Makefile: evaluate CCACHE and HOST{CC, CXX} at time of use

As we are going to move to per-package SDK, the location of CCACHE and
therefore the definitions of HOSTCC and HOSTCXX need to be evaluated
at the time of use and not at the time of assignment. Indeed, the
value of HOST_DIR changes from one package to the other.

Therefore, we need to change from := to =.

In addition, while doing A := $(something) $(A) is possible, doing A =
$(something) $(A) is not legal. So, instead of defining HOSTCC in
terms of the current HOSTCC variable, we re-use HOSTCC_NOCCACHE
instead.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

diff --git a/Makefile b/Makefile
index 94adff3406ca378ea01bbbf91c6e782d37dd49fb..2819d441241ccdb2f3a7626cd08a8b8c6cea8b11 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -471,11 +471,11 @@ BR_PATH = "$(HOST_DIR)/bin:$(HOST_DIR)/sbin:$(PATH)"
 TARGET_DIR_WARNING_FILE = $(BASE_TARGET_DIR)/THIS_IS_NOT_YOUR_ROOT_FILESYSTEM
 
 ifeq ($(BR2_CCACHE),y)
-CCACHE := $(HOST_DIR)/bin/ccache
+CCACHE = $(HOST_DIR)/bin/ccache
 BR_CACHE_DIR ?= $(call qstrip,$(BR2_CCACHE_DIR))
 export BR_CACHE_DIR
-HOSTCC := $(CCACHE) $(HOSTCC)
-HOSTCXX := $(CCACHE) $(HOSTCXX)
+HOSTCC = $(CCACHE) $(HOSTCC_NOCCACHE)
+HOSTCXX = $(CCACHE) $(HOSTCXX_NOCCACHE)
 else
 export BR_NO_CCACHE
 endif