This is the mail archive of the ecos-discuss@sources.redhat.com mailing list for the eCos project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]

Re: Stand-alone program


On Fri, Oct 26, 2001 at 09:08:28AM -0400, Hugo Villeneuve wrote:

> 	I have successfully installed ecos and all the binutils, gcc and 
> gdb stuff for the arm-elf target. How strange it may sounds, I just 
> want to know how I can compile a simple application, not using any 
> built-in libraries of gcc. I mean, I want to create my own crt.s (C 
> runtime startup) assembly file, and then call my main function from 
> this crt.s file.
> 
> 	My crt.s assembly file assembles great with arm-elf-as, but I 
> have a small error when compiling my main.c file (the main function of 
> which do nothing but return a success exit code):
> 
> command used:
> 	arm-elf-gcc -c -Wa,-marm7tdmi,-mapcs-32 main.c -o main.o
> output:
> 	main.o: In function `main':
> 	main.o(.text+0xc): undefined reference to `__gccmain'

Add a __gccmain to your startup file.  It doesn't need to do
anything, just return. Mine looks like this:

        .global __gccmain
__gccmain:
        mov     pc,lr   
        

-- 
Grant Edwards
grante@visi.com


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]