[Xen-changelog] [xen staging] xen: Move CONFIG_INDIRECT_THUNK to Kconfig

[patchbot@xxxxxxx]

commit c3333c3a5d1224513f801aed11953234851bbf96
Author:     Anthony PERARD <anthony.perard@xxxxxxxxxx>
AuthorDate: Wed Dec 11 13:55:06 2019 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Thu Jan 30 11:54:33 2020 +0000

    xen: Move CONFIG_INDIRECT_THUNK to Kconfig
    
    Now that Kconfig has the capability to run shell command when
    generating CONFIG_* we can use it in some cases to test CFLAGS.
    
    CONFIG_INDIRECT_THUNK is a good example that wants to exist both in
    Makefile and as a C macro, which Kconfig do. So use Kconfig to
    generate CONFIG_INDIRECT_THUNK and have the CFLAGS depends on that.
    
    Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/Kconfig  | 3 +++
 xen/arch/x86/Rules.mk | 4 +---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/Kconfig b/xen/arch/x86/Kconfig
index f853c04564..8149362bde 100644
--- a/xen/arch/x86/Kconfig
+++ b/xen/arch/x86/Kconfig
@@ -31,6 +31,9 @@ config ARCH_DEFCONFIG
        string
        default "arch/x86/configs/x86_64_defconfig"
 
+config INDIRECT_THUNK
+       def_bool $(cc-option,-mindirect-branch-register)
+
 menu "Architecture Features"
 
 source "arch/Kconfig"
diff --git a/xen/arch/x86/Rules.mk b/xen/arch/x86/Rules.mk
index 92fdbe9d68..a2c257fb95 100644
--- a/xen/arch/x86/Rules.mk
+++ b/xen/arch/x86/Rules.mk
@@ -71,11 +71,9 @@ CFLAGS += -DGCC_HAS_VISIBILITY_ATTRIBUTE
 endif
 
 # Compile with thunk-extern, indirect-branch-register if avaiable.
-ifneq ($(call cc-option,$(CC),-mindirect-branch-register,n),n)
+ifeq ($(CONFIG_INDIRECT_THUNK),y)
 CFLAGS += -mindirect-branch=thunk-extern -mindirect-branch-register
-CFLAGS += -DCONFIG_INDIRECT_THUNK
 CFLAGS += -fno-jump-tables
-export CONFIG_INDIRECT_THUNK=y
 endif
 
 # If supported by the compiler, reduce stack alignment to 8 bytes. But allow
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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