avoid rebuilding dependent files if the generated busy.h and ringtone.h

do not change.

Ths masks (but does not solve) a but that i am seeing in doing a
'gmake install' without donig a 'gmake all' first.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@94713 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/Makefile b/channels/Makefile
index 50df82c..757f209 100644 (file)
--- a/channels/Makefile
+++ b/channels/Makefile
@@ -89,10 +89,16 @@ gentone: gentone.c
        $(CMD_PREFIX) $(HOST_CC) -o $@ $^ -lm
 
 busy.h: gentone
+       -@mv $@ $@.tmp
        ./gentone busy 480 620
+       @cmp -s $@.tmp $@ && mv $@.tmp $@
+       -@rm -f  $@.tmp
 
 ringtone.h: gentone
+       -@mv $@ $@.tmp
        ./gentone ringtone 440 480
+       @cmp -s $@.tmp $@ && mv $@.tmp $@
+       -@rm -f  $@.tmp
 
 $(if $(filter chan_iax2,$(EMBEDDED_MODS)),modules.link,chan_iax2.so): iax2-parser.o iax2-provision.o