commit 48af32b8a2fc525cd9c8ce9e0d28cce5fa5d9401
author Mahesh Kumar Kalikot Veetil <mkalikot@codeaurora.org> Fri Feb 23 11:50:19 2018 -0800
committer snandini <snandini@codeaurora.org> Sun Feb 25 21:08:40 2018 -0800
tree 3b70cb3eed1cc7b9eaaa24dcbfe2c9224e73b70a
parent a73a51aca2b5e37e2d9686780f5013a196dd3b94

qcacld-3.0: Fix the incremental compilation

BUILD_TAG changes in each build, which makes all files to recompile.
Notify build system that BULD_TAG is only used in wlan_hdd_main.c. This
reduces the recompile time significantly.

Change-Id: I40952e75eeb951ce8a693c8130dbc55a4a92eff5
CRs-Fixed: 2195100

Kbuild

diff --git a/Kbuild b/Kbuild
index 1de5ab7..e02e751 100644
--- a/Kbuild
+++ b/Kbuild
@@ -2474,7 +2474,8 @@
 
 TIMESTAMP = $(shell date -u +'%Y-%m-%dT%H:%M:%SZ')
 BUILD_TAG = "$(TIMESTAMP); cld:$(CLD_IDS); cmn:$(CMN_IDS);"
-CDEFINES += -DBUILD_TAG=\"$(BUILD_TAG)\"
+# It's assumed that BUILD_TAG is used only in wlan_hdd_main.c
+CFLAGS_wlan_hdd_main.o += -DBUILD_TAG=\"$(BUILD_TAG)\"
 endif
 
 # Module information used by KBuild framework