gentoo-overlay/app-emulation/xen/files/xen-4.16-efi.patch

diff -urN a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
--- a/xen/arch/x86/Makefile	2021-11-30 06:42:42.000000000 -0500
+++ b/xen/arch/x86/Makefile	2022-02-17 07:43:06.597244620 -0500
@@ -127,7 +127,7 @@
 CFLAGS-$(XEN_BUILD_EFI) += -DXEN_BUILD_EFI
 
 # Check if the linker supports PE.
-EFI_LDFLAGS = $(patsubst -m%,-mi386pep,$(XEN_LDFLAGS)) --subsystem=10
+EFI_LDFLAGS = -mi386pep $(patsubst -m%,-mi386pep,$(XEN_LDFLAGS)) --subsystem=10
 XEN_BUILD_PE := $(if $(XEN_BUILD_EFI),$(call ld-option,$(EFI_LDFLAGS) --image-base=0x100000000 -o efi/check.efi efi/check.o))
 # If the above failed, it may be merely because of the linker not dealing well
 # with debug info. Try again with stripping it.