Question about add_custom_command

Code
1

Hi,

I am building with cmake + gnu c/c++ (MINGW) under Windows 10. I use add_custom_command to let a program (the name is ‘fluid’) to compiler some other resource files. Like this:
add_custom_command(
OUTPUT “${basename}.cxx” “${basename}.h”
COMMAND fluid -c ${CMAKE_CURRENT_SOURCE_DIR}/${src}
DEPENDS ${src}
MAIN_DEPENDENCY ${src}
)
The program is built by that project.
add_subdirectory(fluid)
set(FLTK_FLUID_EXECUTABLE fluid)
set(FLUID fluid) # export

From here add_custom_command — CMake 3.19.2 Documentation

It says: " If COMMAND specifies an executable target name (created by the add_executable() command), it will automatically be replaced by the location of the executable created at build time if either of the following is true:"

The problem I have is that the program is replaces in an relative path, something like this: …/myfolde/fluid.exe, but this can’t be executed in a DOS terminal.

My question is how can I let it in absolute path way?

Regards,

Cean

2

You can use $<TARGET_FILE:fluid> which should get the full path. Though I’d expect the slashes to be output in the right way anyways…

@brad.king

3

The use of / or \ in the generated build system depends on what generator is being used. It corresponds to whatever direction is preferred by the corresponding make tool and its shell.

@ceanwang what generator are you using?

4

I am using “Unix Makefiles”, but under Windows 10 to compile with gnu c/c++. Maybe this is the problem.

5

That probably is the problem. That should work under a Cygwin environment (with a Cygwin build of CMake), but the NMake Makefiles may also work better? The Ninja generator is probably your best bet though.

6

If you want to stick with Makefiles, you should use MinGW Makefiles generator.

7

Use MinGW Makefiles solved the problem.

Its writes out is .\myfolde\fluid.exe and this form could be run under DOS terminal.

Thanks all for the help.