port a variable form make to Cmake

Question

Our Library uses Cmake while the Overall system uses Make file for build.

I want to port the value of a variable (preprocessor macro) defined in the makefile to Cmakefile and use it as preprocessor marco in source codes of my library.

How to do that?

You'll have to tell us more about how CMake is integrated into the Makefile. — Angew is no longer proud of SO
– Angew is no longer proud of SO, Commented Feb 5, 2014 at 18:13

Eric Fortin · Accepted Answer · 2014-02-05 18:26:48Z

1

You can define variable at CMake invocation like so:

cmake -DMY_VAR=ON <path_to_CMakeLists.txt>

Then later in your CMake file:

if (MY_VAR)
    add_definitions(-DENABLE_MY_VAR)
endif()

And finally in your code:

#ifdef ENABLE_MY_VAR
    // Your code
#endif

answered Feb 5, 2014 at 18:26

Eric Fortin

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8 Comments

user1816574 Over a year ago

can you please elaborate this? cmake -DMY_VAR=ON <path_to_CMakeLists.txt> Do I do this in makefile?

Eric Fortin Over a year ago

It is not clear from your question how CMake is triggered. Is it launched when you run make in the global project ?

user1816574 Over a year ago

yes ... global project is built using make...which will also trigger cmake to build our library as a shared library.

Eric Fortin Over a year ago

So when make launches cmake to generate makefiles, you can pass it variables based on the make variable by formatting the launch command accordingly. Adding example of the variable you want to pass on and the snippet from your makefile launching CMake will help in giving an answer.

user1816574 Over a year ago

it is sth like this @cd $(PROJECT_DIR)/build/CMake && ./bootstrap.sh

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