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From b10cf1561a638c835481ae923b571cb8f7350a89 Mon Sep 17 00:00:00 2001
From: Andrew Cooper <andrew.cooper3@citrix.com>
Date: Fri, 3 Mar 2023 08:01:21 +0100
Subject: [PATCH 55/89] xen: Fix Clang -Wunicode diagnostic when building
asm-macros
While trying to work around a different Clang-IAS bug (parent changeset), I
stumbled onto:
In file included from arch/x86/asm-macros.c:3:
./arch/x86/include/asm/spec_ctrl_asm.h:144:19: error: \u used with
no following hex digits; treating as '\' followed by identifier [-Werror,-Wunicode]
.L\@_fill_rsb_loop\uniq:
^
It turns out that Clang -E is sensitive to the file extension of the source
file it is processing. Furthermore, C explicitly permits the use of \u
escapes in identifier names, so the diagnostic would be reasonable in
principle if we trying to compile the result.
asm-macros should really have been .S from the outset, as it is ultimately
generating assembly, not C. Rename it, which causes Clang not to complain.
We need to introduce rules for generating a .i file from .S, and substituting
c_flags for a_flags lets us drop the now-redundant -D__ASSEMBLY__.
No functional change.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
master commit: 53f0d02040b1df08f0589f162790ca376e1c2040
master date: 2023-02-24 17:44:29 +0000
---
xen/Rules.mk | 6 ++++++
xen/arch/x86/Makefile | 2 +-
xen/arch/x86/{asm-macros.c => asm-macros.S} | 0
3 files changed, 7 insertions(+), 1 deletion(-)
rename xen/arch/x86/{asm-macros.c => asm-macros.S} (100%)
diff --git a/xen/Rules.mk b/xen/Rules.mk
index d6b7cec0a8..59072ae8df 100644
--- a/xen/Rules.mk
+++ b/xen/Rules.mk
@@ -273,6 +273,9 @@ $(filter %.init.o,$(obj-y) $(obj-bin-y) $(extra-y)): $(obj)/%.init.o: $(obj)/%.o
quiet_cmd_cpp_i_c = CPP $@
cmd_cpp_i_c = $(CPP) $(call cpp_flags,$(c_flags)) -MQ $@ -o $@ $<
+quiet_cmd_cpp_i_S = CPP $@
+cmd_cpp_i_S = $(CPP) $(call cpp_flags,$(a_flags)) -MQ $@ -o $@ $<
+
quiet_cmd_cc_s_c = CC $@
cmd_cc_s_c = $(CC) $(filter-out -Wa$(comma)%,$(c_flags)) -S $< -o $@
@@ -282,6 +285,9 @@ cmd_cpp_s_S = $(CPP) $(call cpp_flags,$(a_flags)) -MQ $@ -o $@ $<
$(obj)/%.i: $(src)/%.c FORCE
$(call if_changed_dep,cpp_i_c)
+$(obj)/%.i: $(src)/%.S FORCE
+ $(call if_changed_dep,cpp_i_S)
+
$(obj)/%.s: $(src)/%.c FORCE
$(call if_changed_dep,cc_s_c)
diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
index 177a2ff742..5accbe4c67 100644
--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -240,7 +240,7 @@ $(obj)/efi/buildid.o $(obj)/efi/relocs-dummy.o: ;
.PHONY: include
include: $(objtree)/arch/x86/include/asm/asm-macros.h
-$(obj)/asm-macros.i: CFLAGS-y += -D__ASSEMBLY__ -P
+$(obj)/asm-macros.i: CFLAGS-y += -P
$(objtree)/arch/x86/include/asm/asm-macros.h: $(obj)/asm-macros.i $(src)/Makefile
$(call filechk,asm-macros.h)
diff --git a/xen/arch/x86/asm-macros.c b/xen/arch/x86/asm-macros.S
similarity index 100%
rename from xen/arch/x86/asm-macros.c
rename to xen/arch/x86/asm-macros.S
--
2.40.0
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