powerpc/boot: Use clang when CC is clang

The gcc compiler may not be available if CC is clang.

Signed-off-by: Bill Wendling <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: bwendling

arch/powerpc/boot/Makefile

@@ -21,7 +21,11 @@
 all: $(obj)/zImage
 
 ifdef CROSS32_COMPILE
+ifdef CONFIG_CC_IS_CLANG
+    BOOTCC := $(CROSS32_COMPILE)clang
+else
     BOOTCC := $(CROSS32_COMPILE)gcc
+endif
     BOOTAR := $(CROSS32_COMPILE)ar
 else
     BOOTCC := $(CC)