fix #481: ensure liblz4.a dependency for `make all`

`make all` will trigger several sub-directory makefiles.
several of them need `liblz4.a`.
When built with `-j#`, there are several concurrent liblz4.a built

Make liblz4.a a dependency, which is built once,
before moving to sub-directory Makefiles

1 files changed, 2 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 8a7d155..ff84d6d 100644
--- a/Makefile
+++ b/Makefile
@@ -56,6 +56,7 @@ all: allmost manuals
 allmost: lib lz4 examples
 
 .PHONY: lib lib-release liblz4.a
+lib: liblz4.a
 lib lib-release liblz4.a:
 	@$(MAKE) -C $(LZ4DIR) $@
 
@@ -67,7 +68,7 @@ lz4 lz4-release :
 	@cp $(PRGDIR)/lz4$(EXT) .
 
 .PHONY: examples
-examples:
+examples: liblz4.a
 	$(MAKE) -C $(EXDIR) all
 
 .PHONY: manuals