x86/boot: fix build with certain older gcc versions

Despite all attempts so far (ending in commit fecf584294 ["Config.mk:
fix comment for debug option"] adjusting the respective comment),
Config.mk's debug= setting still affects the hypervisor build: CFLAGS
gets -g added there.

xen/arch/x86/boot/build32.mk includes that file, and hence inherits the
setting too. Some gcc versions take -g to create an .eh_frame section
despite -fno-asynchronous-unwind-tables (which instead one would expect
to produce .debug_frame).

In turn, commit 93c0c0287a ("x86/boot: create *.lnk files with linker
script") was - in my understanding - supposed to make sure .text is
first, but apparently it did also not really achieve that effect: Both
reloc.lnk and reloc.bin in the case here ended up with .eh_frame first,
which obviously rendered the whole final binary unusable.

Explicitly suppress generation of any kind of debug info when building
reloc.o.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
master commit: 620b3c7eee78e90167f591877177c922ae619b92
master date: 2016-12-16 14:37:35 +0100

diff --git a/xen/arch/x86/boot/build32.mk b/xen/arch/x86/boot/build32.mk
index 39e6453ccb2f0c024f41a0785302d5b93a3dd1de..272d942a1bb973361f6faa6e9f8b946be0ffbf46 100644 (file)
--- a/xen/arch/x86/boot/build32.mk
+++ b/xen/arch/x86/boot/build32.mk
@@ -4,7 +4,7 @@ include $(XEN_ROOT)/Config.mk
 
 $(call cc-options-add,CFLAGS,CC,$(EMBEDDED_EXTRA_CFLAGS))
 
-CFLAGS += -Werror -fno-asynchronous-unwind-tables -fno-builtin -msoft-float
+CFLAGS += -Werror -fno-asynchronous-unwind-tables -fno-builtin -g0 -msoft-float
 CFLAGS := $(filter-out -flto,$(CFLAGS)) 
 
 # NB. awk invocation is a portable alternative to 'head -n -1'