On Monday 23 February 2009 01:39:52 Allan Caffee wrote: > Indeed I tried a very similiar scenario using gcc 4.2.4 on Ubuntu > (with a static library) and had the same problem. Unsurprising, since you have specified your g++ command incorrectly. > Was the error similiar to your original post? A linker error? We > must be missing something pretty obvious here. You are -- *user* error! You gave an example of g++ usage, which was effectively equivalent to: $ g++ -L /path/to/my/libs -lbar foo.cpp This is just plain wrong. You are asking ld (indirectly) to search in libbar.a, for any symbols to satisfy any dependencies it has already identified, AT THE TIME WHEN IT SCANS THE LIBRARY. Since arguments to ld are processed in strictly left to right order, there are no such symbol dependencies at this time; (the dependencies will not be discovered until *after* foo.cpp has been processed, and that happens too late to fetch in *anything* from libbar.a, so libbar.a becomes effectively unused, in this scenario. You *must* specify your source or simple object files, *before* any library you wish to search for symbols used by them. Thus, the correct usage is: $ g++ foo.cpp -L /path/to/my/libs -lbar This illustrates a very common user error, and many users complain that ld must be broken, when they commit it. This is particularly true of users coming from GNU/Linux to MS-Win32 development, because they have developed a *bad* *habit* on GNU/Linux; when linking to a *shared* object library, the misplacement of the library spec may be forgiven by the ELF gnu-ld, but it is still an error, and it will be severely punished by the PE-COFF gnu-ld on MS-Win32. In the case of *static* libraries, this error will also be punished on GNU/Linux, just as it is on MS-Win32. On the gcc, or g++ command line, libraries *must* *always* be specified *after* the source or object files which refer to them. -- Regards, Keith. _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf
