[Xen-devel] [RFC PATCH 7/8] Config.mk: introduce cc-ifversion

[Wei Liu <wei.liu2@xxxxxxxxxx>]

It returns different string depending on compiler version.

No user yet.

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 Config.mk | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Config.mk b/Config.mk
index a97036e..d5834cd 100644
--- a/Config.mk
+++ b/Config.mk
@@ -128,6 +128,11 @@ define cc-ver-check-closure
     endif
 endef
 
+# cc-ifversion: Check compiler version and take branch accordingly
+# Usage $(call cc-ifversion, -lt, 0x040700, string_if_y, string_if_n)
+cc-ifversion = $(shell [ $(call cc-ver,$(CC),$(1),$(2)) = "y" ] \
+                               && echo $(3) || echo $(4))
+
 # Require GCC v4.1+
 check-$(gcc) = $(call cc-ver-check,CC,0x040100,"Xen requires at least gcc-4.1")
 $(eval $(check-y))
-- 
2.1.4


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