[CMake] Using modules, adjusting CMAKE_MODULE_PATH

[Thomas Lehmann]

I have not changed anything in the source tree
and the current folder for the build tree is
empty before I start calling cmake.

The build is working fine (by the way) but this
warning disturbs.

CMP0011: Included scripts do automatic cmake_policy PUSH and POP.

I'm not sure what I should do now.
I have created a simple macro only including this in a project.

FindAllOptions.cmake:
cmake_minimum_required(VERSION 2.6)

macro(requires_lib target sources binaries)
    if (TARGET ${target})
        link_directories(${CMAKE_CURRENT_SOURCE_DIR}/${sources}/${target}
                         ${CMAKE_BINARY_DIR}/${binaries}/${target})
    else  (TARGET ${target})
        add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/${sources}/${target}
                         ${CMAKE_BINARY_DIR}/${binaries}/${target})
    endif (TARGET ${target})
endmacro(requires_lib)

Used here in a CMakeLists.txt:
# ensuring that packages are found
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH}
                      ${CMAKE_CURRENT_SOURCE_DIR}/../../cmake/modules)

# most common options, macros, ... required by most projects
find_package(AllOptions)

project(app2)

# defining include dependencies:
include_directories( ../../libs/one
                     ../../libs/two)

requires_lib(one ../../libs libs)
requires_lib(two ../../libs libs)

# all sources of current folder are required for this application:
file(GLOB sources *.cxx)

# defining the build target with the found sources:
add_executable(app2 ${sources})

# linking libraries to the application:
target_link_libraries(app2 one two)


>

Thomas Lehmann
Scrum Master

RTS Realtime Systems Software GmbH, Rembrandtstrasse 13, D-60596 Frankfurt am Main
T: +49.69.61009.0 / F: +49.69.61009.181

Sitz: Frankfurt am Main - HRB 84467 Amtsgericht Frankfurt am Main
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-----Original Message-----
> From: cmake-bounces at cmake.org [mailto:cmake-bounces at cmake.org] On Behalf
> Of Rolf Eike Beer
> Sent: Dienstag, 2. November 2010 14:01
> To: cmake at cmake.org
> Subject: Re: [CMake] Using modules, adjusting CMAKE_MODULE_PATH
>
> > Hi all,
> >
> > your solution is working fine but I got this message:
> >
> > CMake Error: The source
> > "F:/Checkouts/prototyping/cmake_sandbox/CMakeLists.txt" does not match
> the
> > source "F:/Checkouts/prototyping/cmake_sandbox/rtd/CMakeLists.txt"
> used to
> > generate cache.  Re-run cmake with a different source directory.
> >
> > f:\Checkouts\prototyping\cmake_sandbox\obj>cmake ../rtd
> > CMake Warning (dev) at app2/CMakeLists.txt:6 (find_package):
> >   Policy CMP0011 is not set: Included scripts do automatic
> cmake_policy
> > PUSH
> >   and POP.  Run "cmake --help-policy CMP0011" for policy details.  Use
> the
> >   cmake_policy command to set the policy and suppress this warning.
> >
> >   The included script
> >
> >
> F:/Checkouts/prototyping/cmake_sandbox/cmake/modules/FindAllOptions.cmak
> e
> >
> >   affects policy settings.  CMake is implying the NO_POLICY_SCOPE
> option
> > for
> >   compatibility, so the effects are applied to the including context.
> > This warning is for project developers.  Use -Wno-dev to suppress it.
> >
> > -- Configuring done
> > -- Generating done
> > -- Build files have been written to:
> > F:/Checkouts/prototyping/cmake_sandbox/obj
>
> You try to reuse a CMake build try. That will never work. Once you have
> configured a build tree the source directory (the location, not the
> contents) must not change. Use multiple build trees.
>
> Eike
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