lib: descend into sub directories only when it is necessary
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/Makefile b/Makefile
index 1f499c5..e12f180 100644
--- a/Makefile
+++ b/Makefile
@@ -232,10 +232,10 @@
HAVE_VENDOR_COMMON_LIB = $(if $(wildcard board/$(VENDOR)/common/Makefile),y,n)
LIBS-y += lib/libgeneric.o
-LIBS-y += lib/rsa/librsa.o
-LIBS-y += lib/lzma/liblzma.o
-LIBS-y += lib/lzo/liblzo.o
-LIBS-y += lib/zlib/libz.o
+LIBS-$(CONFIG_RSA) += lib/rsa/librsa.o
+LIBS-$(CONFIG_LZMA) += lib/lzma/liblzma.o
+LIBS-$(CONFIG_LZO) += lib/lzo/liblzo.o
+LIBS-$(CONFIG_ZLIB) += lib/zlib/libz.o
LIBS-$(CONFIG_TIZEN) += lib/tizen/libtizen.o
LIBS-$(HAVE_VENDOR_COMMON_LIB) += board/$(VENDOR)/common/lib$(VENDOR).o
LIBS-y += $(CPUDIR)/lib$(CPU).o