[Crash-utility] [PATCH 0/5] let make flexible for multiple host

[Dave Anderson]

----- Original Message -----
> Hi Dave,
> 
> This patch set will make configure or build flexible for host environment,
> in particular dealing with cross compiler. 
> Please consider about this proposal.
> 
> patch#1:
>  By declaring tables about target and host relationships,
>  cleanup corresponding code and the new build combination will be
>  adapted briefly.
> 
> Remaining patches:
>  Try to relieve cross compiler burden by using explicit host_cross option.
>  I'm using cross compiler environ host=x86 for target=ppc,
>  and might attempt target=<another arch> in the near future.
>  I stocked private patches to accomplish cross compiling
>  but I'd like to discard them permanently with your agreement.
> 
> Thanks,
> Toshi

I am presuming that you have successfully built a PPC binary on an
x86 or x86_64 host, and then you have copied the binary to a PPC host
that doesn't have a resident compiler?  But then again, looking at your
patch as is, it looks like you can only allow "target=PPC" on a PPC64 host,
which is already supported?:

   static struct host_table {

   ... [ cut ] ...

   }, ppc[] = {
           {
                   .host = PPC64,
                   .cflags = "-m32 -D_FILE_OFFSET_BITS=64 -fPIC",
                   .gdb_conf_flags = "--target=ppc-elf-linux CFLAGS=-m32",
           }
   };

In any case, I would prefer that you specifically address your
particular PPC-on-X86 build issue, because I'm not sure what
other combinations would be particularly useful.  

I'm not particularly interested in speculative changes.  The only
future architecture support I can see on the horizon is 64-bit ARM,
and that is a few a few years away.  And we are lucky that x86 and
ARM have the same endianness and data-type sizes, so we can continue
(hopefully) to build x86_64 binaries to analyze 64-bit ARM vmcores
on x86_64 hosts.  

Also, note that your patch fails because it collides with Rabin's queued
fix for building SIAL for target=ARM and target=PPC builds:

 [Crash-utility] [PATCH] build sial with TARGET_CFLAGS
 https://www.redhat.com/archives/crash-utility/2012-March/msg00113.html  

Dave


  

> 
> Toshikazu Nakayama (5):
>   configure: retake the way of host compiler detection
>   Makefile: wrap cc, gcc and ar with common make valiables
>   make: add host_cross option
>   build_data: handle CC valiable
>   configure: handle cross compile with target=ppc host_cross=x86
> 
>  Makefile            |  144 +++++++++--------
>  configure.c         |  441
>  ++++++++++++++++++++++-----------------------------
>  extensions/Makefile |   10 +-
>  extensions/sial.mk  |    6 +-
>  extensions/snap.mk  |    6 +-
>  5 files changed, 289 insertions(+), 318 deletions(-)
> 
> 
> 
> 
> 
> 
> 
> --
> Crash-utility mailing list
> Crash-utility at redhat.com
> https://www.redhat.com/mailman/listinfo/crash-utility
>