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>
squash! tools/tests/x86_emulator: Pass -no-pie -fno-pic to gcc

Signed-off-by: Ian Jackson <ian.jackson@citrix.com>
Gbp-Pq: Name 0028-tools-tests-x86_emulator-Pass-no-pie-fno-pic-to-gcc-.patch

diff --git a/tools/tests/x86_emulator/Makefile b/tools/tests/x86_emulator/Makefile
index 13ace9a10593cf837db1fef6a197c9977f063e2c..d349c0fdb64735fa2b3f5327195f05ef78d927ab 100644 (file)
--- a/tools/tests/x86_emulator/Makefile
+++ b/tools/tests/x86_emulator/Makefile
@@ -45,6 +45,10 @@ x86_emulate/x86_emulate.c x86_emulate/x86_emulate.h:
 
 HOSTCFLAGS += $(CFLAGS_xeninclude)
 
+ifeq ($(XEN_TARGET_ARCH),x86_32)
+HOSTCFLAGS += -no-pie -fno-pic
+endif
+
 x86_emulate.o: x86_emulate.c x86_emulate/x86_emulate.c x86_emulate/x86_emulate.h
        $(HOSTCC) $(HOSTCFLAGS) -c -g -o $@ $<