Commit 83e913f5 authored by Peter Foley's avatar Peter Foley Committed by Richard Weinberger
Browse files

um: Support LTO 



Only a handful of changes are necessary to get it to work.

Signed-off-by: default avatarPeter Foley <pefoley2@pefoley.com>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent f09c3fcf

arch/um/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -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

arch/um/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -144,7 +144,7 @@ endif 
LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS) $(LDFLAGS_EXECSTACK),-Wl,$(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)



# When cleaning we don't include .config, so we don't include

# TT or skas makefiles and don't clean skas_ptregs.h.

arch/x86/um/vdso/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -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 '$(NM)' '$@'