Information about PRPNet Build Errors on Linux

[hangxanh]

Hi. I've tried numerous times to build PRPNet on Linux, with no success. The error message says that it cannot be linked. Any solutions? Trying to use PRPNet 5.0.7 on Kubuntu 11.10 (soon to be 12.04) x64.
thank's.

[amphoria]

If it's the same error as I got, then the linking will work if you move -lpthread after all the object files on the line that links prpserver. Goodness knows why Ubuntu requires this but it does work if the error message relates to functions in the pthread library.

[Dubslow]

Originally Posted by amphoria

If it's the same error as I got, then the linking will work if you move -lpthread after all the object files on the line that links prpserver. Goodness knows why Ubuntu requires this but it does work if the error message relates to functions in the pthread library.

The way ld parses parameters means that how it searches for unlinked symbols depends on the order of the parameters.

Namely, when searching a targeted -l<whatever>, it doesn't create a list of all symbols in that lib, but rather only looks for any currently-unlinked symbols in the lib.

So if it searches the lib *before* the unlinked-symbol is declared, it will declare that symbol unlinked, even though the correct lib is in the command. The solution is to put all libs last.

This "bug" has been a well known issue for years, and sadly can be quite difficult to diagnose (especially for beginners/those who haven't encountered it before) because it's such an unintuitive problem (and the error message it produces it entirely unrelated to the error).