On Wednesday 09 May 2012, Michael Wild wrote: > On 05/08/2012 11:13 PM, Dave Abrahams wrote: > > on Tue May 08 2012, Alexander Neundorf <a.neundorf-work-hi6Y0CQ0nG0-AT- public.gmane.org> wrote: > >> On Tuesday 08 May 2012, Dave Abrahams wrote: > >>> Here's another one! > >>> > >>> Scenario: > >>> > >>> * I am running CMake under 0install to build and install libraries > >>> > >>> * Each library builds a package SomePackage for the library binaries > >>> and another package SomePackage-dev for the library headers (and > >>> import libraries on Windows) > >>> > >>> * The FindSomePackage.cmake file is part of the -dev package > >>> > >>> * After building, 0install moves each package's build products into a > >>> mostly-unpredictable subdirectory of its otherwise-read-only "cache" > >>> (~/.cache/0install.net/). The subdirectory's name is determined by a > >>> hash of the files. > >>> > >>> * To get this working, I followed the scheme discussed here: > >>> > >>> http://news.gmane.org/find-root.php?message_id=%3cm2lil6s8jq.fsf%40plut > >>> o.l uannocracy.com%3e > >>> > >>> Summary: > >>> > >>> 1. Create a 0install "SomePackage-preinstall" package. Building this > >>> package involves CMake building and installing both SomePackage and > >>> SomePackage-dev into separate subdirectories (main/ and dev/) of > >>> some prefix. 0install thereafter moves the whole directory tree > >>> into its cache in a directory called sha1=someuglyhash > >>> > >>> 2. SomePackage's 0installation procedure is to copy > >>> sha1=someuglyhash/main/ into its distribution directory (which then > >>> ends up in > >>> ~/.cache/0install.net/sha1=otheruglyhash) > >>> > >>> 3. SomePackage-dev's 0installation procedure is to copy > >>> sha1=someuglyhash/dev/ into its distribution directory > >>> > >>> Problem: FindSomePackageConfig.cmake now has the wrong path to the > >>> library binaries. > >>> > >>> Any help most appreciated. > >> > >> Can you please summarize what you actually want to achieve ? > > > > Well, I tried to, above. > > > > In short, I want to create separate main and -dev packages without > > building twice, under the constraints imposed by 0install. > > > >> Do you say that libFoo installs a FindFoo.cmake as part of libFoo-devel > >> ? > >> > >> If that's the case, then this is wrong. > > > > I'm sorry, that *is* wrong. It installs a FooConfig.cmake as part of > > libFoo.devel > > > >> FindFoo.cmake must be part of the using software, not of the software to > >> be searched. > >> > >> Why do you have to find the installed library in this cache directory > >> ? > > > > Because, in a 0install world, that's where things go when you "install" > > them. > > Ok, how you do it along these lines: > > CMakeLists.txt: > #-------------- BOF > > cmake_minimum_required(VERSION 2.8 FATAL_ERROR) > project(Foo) > > set(FOO_VERSION 1.2.3) > > # initialize (absolute) installation directory variables > set(INSTALL_BIN_DIR bin CACHE PATH "Install path for binaries") > set(INSTALL_LIB_DIR lib CACHE PATH "Install path for libraries") > set(INSTALL_INCLUDE_DIR include CACHE PATH "Install path for headers") > # this is for UNIX systems, see docs of find_package() for the search > # paths on APPLE and WIN32 > set(INSTALL_CMAKE_DIR lib/foo-${FOO_VERSION}/cmake CACHE PATH > "Install path for CMake files") > foreach(t BIN LIB INCLUDE CMAKE) > if(NOT IS_ABSOLUTE ${INSTALL_${t}_DIR}) > set(INSTALL_${t}_DIR ${CMAKE_INSTALL_PREFIX}/${INSTALL_${t}_DIR}) > endif() > mark_as_advanced(INSTALL_${t}_DIR) > endforeach() > > # configure FooConfig.cmake and friends. FooConfig.cmake must be able > # to locate FooExports.cmake and FOO_INCLUDE_DIR relative to its own > # directory without using absolute paths. > configure_file(cmake/FooConfig.cmake.in > ${PROJECT_BINARY_DIR}/FooConfig.cmake @ONLY)
Please have a lokok at the new macro configure_package_config_file() which is in cmake 2.8.8. This helps a lot with writing config files which are relocatable. The Config.cmake.in file has to contains a few special variables/macros: @PACKAGE_INIT@ set(FOO_INCLUDE_DIR "@PACKAGE_INSTALL_INCLUDE_DIR@" ) set(FOO_BIN_DIR "@PACKAGE_INSTALL_BIN_DIR@" ) i.e. for every FOO_XYZ variable use a @PACKAGE_FOO_XYZ@ variable, and the configure_package_config_file() will replace this with the help of the @PACKAGE_INIT@ macro with a relocatable version. http://www.cmake.org/cmake/help/v2.8.8/cmake.html#module:CMakePackageConfigHelpers > configure_file(cmake/FooConfigVersion.cmake.in > ${PROJECT_BINARY_DIR}/FooConfigVersion.cmake @ONLY) > > # configure the headers into the build tree so the package can be used > # without installing it and not hard-coding the source/build directory > # information into FooConfig.cmake > configure_file(include/foo.h > ${PROJECT_BINARY_DIR}/include/foo.h COPYONLY) The input file should have a suffix which indicates it is a file which is intended to be configured, usually foo.h.in. Alex
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