1 files changed, 67 insertions, 0 deletions

diff --git a/m4/ac_pkg_cython.m4 b/m4/ac_pkg_cython.m4
new file mode 100644
index 0000000..e0af96a
--- /dev/null
+++ b/m4/ac_pkg_cython.m4
@@ -0,0 +1,67 @@
+
+AC_DEFUN([AC_PROG_CYTHON],[
+        AC_PATH_PROGS([CYTHON],[cython cython3])
+        if test -z "$CYTHON" ; then
+                AC_MSG_WARN([Unable to find 'cython' or 'cython3' program. You should look at https://cython.org or install your distribution specific cython package.])
+                CYTHON=false
+        elif test -n "$1" ; then
+                AC_MSG_CHECKING([for Cython version])
+                [cython_version=`$CYTHON --version 2>&1 | sed 's/Cython version \(.*\)$/\1/g'`]
+                AC_MSG_RESULT([$cython_version])
+
+                # Setup extra version string for parsing
+                [cython_version_stripped=`echo $cython_version | sed 's/\([0-9]\+\)\.\([0-9]\+\)[^\.]*\(\.\([0-9]\+\)\)\?.*/0\1.0\2.0\4/g'`]
+                if test -n "$cython_version" ; then
+                        # Calculate the required version number components
+                        [required=$1]
+                        [required_major=`echo $required | sed 's/[^0-9].*//'`]
+                        if test -z "$required_major" ; then
+                                [required_major=0]
+                        fi
+                        [required=`echo $required | sed 's/[0-9]*[^0-9]//'`]
+                        [required_minor=`echo $required | sed 's/[^0-9].*//'`]
+                        if test -z "$required_minor" ; then
+                                [required_minor=0]
+                        fi
+                        [required=`echo $required | sed 's/[0-9]*[^0-9]//'`]
+                        [required_patch=`echo $required | sed 's/[^0-9].*//'`]
+                        if test -z "$required_patch" ; then
+                                [required_patch=0]
+                        fi
+
+                        # Calculate the available version number components
+                        [available=$cython_version_stripped]
+                        [available_major=`echo $available | sed 's/[^0-9].*//'`]
+                        if test -z "$available_major" ; then
+                                [available_major=0]
+                        fi
+                        [available=`echo $available | sed 's/[0-9]*[^0-9]//'`]
+                        [available_minor=`echo $available | sed 's/[^0-9].*//'`]
+                        if test -z "$available_minor" ; then
+                                [available_minor=0]
+                        fi
+                        [available=`echo $available | sed 's/[0-9]*[^0-9]//'`]
+                        [available_patch=`echo $available | sed 's/[^0-9].*//'`]
+                        if test -z "$available_patch" ; then
+                                [available_patch=0]
+                        fi
+
+                        if test $available_major -gt $required_major || \
+                                ( test $available_major -eq $required_major && \
+                                      test $available_minor -gt $required_minor ) || \
+                                ( test $available_major -eq $required_major && \
+                                        test $available_minor -eq $required_minor && \
+                                        test $available_patch -ge $required_patch ) ; then
+
+                                AC_MSG_NOTICE([Cython executable is '$CYTHON'])
+                        else
+                                AC_MSG_WARN([Cython version >= $1 is required.  You have $cython_version.  You should look at http://www.cython.org])
+                                CYTHON='echo "Error: Cython version >= $1 is required.  You have '"$cython_version"'.  You should look at http://www.cython.org" ; false'
+                        fi
+                else
+                        AC_MSG_WARN([Unable to determine Cython version])
+                        CYTHON=false
+                fi
+        fi
+        AC_SUBST([CYTHON_LIB])
+])