[PATCH] x86/EFI: work around GNU ld 2.36 issue

[Jan Beulich <jbeulich@xxxxxxxx>]

Our linker capability check fails with the recent binutils release's ld:

.../check.o:(.debug_aranges+0x6): relocation truncated to fit: R_X86_64_32 
against `.debug_info'
.../check.o:(.debug_info+0x6): relocation truncated to fit: R_X86_64_32 against 
`.debug_abbrev'
.../check.o:(.debug_info+0xc): relocation truncated to fit: R_X86_64_32 against 
`.debug_str'+76
.../check.o:(.debug_info+0x11): relocation truncated to fit: R_X86_64_32 
against `.debug_str'+d
.../check.o:(.debug_info+0x15): relocation truncated to fit: R_X86_64_32 
against `.debug_str'+2b
.../check.o:(.debug_info+0x29): relocation truncated to fit: R_X86_64_32 
against `.debug_line'
.../check.o:(.debug_info+0x30): relocation truncated to fit: R_X86_64_32 
against `.debug_str'+19
.../check.o:(.debug_info+0x37): relocation truncated to fit: R_X86_64_32 
against `.debug_str'+71
.../check.o:(.debug_info+0x3e): relocation truncated to fit: R_X86_64_32 
against `.debug_str'
.../check.o:(.debug_info+0x45): relocation truncated to fit: R_X86_64_32 
against `.debug_str'+5e
.../check.o:(.debug_info+0x4c): additional relocation overflows omitted from 
the output

Tell the linker to strip debug info as a workaround. Oddly enough debug
info has been getting stripped when linking the actual xen.efi, without
me being able to tell why this would be.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -123,7 +123,7 @@ ifneq ($(efi-y),)
 # Check if the compiler supports the MS ABI.
 export XEN_BUILD_EFI := $(shell $(CC) $(XEN_CFLAGS) -c efi/check.c -o 
efi/check.o 2>/dev/null && echo y)
 # Check if the linker supports PE.
-XEN_BUILD_PE := $(if $(XEN_BUILD_EFI),$(shell $(LD) -mi386pep --subsystem=10 
-o efi/check.efi efi/check.o 2>/dev/null && echo y))
+XEN_BUILD_PE := $(if $(XEN_BUILD_EFI),$(shell $(LD) -mi386pep --subsystem=10 
-S -o efi/check.efi efi/check.o 2>/dev/null && echo y))
 CFLAGS-$(XEN_BUILD_EFI) += -DXEN_BUILD_EFI
 endif