Compute TARGET_TOOLCHAIN_ROOT from TARGET_TOOLS_PREFIX.
Sometimes TARGET_TOOLS_PREFIX is passed in as command line makefile
variable or environmental variable without TARGET_TOOLCHAIN_ROOT.
This change computes TARGET_TOOLCHAIN_ROOT from TARGET_TOOLS_PREFIX in
that case.
Change-Id: I0a37dc1f4d1e3e1951faeffd5e9f926f0a6614dd
diff --git a/core/config.mk b/core/config.mk
index 27a9f4b..47d675a 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -169,6 +169,14 @@
combo_target := TARGET_
include $(BUILD_SYSTEM)/combo/select.mk
+# Compute TARGET_TOOLCHAIN_ROOT from TARGET_TOOLS_PREFIX
+# if only TARGET_TOOLS_PREFIX is passed to the make command.
+ifndef TARGET_TOOLCHAIN_ROOT
+TARGET_TOOLCHAIN_ROOT := $(patsubst %/, %, $(dir $(TARGET_TOOLS_PREFIX)))
+TARGET_TOOLCHAIN_ROOT := $(patsubst %/, %, $(dir $(TARGET_TOOLCHAIN_ROOT)))
+TARGET_TOOLCHAIN_ROOT := $(wildcard $(TARGET_TOOLCHAIN_ROOT))
+endif
+
# Pick a Java compiler.
include $(BUILD_SYSTEM)/combo/javac.mk