Re: [avr-gcc-list] Compiler linking error

[Nick Brent]

> On 27 Feb 2004 at 14:18, Nick Brent wrote:
>
> > Hey everyone. I checked the archives, but I didn't see an answer to this
exact
> > question. I'm using avr-gcc 3.3.1. What I'm trying to do is create a
static
> > library that I can distribute to others. When I use this command to
compile the
> > project:
> >
> >     avr-gcc -mmcu=atmega128 delay2.o lcdcntrl.o test2.c -o test2.ex
> >
> > It compiles just fine. The problem I run into is that when I compile a
project
> > with a static library using these commands:
> >
> >     avr-ar -r libtest2.a delay2.o lcdcntrl.o
> >     avr-gcc -mmcu=atmega128 libtest2.a test2.c -o test2.ex
> >
> > Then I get this error message:
> >
> >     C:\WINDOWS\TEMP/ccULbaaa.o(.text+0xce): In function `main':
> >     : undefined reference to `lcd_init'
> >     C:\WINDOWS\TEMP/ccULbaaa.o(.text+0xe2): In function `main':
> >     : undefined reference to `line1'
> >
> > The functions 'lcd_init' and 'line1' are contained in the lcdcntrl.o
file. I
> > kept playing around with it, and I found out that when I used the canned
> > makefile in winavr\sample\makefile and insert the line 'LDFLAGS +=
libtest2.a'
> > into the section labeled '# Additional libraries' the program compiles
just
> > fine. I'm assuming there is some command line argument that avr-gcc
needs that
> > the regular gcc compile doesn't, but what is it? Any and all help is
> > appreciated.
> >
>
> avr-gcc -mmcu=atmega128 test2.c -o test2.ex -ltest2
>
> Note:
> 1. -l flag (lowercase L). See GCC user manual.
> 2. Position of library, generally after the other objects. Again see GCC
user
> manual.
>

Thanks for the response. The -l flag only works if the library 'libtest2.a'
is in a specific location such as /lib or /avr/lib. Thats not a problem, but
weather or not I put it there or call it from the current directory, I still
get the linking error. There is some problem I'm having with telling avr-gcc
to look inside the library. That's why it works just fine when I use the
object files directly.

                                    -Nick

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