Kbuild: skip cc-wrapper while finding version info

The version check script introduced by 'commit 83f55e6f298e
("kbuild: check the minimum assembler version in Kconfig")'
fails with cc-wrapper so use build tools directly to get
version details.

Change-Id: I1019b49eff5a885ad8e36a421dce6119862b0fb1
Signed-off-by: Srinivasarao Pathipati <[email protected]>

Makefile

@@ -534,6 +534,8 @@ KBUILD_CFLAGS_MODULE  := -DMODULE
 KBUILD_LDFLAGS_MODULE :=
 KBUILD_LDFLAGS :=
 CLANG_FLAGS :=
+# For use when analysis needs to call subshell with CC before cc-wrapper is built.
+NO_WRAPPER_CC := $(CC)
 
 CC := scripts/basic/cc-wrapper $(CC)
 
@@ -550,6 +552,7 @@ export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 export PAHOLE_FLAGS
+export NO_WRAPPER_CC
 
 # Files to ignore in find ... statements
 
@@ -596,7 +599,8 @@ endif
 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
-CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
+# cc-wrapper may not yet be compiled, use NO_WRAPPER_CC.
+CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(NO_WRAPPER_CC) --version 2>/dev/null | head -n 1))
 
 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
 include $(srctree)/scripts/Makefile.clang

scripts/Kconfig.include

@@ -52,7 +52,8 @@ ld-name := $(shell,set -- $(ld-info) && echo $1)
 ld-version := $(shell,set -- $(ld-info) && echo $2)
 
 # Get the assembler name, version, and error out if it is not supported.
-as-info := $(shell,$(srctree)/scripts/as-version.sh $(CC) $(CLANG_FLAGS))
+# cc-wrapper may not yet be compiled, use NO_WRAPPER_CC.
+as-info := $(shell,$(srctree)/scripts/as-version.sh $(NO_WRAPPER_CC) $(CLANG_FLAGS))
 $(error-if,$(success,test -z "$(as-info)"),Sorry$(comma) this assembler is not supported.)
 as-name := $(shell,set -- $(as-info) && echo $1)
 as-version := $(shell,set -- $(as-info) && echo $2)