From 076d247142c1ff1e4d618557fc0acc62f6eb2a7c Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Mon, 21 Dec 2009 10:06:55 +0100
Subject: Use vpath directive

The vpath directive has two advantages over the VPATH variable:
1) it allows to skip searching of .o files; 2) the default semantics
are to append to the vpath, so there is no confusion between "VPATH=xyz"
and "VPATH+=xyz".

Since "vpath %.c %.h PATH" is not valid, I'm introducing a wrapper
macro to append one or more directories to the vpath.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
 rules.mak | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'rules.mak')

diff --git a/rules.mak b/rules.mak
index 9bcf9af95f..094dc0924d 100644
--- a/rules.mak
+++ b/rules.mak
@@ -39,6 +39,8 @@ quiet-command = $(if $(V),$1,$(if $(2),@echo $2 && $1, @$1))
 cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc /dev/null \
               >/dev/null 2>&1 && echo OK), $2, $3)
 
+set-vpath = $(if $1,$(foreach PATTERN,%.c %.h %.S, $(eval vpath $(PATTERN) $1)))
+
 # Generate timestamp files for .h include files
 
 %.h: %.h-timestamp
-- 
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