Re: [Sdcc-user] Problem with SDCC

[Bernhard H. <ber...@be...>]

> I use the following SDCC version
> SDCC : mcs51/gbz80/z80/avr/ds390/pic14 2.3.0 (Sep 20 2001) (UNIX)
> with Win32 and these command line options:
> sdcc -I..\share\sdcc\include --code-loc 0x8000 <file.c>
> (from the directory sdcc\bin)
>
> When running SDCC even with a very simple program containing only an
> endless loop, I get the following warning:
>
> ?ASlink-Warning-Undefined Global '__sdcc_external_startup' referenced by
> module'a01'

Show sdcc the path to the libraries. sdcclib.lib contains the file _startup, 
which in turn contains the symbol (or function) _sdcc_external_startup. You 
can pass the necessary parameter to sdcc with:
-L..\share\sdcc\lib\small

> In the help files it is said that this __sdcc_external_startup function is
> invoked by the runtime library and it can be overwritten. I tried this,
> too, but without success. In the runtime library I found this function
> together with some initializations. These initializations seem to be mapped
> into the _main function in the generated assembler file, but without the
> label, which is called, but not defined, elsewhere in the asm file.

Simply copy the contents of _startup.c into your source-file, and the linker 
will be happy too. Please note, that the compiler adds an underscore to each 
symbol, which is declared in the C-source: main -> _main,
_sdcc_external_startup -> __sdcc_external_startup.

> Thank you very much, merry Christmas!
Merry Christmas!

Bernhard