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CMake/Modules/FindQt.cmake
Brad King 86578eccf2 Simplify CMake per-source license notices 
Per-source copyright/license notice headers that spell out copyright holder
names and years are hard to maintain and often out-of-date or plain wrong.
Precise contributor information is already maintained automatically by the
version control tool.  Ultimately it is the receiver of a file who is
responsible for determining its licensing status, and per-source notices are
merely a convenience.  Therefore it is simpler and more accurate for
each source to have a generic notice of the license name and references to
more detailed information on copyright holders and full license terms.

Our `Copyright.txt` file now contains a list of Contributors whose names
appeared source-level copyright notices.  It also references version control
history for more precise information.  Therefore we no longer need to spell
out the list of Contributors in each source file notice.

Replace CMake per-source copyright/license notice headers with a short
description of the license and links to `Copyright.txt` and online information
available from "https://cmake.org/licensing".  The online URL also handles
cases of modules being copied out of our source into other projects, so we
can drop our notices about replacing links with full license text.

Run the `Utilities/Scripts/filter-notices.bash` script to perform the majority
of the replacements mechanically.  Manually fix up shebang lines and trailing
newlines in a few files.  Manually update the notices in a few files that the
script does not handle.
2016-09-27 15:14:44 -04:00

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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
#.rst:
# FindQt
# ------
#
# Searches for all installed versions of Qt.
#
# This should only be used if your project can work with multiple
# versions of Qt. If not, you should just directly use FindQt4 or
# FindQt3. If multiple versions of Qt are found on the machine, then
# The user must set the option DESIRED_QT_VERSION to the version they
# want to use. If only one version of qt is found on the machine, then
# the DESIRED_QT_VERSION is set to that version and the matching FindQt3
# or FindQt4 module is included. Once the user sets DESIRED_QT_VERSION,
# then the FindQt3 or FindQt4 module is included.
#
# This module can only detect and switch between Qt versions 3 and 4. It
# cannot handle Qt5 or any later versions.
#
# ::
#
# QT_REQUIRED if this is set to TRUE then if CMake can
# not find Qt4 or Qt3 an error is raised
# and a message is sent to the user.
#
#
#
# ::
#
# DESIRED_QT_VERSION OPTION is created
# QT4_INSTALLED is set to TRUE if qt4 is found.
# QT3_INSTALLED is set to TRUE if qt3 is found.
# look for signs of qt3 installations
file(GLOB GLOB_TEMP_VAR /usr/lib*/qt-3*/bin/qmake /usr/lib*/qt3*/bin/qmake)
if(GLOB_TEMP_VAR)
set(QT3_INSTALLED TRUE)
endif()
set(GLOB_TEMP_VAR)
file(GLOB GLOB_TEMP_VAR /usr/local/qt-x11-commercial-3*/bin/qmake)
if(GLOB_TEMP_VAR)
set(QT3_INSTALLED TRUE)
endif()
set(GLOB_TEMP_VAR)
file(GLOB GLOB_TEMP_VAR /usr/local/lib/qt3/bin/qmake)
if(GLOB_TEMP_VAR)
set(QT3_INSTALLED TRUE)
endif()
set(GLOB_TEMP_VAR)
# look for qt4 installations
file(GLOB GLOB_TEMP_VAR /usr/local/qt-x11-commercial-4*/bin/qmake)
if(GLOB_TEMP_VAR)
set(QT4_INSTALLED TRUE)
endif()
set(GLOB_TEMP_VAR)
file(GLOB GLOB_TEMP_VAR /usr/local/Trolltech/Qt-4*/bin/qmake)
if(GLOB_TEMP_VAR)
set(QT4_INSTALLED TRUE)
endif()
set(GLOB_TEMP_VAR)
file(GLOB GLOB_TEMP_VAR /usr/local/lib/qt4/bin/qmake)
if(GLOB_TEMP_VAR)
set(QT4_INSTALLED TRUE)
endif()
set(GLOB_TEMP_VAR)
if (Qt_FIND_VERSION)
if (Qt_FIND_VERSION MATCHES "^([34])(\\.[0-9]+.*)?$")
set(DESIRED_QT_VERSION ${CMAKE_MATCH_1})
else ()
message(FATAL_ERROR "FindQt was called with invalid version '${Qt_FIND_VERSION}'. Only Qt major versions 3 or 4 are supported. If you do not need to support both Qt3 and Qt4 in your source consider calling find_package(Qt3) or find_package(Qt4) instead of find_package(Qt) instead.")
endif ()
endif ()
# now find qmake
find_program(QT_QMAKE_EXECUTABLE_FINDQT NAMES qmake PATHS "${QT_SEARCH_PATH}/bin" "$ENV{QTDIR}/bin")
if(QT_QMAKE_EXECUTABLE_FINDQT)
exec_program(${QT_QMAKE_EXECUTABLE_FINDQT} ARGS "-query QT_VERSION"
OUTPUT_VARIABLE QTVERSION)
if(QTVERSION MATCHES "4")
set(QT_QMAKE_EXECUTABLE ${QT_QMAKE_EXECUTABLE_FINDQT} CACHE PATH "Qt4 qmake program.")
set(QT4_INSTALLED TRUE)
endif()
if(QTVERSION MATCHES "Unknown")
set(QT3_INSTALLED TRUE)
endif()
endif()
if(QT_QMAKE_EXECUTABLE_FINDQT)
exec_program( ${QT_QMAKE_EXECUTABLE_FINDQT}
ARGS "-query QT_INSTALL_HEADERS"
OUTPUT_VARIABLE qt_headers )
endif()
find_file( QT4_QGLOBAL_H_FILE qglobal.h
"${QT_SEARCH_PATH}/Qt/include"
"[HKEY_CURRENT_USER\\Software\\Trolltech\\Qt3Versions\\4.0.0;InstallDir]/include/Qt"
"[HKEY_CURRENT_USER\\Software\\Trolltech\\Versions\\4.0.0;InstallDir]/include/Qt"
${qt_headers}/Qt
$ENV{QTDIR}/include/Qt
/usr/local/qt/include/Qt
/usr/local/include/Qt
/usr/lib/qt/include/Qt
/usr/include/Qt
/usr/share/qt4/include/Qt
/usr/local/include/X11/qt4/Qt
C:/Progra~1/qt/include/Qt )
if(QT4_QGLOBAL_H_FILE)
set(QT4_INSTALLED TRUE)
endif()
find_file( QT3_QGLOBAL_H_FILE qglobal.h
"${QT_SEARCH_PATH}/Qt/include"
"[HKEY_CURRENT_USER\\Software\\Trolltech\\Qt3Versions\\3.2.1;InstallDir]/include/Qt"
"[HKEY_CURRENT_USER\\Software\\Trolltech\\Qt3Versions\\3.2.0;InstallDir]/include/Qt"
"[HKEY_CURRENT_USER\\Software\\Trolltech\\Qt3Versions\\3.1.0;InstallDir]/include/Qt"
C:/Qt/3.3.3Educational/include
$ENV{QTDIR}/include
/usr/include/qt3/Qt
/usr/local/qt/include
/usr/local/include
/usr/lib/qt/include
/usr/include
/usr/share/qt3/include
/usr/local/include/X11/qt3
C:/Progra~1/qt/include
/usr/include/qt3 )
if(QT3_QGLOBAL_H_FILE)
set(QT3_INSTALLED TRUE)
endif()
if(QT3_INSTALLED AND QT4_INSTALLED AND NOT DESIRED_QT_VERSION)
# force user to pick if we have both
set(DESIRED_QT_VERSION 0 CACHE STRING "Pick a version of Qt to use: 3 or 4")
else()
# if only one found then pick that one
if(QT3_INSTALLED AND NOT DESIRED_QT_VERSION EQUAL 4)
set(DESIRED_QT_VERSION 3 CACHE STRING "Pick a version of Qt to use: 3 or 4")
endif()
if(QT4_INSTALLED AND NOT DESIRED_QT_VERSION EQUAL 3)
set(DESIRED_QT_VERSION 4 CACHE STRING "Pick a version of Qt to use: 3 or 4")
endif()
endif()
if(DESIRED_QT_VERSION EQUAL 3)
set(Qt3_FIND_REQUIRED ${Qt_FIND_REQUIRED})
set(Qt3_FIND_QUIETLY ${Qt_FIND_QUIETLY})
include(${CMAKE_CURRENT_LIST_DIR}/FindQt3.cmake)
endif()
if(DESIRED_QT_VERSION EQUAL 4)
set(Qt4_FIND_REQUIRED ${Qt_FIND_REQUIRED})
set(Qt4_FIND_QUIETLY ${Qt_FIND_QUIETLY})
include(${CMAKE_CURRENT_LIST_DIR}/FindQt4.cmake)
endif()
if(NOT QT3_INSTALLED AND NOT QT4_INSTALLED)
if(QT_REQUIRED)
message(SEND_ERROR "CMake was unable to find any Qt versions, put qmake in your path, or set QT_QMAKE_EXECUTABLE.")
endif()
else()
if(NOT QT_FOUND AND NOT DESIRED_QT_VERSION)
if(QT_REQUIRED)
message(SEND_ERROR "Multiple versions of Qt found please set DESIRED_QT_VERSION")
else()
message("Multiple versions of Qt found please set DESIRED_QT_VERSION")
endif()
endif()
if(NOT QT_FOUND AND DESIRED_QT_VERSION)
if(QT_REQUIRED)
message(FATAL_ERROR "CMake was unable to find Qt version: ${DESIRED_QT_VERSION}. Set advanced values QT_QMAKE_EXECUTABLE and QT${DESIRED_QT_VERSION}_QGLOBAL_H_FILE, if those are set then QT_QT_LIBRARY or QT_LIBRARY_DIR.")
else()
message( "CMake was unable to find desired Qt version: ${DESIRED_QT_VERSION}. Set advanced values QT_QMAKE_EXECUTABLE and QT${DESIRED_QT_VERSION}_QGLOBAL_H_FILE.")
endif()
endif()
endif()
mark_as_advanced(QT3_QGLOBAL_H_FILE QT4_QGLOBAL_H_FILE QT_QMAKE_EXECUTABLE_FINDQT)
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