Re: Help Linking Shared Objects for Library Use

[Simon Wright <simon@pushface.org>]

patrick@spellingbeewinnars.org writes:

> gnatmake barn.adb -lsounds
> gcc-4.6 -c -lsounds barn.adb
> gcc-4.6 -c -lsounds cow.ads
> gnatbind -x barn.ali
> gnatlink barn.ali
> ./barn.o: In function `_ada_barn':
> barn.adb:(.text+0x9): undefined reference to `moo'
> collect2: ld returned 1 exit status
> gnatlink: error when calling /usr/bin/gcc-4.6
> gnatmake: *** link failed.
>  
> When I look at the Ada library code installed from my repo it has .ali
> files but I don't think I am generating cow.ali

Well, are you or aren't you? is it there or not?

> Is there a step I am missing to build cow.ads properly? or am I doing
> something else wrong?

You might have thought that gnatmake would report that it's going to
ignore that '-lsounds' at the link phase, after uselessly passing it
through to the compile phase. Interestingly, it does recognise that -L
only needs to be passed through to the link phase.

The answer is to say

   $ gnatmake barn.adb -largs -lsounds

> Thanks for reading-Patrick

I very nearly didn't, because of the careless formatting of the code.