Passing the argument to CMAKE via command prompt

Question

I have a makefile for my project and also I am passing some argument and based on that argument i am seting some flag  I am able to do this   but now I want to do the same using cmake  I have created cmakelist txt but I don t know how to pass the argument and check for the argument value in cmakelist txt   Sample of my makefile   ifeq    FAB    po          setting some flags else         setting some iother flag endif   What is the way to take the argument from command prompt and set flags based on that

User · Answer

In the CMakeLists txt file  create a cache variable  as documented here   SET FAB  po  CACHE STRING  Some user-specified option     Source  http   cmake org cmake help v2 8 8 cmake html command set  Then  either use the GUI  ccmake or cmake-gui  to set the cache variable  or specify the value of the variable on the cmake command line   cmake -DFAB STRING po   Source  http   cmake org cmake help v2 8 8 cmake html opt -Dvar typevalue  Modify your cache variable to a boolean if  in fact  your option is boolean

User · Answer

CMake 3 13 on Ubuntu 16 04   This approach is more flexible because it doesn t constraint MY VARIABLE to a type     cat CMakeLists txt  message  MY VARIABLE   MY VARIABLE    if  MY VARIABLE        message  MY VARIABLE evaluates to True   endif      mkdir build  amp  amp  cd build    cmake    MY VARIABLE  -- Configuring done -- Generating done -- Build files have been written to   path to build    cmake    -DMY VARIABLE True MY VARIABLE True MY VARIABLE evaluates to True -- Configuring done -- Generating done -- Build files have been written to   path to build    cmake    -DMY VARIABLE False MY VARIABLE False -- Configuring done -- Generating done -- Build files have been written to   path to build    cmake    -DMY VARIABLE 1 MY VARIABLE 1 MY VARIABLE evaluates to True -- Configuring done -- Generating done -- Build files have been written to   path to build    cmake    -DMY VARIABLE 0 MY VARIABLE 0 -- Configuring done -- Generating done -- Build files have been written to   path to build

[makefile] Passing the argument to CMAKE via command prompt

Examples related to makefile

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