[PATCH v6 02/10] x86: move back clang no integrated assembler tests

[Jan Beulich <jbeulich@xxxxxxxx>]

This largely reverts f19af2f1138e ("x86: re-order clang no integrated
assembler tests"): Other CFLAGS setup would better happen first, in case
any of it affects the behavior of the integrated assembler. The comment
addition of course doesn't get undone. The only remaining as-option-add
invocation gets moved down in addition.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
v5: Re-base.
v4: New.

--- a/xen/arch/x86/Rules.mk
+++ b/xen/arch/x86/Rules.mk
@@ -12,35 +12,8 @@ CFLAGS += '-D__OBJECT_LABEL__=$(subst /,
 # Prevent floating-point variables from creeping into Xen.
 CFLAGS += -msoft-float
 
-ifeq ($(CONFIG_CC_IS_CLANG),y)
-# Note: Any test which adds -no-integrated-as will cause subsequent tests to
-# succeed, and not trigger further additions.
-#
-# The tests to select whether the integrated assembler is usable need to happen
-# before testing any assembler features, or else the result of the tests would
-# be stale if the integrated assembler is not used.
-
-# Older clang's built-in assembler doesn't understand .skip with labels:
-# https://bugs.llvm.org/show_bug.cgi?id=27369
-$(call as-option-add,CFLAGS,CC,".L0: .L1: .skip (.L1 - .L0)",,\
-                     -no-integrated-as)
-
-# Check whether clang asm()-s support .include.
-$(call as-option-add,CFLAGS,CC,".include \"asm-x86/indirect_thunk_asm.h\"",,\
-                     -no-integrated-as)
-
-# Check whether clang keeps .macro-s between asm()-s:
-# https://bugs.llvm.org/show_bug.cgi?id=36110
-$(call as-option-add,CFLAGS,CC,\
-                     ".macro FOO;.endm"$$(close); asm volatile $$(open)".macro 
FOO;.endm",\
-                     -no-integrated-as)
-endif
-
 $(call cc-options-add,CFLAGS,CC,$(EMBEDDED_EXTRA_CFLAGS))
 $(call cc-option-add,CFLAGS,CC,-Wnested-externs)
-$(call as-option-add,CFLAGS,CC,".equ \"x\"$$(comma)1", \
-                     -U__OBJECT_LABEL__ -DHAVE_AS_QUOTED_SYM \
-                     '-D__OBJECT_LABEL__=$(subst $(BASEDIR)/,,$(CURDIR))/$$@')
 
 CFLAGS += -mno-red-zone -fpic -fno-asynchronous-unwind-tables
 
@@ -70,3 +43,30 @@ endif
 # Set up the assembler include path properly for older toolchains.
 CFLAGS += -Wa,-I$(BASEDIR)/include
 
+ifeq ($(CONFIG_CC_IS_CLANG),y)
+# Note: Any test which adds -no-integrated-as will cause subsequent tests to
+# succeed, and not trigger further additions.
+#
+# The tests to select whether the integrated assembler is usable need to happen
+# before testing any assembler features, or else the result of the tests would
+# be stale if the integrated assembler is not used.
+
+# Older clang's built-in assembler doesn't understand .skip with labels:
+# https://bugs.llvm.org/show_bug.cgi?id=27369
+$(call as-option-add,CFLAGS,CC,".L0: .L1: .skip (.L1 - .L0)",,\
+                     -no-integrated-as)
+
+# Check whether clang asm()-s support .include.
+$(call as-option-add,CFLAGS,CC,".include \"asm-x86/indirect_thunk_asm.h\"",,\
+                     -no-integrated-as)
+
+# Check whether clang keeps .macro-s between asm()-s:
+# https://bugs.llvm.org/show_bug.cgi?id=36110
+$(call as-option-add,CFLAGS,CC,\
+                     ".macro FOO;.endm"$$(close); asm volatile $$(open)".macro 
FOO;.endm",\
+                     -no-integrated-as)
+endif
+
+$(call as-option-add,CFLAGS,CC,".equ \"x\"$$(comma)1", \
+                     -U__OBJECT_LABEL__ -DHAVE_AS_QUOTED_SYM \
+                     '-D__OBJECT_LABEL__=$(subst $(BASEDIR)/,,$(CURDIR))/$$@')