4.11 My Compiler/Linker is complaining about missing symbol xxx.
Description
This article is from the Amiga FAQ, by Ignaz Kellerer with numerous contributions by others.
4.11 My Compiler/Linker is complaining about missing symbol xxx.
First be sure, that the function is really missing: For example floating point functions are in a special link library and you need a linker option like `-lm' to include it into your program. Another possibility would be that you are using a library function and didn't notice it. This might lead to a missing library base, `IntuitionBase' for example. In that case just put something like struct Library *IntuitionBase;
somewhere in the global part of your program. (Don't forget to call OpenLibrary() and CloseLibrary! :-)
However, you could as well use a function which really isn't present in your library at all. If you have, for example, an amiga.lib from 2.0 you would hardly find the locale functions or the pool memory functions. (1) Best solution is to get the NDU (see Includes), but you probably don't want to wait for it. In that case you have to find what kind of function you are missing. * Simple library functions (Examples: `exec/AllocPooled', `locale/OpenCatalogA') can be called with pragmas. However, you need informations on the name of the library base and where to put the arguments. See Pragmas.
* Tag functions are mostly just stub functions which call library functions. If you have, for example, `dos/AllocDosObject' which expects a constant and a pointer to an array of tags, you have the varargs version `AllocDosObjectTags' which expects tags on the stack as well! Just create the following function: #include <clib/dos_protos.h> #include <pragmas/dos_pragmas.h> /* Probably wrong name */
void *AllocDosObjectTags(ULONG objtype, Tag tag1, ...) { return(AllocDosObject(objtype, (struct TagItem *) &tag1); }
* Some functions still remain: Amiga.lib has some functions which are really doing valuable things and not just call a library: The BOOPSI functions (`DoMethod', `DoSuperMethod') the memory pool functions (`LibAllocPooled', `LibCreatePool', which are replacements of 3.0 functions). The only way to replace these is to get equivalents. The AmigaFAQ archive contains some of them (DoMethod, DoSuperMethod and HookEntry) in the `programmer' directory as well as the most common pragma files and some examples of varargs functions. See Amiga-FAQ Archive.
---------- Footnotes ----------
(1) This problem arises most frequently for owners of Aztec which is no longer supported and owners of Dice, which has sometimes rather incomplete libraries. I own both ...
Continue to:
My Books
