tests: Conditional compilation of tests (including boost-based unit tests)

To compile tests, code needs to be configured with --with-tests option,
otherwise all tests are disabled.

Tests that are based on Boost's unit test framework are enabled only if
the framework is detected during the configure time.

Change-Id: Ia1768e24b088e4f19d2a8799c6d5baeabb2f44c5
diff --git a/m4/ax_boost_unit_test_framework.m4 b/m4/ax_boost_unit_test_framework.m4
new file mode 100644
index 0000000..1115f55
--- /dev/null
+++ b/m4/ax_boost_unit_test_framework.m4
@@ -0,0 +1,137 @@
+# ================================================================================
+#  http://www.gnu.org/software/autoconf-archive/ax_boost_unit_test_framework.html
+# ================================================================================
+#
+# SYNOPSIS
+#
+#   AX_BOOST_UNIT_TEST_FRAMEWORK
+#
+# DESCRIPTION
+#
+#   Test for Unit_Test_Framework library from the Boost C++ libraries. The
+#   macro requires a preceding call to AX_BOOST_BASE. Further documentation
+#   is available at <http://randspringer.de/boost/index.html>.
+#
+#   This macro calls:
+#
+#     AC_SUBST(BOOST_UNIT_TEST_FRAMEWORK_LIB)
+#
+#   And sets:
+#
+#     HAVE_BOOST_UNIT_TEST_FRAMEWORK
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Thomas Porschberg <thomas@randspringer.de>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 19
+
+AC_DEFUN([AX_BOOST_UNIT_TEST_FRAMEWORK],
+[
+	AC_ARG_WITH([boost-unit-test-framework],
+	AS_HELP_STRING([--with-boost-unit-test-framework@<:@=special-lib@:>@],
+                   [use the Unit_Test_Framework library from boost - it is possible to specify a certain library for the linker
+                        e.g. --with-boost-unit-test-framework=boost_unit_test_framework-gcc ]),
+        [
+        if test "$withval" = "no"; then
+			want_boost="no"
+        elif test "$withval" = "yes"; then
+            want_boost="yes"
+            ax_boost_user_unit_test_framework_lib=""
+        else
+		    want_boost="yes"
+		ax_boost_user_unit_test_framework_lib="$withval"
+		fi
+        ],
+        [want_boost="yes"]
+	)
+
+	if test "x$want_boost" = "xyes"; then
+        AC_REQUIRE([AC_PROG_CC])
+		CPPFLAGS_SAVED="$CPPFLAGS"
+		CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
+		export CPPFLAGS
+
+		LDFLAGS_SAVED="$LDFLAGS"
+		LDFLAGS="$LDFLAGS $BOOST_LDFLAGS"
+		export LDFLAGS
+
+        AC_CACHE_CHECK(whether the Boost::Unit_Test_Framework library is available,
+					   ax_cv_boost_unit_test_framework,
+        [AC_LANG_PUSH([C++])
+			 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[@%:@include <boost/test/unit_test.hpp>]],
+                                    [[using boost::unit_test::test_suite;
+							 test_suite* test= BOOST_TEST_SUITE( "Unit test example 1" ); return 0;]])],
+                   ax_cv_boost_unit_test_framework=yes, ax_cv_boost_unit_test_framework=no)
+         AC_LANG_POP([C++])
+		])
+		if test "x$ax_cv_boost_unit_test_framework" = "xyes"; then
+			AC_DEFINE(HAVE_BOOST_UNIT_TEST_FRAMEWORK,,[define if the Boost::Unit_Test_Framework library is available])
+            BOOSTLIBDIR=`echo $BOOST_LDFLAGS | sed -e 's/@<:@^\/@:>@*//'`
+
+            if test "x$ax_boost_user_unit_test_framework_lib" = "x"; then
+			saved_ldflags="${LDFLAGS}"
+                for monitor_library in `ls $BOOSTLIBDIR/libboost_unit_test_framework*.so* $BOOSTLIBDIR/libboost_unit_test_framework*.dylib* $BOOSTLIBDIR/libboost_unit_test_framework*.a* 2>/dev/null` ; do
+                    if test -r $monitor_library ; then
+                       libextension=`echo $monitor_library | sed 's,.*/,,' | sed -e 's;^lib\(boost_unit_test_framework.*\)\.so.*$;\1;' -e 's;^lib\(boost_unit_test_framework.*\)\.dylib.*$;\1;' -e 's;^lib\(boost_unit_test_framework.*\)\.a.*$;\1;'`
+                       ax_lib=${libextension}
+                       link_unit_test_framework="yes"
+                    else
+                       link_unit_test_framework="no"
+                    fi
+
+			    if test "x$link_unit_test_framework" = "xyes"; then
+                      BOOST_UNIT_TEST_FRAMEWORK_LIB="-l$ax_lib"
+                      AC_SUBST(BOOST_UNIT_TEST_FRAMEWORK_LIB)
+					  break
+				    fi
+                done
+                if test "x$link_unit_test_framework" != "xyes"; then
+                for libextension in `ls $BOOSTLIBDIR/boost_unit_test_framework*.dll* $BOOSTLIBDIR/boost_unit_test_framework*.a* 2>/dev/null  | sed 's,.*/,,' | sed -e 's;^\(boost_unit_test_framework.*\)\.dll.*$;\1;' -e 's;^\(boost_unit_test_framework.*\)\.a.*$;\1;'` ; do
+                     ax_lib=${libextension}
+				    AC_CHECK_LIB($ax_lib, exit,
+                                 [BOOST_UNIT_TEST_FRAMEWORK_LIB="-l$ax_lib"; AC_SUBST(BOOST_UNIT_TEST_FRAMEWORK_LIB) link_unit_test_framework="yes"; break],
+                                 [link_unit_test_framework="no"])
+				done
+                fi
+            else
+                link_unit_test_framework="no"
+			saved_ldflags="${LDFLAGS}"
+                for ax_lib in boost_unit_test_framework-$ax_boost_user_unit_test_framework_lib $ax_boost_user_unit_test_framework_lib ; do
+                   if test "x$link_unit_test_framework" = "xyes"; then
+                      break;
+                   fi
+                   for unittest_library in `ls $BOOSTLIBDIR/lib${ax_lib}.so* $BOOSTLIBDIR/lib${ax_lib}.a* 2>/dev/null` ; do
+                   if test -r $unittest_library ; then
+                       libextension=`echo $unittest_library | sed 's,.*/,,' | sed -e 's;^lib\(boost_unit_test_framework.*\)\.so.*$;\1;' -e 's;^lib\(boost_unit_test_framework.*\)\.a*$;\1;'`
+                       ax_lib=${libextension}
+                       link_unit_test_framework="yes"
+                    else
+                       link_unit_test_framework="no"
+                    fi
+
+				if test "x$link_unit_test_framework" = "xyes"; then
+                        BOOST_UNIT_TEST_FRAMEWORK_LIB="-l$ax_lib"
+                        AC_SUBST(BOOST_UNIT_TEST_FRAMEWORK_LIB)
+					    break
+				    fi
+                  done
+               done
+            fi
+            if test "x$ax_lib" = "x"; then
+                AC_MSG_ERROR(Could not find a version of the library!)
+            fi
+			if test "x$link_unit_test_framework" != "xyes"; then
+				AC_MSG_ERROR(Could not link against $ax_lib !)
+			fi
+		fi
+
+		CPPFLAGS="$CPPFLAGS_SAVED"
+	LDFLAGS="$LDFLAGS_SAVED"
+	fi
+])