_ERROR([Python 3.11 or higher is required; install it (e.g. from
python.org or Homebrew), or configure with --without-system-python])
fi
- if test -z "$_python"; then
- AC_MSG_ERROR([no system python found; install Python (e.g. from
python.org or Homebrew), or configure with --without-system-python])
- fi
- AC_MSG_RESULT([compiling against system python ($_python)])
- _python_hexversion=`$_python -c "import sys; print(sys.hexversion);"`
+ _python_version=`$_python -c "import sys; print(sys.version);" | head -c 4`
+ AC_MSG_RESULT([compiling against system python ($_python, version
$_python_version)])
- dnl hex version of Python 3.11.0 = 51118080
- if test $_python_hexversion -ge 51118080 ; then
- _python_version=`$_python -c "import sys; print(sys.version);" | head
-c 4`
- AC_MSG_RESULT([compiling against system python (version
$_python_version)])
-
- _python_ver=`$_python -c "import sysconfig;
print(sysconfig.get_config_var('VERSION'));"`
-
- dnl Locate the headers. Prefer the framework/SDK locations, but fall
- dnl back to whatever include dir the interpreter itself reports (this
- dnl is what makes Homebrew and other non-framework installs work).
- if test -d
"/Library/Frameworks/Python.framework/Versions/$_python_ver/include/python$_python_ver";
then
-
PYTHON_CFLAGS="-I/Library/Frameworks/Python.framework/Versions/$_python_ver/include/python$_python_ver"
- elif test -d "$MACOSX_SDK_PATH/usr/include/python$_python_ver"; then
- PYTHON_CFLAGS="-I$MACOSX_SDK_PATH/usr/include/python$_python_ver"
- elif test -d
"$MACOSX_SDK_PATH/System/Library/Frameworks/Python.framework/Versions/$_python_ver/include/python$_python_ver";
then
-
PYTHON_CFLAGS="-I$MACOSX_SDK_PATH/System/Library/Frameworks/Python.framework/Versions/$_python_ver/include/python$_python_ver"
- else
- _python_inc=`$_python -c "import distutils.sysconfig;
print(distutils.sysconfig.get_python_inc());"`
- PYTHON_CFLAGS="-I$_python_inc"
- fi
+ _python_ver=`$_python -c "import sysconfig;
print(sysconfig.get_config_var('VERSION'));"`
+
+ dnl Locate the headers. Prefer the framework/SDK locations, but fall back
+ dnl to whatever include dir the interpreter itself reports (this is what
+ dnl makes Homebrew and other non-framework installs work).
+ if test -d
"/Library/Frameworks/Python.framework/Versions/$_python_ver/include/python$_python_ver";
then
+
PYTHON_CFLAGS="-I/Library/Frameworks/Python.framework/Versions/$_python_ver/include/python$_python_ver"
+ elif test -d "$MACOSX_SDK_PATH/usr/include/python$_python_ver"; then
+ PYTHON_CFLAGS="-I$MACOSX_SDK_PATH/usr/include/python$_python_ver"
+ elif test -d
"$MACOSX_SDK_PATH/System/Library/Frameworks/Python.framework/Versions/$_python_ver/include/python$_python_ver";
then
+
PYTHON_CFLAGS="-I$MACOSX_SDK_PATH/System/Library/Frameworks/Python.framework/Versions/$_python_ver/include/python$_python_ver"
else
- AC_MSG_ERROR([Python 3.11 or higher is required])
+ _python_inc=`$_python -c "import sysconfig;
print(sysconfig.get_path('include'));"`
+ PYTHON_CFLAGS="-I$_python_inc"
fi
dnl A framework build links against the Python framework; any other
