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CMake/Modules/FindTCL.cmake
Brad King c4275592a8 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 10:56:49 -05:00

216 lines
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CMake
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# - Find Tcl includes and libraries.
# This module finds if Tcl is installed and determines where the
# include files and libraries are. It also determines what the name of
# the library is. This code sets the following variables:
# TCL_FOUND = Tcl was found
# TK_FOUND = Tk was found
# TCLTK_FOUND = Tcl and Tk were found
# TCL_LIBRARY = path to Tcl library (tcl tcl80)
# TCL_INCLUDE_PATH = path to where tcl.h can be found
# TCL_TCLSH = path to tclsh binary (tcl tcl80)
# TK_LIBRARY = path to Tk library (tk tk80 etc)
# TK_INCLUDE_PATH = path to where tk.h can be found
# TK_WISH = full path to the wish executable
#
# In an effort to remove some clutter and clear up some issues for people
# who are not necessarily Tcl/Tk gurus/developpers, some variables were
# moved or removed. Changes compared to CMake 2.4 are:
# - The stub libraries are now found in FindTclStub.cmake
# => they were only useful for people writing Tcl/Tk extensions.
# - TCL_LIBRARY_DEBUG and TK_LIBRARY_DEBUG were removed.
# => these libs are not packaged by default with Tcl/Tk distributions.
# Even when Tcl/Tk is built from source, several flavors of debug libs
# are created and there is no real reason to pick a single one
# specifically (say, amongst tcl84g, tcl84gs, or tcl84sgx).
# Let's leave that choice to the user by allowing him to assign
# TCL_LIBRARY to any Tcl library, debug or not.
# - TK_INTERNAL_PATH was removed.
# => this ended up being only a Win32 variable, and there is a lot of
# confusion regarding the location of this file in an installed Tcl/Tk
# tree anyway (see 8.5 for example). If you need the internal path at
# this point it is safer you ask directly where the *source* tree is
# and dig from there.
#=============================================================================
# Copyright 2001-2009 Kitware, Inc.
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)
INCLUDE(CMakeFindFrameworks)
INCLUDE(FindTclsh)
INCLUDE(FindWish)
GET_FILENAME_COMPONENT(TCL_TCLSH_PATH "${TCL_TCLSH}" PATH)
GET_FILENAME_COMPONENT(TCL_TCLSH_PATH_PARENT "${TCL_TCLSH_PATH}" PATH)
STRING(REGEX REPLACE
"^.*tclsh([0-9]\\.*[0-9]).*$" "\\1" TCL_TCLSH_VERSION "${TCL_TCLSH}")
GET_FILENAME_COMPONENT(TK_WISH_PATH "${TK_WISH}" PATH)
GET_FILENAME_COMPONENT(TK_WISH_PATH_PARENT "${TK_WISH_PATH}" PATH)
STRING(REGEX REPLACE
"^.*wish([0-9]\\.*[0-9]).*$" "\\1" TK_WISH_VERSION "${TK_WISH}")
GET_FILENAME_COMPONENT(TCL_INCLUDE_PATH_PARENT "${TCL_INCLUDE_PATH}" PATH)
GET_FILENAME_COMPONENT(TK_INCLUDE_PATH_PARENT "${TK_INCLUDE_PATH}" PATH)
GET_FILENAME_COMPONENT(TCL_LIBRARY_PATH "${TCL_LIBRARY}" PATH)
GET_FILENAME_COMPONENT(TCL_LIBRARY_PATH_PARENT "${TCL_LIBRARY_PATH}" PATH)
STRING(REGEX REPLACE
"^.*tcl([0-9]\\.*[0-9]).*$" "\\1" TCL_LIBRARY_VERSION "${TCL_LIBRARY}")
GET_FILENAME_COMPONENT(TK_LIBRARY_PATH "${TK_LIBRARY}" PATH)
GET_FILENAME_COMPONENT(TK_LIBRARY_PATH_PARENT "${TK_LIBRARY_PATH}" PATH)
STRING(REGEX REPLACE
"^.*tk([0-9]\\.*[0-9]).*$" "\\1" TK_LIBRARY_VERSION "${TK_LIBRARY}")
SET(TCLTK_POSSIBLE_LIB_PATHS
"${TCL_INCLUDE_PATH_PARENT}/lib"
"${TK_INCLUDE_PATH_PARENT}/lib"
"${TCL_LIBRARY_PATH}"
"${TK_LIBRARY_PATH}"
"${TCL_TCLSH_PATH_PARENT}/lib"
"${TK_WISH_PATH_PARENT}/lib"
/usr/lib
/usr/local/lib
)
IF(WIN32)
GET_FILENAME_COMPONENT(
ActiveTcl_CurrentVersion
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\ActiveState\\ActiveTcl;CurrentVersion]"
NAME)
SET(TCLTK_POSSIBLE_LIB_PATHS ${TCLTK_POSSIBLE_LIB_PATHS}
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\ActiveState\\ActiveTcl\\${ActiveTcl_CurrentVersion}]/lib"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\Scriptics\\Tcl\\8.6;Root]/lib"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\Scriptics\\Tcl\\8.5;Root]/lib"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\Scriptics\\Tcl\\8.4;Root]/lib"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\Scriptics\\Tcl\\8.3;Root]/lib"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\Scriptics\\Tcl\\8.2;Root]/lib"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\Scriptics\\Tcl\\8.0;Root]/lib"
"$ENV{ProgramFiles}/Tcl/Lib"
"C:/Program Files/Tcl/lib"
"C:/Tcl/lib"
)
ENDIF(WIN32)
FIND_LIBRARY(TCL_LIBRARY
NAMES
tcl
tcl${TCL_LIBRARY_VERSION} tcl${TCL_TCLSH_VERSION} tcl${TK_WISH_VERSION}
tcl86 tcl8.6
tcl85 tcl8.5
tcl84 tcl8.4
tcl83 tcl8.3
tcl82 tcl8.2
tcl80 tcl8.0
PATHS ${TCLTK_POSSIBLE_LIB_PATHS}
)
FIND_LIBRARY(TK_LIBRARY
NAMES
tk
tk${TK_LIBRARY_VERSION} tk${TCL_TCLSH_VERSION} tk${TK_WISH_VERSION}
tk86 tk8.6
tk85 tk8.5
tk84 tk8.4
tk83 tk8.3
tk82 tk8.2
tk80 tk8.0
PATHS ${TCLTK_POSSIBLE_LIB_PATHS}
)
CMAKE_FIND_FRAMEWORKS(Tcl)
CMAKE_FIND_FRAMEWORKS(Tk)
SET(TCL_FRAMEWORK_INCLUDES)
IF(Tcl_FRAMEWORKS)
IF(NOT TCL_INCLUDE_PATH)
FOREACH(dir ${Tcl_FRAMEWORKS})
SET(TCL_FRAMEWORK_INCLUDES ${TCL_FRAMEWORK_INCLUDES} ${dir}/Headers)
ENDFOREACH(dir)
ENDIF(NOT TCL_INCLUDE_PATH)
ENDIF(Tcl_FRAMEWORKS)
SET(TK_FRAMEWORK_INCLUDES)
IF(Tk_FRAMEWORKS)
IF(NOT TK_INCLUDE_PATH)
FOREACH(dir ${Tk_FRAMEWORKS})
SET(TK_FRAMEWORK_INCLUDES ${TK_FRAMEWORK_INCLUDES}
${dir}/Headers ${dir}/PrivateHeaders)
ENDFOREACH(dir)
ENDIF(NOT TK_INCLUDE_PATH)
ENDIF(Tk_FRAMEWORKS)
SET(TCLTK_POSSIBLE_INCLUDE_PATHS
"${TCL_LIBRARY_PATH_PARENT}/include"
"${TK_LIBRARY_PATH_PARENT}/include"
"${TCL_INCLUDE_PATH}"
"${TK_INCLUDE_PATH}"
${TCL_FRAMEWORK_INCLUDES}
${TK_FRAMEWORK_INCLUDES}
"${TCL_TCLSH_PATH_PARENT}/include"
"${TK_WISH_PATH_PARENT}/include"
/usr/include
/usr/local/include
/usr/include/tcl${TK_LIBRARY_VERSION}
/usr/include/tcl${TCL_LIBRARY_VERSION}
/usr/include/tcl8.6
/usr/include/tcl8.5
/usr/include/tcl8.4
/usr/include/tcl8.3
/usr/include/tcl8.2
/usr/include/tcl8.0
)
IF(WIN32)
SET(TCLTK_POSSIBLE_INCLUDE_PATHS ${TCLTK_POSSIBLE_INCLUDE_PATHS}
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\ActiveState\\ActiveTcl\\${ActiveTcl_CurrentVersion}]/include"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\Scriptics\\Tcl\\8.6;Root]/include"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\Scriptics\\Tcl\\8.5;Root]/include"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\Scriptics\\Tcl\\8.4;Root]/include"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\Scriptics\\Tcl\\8.3;Root]/include"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\Scriptics\\Tcl\\8.2;Root]/include"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\Scriptics\\Tcl\\8.0;Root]/include"
"$ENV{ProgramFiles}/Tcl/include"
"C:/Program Files/Tcl/include"
"C:/Tcl/include"
)
ENDIF(WIN32)
FIND_PATH(TCL_INCLUDE_PATH
NAMES tcl.h
HINTS ${TCLTK_POSSIBLE_INCLUDE_PATHS}
)
FIND_PATH(TK_INCLUDE_PATH
NAMES tk.h
HINTS ${TCLTK_POSSIBLE_INCLUDE_PATHS}
)
# handle the QUIETLY and REQUIRED arguments and set TCL_FOUND to TRUE if
# all listed variables are TRUE
INCLUDE(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(TCL DEFAULT_MSG TCL_LIBRARY TCL_INCLUDE_PATH)
SET(TCLTK_FIND_REQUIRED ${TCL_FIND_REQUIRED})
SET(TCLTK_FIND_QUIETLY ${TCL_FIND_QUIETLY})
FIND_PACKAGE_HANDLE_STANDARD_ARGS(TCLTK DEFAULT_MSG TCL_LIBRARY TCL_INCLUDE_PATH TK_LIBRARY TK_INCLUDE_PATH)
SET(TK_FIND_REQUIRED ${TCL_FIND_REQUIRED})
SET(TK_FIND_QUIETLY ${TCL_FIND_QUIETLY})
FIND_PACKAGE_HANDLE_STANDARD_ARGS(TK DEFAULT_MSG TK_LIBRARY TK_INCLUDE_PATH)
MARK_AS_ADVANCED(
TCL_INCLUDE_PATH
TK_INCLUDE_PATH
TCL_LIBRARY
TK_LIBRARY
)
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