[CMake] I can not set CMAKE_BUILD_TYPE in CMakeList.txt

[Attila Krasznahorkay]

Hi Isaac,

ccmake will only allow you to modify cache variables. When you call

set( CMAKE_BUILD_TYPE RelWithDebInfo )

, this creates a local variable in your CMakeLists.txt file. This way it should *always* override whatever you set on the command line, or as a cache variable.

If you want to set the default value to RelWithDebInfo, but allow the user to override it either with ccmake or a command line argument, you should do something like:

set( CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING "Build type" )

At least I think it should work like this...

Cheers,
              Attila

> On 05 Jan 2016, at 08:11, Isaac Ge <acgtyrant at gmail.com> wrote:
> 
> Hi anyone, I find the `set(CMAKE_BUILD_TYPE RelWithDebInfo)` in CMakeList.txt does not work, because the actual build type show by ccmake is empty. So I have to enter the correct build type in ccmake or add command argument `-D CMAKE_BUILD_TYPE=RelWithDebInfo` while cmake.
> 
> Any idea? Thank you!
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