buildsys: add option to enable/disable building the examples

In a production system, the examples are not needed.

Add a configure option to disable building the examples.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

Makefile.am

@@ -1,11 +1,14 @@
 # Generic definitions
-SUBDIRS = lib doc utils examples
+SUBDIRS = lib doc utils
 if BUILD_TEST_TOOL
 SUBDIRS += test-tool
 endif
 if BUILD_TESTS
 SUBDIRS += tests
 endif
+if BUILD_EXAMPLES
+SUBDIRS += examples
+endif
 
 ACLOCAL_AMFLAGS =-I m4
 AUTOMAKE_OPTIONS = foreign subdir-objects

configure.ac

@@ -63,6 +63,14 @@ AC_ARG_ENABLE([tests],
 AM_CONDITIONAL([BUILD_TESTS],
                [expr "$ENABLE_TESTS" : yes > /dev/null 2>&1])
 
+AC_ARG_ENABLE([examples],
+              [AC_HELP_STRING([--enable-examples],
+                              [Enable building examples])],
+              [ENABLE_EXAMPLES=$enableval],
+              [ENABLE_EXAMPLES=yes])
+AM_CONDITIONAL([BUILD_EXAMPLES],
+               [expr "$ENABLE_EXAMPLES" : yes > /dev/null 2>&1])
+
 AC_CONFIG_HEADER(config.h)
 
 AC_CHECK_LIB([gcrypt], [gcry_control])