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# FIND_PYTHON
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# -----------
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-# Find the version of `python` to use (for the testsuite driver)
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+# Find a usable Python interpreter and enforce a minimum version.
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+# Exports:
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+# - PYTHON: Path to the interpreter for build/test scripts
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+# - PythonCmd: Canonicalised path used by Hadrian and config files
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+# - PythonVersion: Detected Python version (X.Y.Z)
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#
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AC_DEFUN([FIND_PYTHON],[
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dnl Prefer the mingw64 distribution on Windows due to #17483.
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AC_PATH_PROG([PYTHON], [python3], [], [/mingw64/bin $PATH])
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+
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+ dnl Fall back to "python" if python3 isn’t found (version checked below)
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+ AS_IF([test -z "$PYTHON"], [
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+ AC_PATH_PROG([PYTHON], [python], [], [/mingw64/bin $PATH])
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+ ])
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+
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+ dnl If still not found, hard error: we require Python >= 3.7
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+ AS_IF([test -z "$PYTHON"], [
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+ AC_MSG_ERROR([Python 3.7 or later is required but no python interpreter was found. Please install Python >= 3.7 and re-run configure.])
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+ ])
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+
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+ dnl Query the version string (X.Y.Z) of the selected interpreter
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+ AC_CACHE_CHECK([for version of python], [fp_cv_python_version], [
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+ changequote(, )dnl
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+ fp_cv_python_version=`"$PYTHON" -c "import sys; sys.stdout.write('%d.%d.%d' % sys.version_info[:3])" 2>/dev/null`
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+ changequote([, ])dnl
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+ ])
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+ PythonVersion=$fp_cv_python_version
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+ AC_SUBST([PythonVersion])
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+
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+ dnl Enforce minimum version 3.7.0
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+ AS_IF([test -z "$PythonVersion"], [
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+ AC_MSG_ERROR([Failed to determine Python version for $PYTHON])
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+ ])
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+ FP_COMPARE_VERSIONS([$PythonVersion], [-lt], [3.7.0], [
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+ AC_MSG_ERROR([Python 3.7 or later is required, but $PYTHON reports $PythonVersion])
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+ ])
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+
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+ dnl Canonicalise path for Windows
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if test "$HostOS" = "mingw32"
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then
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PythonCmd=$(cygpath -m "$PYTHON")
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