Re: [avr-gcc-list] Link Eorror in Combining C and assembly source files

[Joerg Wunsch]

Shilin Yu <address@hidden> wrote:

>    the assembly  file like this:
>          .extern    sched_mode

..extern is almost a no-op in GNU assembler.  It declares a symbol
"undefined external".  However, whenever the assembler encounters an
unknown (yet) symbol, it automatically classifies it "undefined
external", so in effect, .extern is almost only a comment to the
reader of the program to declare the intentions of the developer.

What you want is called .global; it declares a symbol as being
publically available to the linker.  By default, a symbol is local to
the current module only, and not exported to the linker.

-- 
cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL

http://www.sax.de/~joerg/                        NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)