m4/gst-parser.m4: check for bison and flex

Original commit message from CVS:
* m4/gst-parser.m4:
check for bison and flex

diff --git a/ChangeLog b/ChangeLog
index b8639f3..8be5379 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2006-07-21  Stefan Kost  <ensonic@users.sf.net>
+
+       * m4/gst-parser.m4:
+         check for bison and flex
+
 2006-07-13  Thomas Vander Stichele  <thomas at apestaart dot org>
 
        * m4/gst-plugin-docs.m4:

diff --git a/m4/gst-parser.m4 b/m4/gst-parser.m4
new file mode 100644 (file)
index 0000000..eb1b9a4
--- /dev/null
+++ b/m4/gst-parser.m4
@@ -0,0 +1,57 @@
+AC_DEFUN([GST_BISON_CHECK],
+[
+  dnl FIXME: check if AC_PROG_YACC is suitable here
+  dnl FIXME: make precious
+  AC_PATH_PROG(BISON_PATH, bison, no)
+  if test x$BISON_PATH = xno; then
+    AC_MSG_ERROR(Could not find bison)
+  fi
+
+  dnl check bison version
+  bison_min_version=1.35
+  bison_version=`$BISON_PATH --version | head -n 1 | sed 's/^.*) //'|cut -d' ' -f1`
+  AC_MSG_CHECKING([bison version $bison_version >= $bison_min_version])
+
+  if perl -w <<EOF
+    exit ($bison_version < $bison_min_version) ? 0 : 1;
+EOF 
+  then 
+    AC_MSG_RESULT([yes])
+  else 
+    AC_MSG_RESULT([no])
+    AC_MSG_ERROR([Your bison version is too old, $bison_min_version or later is required.])
+  fi
+])
+
+AC_DEFUN([GST_FLEX_CHECK],
+[
+  dnl we require flex for building the parser
+  dnl FIXME: check if AC_PROG_LEX is suitable here
+  AC_PATH_PROG(FLEX_PATH, flex, no)
+  if test x$FLEX_PATH = xno; then
+    AC_MSG_ERROR(Could not find flex)
+  fi
+  
+  dnl check flex version
+  flex_min_version=2.5.6
+  flex_version=`$FLEX_PATH --version | head -n 1 | sed 's/^.* //'|cut -d' ' -f1`
+  AC_MSG_CHECKING([flex version $flex_version >= $flex_min_version])
+  if perl -w <<EOF
+    (\$min_version_major, \$min_version_minor, \$min_version_micro ) = "$flex_min_version" =~ /(\d+)\.(\d+)\.(\d+)/;
+    (\$flex_version_major, \$flex_version_minor, \$flex_version_micro ) = "$flex_version" =~ /(\d+)\.(\d+)\.(\d+)/;
+    exit (((\$flex_version_major > \$min_version_major) ||
+     ((\$flex_version_major == \$min_version_major) &&
+      (\$flex_version_minor >= \$min_version_minor)) ||
+     ((\$flex_version_major == \$min_version_major) &&
+      (\$flex_version_minor >= \$min_version_minor) &&
+      (\$flex_version_micro >= \$min_version_micro)))
+     ? 0 : 1);
+EOF
+  then
+    AC_MSG_RESULT(yes)
+    AC_DEFINE(HAVE_MT_SAVE_FLEX, 1,
+      [Defined if we have recent enough flex, which is MT save])
+  else
+    AC_MSG_RESULT(no)
+  fi
+])