Thread (36 messages) 36 messages, 4 authors, 2020-10-12
STALE2068d REVIEWED: 1 (0M)
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[PATCH v5 20/29] efi/libstub: disable LTO

From: Sami Tolvanen <samitolvanen@google.com>
Date: 2020-10-09 16:15:04
Also in: linux-arch, linux-kbuild, linux-pci, lkml
Subsystem: extensible firmware interface (efi), the rest · Maintainers: Ard Biesheuvel, Linus Torvalds

With CONFIG_LTO_CLANG, we produce LLVM bitcode instead of ELF object
files. Since LTO is not really needed here and the Makefile assumes we
produce an object file, disable LTO for libstub.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <redacted>
---
 drivers/firmware/efi/libstub/Makefile | 2 ++
 1 file changed, 2 insertions(+)
diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
index 0c911e391d75..e927876f3a05 100644
--- a/drivers/firmware/efi/libstub/Makefile
+++ b/drivers/firmware/efi/libstub/Makefile
@@ -36,6 +36,8 @@ KBUILD_CFLAGS			:= $(cflags-y) -Os -DDISABLE_BRANCH_PROFILING \
 
 # remove SCS flags from all objects in this directory
 KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_SCS), $(KBUILD_CFLAGS))
+# disable LTO
+KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_LTO), $(KBUILD_CFLAGS))
 
 GCOV_PROFILE			:= n
 # Sanitizer runtimes are unavailable and cannot be linked here.
-- 
2.28.0.1011.ga647a8990f-goog


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