Commit aadfde87 authored Feb 13, 2018 by Sami Tolvanen

xen/efi: don't use -fshort-wchar



Specifying -fshort-wchar for just one object breaks LTO with the
following error message:

 ld.gold: fatal error: Failed to link module drivers/xen/efi.o:
 linking module flags 'wchar_size': IDs have conflicting values

Since efi.c doesn't actually use wchar_t, turn off the flag when
LTO is enabled.

Bug: 62093296
Bug: 67506682
Change-Id: I509c18677353add8e1ad04f99f6e42bdab7814e7
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>

parent f437c20f

drivers/xen/Makefile

+2 −0

Original line number	Diff line number	Diff line
		@@ -7,8 +7,10 @@ obj-y += xenbus/
		nostackp := $(call cc-option, -fno-stack-protector)
		CFLAGS_features.o := $(nostackp)

		ifndef CONFIG_LTO_CLANG
		CFLAGS_efi.o += -fshort-wchar
		LDFLAGS += $(call ld-option, --no-wchar-size-warning)
		endif

		dom0-$(CONFIG_ARM64) += arm-device.o
		dom0-$(CONFIG_PCI) += pci.o