Re: Build TAGS problem with O=

[George Anzinger <george@mvista.com>]

George Anzinger wrote:
> If you try:
> make O=/usr/src/ver/2.6.13-rc/obj/ -j5 LOCALVERSION=_2.6.13-rc TAGS 
> ARCH=i386
> 
> it fails with:
>   MAKE   TAGS
> find: security/selinux/include: No such file or directory
> find: include: No such file or directory
> find: include/asm-i386: No such file or directory
> find: include/asm-generic: No such file or directory
> 
> 
> The problem seems to be this bit of the topdir Makefile:
> 
> 
> #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
> #(which is the most common case IMHO) to avoid unneeded clutter in the 
> big tags file.
> #Adding $(srctree) adds about 20M on i386 to the size of the output file!
> 
> ifeq ($(KBUILD_OUTPUT),)
> __srctree =
> else
> __srctree = $(srctree)/
> endif
> 
> It would appear that the "ifeq ($(KBUILD_OUTPUT),)" is doing the wrong 
> thing.  I am not a make expert, but I have had a lot of BAD experience 
> trying to use this construct.  Any one up to proposing a fix?
> 
The problem appears to be that KBUILD_OUTPUT is NOT defined after make reruns 
itself.  Here is a fix:

Signed-off-by:  George Anzinger  <george@mvista.com>

--- /usr/src/linux-2.6.12-org/Makefile	2005-07-01 14:37:44.000000000 -0700
+++ /usr/src/linux-2.6.13-rc/Makefile	2005-07-05 19:45:00.588314304 -0700
@@ -1149,7 +1149,7 @@
  #(which is the most common case IMHO) to avoid unneeded clutter in the big 
tags file.
  #Adding $(srctree) adds about 20M on i386 to the size of the output file!

-ifeq ($(KBUILD_OUTPUT),)
+ifeq ($(src),$(obj))
  __srctree =
  else
  __srctree = $(srctree)/



-- 
George Anzinger   george@mvista.com
HRT (High-res-timers):  http://sourceforge.net/projects/high-res-timers/