How to use CMAKE INSTALL PREFIX

Question

I want to generate Makefile with install target  making installation to  usr instead of default  usr local  Assuming that build directory is done in the source subdirectory  I execute   cmake -DCMAKE INSTALL PREFIX PATH  usr     CMakeCache txt contains  CMAKE INSTALL PREFIX PATH  usr  OK    Now I execute    make make install   All files are still installed to usr local  What is wrong   Edit  There is no CMAKE INSTALL PREFIX in any of CMakeLists txt project files   Before running cmake  I delete everything from the output directory  install directives in CMakeLists txt look like    install TARGETS mylibrary DESTINATION lib

User · Accepted Answer

That should be  see the docs    cmake -DCMAKE INSTALL PREFIX  usr

User · Answer

But do remember to place it BEFORE PROJECT  lt  project name   command    otherwise it will not work    My first week of using cmake - after some years of GNU autotools - so I am still learning  better then writing m4 macros   but I think modifying CMAKE INSTALL PREFIX after setting project is the better place   CMakeLists txt  cmake minimum required  VERSION 2 8   set  CMAKE INSTALL PREFIX  foo bar bubba  message  CIP     CMAKE INSTALL PREFIX   should be  foo bar bubba   project  BarkBark  message  CIP     CMAKE INSTALL PREFIX   should be  foo bar bubba   set  CMAKE INSTALL PREFIX  foo bar bubba  message  CIP     CMAKE INSTALL PREFIX   should be  foo bar bubba     First run  no cache   CIP    foo bar bubba  should be  foo bar bubba -- The C compiler identification is GNU 4 4 7 -- etc  etc     CIP    usr local  should be  foo bar bubba CIP    foo bar bubba  should be  foo bar bubba -- Configuring done -- Generating done   Second run  CIP    foo bar bubba  should be  foo bar bubba CIP    foo bar bubba  should be  foo bar bubba CIP    foo bar bubba  should be  foo bar bubba -- Configuring done -- Generating done   Let me know if I am mistaken  I have a lot of learning to do  It s fun

User · Answer

There are two ways to use this variable    passing it as a command line argument just like Job mentioned    cmake -DCMAKE INSTALL PREFIX  lt  install path  gt     assigning value to it in CMakeLists txt   SET CMAKE INSTALL PREFIX  lt  install path  gt    But do remember to place it BEFORE PROJECT  lt  project name gt   command  otherwise it will not work

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