[CMake] Variables in cmake-scripts

[Michael Jackson]

Oops.. Nice Catch.

I am going to hazard a guess and say that "Make" is running a new  
cmake instance with the install.cmake as its target script to run.  
This script will have NOTHING to do with the CMakeLists.txt file and  
therefor will have no idea about variables that are defined in the  
original CMakeLists.txt file.

   If presented with this I would probably opt to use a configured  
file such as:

install.cmake.in-----
EXECUTE_PROCESS(
  COMMAND "/bin/echo" "--test=$@TESTVAR@ --prefix=$ 
{CMAKE_INSTALL_PREFIX}"
  RESULT_VARIABLE AD_HDM_RV
)

Then in CMakeLists.txt:

configure_file ( ${PROJECT_SOURCE_DIR}/install.cmake.in $ 
{PROJECT_BINARY_DIR}/install.cmake )
INSTALL(SCRIPT ${PROJECT_BINARY_DIR}/install.cmake)

$ cmake -DTESTVAR=something
.
.
.
.
$ make install

--
Mike Jackson <www.bluequartz.net>


On Oct 2, 2009, at 10:35 AM, mereandor at gmail.com wrote:

> Isn't "cmake -DTESTVAR=something" supposed to do that?
>
> Am Freitag 02 Oktober 2009 16:30:44 schrieben Sie:
>> where is TESTVAR ever set?
>>
>> _________________________________________________________
>> Mike Jackson                  mike.jackson at bluequartz.net
>>
>> On Oct 2, 2009, at 10:20 AM, mereandor at gmail.com wrote:
>>> Hi!
>>>
>>> I have a question regarding cmake-scripts:
>>>
>>> I have this simple example:
>>>
>>> ----CMakeLists.txt----
>>> cmake_minimum_required(VERSION 2.6)
>>> SET(TEST CACHE STRING "test variable")
>>> INSTALL(SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/install.cmake)
>>>
>>> ----install.cmake----
>>> EXECUTE_PROCESS(
>>> COMMAND "/bin/echo" "--test=${TESTVAR} --prefix=$
>>> {CMAKE_INSTALL_PREFIX}"
>>> RESULT_VARIABLE AD_HDM_RV
>>> )
>>>
>>> Here is the input and output that I get:
>>>
>>> $ cmake -DTESTVAR=something
>>> -- The C compiler identification is GNU
>>> -- The CXX compiler identification is GNU
>>> -- Check for working C compiler: /usr/bin/gcc
>>> -- Check for working C compiler: /usr/bin/gcc -- 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
>>> -- Configuring done
>>> -- Generating done
>>> -- Build files have been written to: /home/mereandor/test
>>> $ make install
>>> Install the project...
>>> -- Install configuration: ""
>>> --test= --prefix=/usr/local
>>>
>>> Why is ${CMAKE_INSTALL_PREFIX} set and ${TESTVAR} not?
>>>
>>> thanks in advance for any help
>>>
>>> regards