[libnotify] build: Allow not to build tests

[Marc-Antoine Perennou <marcop src gnome org>]

commit da7a6a229b81501a15795d8766731b8523770959
Author: Quentin Glidic <sardemff7+git sardemff7 net>
Date:   Thu Nov 19 10:09:52 2015 +0100

    build: Allow not to build tests
    
    https://bugzilla.gnome.org/show_bug.cgi?id=634790
    
    Signed-off-by: Quentin Glidic <sardemff7+git sardemff7 net>

 Makefile.am  |    5 ++++-
 configure.ac |   10 +++++++++-
 2 files changed, 13 insertions(+), 2 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 9e12a02..3a28de2 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,6 +1,9 @@
 ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
 
-SUBDIRS = libnotify docs tools tests
+SUBDIRS = libnotify docs tools
+if TESTS_ENABLED
+SUBDIRS += tests
+endif
 
 pcdata_DATA = libnotify.pc
 pcdatadir = $(libdir)/pkgconfig
diff --git a/configure.ac b/configure.ac
index dcc1667..632e80d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -94,7 +94,14 @@ AC_SUBST([pkg_modules])
 PKG_CHECK_MODULES(PACKAGE, [$pkg_modules])
 
 tests_modules="gtk+-3.0 >= $REQ_GTK_VERSION"
-PKG_CHECK_MODULES(TESTS, [$tests_modules])
+AC_ARG_ENABLE(tests,
+       [AS_HELP_STRING([--disable-tests],
+       [Do not build tests])],
+       ,enable_tests=yes)
+if test x$enable_tests = xyes ; then
+       PKG_CHECK_MODULES(TESTS, [$tests_modules])
+fi
+AM_CONDITIONAL(TESTS_ENABLED, test x$enable_tests = xyes)
 
 GLIB_GENMARSHAL=`pkg-config --variable=glib_genmarshal glib-2.0`
 AC_SUBST(GLIB_GENMARSHAL)
@@ -210,6 +217,7 @@ echo "
        source code location:     ${srcdir}
        cflags:                   ${CFLAGS}
 
+        Build tests:              ${enable_tests}
         Build docs:               ${enable_docbook_docs}
 
 "