linux-kernel - [PATCH 34/46] scripts, lto: disable gcc LTO for some mod sources

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Date:   Mon, 14 Nov 2022 12:43:32 +0100
From:   "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Andi Kleen <andi@...stfloor.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kbuild@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
        Martin Liska <mliska@...e.cz>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 34/46] scripts, lto: disable gcc LTO for some mod sources

From: Andi Kleen <andi@...stfloor.org>

The mod tools scan assembler (devicetable-offsets.s) to generate symbols
into devicetable-offsets.h and binary (empty.o) to find out ELF setup.
That doesn't work with LTO. So just disable LTO for empty.o and
devicetable-offsets.s.

Cc: Masahiro Yamada <masahiroy@...nel.org>
Cc: Michal Marek <michal.lkml@...kovi.net>
Cc: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: linux-kbuild@...r.kernel.org
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Martin Liska <mliska@...e.cz>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 scripts/mod/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/scripts/mod/Makefile b/scripts/mod/Makefile
index c9e38ad937fd..aa3465d6bc4a 100644
--- a/scripts/mod/Makefile
+++ b/scripts/mod/Makefile
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 OBJECT_FILES_NON_STANDARD := y
 CFLAGS_REMOVE_empty.o += $(CC_FLAGS_LTO)
+CFLAGS_REMOVE_empty.o += $(CC_FLAGS_LTO_GCC)
 
 hostprogs-always-y	+= modpost mk_elfconfig
 always-y		+= empty.o
@@ -9,6 +10,8 @@ modpost-objs	:= modpost.o file2alias.o sumversion.o
 
 devicetable-offsets-file := devicetable-offsets.h
 
+$(obj)/devicetable-offsets.s: KBUILD_CFLAGS += $(DISABLE_LTO_GCC)
+
 $(obj)/$(devicetable-offsets-file): $(obj)/devicetable-offsets.s FORCE
 	$(call filechk,offsets,__DEVICETABLE_OFFSETS_H__)
 
-- 
2.38.1