Add test program for C++ support

So that we don't regress

configure.ac

@@ -9,6 +9,7 @@ AC_PROG_CC
 AC_PROG_LIBTOOL
 AC_C_INLINE
 AM_PROG_CC_C_O
+AC_PROG_CXX
 AC_DEFINE([_GNU_SOURCE], [], [Use GNU extensions])
 
 # Library versioning

examples/Makefile.am

@@ -1,5 +1,5 @@
 INCLUDES = -I$(top_srcdir)
-noinst_PROGRAMS = verify_live enroll verify img_capture
+noinst_PROGRAMS = verify_live enroll verify img_capture cpp-test
 
 verify_live_SOURCES = verify_live.c
 verify_live_LDADD = ../libfprint/libfprint.la
@@ -13,6 +13,9 @@ verify_LDADD = ../libfprint/libfprint.la
 img_capture_SOURCES = img_capture.c
 img_capture_LDADD = ../libfprint/libfprint.la
 
+cpp_test_SOURCES = cpp-test.cpp
+cpp_test_LDADD = ../libfprint/libfprint.la
+
 if BUILD_X11_EXAMPLES
 noinst_PROGRAMS += img_capture_continuous
 

examples/cpp-test.cpp

@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <libfprint/fprint.h>
+
+int main (int argc, char **argv)
+{
+	fp_init ();
+	return 0;
+}