Messages in this thread Patch in this message | | | From | Peter Foley <> | Date | Fri, 13 Jan 2023 12:03:00 -0500 | Subject | [PATCH] um: Support LTO |
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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(-)
diff --git a/arch/um/Kconfig b/arch/um/Kconfig index ad4ff3b0e91e..7c94ca7ff758 100644 --- a/arch/um/Kconfig +++ b/arch/um/Kconfig @@ -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 diff --git a/arch/um/Makefile b/arch/um/Makefile index f1d4d67157be..a41dde204b08 100644 --- a/arch/um/Makefile +++ b/arch/um/Makefile @@ -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 diff --git a/arch/x86/um/vdso/Makefile b/arch/x86/um/vdso/Makefile index 6fbe97c52c99..6825e146a62f 100644 --- a/arch/x86/um/vdso/Makefile +++ b/arch/x86/um/vdso/Makefile @@ -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 '$(NM)' '$@' --- base-commit: d9fc1511728c15df49ff18e49a494d00f78b7cd4 change-id: 20230113-umlto-c7f6731306e7 Best regards, -- Peter Foley <pefoley2@pefoley.com>
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