2006-09-19 20:11:53 +00:00
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# - Try to find BZip2
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# Once done this will define
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#
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# BZIP2_FOUND - system has BZip2
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# BZIP2_INCLUDE_DIR - the BZip2 include directory
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# BZIP2_LIBRARIES - Link these to use BZip2
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# BZIP2_NEED_PREFIX - this is set if the functions are prefixed with BZ2_
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2012-01-10 13:00:52 +00:00
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# BZIP2_VERSION_STRING - the version of BZip2 found (since CMake 2.8.8)
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2006-09-19 20:11:53 +00:00
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2009-09-28 15:45:50 +00:00
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#=============================================================================
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2012-01-10 13:12:09 +00:00
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# Copyright 2006-2012 Kitware, Inc.
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2009-09-28 15:45:50 +00:00
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# Copyright 2006 Alexander Neundorf <neundorf@kde.org>
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2012-01-10 13:12:09 +00:00
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# Copyright 2012 Rolf Eike Beer <eike@sf-mail.de>
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2006-09-19 20:11:53 +00:00
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#
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2009-09-28 15:45:50 +00:00
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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2010-08-07 00:48:47 +00:00
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# (To distribute this file outside of CMake, substitute the full
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2009-09-28 15:45:50 +00:00
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# License text for the above reference.)
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2006-09-19 20:11:53 +00:00
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2012-06-05 20:01:54 +00:00
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SET(_BZIP2_PATHS PATHS
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"[HKEY_LOCAL_MACHINE\\SOFTWARE\\GnuWin32\\Bzip2;InstallPath]"
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)
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FIND_PATH(BZIP2_INCLUDE_DIR bzlib.h ${_BZIP2_PATHS} PATH_SUFFIXES include)
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2006-09-19 20:11:53 +00:00
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2012-01-10 13:12:09 +00:00
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IF (NOT BZIP2_LIBRARIES)
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2012-06-05 20:01:54 +00:00
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FIND_LIBRARY(BZIP2_LIBRARY_RELEASE NAMES bz2 bzip2 ${_BZIP2_PATHS} PATH_SUFFIXES lib)
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FIND_LIBRARY(BZIP2_LIBRARY_DEBUG NAMES bzip2d ${_BZIP2_PATHS} PATH_SUFFIXES lib)
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2012-01-10 13:12:09 +00:00
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INCLUDE(${CMAKE_CURRENT_LIST_DIR}/SelectLibraryConfigurations.cmake)
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SELECT_LIBRARY_CONFIGURATIONS(BZIP2)
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ENDIF (NOT BZIP2_LIBRARIES)
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2006-09-19 20:11:53 +00:00
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2012-01-10 13:00:52 +00:00
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IF (BZIP2_INCLUDE_DIR AND EXISTS "${BZIP2_INCLUDE_DIR}/bzlib.h")
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FILE(STRINGS "${BZIP2_INCLUDE_DIR}/bzlib.h" BZLIB_H REGEX "bzip2/libbzip2 version [0-9]+\\.[^ ]+ of [0-9]+ ")
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STRING(REGEX REPLACE ".* bzip2/libbzip2 version ([0-9]+\\.[^ ]+) of [0-9]+ .*" "\\1" BZIP2_VERSION_STRING "${BZLIB_H}")
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ENDIF (BZIP2_INCLUDE_DIR AND EXISTS "${BZIP2_INCLUDE_DIR}/bzlib.h")
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2012-08-13 17:42:58 +00:00
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# handle the QUIETLY and REQUIRED arguments and set BZip2_FOUND to TRUE if
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2007-07-18 17:56:45 +00:00
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# all listed variables are TRUE
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Modules: Include builtin FindPackageHandleStandardArgs directly
The FindPackageHandleStandardArgs module was originally created outside
of CMake. It was added for CMake 2.6.0 by commit e118a627 (add a macro
FIND_PACKAGE_HANDLE_STANDARD_ARGS..., 2007-07-18). However, it also
proliferated into a number of other projects that at the time required
only CMake 2.4 and thus could not depend on CMake to provide the module.
CMake's own find modules started using the module in commit b5f656e0
(use the new FIND_PACKAGE_HANDLE_STANDARD_ARGS in some of the FindXXX
modules..., 2007-07-18).
Then commit d358cf5c (add 2nd, more powerful mode to
find_package_handle_standard_args, 2010-07-29) added a new feature to
the interface of the module that was fully optional and backward
compatible with all existing users of the module. Later commit 5f183caa
(FindZLIB: use the FPHSA version mode, 2010-08-04) and others shortly
thereafter started using the new interface in CMake's own find modules.
This change was also backward compatible because it was only an
implementation detail within each module.
Unforutnately these changes introduced a problem for projects that still
have an old copy of FindPackageHandleStandardArgs in CMAKE_MODULE_PATH.
When any such project uses one of CMake's builtin find modules the line
include(FindPackageHandleStandardArgs)
loads the copy from the project which does not have the new interface!
Then the including find module tries to use the new interface with the
old module and fails.
Whether this breakage can be considered a backward incompatible change
in CMake is debatable. The situation is analagous to copying a standard
library header from one version of a compiler into a project and then
observing problems when the next version of the compiler reports errors
in its other headers that depend on its new version of the original
header. Nevertheless it is a change to CMake that causes problems for
projects that worked with previous versions.
This problem was discovered during the 2.8.3 release candidate cycle.
It is an instance of a more general problem with projects that provide
their own versions of CMake modules when other CMake modules depend on
them. At the time we resolved this instance of the problem with commit
b0118402 (Use absolute path to FindPackageHandleStandardArgs.cmake
everywhere, 2010-09-28) for the 2.8.3 release.
In order to address the more general problem we introduced policy
CMP0017 in commit db44848f (Prefer files from CMAKE_ROOT when including
from CMAKE_ROOT, 2010-11-17). That change was followed by commit
ce28737c (Remove usage of CMAKE_CURRENT_LIST_DIR now that we have
CMP0017, 2010-12-20) which reverted the original workaround in favor of
using the policy. However, existing project releases do not set the
policy behavior to NEW and therefore still exhibit the problem.
We introduced in commit a364daf1 (Allow users to specify defaults for
unset policies, 2011-01-03) an option for users to build existing
projects by adding -DCMAKE_POLICY_DEFAULT_CMP0017=NEW to the command
line. Unfortunately this solution still does not allow such projects to
build out of the box, and there is no good way to suggest the use of the
new option.
The only remaining solution to keep existing projects that exhibit this
problem building is to restore the change originally made in commit
b0118402 (Use absolute path to FindPackageHandleStandardArgs.cmake
everywhere, 2010-09-28). This also avoids policy CMP0017 warnings for
this particular instance of the problem the policy addresses.
2011-01-20 15:56:49 +00:00
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INCLUDE(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
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2012-01-10 13:00:52 +00:00
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FIND_PACKAGE_HANDLE_STANDARD_ARGS(BZip2
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REQUIRED_VARS BZIP2_LIBRARIES BZIP2_INCLUDE_DIR
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VERSION_VAR BZIP2_VERSION_STRING)
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2006-09-19 20:11:53 +00:00
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IF (BZIP2_FOUND)
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2007-07-18 17:56:45 +00:00
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INCLUDE(CheckLibraryExists)
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2012-01-10 13:12:09 +00:00
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CHECK_LIBRARY_EXISTS("${BZIP2_LIBRARIES}" BZ2_bzCompressInit "" BZIP2_NEED_PREFIX)
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2006-09-19 20:11:53 +00:00
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ENDIF (BZIP2_FOUND)
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2012-01-10 13:12:09 +00:00
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MARK_AS_ADVANCED(BZIP2_INCLUDE_DIR)
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