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linux-yocto/scripts/mod/Makefile
Sami Tolvanen d23dddf86a scripts/mod: disable LTO for empty.c 
With CONFIG_LTO_CLANG, clang generates LLVM IR instead of ELF object
files. As empty.o is used for probing target properties, disable LTO
for it to produce an object file instead.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20201211184633.3213045-12-samitolvanen@google.com
2021-01-14 08:21:09 -08:00

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SPDX-License-Identifier: GPL-2.0

OBJECT_FILES_NON_STANDARD := y CFLAGS_REMOVE_empty.o += $(CC_FLAGS_LTO)

hostprogs-always-y += modpost mk_elfconfig always-y += empty.o

modpost-objs := modpost.o file2alias.o sumversion.o

devicetable-offsets-file := devicetable-offsets.h

$(obj)/$(devicetable-offsets-file): $(obj)/devicetable-offsets.s FORCE $(call filechk,offsets,DEVICETABLE_OFFSETS_H)

targets += $(devicetable-offsets-file) devicetable-offsets.s

dependencies on generated files need to be listed explicitly

$(obj)/modpost.o $(obj)/file2alias.o $(obj)/sumversion.o: $(obj)/elfconfig.h $(obj)/file2alias.o: $(obj)/$(devicetable-offsets-file)

quiet_cmd_elfconfig = MKELF $@ cmd_elfconfig = $(obj)/mk_elfconfig < $< > $@

$(obj)/elfconfig.h: $(obj)/empty.o $(obj)/mk_elfconfig FORCE $(call if_changed,elfconfig)

targets += elfconfig.h