The Makefile in tools/ tries to find the "swig" utility by calling "which".
If nothing is found in the path, some versions of which will print an error
message:
$ make clean
which: no swig in (/usr/local/bin:/usr/bin:/bin)

This does not apply to all version of "which", though:
$ echo $0
bash
$ type which
which is aliased to `type -path'
$ which foo                             <== this version is OK
$ /usr/bin/which foo                    <== this one is chatty
/usr/bin/which: no foo in (/usr/local/bin:/usr/bin:/bin)
$ sh                                    <== make uses /bin/sh
sh-4.3$ which foo                       <== no alias here
which: no foo in (/usr/local/bin:/usr/bin:/bin)

This error message is rather pointless in our case, since we just have
this very check to care for this. So add stderr redirection to suppress
the message.

Signed-off-by: Andre Przywara <[email protected]>
---
 tools/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/Makefile b/tools/Makefile
index 9edb504..5b81dde 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -112,7 +112,7 @@ fit_check_sign-objs   := $(dumpimage-mkimage-objs) 
fit_check_sign.o
 # Build a libfdt Python module if swig is available
 # Use 'sudo apt-get install swig libpython-dev' to enable this
 hostprogs-$(CONFIG_SPL_OF_PLATDATA) += \
-       $(if $(shell which swig),_libfdt.so)
+       $(if $(shell which swig 2> /dev/null),_libfdt.so)
 _libfdt.so-sharedobjs += $(LIBFDT_OBJS)
 libfdt:
 
-- 
2.8.2

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