Only build the libfdt python module if 'swig' is available

When swig is not available, we can still build correctly. So make this
optional. Add a comment about how to enable this build.

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/tools/Makefile b/tools/Makefile
index 2731b7a..421414b 100644 (file)
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -107,7 +107,10 @@ mkimage-objs   := $(dumpimage-mkimage-objs) mkimage.o
 fit_info-objs   := $(dumpimage-mkimage-objs) fit_info.o
 fit_check_sign-objs   := $(dumpimage-mkimage-objs) fit_check_sign.o
 
-hostprogs-$(CONFIG_SPL_OF_PLATDATA) += _libfdt.so
+# Build a libfdt Python module if swig is available
+# Use 'sudo apt-get install swig libpython-dev' to enable this
+hostprogs-$(CONFIG_SPL_OF_PLATDATA) += \
+       $(if $(shell which swig),_libfdt.so)
 _libfdt.so-sharedobjs += $(LIBFDT_OBJS)
 libfdt: