Full PIC mode isn't needed for Xen, namely is there no need to access data
objects via the GOT or call functions through the PLT. Adding
-fvisibility=hidden (if the compiler supports it) helps, although it doesn't do
as good a job as would be desired (I'm in talks with our compiler guys to
understand why).
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
Index: 2006-09-11/xen/arch/x86/Rules.mk
===================================================================
--- 2006-09-11.orig/xen/arch/x86/Rules.mk 2006-08-21 18:02:23.000000000
+0200
+++ 2006-09-11/xen/arch/x86/Rules.mk 2006-09-12 17:32:14.000000000 +0200
@@ -11,6 +11,23 @@ HAS_VGA := y
pae ?= n
supervisor_mode_kernel ?= n
+# Test for at least GCC v3.2.x.
+gcc-ver = $(shell $(CC) -dumpversion | sed -e 's/^\(.\)\.\(.\)\.\(.\)/\$(1)/')
+ifeq ($(call gcc-ver,1),1)
+$(error gcc-1.x.x unsupported - upgrade to at least gcc-3.2.x)
+endif
+ifeq ($(call gcc-ver,1),2)
+$(error gcc-2.x.x unsupported - upgrade to at least gcc-3.2.x)
+endif
+ifeq ($(call gcc-ver,1),3)
+ifeq ($(call gcc-ver,2),0)
+$(error gcc-3.0.x unsupported - upgrade to at least gcc-3.2.x)
+endif
+ifeq ($(call gcc-ver,2),1)
+$(error gcc-3.1.x unsupported - upgrade to at least gcc-3.2.x)
+endif
+endif
+
CFLAGS += -nostdinc -fno-builtin -fno-common -fno-strict-aliasing
CFLAGS += -iwithprefix include -Werror -Wno-pointer-arith -pipe
CFLAGS += -I$(BASEDIR)/include
@@ -41,6 +58,9 @@ endif
ifeq ($(TARGET_SUBARCH),x86_64)
CFLAGS += -mno-red-zone -fpic -fno-reorder-blocks
+ifneq ($(call gcc-ver,1),3)
+CFLAGS += -fvisibility=hidden
+endif
CFLAGS += -fno-asynchronous-unwind-tables
LDFLAGS += -m elf_x86_64
x86_32 := n
@@ -50,20 +70,3 @@ endif
HDRS += $(wildcard $(BASEDIR)/include/asm-x86/hvm/*.h)
HDRS += $(wildcard $(BASEDIR)/include/asm-x86/hvm/svm/*.h)
HDRS += $(wildcard $(BASEDIR)/include/asm-x86/hvm/vmx/*.h)
-
-# Test for at least GCC v3.2.x.
-gcc-ver = $(shell $(CC) -dumpversion | sed -e 's/^\(.\)\.\(.\)\.\(.\)/\$(1)/')
-ifeq ($(call gcc-ver,1),1)
-$(error gcc-1.x.x unsupported - upgrade to at least gcc-3.2.x)
-endif
-ifeq ($(call gcc-ver,1),2)
-$(error gcc-2.x.x unsupported - upgrade to at least gcc-3.2.x)
-endif
-ifeq ($(call gcc-ver,1),3)
-ifeq ($(call gcc-ver,2),0)
-$(error gcc-3.0.x unsupported - upgrade to at least gcc-3.2.x)
-endif
-ifeq ($(call gcc-ver,2),1)
-$(error gcc-3.1.x unsupported - upgrade to at least gcc-3.2.x)
-endif
-endif
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
Home