newlib does not pick up the right cross-compiling gcc

[Ralf Corsepius]

On 02/05/2010 10:47 AM, Josef Wolf wrote:
> [ Sorry for not following up to the original thread, but I already deleted
>    before I noticed that I have the same problem ]
>
> Ralf Corsepius wrote:
>> This means you don't have powerpc-unknown-eabi-gcc installed rsp. don't have
>> it in $PATH.
>>
>> To build newlib separately from gcc (which is what you do) you need your
>> target's<target>-gcc in $PATH
>
> I have the gcc for the target (m68k-unknown-elf in my case) target installed
> and I give both, --target=m68k-unknown-elf and --host=m68k-unknown-elf
> options to configure, but still the native gcc is picked for compiling
> newlib.
>
> Even worse: if I explicitly specify the cross compiler with
>
>    CC=/path/to/cross/bin/m68k-unknown-gcc /path/to/src/configure<more_options>

A piece of advice: It's not a good idea to set "CC", "CFLAGS", 
"CXXFLAGS", "AS", "LIBS" etc. when starting to get into building newlib, 
gcc or gcc+newlib, because crossbuilding typically involves build-, 
host- and target- compilation.

I.e. these environment variable might not be doing what think they are 
doing - If you know what they are doing, then there is nothing wrong in 
setting then.

> then configure complains that the compiler can not create executables. Which
> is no surprise: the cross compiler is not meant to create executables for the
> build machine.
>
> I have posted this problem to this list a while ago, but nobody seems to have
> an idea what might cause the problem.

Well, your report was against newlib-1.15.0 -- An outdated and 
discontinued version, probably nobody wants to look back into :-)

Anyway, let me ask you a counter question: Why do you want to run 
"newlib/configure" ?

The standard way to build newlib is to run the toplevel
"configure --target=<target>" in a separate build directory or to build 
newlib one-tree style with gcc.


Ralf