[CMake] project directive overwrites CMAKE_INSTALL_PREFIX?

[J Decker]

I find it's better to define CMAKE_INSTALL_PREFIX on the command line when
building

I do have this bit of code...

IF(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
  SET(CMAKE_INSTALL_PREFIX
    ${CMAKE_BINARY_DIR}/../${CMAKE_BUILD_TYPE}_out CACHE PATH "Install
default 'out' in this directory." FORCE
    )
ENDIF(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)


which keeps it from overwriting an already set value (from the command
line); and make sure it's in the cache so cmake-gui can edit it...

(if  project() does something with cmake_isnstall_prefix might also be a
bug)

On Thu, Dec 4, 2014 at 7:27 PM, Chris Johnson <cxjohnson at gmail.com> wrote:

> I have a global include file used by all of the CMakeLists.txt files in my
> project. In it, I set the value of CMAKE_INSTALL_PREFIX, as well as a
> number of other variables and functions.
>
> In my CMakeLists.txt file, I had this:
>
> cmake_minimum_require(VERSION 2.8.4)
> include(global.inc)
> project(whatever)
>
> When I run cmake, the value of CMAKE_INSTALL_PREFIX is lost! Instead, in
> the resulting cmake_install.cmake file has been defaulted back to
> /usr/local which is completely wrong.
>
> However, if I change the order to this:
>
> cmake_minimum_require(VERSION 2.8.4)
> project(whatever)
> include(global.inc)
>
> It appears to work.
>
> I find nothing in the documentation saying that the project() directive
> will set CMAKE_INSTALL_PREFIX.
>
> Even more strangely, if I run cmake a second time with the first
> configuration (include before project), it will rewrite cmake_install.cmake
> with the correct value.
> ​ ​
> That is, the behavior of cmake appears to be different based on whether
> the build directory is empty or already contains cmake_install.cmake and
> CMakeCache.txt files
> ​, even though they contain the wrong path value for CMAKE_INSTALL_PREFIX.​
>
> What is going on here?
>
>
>
>
>
>
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