@@ -25,6 +25,8 @@ config UML
select GENERIC_IRQ_SHOW
select GENERIC_CPU_DEVICES
select HAVE_GCC_PLUGINS
+ select ARCH_SUPPORTS_LTO_CLANG
+ select ARCH_SUPPORTS_LTO_CLANG_THIN
select TRACE_IRQFLAGS_SUPPORT
select TTY # Needed for line.c
select HAVE_ARCH_VMAP_STACK
@@ -142,7 +142,7 @@ endif
LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS),-Wl,$(opt))
# Used by link-vmlinux.sh which has special support for um link
-export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
+export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE) $(CC_FLAGS_LTO)
export LDFLAGS_vmlinux := $(LDFLAGS_EXECSTACK)
# When cleaning we don't include .config, so we don't include
@@ -61,7 +61,7 @@ CFLAGS_REMOVE_um_vdso.o = -pg -fprofile-arcs -ftest-coverage
#
quiet_cmd_vdso = VDSO $@
cmd_vdso = $(CC) -nostdlib -o $@ \
- $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
+ $(CC_FLAGS_LTO) $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
-Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \
sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@'
Only a handful of changes are necessary to get it to work. Signed-off-by: Peter Foley <pefoley2@pefoley.com> --- arch/um/Kconfig | 2 ++ arch/um/Makefile | 2 +- arch/x86/um/vdso/Makefile | 2 +- 3 files changed, 4 insertions(+), 2 deletions(-) --- base-commit: d9fc1511728c15df49ff18e49a494d00f78b7cd4 change-id: 20230113-umlto-c7f6731306e7 Best regards,