Selective compiling in CMake by passing command line arguments

Question

I have three programs, for example: program_1.cpp, program_2.cpp and program_3.cpp.

As of now, I have separate makefiles to build these programs.

I would like to implement in this in the below manner.

cmake "program_1" # program_1.cpp has to compile cmake "program_2" # program_2.cpp has to compile cmake "program_3" # program_3.cpp has to compile

Could you suggest me the ways to achieve this?

[UPDATE]:

I am using a shell script in order to compile the program. For example

bash build_script.sh build

This would compile the file program_1.cpp and generates the executables.

In the same manner, I would like to implement the below approach.

bash build_script.sh build program_1 -- build program_1.cpp bash build_script.sh build program_2 -- build program_2.cpp bash build_script.sh build program_3 -- build program_3.cpp

Just to be clear: do you want to have cmake conditionally only generate makefiles for one program, or do you want to be able to compile only one program at a time from the makefiles generated by cmake? — user4442671
– user4442671, Commented Jul 24, 2018 at 2:31
Both the approaches should be fine assuming that only one program runs at a time when I give cmake "program_1".... — KK2491
– KK2491, Commented Jul 24, 2018 at 5:43

user4442671 · Accepted Answer · 2018-07-24 05:59:03Z

When generating makefiles, cmake creates a make target for each add_executable() call, so it's only matter of using make target on the makefiles that are generated by cmake:

CMakeLists.txt:

... add_executable(program_1 prog1.cpp) add_executable(program_2 prog2.cpp) add_executable(program_3 prog3.cpp)

And then when comes time to build:

cmake path/to/source/dir make program_1

Thanks for the steps. I got the clear picture how to select particular program while compiling. I will be updating the question. Please check.

OrenIshShalom · Accepted Answer · 2018-07-24 04:15:37Z

Assuming you meant three different targets to compile, you can have a simple makefile:

.PHONY program_1: program_1: gcc -o program_1 program_1.cpp .PHONY program_2: program_2: gcc -o program_2 program_2.cpp .PHONY program_3: program_3: gcc -o program_3 program_3.cpp

Then you can simply do:

make program_2

To compile just program_2. This has nothing to do with cmake however.

Thanks for the answers. Will try the method and let you know.

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