petitboot: Add --with-twin config option

Make the build of the GUI components conditional on the installation
of libtwin.  Also, add options --with-twin and --without-twin to allow the
user to override the default.

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

diff --git a/configure.ac b/configure.ac
index 88e5833ca213fa0897688ed6d9779d4ce4c72343..467104a67fd75a390a6b00c87962a87f976ed5a0 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -29,7 +29,25 @@ fi
 AC_PROG_CC
 AC_PROG_INSTALL
 
-PKG_CHECK_MODULES([twin], [libtwin])
+AC_ARG_WITH([twin],
+       [AS_HELP_STRING([--with-twin],
+               [build GUI versions using the twin window system])],
+       [],
+       [with_twin=check])
+
+LIBTWIN=
+AS_IF([test "x$with_twin" != xno],
+       [PKG_CHECK_MODULES([twin], [libtwin], [],
+               [AC_MSG_RESULT([$twin_PKG_ERRORS])
+               AC_MSG_RESULT([Consider adjusting PKG_CONFIG_PATH environment variable])])
+       AC_CHECK_LIB([twin], [main],
+               [AC_SUBST([LIBTWIN], ["-ltwin"])
+                       AC_DEFINE([HAVE_LIBTWIN], [1], [Define if you have libtwin])],
+               [if test "x$with_twin" != xcheck; then
+                       AC_MSG_FAILURE([--with-twin was given, but test for twin failed])
+               fi],
+               [${twin_LIBS}])])
+
 
 mkdir -p discover ui/test ui/common lib/talloc lib/pb-protocol lib/list \
              lib/waiter lib/log