blob: 1196a76b0f7d6753ccaae11061554f8aeccefdb7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
From c4850e7fee85527976519f6d55685706d41cb91b Mon Sep 17 00:00:00 2001
From: Sami Tolvanen <samitolvanen@google.com>
Date: Wed, 10 Apr 2019 14:17:20 -0700
Subject: [PATCH 24/24] x86, build: allow LTO_CLANG and THINLTO to be selected
Allow CONFIG_LTO_CLANG and CONFIG_THINLTO to be enabled.
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
---
arch/x86/Kconfig | 2 ++
arch/x86/Makefile | 5 +++++
2 files changed, 7 insertions(+)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 4a64395bc35d..16f046d5abea 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -92,6 +92,8 @@ config X86
select ARCH_SUPPORTS_ACPI
select ARCH_SUPPORTS_ATOMIC_RMW
select ARCH_SUPPORTS_NUMA_BALANCING if X86_64
+ select ARCH_SUPPORTS_LTO_CLANG if X86_64
+ select ARCH_SUPPORTS_THINLTO if X86_64
select ARCH_USE_BUILTIN_BSWAP
select ARCH_USE_QUEUED_RWLOCKS
select ARCH_USE_QUEUED_SPINLOCKS
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 00e378de8bc0..a1abc1e081ad 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -188,6 +188,11 @@ ifdef CONFIG_X86_64
KBUILD_LDFLAGS += $(call ld-option, -z max-page-size=0x200000)
endif
+ifdef CONFIG_LTO_CLANG
+KBUILD_LDFLAGS += -plugin-opt=-code-model=kernel \
+ -plugin-opt=-stack-alignment=$(if $(CONFIG_X86_32),4,8)
+endif
+
# Workaround for a gcc prelease that unfortunately was shipped in a suse release
KBUILD_CFLAGS += -Wno-sign-compare
#
--
2.28.0
|