CMake: Read build number from file to set a variable

Question

I\'m working on a project where the build number is stored in a file called \'BuildNumber.txt\' at the root of the project. What I\'d like to do is have CMake read the numb

Answer 1

You can use the CMake command file (STRINGS ...) for that purpose. Assuming the build number is located in the file BuildNumber.txt in a single line, the following command will read it into the CMake variable BUILD_NUMBER:

file (STRINGS "BuildNumber.txt" BUILD_NUMBER)

Also see the file command reference.

Answer 2

I don't know your OS, but I assune that you are using Windows or Linux.

if (UNIX)
  set (show_contents_prog cat)
elseif (WIN32)
  set (show_contents_prog type)
endif (WIN32)

execute_process(COMMAND ${show_contents_prog} input.txt OUTPUT_VARIABLE file_contents)

I think this may help.