3:14 a.m.
(2012/04/17 23:44), Dave Anderson wrote:
----- 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
Hi Dave,
I didn't explain about background issues.
I built a PPC binary on an x86 host cross compiler. When run it,
I have to ftp to PPC machine where dose not have self build tools.
Here is dumping my build environment info.
$ uname -m
x86_64
$ file gcc
gcc: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV),
dynamically linked (uses shared libs), for GNU/Linux 2.2.5, stripped
$ ./gcc -dumpmachine
powerpc-linux-gnu
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",
}
};
This "target=PPC" on a PPC64 host has been already supported
since I copied it into ppc[] table.
[Crash-utility] [PATCH v1 1/4] Support PPC32 Core analysis on PPC64 Host
https://www.redhat.com/archives/crash-utility/2011-November/msg00019.html
The purpose is to build ppc 32bit binary with compatible target CFLAGS "-m32"
of ppc64 compiler. This is similar idea with x86_64.
But I added new cross support(is_cross is TRUE) in patch#5 which is
distinct from original purpose.
+ {
+ .host = X86,
+ .cflags = "-D_FILE_OFFSET_BITS=64",
+ .gdb_conf_flags = "--host=i686-pc-linux-gnu "
+ "--target=powerpc-elf-linux",
+ .is_cross = TRUE,
+ },
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.
My issues are to arrange original crash package as compilable one with cross.
I edit package's Makefile or configure parameters --host/--target at spec file,
finally building with environment variables CC, AR, LD, etc.
By applying patches, I can build crash only with tiny spec update,
"make target=PPC host_cross=X86" without modification of released archive.
Then, I'll start mips architecture (seems to go toward embedded minority).
There are probably the similar considerations about cross compile.
I want to be done with "make target=MIPS host_cross=X86" by adding mips tables.
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
I haven't caught this update. I'd send updated portion.
Thanks,
Toshi
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(-)
>
>
>
>
>
>
>
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