linux-kernel - [PATCH 36/46] lib/string, lto: disable gcc LTO for string.o

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Message-Id: <20221114114344.18650-37-jirislaby@kernel.org>
Date:   Mon, 14 Nov 2022 12:43:34 +0100
From:   "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Andi Kleen <andi@...stfloor.org>, Andi Kleen <ak@...ux.intel.com>,
        Martin Liska <mliska@...e.cz>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 36/46] lib/string, lto: disable gcc LTO for string.o

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

gcc can generate calls for string functions implicitly, and that assumes
they exist in a non-LTOed copy. Mark string.o as LTO disabled to avoid
missing symbols at link time.

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>
---
 lib/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/Makefile b/lib/Makefile
index 59bd7c2f793a..bf72b58de5c8 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -27,6 +27,8 @@ KASAN_SANITIZE_string.o := n
 CFLAGS_string.o += -fno-stack-protector
 endif
 
+CFLAGS_string.o += $(DISABLE_LTO_GCC)
+
 lib-y := ctype.o string.o vsprintf.o cmdline.o \
 	 rbtree.o radix-tree.o timerqueue.o xarray.o \
 	 maple_tree.o idr.o extable.o irq_regs.o argv_split.o \
-- 
2.38.1