Make checking for python more predictable.

Signed-off-by: Bryan Hundven <bryanhundven@gmail.com>

2 files changed, 128 insertions, 0 deletions

diff --git a/m4/ctng_python.m4 b/m4/ctng_python.m4
new file mode 100644
index 00000000..5e04f377
--- /dev/null
+++ b/m4/ctng_python.m4
@@ -0,0 +1,111 @@
+# ===========================================================================
+#   Based on:  https://www.gnu.org/software/autoconf-archive/ctng_python.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   CTNG_PYTHON
+#
+# DESCRIPTION
+#
+#   This macro does a complete Python development environment check.
+#
+#   It checks for all known versions. When it finds an executable, it looks
+#   to find the header files and library.
+#
+#   It sets PYTHON_BIN to the name of the python executable,
+#   PYTHON_INCLUDE_DIR to the directory holding the header files, and
+#   PYTHON_LIB to the name of the Python library.
+#
+#   This macro calls AC_SUBST on PYTHON_BIN (via AC_CHECK_PROG),
+#   PYTHON_INCLUDE_DIR and PYTHON_LIB.
+#
+#   Also calls CTNG_SET_KCONFIG_OPTION to set KCONFIG_python for
+#   crosstool-ng.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Michael Tindal
+#   Copyright (c) 2023 Bryan Hundven
+#
+#   This program is free software; you can redistribute it and/or modify it
+#   under the terms of the GNU General Public License as published by the
+#   Free Software Foundation; either version 2 of the License, or (at your
+#   option) any later version.
+#
+#   This program is distributed in the hope that it will be useful, but
+#   WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+#   Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License along
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
+#
+#   As a special exception, the respective Autoconf Macro's copyright owner
+#   gives unlimited permission to copy, distribute and modify the configure
+#   scripts that are the output of Autoconf when processing the Macro. You
+#   need not follow the terms of the GNU General Public License when using
+#   or distributing such scripts, even though portions of the text of the
+#   Macro appear in them. The GNU General Public License (GPL) does govern
+#   all other use of the material that constitutes the Autoconf Macro.
+#
+#   This special exception to the GPL applies to versions of the Autoconf
+#   Macro released by the Autoconf Archive. When you make and distribute a
+#   modified version of the Autoconf Macro, you may extend this special
+#   exception to the GPL to apply to your modified version as well.
+
+#serial 21
+
+AC_DEFUN([CTNG_PYTHON],
+[
+  AC_MSG_CHECKING(for python build information)
+  AC_MSG_RESULT([])
+  for python in python3.12 python3.11 python3.10 python3.9 python3.8 python3.7 dnl
+python3.6 python3.5 python3.4 python3.3 python3.2 python3.1 python3.0 python2.7 dnl
+python2.6 python2.5 python2.4 python2.3 python2.2 python2.1 python; do
+    AC_CHECK_PROGS(PYTHON_BIN, [$python])
+    ctng_python_bin=$PYTHON_BIN
+    if test "$ctng_python_bin" != ""; then
+      AC_CHECK_LIB($ctng_python_bin, main, ctng_python_lib=$ctng_python_bin, ctng_python_lib=no)
+      if test "$ctng_python_lib" = "no"; then
+        AC_CHECK_LIB(${ctng_python_bin}m, main, ctng_python_lib=${ctng_python_bin}m, ctng_python_lib=no)
+      fi
+      if test "$ctng_python_lib" != "no"; then
+        $ctng_python_bin -c 'import sysconfig' 2>&1
+        if test $? -eq 0; then
+          ctng_python_header=$($ctng_python_bin -c "from sysconfig import get_config_var; print(get_config_var('CONFINCLUDEPY'))")
+        else
+          ctng_python_header=$($ctng_python_bin -c "from distutils.sysconfig import *; print(get_config_var('CONFINCLUDEPY'))")
+        fi
+        if test "$ctng_python_header" != ""; then
+          break;
+        fi
+      fi
+    fi
+  done
+
+  python=n
+  AS_IF([test "$ctng_python_bin" = ""],
+        ctng_python_bin=no,
+        python=y)
+  CTNG_SET_KCONFIG_OPTION([python])
+
+  AS_IF([test "$ctng_python_header" = ""],
+        ctng_python_header=no)
+
+  AS_IF([test "$ctng_python_lib" = ""],
+        ctng_python_lib=no)
+
+  AC_MSG_RESULT([  results of the Python check:])
+  AC_MSG_RESULT([    Binary:      $ctng_python_bin])
+  AC_MSG_RESULT([    Library:     $ctng_python_lib])
+  AC_MSG_RESULT([    Include Dir: $ctng_python_header])
+
+  AS_IF([test "$ctng_python_header" != "no"],
+        [PYTHON_INCLUDE_DIR=$ctng_python_header
+         AC_SUBST(PYTHON_INCLUDE_DIR)])
+
+  AS_IF([test "$ctng_python_lib" != "no"],
+        [PYTHON_LIB=$ctng_python_lib
+         AC_SUBST(PYTHON_LIB)])
+])dnl
diff --git a/m4/ctng_python_version.m4 b/m4/ctng_python_version.m4
new file mode 100644
index 00000000..b07cc368
--- /dev/null
+++ b/m4/ctng_python_version.m4
@@ -0,0 +1,17 @@
+# CTNG_PYTHON_VERSION([major],[minor])
+#
+# Check for at least a specific Major.Minor of python.
+# Don't error out if it isn't matched... Might go back on that.
+AC_DEFUN([CTNG_PYTHON_VERSION],
+[
+  AC_MSG_CHECKING(for python version greater than $1.$2)
+
+  pyvermajor=$($PYTHON_BIN -c "import sys; print(sys.version_info.major)")
+  pyverminor=$($PYTHON_BIN -c "import sys; print(sys.version_info.minor)")
+
+  AS_IF([test $pyvermajor -ge $1 -a $pyverminor -ge $2],
+        eval "python_$1_$2_or_newer=y"
+        [CTNG_SET_KCONFIG_OPTION([python_$1_$2_or_newer])
+        AC_MSG_RESULT([yes: ${pyvermajor}.${pyverminor}])],
+        AC_MSG_RESULT([no: ${pyvermajor}.${pyverminor}]))
+])dnl