tools/tests/x86_emulator: Pass -no-pie -fno-pic to gcc on x86_32

The current build fails with GCC6 on Debian sid i386 (unstable):

 /tmp/ccqjaueF.s: Assembler messages:
 /tmp/ccqjaueF.s:3713: Error: missing or invalid displacement expression `vmovd_to_reg_len@GOT'

This is due to the combination of GCC6, and Debian's decision to
enable some hardening flags by default (to try to make runtime
addresses less predictable):
  https://wiki.debian.org/Hardening/PIEByDefaultTransition

This is of no benefit for the x86 instruction emulator test, which is
a rebuild of the emulator code for testing purposes only.  So pass
options to disable this.

These options will be no-ops if they are the same as the compiler
default.

On amd64, the -fno-pic breaks the build in a different way.  So do
this only on i386.

Signed-off-by: Ian Jackson <ian.jackson@citrix.com>
CC: Jan Beulich <jbeulich@suse.com>
CC: Andrew Cooper <andrew.cooper3@citrix.com>
Gbp-Pq: Topic misc
Gbp-Pq: Name toolstestsx86_emulator-pass--no-pie--fno.patch

diff --git a/tools/tests/x86_emulator/Makefile b/tools/tests/x86_emulator/Makefile
index 48b3e6dce12e2957b7f83dd1da38d4a31382e686..83bc757bb47a758a60e7baafc1868158f8844986 100644 (file)
--- a/tools/tests/x86_emulator/Makefile
+++ b/tools/tests/x86_emulator/Makefile
@@ -283,6 +283,10 @@ HOSTCFLAGS-x86_64 := -fno-PIE
 $(call cc-option-add,HOSTCFLAGS-x86_64,HOSTCC,-no-pie)
 HOSTCFLAGS += $(CFLAGS_xeninclude) -I. $(HOSTCFLAGS-$(XEN_COMPILE_ARCH))
 
+ifeq ($(XEN_TARGET_ARCH),x86_32)
+HOSTCFLAGS += -no-pie -fno-pic
+endif
+
 x86.h := $(addprefix $(XEN_ROOT)/tools/include/xen/asm/,\
                      x86-vendors.h x86-defns.h msr-index.h) \
          $(addprefix $(XEN_ROOT)/tools/include/xen/lib/x86/, \