How to compile additional source files in cmake after the build process

I have a project in cmake for windows which contains a Pro*C source file called database.proc, my goal is to generate a C source file from the .proc file and add it to the project to be linked along the other source files, I've tried to add a custom command to achieve this without success

add_custom_command(TARGET myproj OUTPUT PRE_LINK
            ${PROJECT_SOURCE_DIR}/connection.c )

Is there some way to do this?


I'm not familiar with Pro*C, but it looks like you're mixing together the two different versions of add_custom_command.

The first version add_custom_command(OUTPUT ...) is used to generate a file which is then added as a dependency of another CMake target. When that target is built, the custom command is executed first in order to generate the output file.

The second version add_custom_command(TARGET ...) is used to define a pre-build, pre-link or post-build command; one which does not necessarily create a file, but which executes in conjunction with building the associated target.

If you only have one target which depends on the output of Pro*C, then the first version is probably your best bet:

add_custom_command(OUTPUT ${PROJECT_SOURCE_DIR}/connection.c
add_executable(myproj ${PROJECT_SOURCE_DIR}/connection.c <other sources>)

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