[PATCH v3 01/16] Makefile: detect HOST_ARCH properly when CROSS_COMPILE is multi-word

[Jerome Forissier]

When CROSS_COMPILE contains multiple words, HOST_ARCH is not properly
detected and the sandbox build fail. It typically happens when using
ccache. For example:

 $ make sandbox_defconfig
 $ make CROSS_COMPILE="ccache x86_64-linux-gnu-" \
        CC="ccache x86_64-linux-gnu-gcc"
 [...]
 In file included from boot/bootmeth_efi.c:16:
 include/efi_default_filename.h:33:2: error: #error Unsupported UEFI architecture
    33 | #error Unsupported UEFI architecture
       |  ^~~~~

A similar error occurs when the build is done via buildman and
~/.buildman contains:

  [toolchain-wrapper]
  wrapper = ccache

Fix the issue by considering only the last word in $(CROSS_COMPILE).

Signed-off-by: Jerome Forissier <jerome.forissier at linaro.org>
Reviewed-by: Peter Robinson <pbrobinson at gmail.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
Reviewed-by: Peter Robinson <pbrobinson at gmail.com>
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index f90e48f58a5..dc7bdd79420 100644
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,7 @@ include include/host_arch.h
 ifeq ("", "$(CROSS_COMPILE)")
   MK_ARCH="${shell uname -m}"
 else
-  MK_ARCH="${shell echo $(CROSS_COMPILE) | sed -n 's/^[[:space:]]*\([^\/]*\/\)*\([^-]*\)-[^[:space:]]*/\2/p'}"
+  MK_ARCH="${shell echo ${lastword $(CROSS_COMPILE)} | sed -n 's/^[[:space:]]*\([^\/]*\/\)*\([^-]*\)-[^[:space:]]*/\2/p'}"
 endif
 unexport HOST_ARCH
 ifeq ("x86_64", $(MK_ARCH))
-- 
2.40.1