check for C99 struct intializer support, and enter bindings/ subdir only if swig is installed

git-svn-id: https://hamlib.svn.sourceforge.net/svnroot/hamlib/trunk@1172 7ae35d74-ebe9-4afe-98af-79ac388436b8

Makefile.am

@@ -5,7 +5,7 @@ aclocal_DATA = hamlib.m4
 EXTRA_DIST = PLAN TODO LICENSE hamlib.m4 README.developer README.betatester
 
 SUBDIRS = include lib libltdl src @BACKEND_LIST@ @ROT_BACKEND_LIST@ \
-			@BINDING_LIST@ bindings tests doc
+			@BINDING_LIST@ @BINDINGS@ tests doc
 
 DIST_SUBDIRS = include lib libltdl src c++ tcl kylix perl bindings tests doc \
 	icom kenwood aor yaesu dummy pcr alinco uniden tentec kachina jrc \

configure.ac

@@ -136,6 +136,13 @@ AC_PROG_LIBTOOL
 dnl Configure libltdl
 AC_CONFIG_SUBDIRS(libltdl)
 
+dnl Check if C99 struct initializers are supported
+AC_MSG_CHECKING(whether C99 struct initializers are supported)
+AC_TRY_COMPILE(,struct{char a;int b;}s={.b=5};, [AC_MSG_RESULT(yes)],
+		[AC_MSG_ERROR( ""
+		"You need a C99 compliant C compiler that supports struct intializers."
+		"Have you considered GCC lately?.")]);
+
 
 dnl Check if libgd-dev is installed, so we can enable rigmatrix
 
@@ -305,6 +312,10 @@ AC_SUBST(ROT_BACKEND_LIST)
 AC_SUBST(ROT_BACKENDLNK)
 AC_SUBST(ROT_BACKENDEPS)
 
+BINDINGS=""
+AC_CHECK_PROG(BINDINGS, [swig], [bindings], [], [$PATH])
+AC_SUBST(BINDINGS)
+
 for bi in ${BINDING_LIST} ; do
     if test "${bi}" != "c++" -a "${bi}" != "kylix" ; then
     	BINDING_LA="${BINDING_LA} hamlib${bi}.la"