From: Johannes Berg <redacted>

If all net/wireless/certs/*.hex files are deleted, the build
will hang at this point since the 'cat' command will have no
arguments. Do "echo | cat - ..." so that even if the "..."
part is empty, the whole thing won't hang.

Signed-off-by: Johannes Berg <redacted>
Signed-off-by: Luca Coelho <redacted>
---
 net/wireless/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/wireless/Makefile b/net/wireless/Makefile
index 2eee93985ab0..af590ae606b6 100644
--- a/net/wireless/Makefile
+++ b/net/wireless/Makefile

@@ -28,7 +28,7 @@ $(obj)/shipped-certs.c: $(wildcard $(srctree)/$(src)/certs/*.hex)
 	@$(kecho) "  GEN     $@"
 	@(echo '#include "reg.h"'; \
 	  echo 'const u8 shipped_regdb_certs[] = {'; \
-	  cat $^ ; \
+	  echo | cat - $^ ; \
 	  echo '};'; \
 	  echo 'unsigned int shipped_regdb_certs_len = sizeof(shipped_regdb_certs);'; \
 	 ) > $@

-- 
2.32.0