bitkeeper revision 1.1159.170.21 (41978006yk1bg04SJNSN2JWccT5adA)

Disable PIE/SSP features when building Xen, if GCC supports them.

xen/Rules.mk

@@ -39,6 +39,8 @@ ALL_OBJS += $(BASEDIR)/arch/$(TARGET_ARCH)/arch.o
 HOSTCC     = gcc
 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer 
 
+test-gcc-flag = $(shell gcc -v --help 2>&1 | grep -q " $(1) " && echo $(1))
+
 include $(BASEDIR)/arch/$(TARGET_ARCH)/Rules.mk
 
 ifneq ($(debug),y)
@@ -62,6 +64,8 @@ ifeq ($(trace),y)
 CFLAGS += -DTRACE_BUFFER
 endif
 
+CFLAGS := $(strip $(CFLAGS))
+
 %.o: %.c $(HDRS) Makefile
 	$(CC) $(CFLAGS) -c $< -o $@
 

xen/arch/x86/Rules.mk

@@ -14,10 +14,14 @@ else
 x86_32/usercopy.o: CFLAGS += -O1
 endif
 
-
 # Prevent floating-point variables from creeping into Xen.
 CFLAGS  += -msoft-float
 
+# Disable PIE/SSP if GCC supports them. They can break us.
+CFLAGS  += $(call test-gcc-flag,-nopie)
+CFLAGS  += $(call test-gcc-flag,-fno-stack-protector)
+CFLAGS  += $(call test-gcc-flag,-fno-stack-protector-all)
+
 ifeq ($(TARGET_SUBARCH),x86_32)
 CFLAGS  += -m32 -march=i686
 LDFLAGS := --oformat elf32-i386