Xen and tools now require gcc 3.4+ on x86.

 - gcc-3.2 cannot handle some multi-line assertions in the Xen
 sources. Noone noticed.
 - gcc-3.3 has problems with alignment constraints inside typedefs.

gcc 3.4.0 is now three years old so I hope that everyone has an
up-to-date compiler, or can obtain a more up-to-date package for their
distribution. If not we may need to fall back to supporting gcc-3.3.x
as well.

Also clean up the way we do version checks, using the power of awk.

Signed-off-by: Keir Fraser <keir@xensource.com>

1 files changed, 3 insertions, 15 deletions

diff --git a/xen/arch/x86/Rules.mk b/xen/arch/x86/Rules.mk
index 899f28129c..86b9f33ab1 100644
--- a/xen/arch/x86/Rules.mk
+++ b/xen/arch/x86/Rules.mk
@@ -58,19 +58,7 @@ 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)
-$(error gcc-3.1.x unsupported - upgrade to at least gcc-3.2.x)
-endif
+# Require GCC v3.4+ (to avoid issues with alignment constraints in Xen headers)
+ifneq ($(call cc-ver,$(CC),0x030400),y)
+$(error Xen requires at least gcc-3.4)
 endif