cmake/FindGflags.cmake - ceres-solver - Git at Google

 # Ceres Solver - A fast non-linear least squares minimizer
 # Copyright 2013 Google Inc. All rights reserved.
 # http://code.google.com/p/ceres-solver/
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
 #
 # * Redistributions of source code must retain the above copyright notice,
 #   this list of conditions and the following disclaimer.
 # * Redistributions in binary form must reproduce the above copyright notice,
 #   this list of conditions and the following disclaimer in the documentation
 #   and/or other materials provided with the distribution.
 # * Neither the name of Google Inc. nor the names of its contributors may be
 #   used to endorse or promote products derived from this software without
 #   specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 # POSSIBILITY OF SUCH DAMAGE.
 #
 # Author: alexs.mac@gmail.com (Alex Stewart)
 #

 # FindGflags.cmake - Find Google gflags logging library.
 #
 # This module defines the following variables:
 #
 # GFLAGS_FOUND: TRUE iff gflags is found.
 # GFLAGS_INCLUDE_DIRS: Include directories for gflags.
 # GFLAGS_LIBRARIES: Libraries required to link gflags.
 #
 # The following variables control the behaviour of this module:
 #
 # GFLAGS_INCLUDE_DIR_HINTS: List of additional directories in which to
 #                           search for gflags includes, e.g: /timbuktu/include.
 # GFLAGS_LIBRARY_DIR_HINTS: List of additional directories in which to
 #                           search for gflags libraries, e.g: /timbuktu/lib.
 #
 # The following variables are also defined by this module, but in line with
 # CMake recommended FindPackage() module style should NOT be referenced directly
 # by callers (use the plural variables detailed above instead).  These variables
 # do however affect the behaviour of the module via FIND_[PATH/LIBRARY]() which
 # are NOT re-called (i.e. search for library is not repeated) if these variables
 # are set with valid values _in the CMake cache_. This means that if these
 # variables are set directly in the cache, either by the user in the CMake GUI,
 # or by the user passing -DVAR=VALUE directives to CMake when called (which
 # explicitly defines a cache variable), then they will be used verbatim,
 # bypassing the HINTS variables and other hard-coded search locations.
 #
 # GFLAGS_INCLUDE_DIR: Include directory for gflags, not including the
 #                     include directory of any dependencies.
 # GFLAGS_LIBRARY: gflags library, not including the libraries of any
 #                 dependencies.

 # Called if we failed to find gflags or any of it's required dependencies,
 # unsets all public (designed to be used externally) variables and reports
 # error message at priority depending upon [REQUIRED/QUIET/<NONE>] argument.
 MACRO(GFLAGS_REPORT_NOT_FOUND REASON_MSG)
   UNSET(GFLAGS_FOUND)
   UNSET(GFLAGS_INCLUDE_DIRS)
   UNSET(GFLAGS_LIBRARIES)
   # Make results of search visible in the CMake GUI if gflags has not
   # been found so that user does not have to toggle to advanced view.
   MARK_AS_ADVANCED(CLEAR GFLAGS_INCLUDE_DIR
                          GFLAGS_LIBRARY)
   # Note <package>_FIND_[REQUIRED/QUIETLY] variables defined by FindPackage()
   # use the camelcase library name, not uppercase.
   IF (Gflags_FIND_QUIETLY)
     MESSAGE(STATUS "Failed to find gflags - " ${REASON_MSG} ${ARGN})
   ELSEIF (Gflags_FIND_REQUIRED)
     MESSAGE(FATAL_ERROR "Failed to find gflags - " ${REASON_MSG} ${ARGN})
   ELSE()
     # Neither QUIETLY nor REQUIRED, use no priority which emits a message
     # but continues configuration and allows generation.
     MESSAGE("-- Failed to find gflags - " ${REASON_MSG} ${ARGN})
   ENDIF ()
 ENDMACRO(GFLAGS_REPORT_NOT_FOUND)

 # Search user-installed locations first, so that we prefer user installs
 # to system installs where both exist.
 #
 # TODO: Add standard Windows search locations for gflags.
 LIST(APPEND GFLAGS_CHECK_INCLUDE_DIRS
   /usr/local/include
   /usr/local/homebrew/include # Mac OS X
   /opt/local/var/macports/software # Mac OS X.
   /opt/local/include
   /usr/include)
 LIST(APPEND GFLAGS_CHECK_LIBRARY_DIRS
   /usr/local/lib
   /usr/local/homebrew/lib # Mac OS X.
   /opt/local/lib
   /usr/lib)

 # Search supplied hint directories first if supplied.
 FIND_PATH(GFLAGS_INCLUDE_DIR
   NAMES gflags/gflags.h
   PATHS ${GFLAGS_INCLUDE_HINTS}
   ${GFLAGS_CHECK_INCLUDE_DIRS})
 IF (NOT GFLAGS_INCLUDE_DIR OR
     NOT EXISTS ${GFLAGS_INCLUDE_DIR})
   GFLAGS_REPORT_NOT_FOUND(
     "Could not find gflags include directory, set GFLAGS_INCLUDE_DIR "
     "to directory containing gflags/gflags.h")
 ENDIF (NOT GFLAGS_INCLUDE_DIR OR
        NOT EXISTS ${GFLAGS_INCLUDE_DIR})

 FIND_LIBRARY(GFLAGS_LIBRARY NAMES gflags
   PATHS ${GFLAGS_LIBRARY_HINTS}
   ${GFLAGS_CHECK_LIBRARY_DIRS})
 IF (NOT GFLAGS_LIBRARY OR
     NOT EXISTS ${GFLAGS_LIBRARY})
   GFLAGS_REPORT_NOT_FOUND(
     "Could not find gflags library, set GFLAGS_LIBRARY "
     "to full path to libgflags.")
 ENDIF (NOT GFLAGS_LIBRARY OR
        NOT EXISTS ${GFLAGS_LIBRARY})

 # Mark internally as found, then verify. GFLAGS_REPORT_NOT_FOUND() unsets
 # if called.
 SET(GFLAGS_FOUND TRUE)

 # gflags does not seem to provide any record of the version in its
 # source tree, thus cannot extract version.

 # Catch case when caller has set GFLAGS_INCLUDE_DIR in the cache / GUI and
 # thus FIND_[PATH/LIBRARY] are not called, but specified locations are
 # invalid, otherwise we would report the library as found.
 IF (GFLAGS_INCLUDE_DIR AND
     NOT EXISTS ${GFLAGS_INCLUDE_DIR}/gflags/gflags.h)
   GFLAGS_REPORT_NOT_FOUND(
     "Caller defined GFLAGS_INCLUDE_DIR:"
     " ${GFLAGS_INCLUDE_DIR} does not contain gflags/gflags.h header.")
 ENDIF (GFLAGS_INCLUDE_DIR AND
        NOT EXISTS ${GFLAGS_INCLUDE_DIR}/gflags/gflags.h)
 # TODO: This regex for gflags library is pretty primitive, we use lowercase
 #       for comparison to handle Windows using CamelCase library names, could
 #       this check be better?
 STRING(TOLOWER "${GFLAGS_LIBRARY}" LOWERCASE_GFLAGS_LIBRARY)
 IF (GFLAGS_LIBRARY AND
     NOT "${LOWERCASE_GFLAGS_LIBRARY}" MATCHES ".*gflags[^/]*")
   GFLAGS_REPORT_NOT_FOUND(
     "Caller defined GFLAGS_LIBRARY: "
     "${GFLAGS_LIBRARY} does not match gflags.")
 ENDIF (GFLAGS_LIBRARY AND
        NOT "${LOWERCASE_GFLAGS_LIBRARY}" MATCHES ".*gflags[^/]*")

 # Set standard CMake FindPackage variables if found.
 IF (GFLAGS_FOUND)
   SET(GFLAGS_INCLUDE_DIRS ${GFLAGS_INCLUDE_DIR})
   SET(GFLAGS_LIBRARIES ${GFLAGS_LIBRARY})
 ENDIF (GFLAGS_FOUND)

 # Handle REQUIRED / QUIET optional arguments.
 INCLUDE(FindPackageHandleStandardArgs)
 FIND_PACKAGE_HANDLE_STANDARD_ARGS(Gflags DEFAULT_MSG
   GFLAGS_INCLUDE_DIRS GFLAGS_LIBRARIES)

 # Only mark internal variables as advanced if we found gflags, otherwise
 # leave them visible in the standard GUI for the user to set manually.
 IF (GFLAGS_FOUND)
   MARK_AS_ADVANCED(FORCE GFLAGS_INCLUDE_DIR
                          GFLAGS_LIBRARY)
 ENDIF (GFLAGS_FOUND)
	# Ceres Solver - A fast non-linear least squares minimizer
	# Copyright 2013 Google Inc. All rights reserved.
	# http://code.google.com/p/ceres-solver/
	#
	# Redistribution and use in source and binary forms, with or without
	# modification, are permitted provided that the following conditions are met:
	#
	# * Redistributions of source code must retain the above copyright notice,
	# this list of conditions and the following disclaimer.
	# * Redistributions in binary form must reproduce the above copyright notice,
	# this list of conditions and the following disclaimer in the documentation
	# and/or other materials provided with the distribution.
	# * Neither the name of Google Inc. nor the names of its contributors may be
	# used to endorse or promote products derived from this software without
	# specific prior written permission.
	#
	# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	# POSSIBILITY OF SUCH DAMAGE.
	#
	# Author: alexs.mac@gmail.com (Alex Stewart)
	#

	# FindGflags.cmake - Find Google gflags logging library.
	#
	# This module defines the following variables:
	#
	# GFLAGS_FOUND: TRUE iff gflags is found.
	# GFLAGS_INCLUDE_DIRS: Include directories for gflags.
	# GFLAGS_LIBRARIES: Libraries required to link gflags.
	#
	# The following variables control the behaviour of this module:
	#
	# GFLAGS_INCLUDE_DIR_HINTS: List of additional directories in which to
	# search for gflags includes, e.g: /timbuktu/include.
	# GFLAGS_LIBRARY_DIR_HINTS: List of additional directories in which to
	# search for gflags libraries, e.g: /timbuktu/lib.
	#
	# The following variables are also defined by this module, but in line with
	# CMake recommended FindPackage() module style should NOT be referenced directly
	# by callers (use the plural variables detailed above instead). These variables
	# do however affect the behaviour of the module via FIND_[PATH/LIBRARY]() which
	# are NOT re-called (i.e. search for library is not repeated) if these variables
	# are set with valid values _in the CMake cache_. This means that if these
	# variables are set directly in the cache, either by the user in the CMake GUI,
	# or by the user passing -DVAR=VALUE directives to CMake when called (which
	# explicitly defines a cache variable), then they will be used verbatim,
	# bypassing the HINTS variables and other hard-coded search locations.
	#
	# GFLAGS_INCLUDE_DIR: Include directory for gflags, not including the
	# include directory of any dependencies.
	# GFLAGS_LIBRARY: gflags library, not including the libraries of any
	# dependencies.

	# Called if we failed to find gflags or any of it's required dependencies,
	# unsets all public (designed to be used externally) variables and reports
	# error message at priority depending upon [REQUIRED/QUIET/<NONE>] argument.
	MACRO(GFLAGS_REPORT_NOT_FOUND REASON_MSG)
	UNSET(GFLAGS_FOUND)
	UNSET(GFLAGS_INCLUDE_DIRS)
	UNSET(GFLAGS_LIBRARIES)
	# Make results of search visible in the CMake GUI if gflags has not
	# been found so that user does not have to toggle to advanced view.
	MARK_AS_ADVANCED(CLEAR GFLAGS_INCLUDE_DIR
	GFLAGS_LIBRARY)
	# Note <package>_FIND_[REQUIRED/QUIETLY] variables defined by FindPackage()
	# use the camelcase library name, not uppercase.
	IF (Gflags_FIND_QUIETLY)
	MESSAGE(STATUS "Failed to find gflags - " ${REASON_MSG} ${ARGN})
	ELSEIF (Gflags_FIND_REQUIRED)
	MESSAGE(FATAL_ERROR "Failed to find gflags - " ${REASON_MSG} ${ARGN})
	ELSE()
	# Neither QUIETLY nor REQUIRED, use no priority which emits a message
	# but continues configuration and allows generation.
	MESSAGE("-- Failed to find gflags - " ${REASON_MSG} ${ARGN})
	ENDIF ()
	ENDMACRO(GFLAGS_REPORT_NOT_FOUND)

	# Search user-installed locations first, so that we prefer user installs
	# to system installs where both exist.
	#
	# TODO: Add standard Windows search locations for gflags.
	LIST(APPEND GFLAGS_CHECK_INCLUDE_DIRS
	/usr/local/include
	/usr/local/homebrew/include # Mac OS X
	/opt/local/var/macports/software # Mac OS X.
	/opt/local/include
	/usr/include)
	LIST(APPEND GFLAGS_CHECK_LIBRARY_DIRS
	/usr/local/lib
	/usr/local/homebrew/lib # Mac OS X.
	/opt/local/lib
	/usr/lib)

	# Search supplied hint directories first if supplied.
	FIND_PATH(GFLAGS_INCLUDE_DIR
	NAMES gflags/gflags.h
	PATHS ${GFLAGS_INCLUDE_HINTS}
	${GFLAGS_CHECK_INCLUDE_DIRS})
	IF (NOT GFLAGS_INCLUDE_DIR OR
	NOT EXISTS ${GFLAGS_INCLUDE_DIR})
	GFLAGS_REPORT_NOT_FOUND(
	"Could not find gflags include directory, set GFLAGS_INCLUDE_DIR "
	"to directory containing gflags/gflags.h")
	ENDIF (NOT GFLAGS_INCLUDE_DIR OR
	NOT EXISTS ${GFLAGS_INCLUDE_DIR})

	FIND_LIBRARY(GFLAGS_LIBRARY NAMES gflags
	PATHS ${GFLAGS_LIBRARY_HINTS}
	${GFLAGS_CHECK_LIBRARY_DIRS})
	IF (NOT GFLAGS_LIBRARY OR
	NOT EXISTS ${GFLAGS_LIBRARY})
	GFLAGS_REPORT_NOT_FOUND(
	"Could not find gflags library, set GFLAGS_LIBRARY "
	"to full path to libgflags.")
	ENDIF (NOT GFLAGS_LIBRARY OR
	NOT EXISTS ${GFLAGS_LIBRARY})

	# Mark internally as found, then verify. GFLAGS_REPORT_NOT_FOUND() unsets
	# if called.
	SET(GFLAGS_FOUND TRUE)

	# gflags does not seem to provide any record of the version in its
	# source tree, thus cannot extract version.

	# Catch case when caller has set GFLAGS_INCLUDE_DIR in the cache / GUI and
	# thus FIND_[PATH/LIBRARY] are not called, but specified locations are
	# invalid, otherwise we would report the library as found.
	IF (GFLAGS_INCLUDE_DIR AND
	NOT EXISTS ${GFLAGS_INCLUDE_DIR}/gflags/gflags.h)
	GFLAGS_REPORT_NOT_FOUND(
	"Caller defined GFLAGS_INCLUDE_DIR:"
	" ${GFLAGS_INCLUDE_DIR} does not contain gflags/gflags.h header.")
	ENDIF (GFLAGS_INCLUDE_DIR AND
	NOT EXISTS ${GFLAGS_INCLUDE_DIR}/gflags/gflags.h)
	# TODO: This regex for gflags library is pretty primitive, we use lowercase
	# for comparison to handle Windows using CamelCase library names, could
	# this check be better?
	STRING(TOLOWER "${GFLAGS_LIBRARY}" LOWERCASE_GFLAGS_LIBRARY)
	IF (GFLAGS_LIBRARY AND
	NOT "${LOWERCASE_GFLAGS_LIBRARY}" MATCHES ".gflags[^/]")
	GFLAGS_REPORT_NOT_FOUND(
	"Caller defined GFLAGS_LIBRARY: "
	"${GFLAGS_LIBRARY} does not match gflags.")
	ENDIF (GFLAGS_LIBRARY AND
	NOT "${LOWERCASE_GFLAGS_LIBRARY}" MATCHES ".gflags[^/]")

	# Set standard CMake FindPackage variables if found.
	IF (GFLAGS_FOUND)
	SET(GFLAGS_INCLUDE_DIRS ${GFLAGS_INCLUDE_DIR})
	SET(GFLAGS_LIBRARIES ${GFLAGS_LIBRARY})
	ENDIF (GFLAGS_FOUND)

	# Handle REQUIRED / QUIET optional arguments.
	INCLUDE(FindPackageHandleStandardArgs)
	FIND_PACKAGE_HANDLE_STANDARD_ARGS(Gflags DEFAULT_MSG
	GFLAGS_INCLUDE_DIRS GFLAGS_LIBRARIES)

	# Only mark internal variables as advanced if we found gflags, otherwise
	# leave them visible in the standard GUI for the user to set manually.
	IF (GFLAGS_FOUND)
	MARK_AS_ADVANCED(FORCE GFLAGS_INCLUDE_DIR
	GFLAGS_LIBRARY)
	ENDIF (GFLAGS_FOUND)