That's a linker error, meaning the missing symbol isn't
available to link into the executable. You need to compile the
source of all the libraries you use and make sure the resultant
binaries are available for the linker to link into the
executable.
The -I switch you've passed tells the compiler where to find
imported modules. The compiler needs parse them to know which
symbols are available for you to use when it's compiling your
code. (The current working directory is the default anyway, so
you don't need to pass `-I.` for that.)
By default, the compiler does not compile imported modules. If
you add `-i` to the command line, then it will compile all of
the modules you import (as long as they're in the `-I` path),
excluding the DRuntime and Phobos modules. It will then also
pass all of the compiled object files to the linker, so then
your linker error should go away.
Using `-i` solved my problem, thank you very much!
However, when you choose not to use dub, you need to also
ensure that you are accounting for any special compiler flags
the libraries you use may require (for example, specific
`-version` values). If they're configured to compile as static
or shared libraries, it may be easier just to store the source
for each of them outside of your project's source tree, use dub
to build each of them, and then pass the compiled libraries to
the compiler when you build your program. In that case, you
wouldn't use `-i`. Just make sure that `-I` is correctly
configured in that case.
Okay, thanks.
