[LiSA-Users] Cross compiling

[Kerry Brown]

It didnt work out of the box because when doing Make CC=arm-linux-gcc

the linker would always fail because it would call ld rather then then 
arm-linux-ld..or the full path....

Im running it manually per your suggestion, we will see what happens...

This however did compile just fine on a mips system for me. so ...weird


Ionut Nicu wrote:
> On Thu, 2007-01-11 at 02:54 -0700, Kerry Brown wrote:
>   
>> I actually just had to play with the Make file to get it to compile For 
>> Big endian Arm....
>>
>>
>> Here is the error I get when i try to link swctl
>>
>> arm-linux-ld -EB -o swctl swctl.o ../lib/misc.o
>> arm-linux-ld: warning: cannot find entry symbol _start; defaulting to 
>> 00008074
>> swctl.o(.text+0x1c): In function `parse_hw_addr':
>> : undefined reference to `calloc'
>>     
>
> Hi Kerry,
>
> I'm not sure what changes have you made to the Makefiles, however it
> seems like you're not linking against libc (i.e. the linker doesn't get
> called with the appropriate flags and libraries).
> To form an executable out of swctl.o and misc.o, the linker needs to
> resolve some symbols such as _start and calloc (obviously, these are
> from libc and are not defined in our object files).
> The correct way to make an executable out of these object files is to
> call 'gcc -o swctl swctl.o ../lib/misc.o'. This way gcc knows how to
> pass the correct arguments to the linker.
> Try running 'gcc -v -o swctl swctl.o ../lib/misc.o' to get an insight on
> the parameters that gcc passes to the linker. For instance, on my x86
> machine the interesting output is:
>
> gcc -v -o swctl swctl.o ../lib/misc.o
>
>  /usr/libexec/gcc/i686-pc-linux-gnu/3.4.6/collect2 --eh-frame-hdr -m
> elf_i386 -dynamic-linker /lib/ld-linux.so.2 -o
> swctl /usr/lib/gcc/i686-pc-linux-gnu/3.4.6/../../../crt1.o /usr/lib/gcc/i686-pc-linux-gnu/3.4.6/../../../crti.o /usr/lib/gcc/i686-pc-linux-gnu/3.4.6/crtbegin.o -L/usr/lib/gcc/i686-pc-linux-gnu/3.4.6 -L/usr/lib/gcc/i686-pc-linux-gnu/3.4.6 -L/usr/lib/gcc/i686-pc-linux-gnu/3.4.6/../../../../i686-pc-linux-gnu/lib -L/usr/lib/gcc/i686-pc-linux-gnu/3.4.6/../../.. swctl.o ../lib/misc.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/i686-pc-linux-gnu/3.4.6/crtend.o /usr/lib/gcc/i686-pc-linux-gnu/3.4.6/../../../crtn.o
>
> You can see here that swctl is linked also from ld-linux.so.2 crti.o and
> crtn.o.
>
> I'm not sure why 'make' didn't work right out of the box for you (the
> rule that makes swctl is correct: $(CC) $(LDFLAGS) -o swctl
> $^ ../lib/misc.o). Here $(CC) must be resolved to your cross compiler
> (arm gcc). If that's the problem, try setting CC to your cross compiler
> and make should work just fine.
>
> Ionut.
>
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