Windows port: Use an improved python.m4

- AM_CHECK_PYTHON_HEADERS macro now allows PYTHON_INCLUDES to be overridden
  from an environment variable and
- the new AM_CHECK_PYTHON_LIBS macro to check for ability to link against
  libpython. This also allows PYTHON_LIBS and PYTHON_LIB_LOC to be overridden
  from their respective environment variables.

This allows gobject-introspection to be built with MinGW/MSYS by doing:

PYTHON_DIR="/c/Python27"
SRC_DIR="/d/dev/gnome.org/checkout/gobject-introspection/src"
...
PYTHON_INCLUDES="-I${PYTHON_DIR}/include/" \
PYTHON_LIBS="-L${PYTHON_DIR}/libs/ -lpython${PYTHON_VERSION}" \
PYTHON_LIB_LOC="${PYTHON_DIR}/libs/" \
"${SRC_DIR}/configure" \

https://bugzilla.gnome.org/show_bug.cgi?id=620566

1 files changed, 29 insertions, 3 deletions

diff --git a/m4/python.m4 b/m4/python.m4
index aff55371..c939c43b 100644
--- a/m4/python.m4
+++ b/m4/python.m4
@@ -8,9 +8,11 @@ AC_MSG_CHECKING(for headers required to compile python extensions)
 dnl deduce PYTHON_INCLUDES
 py_prefix=`$PYTHON -c "import sys; print sys.prefix"`
 py_exec_prefix=`$PYTHON -c "import sys; print sys.exec_prefix"`
-PYTHON_INCLUDES="-I${py_prefix}/include/python${PYTHON_VERSION}"
-if test "$py_prefix" != "$py_exec_prefix"; then
-  PYTHON_INCLUDES="$PYTHON_INCLUDES -I${py_exec_prefix}/include/python${PYTHON_VERSION}"
+if test "x$PYTHON_INCLUDES" == x; then
+  PYTHON_INCLUDES="-I${py_prefix}/include/python${PYTHON_VERSION}"
+  if test "$py_prefix" != "$py_exec_prefix"; then
+    PYTHON_INCLUDES="$PYTHON_INCLUDES -I${py_exec_prefix}/include/python${PYTHON_VERSION}"
+  fi
 fi
 AC_SUBST(PYTHON_INCLUDES)
 dnl check if the headers exist:
@@ -23,3 +25,27 @@ $1],dnl
 $2])
 CPPFLAGS="$save_CPPFLAGS"
 ])
+
+dnl a macro to check for ability to link against libpython
+dnl  AM_CHECK_PYTHON_LIBS([ACTION-IF-POSSIBLE], [ACTION-IF-NOT-POSSIBLE])
+dnl function also defines PYTHON_LIBS
+AC_DEFUN([AM_CHECK_PYTHON_LIBS],
+[AC_REQUIRE([AM_CHECK_PYTHON_HEADERS])
+AC_MSG_CHECKING(for libraries required to link against libpython)
+dnl deduce PYTHON_LIBS
+if test "x$PYTHON_LIBS" == x; then
+	PYTHON_LIBS="-L${py_prefix}/lib -lpython${PYTHON_VERSION}"
+fi
+if test "x$PYTHON_LIB_LOC" == x; then
+	PYTHON_LIB_LOC="${py_prefix}/lib"
+fi
+AC_SUBST(PYTHON_LIBS)
+AC_SUBST(PYTHON_LIB_LOC)
+dnl check if libpython exist:
+save_LIBS="$LIBS"
+LIBS="$LIBS $PYTHON_LIBS"
+AC_TRY_LINK_FUNC(Py_Initialize, dnl
+         [LIBS="$save_LIBS"; AC_MSG_RESULT(found); $1], dnl
+         [LIBS="$save_LIBS"; AC_MSG_RESULT(not found); $2])
+
+])