digitalmars.D.learn - CMake and D
- Jan Allersma (58/58) Aug 04 2022 Hello,
- Johan (9/11) Aug 04 2022 Execute `dmd -v` on some test program. It will output the linker
- pascal111 (3/14) Aug 04 2022 It's nice feature in D that we can mix C code with it, because I
- Jan Allersma (11/22) Aug 06 2022 Thanks Johan!
- Jan Allersma (20/20) Aug 06 2022 I forgot that I have to add some DUB dependencies. So I have to
- Jan Allersma (19/39) Aug 06 2022 I figured out a strategy to solve te problem:
- rempas (5/25) Aug 07 2022 Thank you for posting the solution! And you were fast enough to
Hello,
I am trying to compile an application with both C++ and D source
code.
First I have `main.d`:
```
extern (C++) void init();
extern (C++) void draw(int row, int column, int x, int y);
extern (C++) void render();
void main() {
init();
draw(3, 3, 0, 0);
draw(3, 3, 2, 2);
draw(3, 3, 1, 1);
render();
}
```
And I have `viewer.cpp`:
```
void init() { ... }
void draw() { ... }
void render() { ... }
```
Lastly, I have `CMakeLists.txt`:
```
cmake_minimum_required (VERSION 3.0)
set(CMAKE_BUILD_TYPE Debug)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
project (framework)
add_executable(framework main.o viewer.cpp)
#INCLUDE(main.o)
INCLUDE(FindPkgConfig)
PKG_SEARCH_MODULE(SDL2 REQUIRED sdl2)
INCLUDE_DIRECTORIES(${SDL2_INCLUDE_DIRS})
target_link_libraries(framework ${SDL2_LIBRARIES})
```
I execute the following lines in my terminal:
```
dmd -c main.d
cd build
cmake ..
make
```
And I get this error:
```
/usr/bin/ld: ../main.o: in function `main':
main.d:(.text.main[main]+0xc): undefined reference to
`_d_run_main'
/usr/bin/ld: ../main.o:(.text.d_dso_init[.data.d_dso_rec]+0x22):
undefined reference to `_d_dso_registry'
```
So something goes wrong with linking, but I dont know what.
Aug 04 2022
On Thursday, 4 August 2022 at 20:29:30 UTC, Jan Allersma wrote:So something goes wrong with linking, but I dont know what.Execute `dmd -v` on some test program. It will output the linker line at the end of the output, the line starting with `cc yourcode.o -o yourcode ...`. On that linker line you will see what libraries to add in your CMake script, such that when linking the C++ program and D object files, it pulls in the libraries that D expects (standard library). cheers, Johan
Aug 04 2022
pascal111 <judas.the.messiah.111 gmail.com> On Thursday, 4 August 2022 at 20:59:50 UTC, Johan wrote:On Thursday, 4 August 2022 at 20:29:30 UTC, Jan Allersma wrote:It's nice feature in D that we can mix C code with it, because I know C is so jealous language.So something goes wrong with linking, but I dont know what.Execute `dmd -v` on some test program. It will output the linker line at the end of the output, the line starting with `cc yourcode.o -o yourcode ...`. On that linker line you will see what libraries to add in your CMake script, such that when linking the C++ program and D object files, it pulls in the libraries that D expects (standard library). cheers, Johan
Aug 04 2022
On Thursday, 4 August 2022 at 20:59:50 UTC, Johan wrote:On Thursday, 4 August 2022 at 20:29:30 UTC, Jan Allersma wrote:Thanks Johan! All I needed to do was to pass `phobos2` as argument for `target_link_libraries`. Now I am getting some errors on running: ``` double free or corruption (fasttop) Afgebroken (geheugendump gemaakt) ``` But that is an issue about something completely different, I presume. Thanks for the help!So something goes wrong with linking, but I dont know what.Execute `dmd -v` on some test program. It will output the linker line at the end of the output, the line starting with `cc yourcode.o -o yourcode ...`. On that linker line you will see what libraries to add in your CMake script, such that when linking the C++ program and D object files, it pulls in the libraries that D expects (standard library). cheers, Johan
Aug 06 2022
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.
Aug 06 2022
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`!
Aug 06 2022
On Saturday, 6 August 2022 at 18:22:45 UTC, Jan Allersma wrote: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`!Thank you for posting the solution! And you were fast enough to find it yourself before anyone can arrive with the solution ;) Happy coding my friend!
Aug 07 2022