From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jerry Van Baren <gerald.vanbaren@smiths-aerospace.com>
Date: Thu, 18 Aug 2005 14:31:25 -0400
Subject: [U-Boot-Users] Re: MIPS LE build problems
In-Reply-To: <1124354577.13487.4.camel@localhost.localdomain>
References: <20050817080842.36E19353CFF@atlas.denx.de> <1124354577.13487.4.camel@localhost.localdomain>
Message-ID: <4304D3FD.7080107@smiths-aerospace.com>
List-Id: <u-boot.lists.denx.de>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: u-boot@lists.denx.de

Matej Kupljen wrote:
> Hi
> 
> 
>>So is there a clever way to "ask" gcc which endianess it's using? 
>>I tried to come up with one but failed so far...
> 
> 
> I am searching how to do that.
> How about if the config.mk runs a little test program, like
> configure does?
> 
> For example:
> 
> #include <stdio.h>
> #include <stdlib.h>
> int main(int argc, char **argv)
> {
> 	unsigned int data = 0x01234567;
> 	char *ptr = (char *)&data;
> 	if (ptr[0] == 0x01 && ptr[1] == 0x23 && ptr[2] == 0x45 && ptr[3] == 0x67)
> 		printf("big\n");
> 	else if (ptr[3] == 0x01 && ptr[2] == 0x23 && ptr[1] == 0x45 && ptr[0] == 0x67)
> 		printf("little\n");
> 	else
> 		printf("unknown\n");
> 	return 0;
> }
> 
> And then check the output of this program and decides to pass the -EL or -EB 
> to LDFLAGS.
> 
> Oh, do you know why I have to use the:
>  -Wa,-allow_branch_to_undefined
> instead of:
>  -Wa,-mips_allow_branch_to_undefined
> even though (I guess) I use the same patch as you do?
> 
> And why don't you accept the patch that eliminates this patch to
> binutils?
> 
> BR,
> Matej

As noted in other email in this thread, executing the above code won't 
work.  What about simply compiling a file containing:

constant int data = 0x01234567;

objdumping the data section, and looking (grepping) to see if the data 
section has 0x12345678 or 0x78563412?

Speculating ignorantly...
gvb