Dimitry Golubovsky wrote: > I need to declare a symbol which is weaker in the executable than in any > external static or dynamic library.
> In other words, the executable provides some fallback function > implementation (in my example, for "write"). But if the linker or > dynamic linker resolves it, the symbol definition from an external > library must be used. H. J. Lu wrote: The weak symbol is different from the normal one only during creating executable or shared library if it is in a relocatable file. You can't use weak symbol for your purpose. But you can mark your symbol in shared library protected. ================= Well, libraries are not created by me, so I cannot rely on any possibility to mark symbols in it. Besides, this is for an automated tool which may deal with tens of functions at once (this is for a Haskell FFI generator known as `hsffig' that I am developing). If there is no way to declare overridable symbols in executables, then perhaps placing all those fallback stub functions in a separate static library (.a) and telling the linker to use it last (after all default and user-specified libraries) could do the job, couldn't it? This is less desirable though, as it complicates the linker command line, but if there is no way to do this via declaration in C code, I'll go with the library. -- Dimitry Golubovsky Anywhere on the Web
