On Saturday, 6 August 2022 at 13:52:28 UTC, Jan Allersma wrote:
I forgot that I have to add some DUB dependencies. So I have to
use `dub` instead of `dmd`.
My strategy is to
1) Create a D function which will be called in C++.
2) Build a static library containing the D function (using `dub
build`).
3) Build an executable file with CMake.
However, I get an `ld` error:
```
/usr/bin/ld:
../libhello-sdl.a(app_1_144.o):(.text.d_dso_init[.data.d_dso_rec]+0x22): undefined reference to `_d_dso_registry'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/framework.dir/build.make:85:
framework] Fout 1
make[1]: *** [CMakeFiles/Makefile2:76:
CMakeFiles/framework.dir/all] Fout 2
make: *** [Makefile:84: all] Fout 2
```
I do not know what `_d_dso_registry` is. Therefore, I don't
know how to solve this problem.
I figured out a strategy to solve te problem:
1) Create a C++ function which will be called in D.
2) Build a static C++ library with CMake and add dependencies (In
my case: SDL libraries)
3) Create a new project (`dub init`).
4) Add these lines to `dub.json`:
```
"dflags": ["-L-lstdc++"],
"lflags": ["-Lbuild", "-lframework", "-lSDL2"],
```
- `-L-lstdc++` is needed to use standard C++ functions.
- `-Lbuild` is to add the `build` directory a library path (this
is the directory where my earlier compiled C++ library is in).
- `-lframework` is used to link my earlier compiled C++ library
`libframework.a`.
- And finally `-lSDL2` because that is a dependency used by my
C++ library.
Now I can add dependencies for my D code as well using `dub add`!
