cmake ignores -D CMAKE_BUILD_TYPE=Debug

Question

I\'m just trying to build a cmake project in debug-mode to enable asserts. I tried the following versions:

cmake -D CMAKE_BUILD_TYPE:STRING=Debug -L ../../
cmake         


        

Answer 1

I assume that there is something wrong with your config..

I wrote a complete, simple example here: https://dl.dropboxusercontent.com/u/68798379/cmake-build-type.tar.bz2

cmake_minimum_required (VERSION 2.8)

project(playlib)

message("CMAKE_BUILD_TYPE = ${CMAKE_BUILD_TYPE}")

IF(CMAKE_BUILD_TYPE MATCHES Debug)
  message("Debug build.")
ELSEIF(CMAKE_BUILD_TYPE MATCHES Release)
  message("Release build.")
ELSE()
  message("Some other build type.")
ENDIF()

add_library(TESTLIB SHARED src/test.c)

When you execute cmake with

cmake -DCMAKE_BUILD_TYPE=Debug ../../

It gives the following output:

$ ./gen-linux.sh
-- The C compiler identification is GNU 4.8.2
-- The CXX compiler identification is GNU 4.8.2
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
CMAKE_BUILD_TYPE = Debug
Debug build.
-- Configuring done
-- Generating done
-- Build files have been written to: /home/wojci/stack-overflow/cmake-build-type/build/linux

It shows that CMAKE_BUILD_TYPE is being set from the command line and it being recognized in the CMakeLists.txt config.

What happens when you run it on your system using your version of CMake?

Answer 2

This works for me:

IF(${CMAKE_BUILD_TYPE} MATCHES Debug)
...
ENDIF()

Answer 3

Ok, fgrep -R "CMAKE_BUILD_TYPE" finally found the problem for me. In some CMakeLists.txt-file I found something like that:

SET( CMAKE_BUILD_TYPE Release ... FORCE )

That overrides every user defined parameters (because of the FORCE).

What works for me is that:

IF( NOT CMAKE_BUILD_TYPE )
   SET( CMAKE_BUILD_TYPE Release ... FORCE )
ENDIF()

Thank's for your hints!