Cleaning up exported CeresConfig.cmake.

- Adding FindPackage scripts for all of Ceres dependencies.
- Moving depend.cmake contents to CeresConfig.cmake and cleaning up
  search for Ceres & required dependencies, no longer push Ceres
  options into client.
- Fixing uninstall to remove ceres include root directory.
- Fixing main CMakeLists to install miniglog header if enabled.
- Making miniglog library shared/static with Ceres library.

Change-Id: If926bebd11720230c5136597ccba672394ed9777
diff --git a/cmake/FindGlog.cmake b/cmake/FindGlog.cmake
new file mode 100644
index 0000000..30b95e2
--- /dev/null
+++ b/cmake/FindGlog.cmake
@@ -0,0 +1,166 @@
+# 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)
+#
+
+# FindGlog.cmake - Find Google glog logging library.
+#
+# This module defines the following variables:
+#
+# GLOG_FOUND: TRUE iff glog is found.
+# GLOG_INCLUDE_DIRS: Include directories for glog.
+# GLOG_LIBRARIES: Libraries required to link glog.
+#
+# The following variables control the behaviour of this module:
+#
+# GLOG_INCLUDE_DIRS_HINTS: List of additional directories in which to
+#                          search for glog includes, e.g: /timbuktu/include.
+# GLOG_LIBRARY_DIRS_HINTS: List of additional directories in which to
+#                          search for glog 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.
+#
+# GLOG_INCLUDE_DIR: Include directory for glog, not including the
+#                   include directory of any dependencies.
+# GLOG_LIBRARY: glog library, not including the libraries of any
+#               dependencies.
+
+# Called if we failed to find glog 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(GLOG_REPORT_NOT_FOUND REASON_MSG)
+  UNSET(GLOG_FOUND)
+  UNSET(GLOG_INCLUDE_DIRS)
+  UNSET(GLOG_LIBRARIES)
+  # Make results of search visible in the CMake GUI if glog has not
+  # been found so that user does not have to toggle to advanced view.
+  MARK_AS_ADVANCED(CLEAR GLOG_INCLUDE_DIR
+                         GLOG_LIBRARY)
+  # Note <package>_FIND_[REQUIRED/QUIETLY] variables defined by FindPackage()
+  # use the camelcase library name, not uppercase.
+  IF (Glog_FIND_QUIETLY)
+    MESSAGE(STATUS "Failed to find glog - " ${REASON_MSG} ${ARGN})
+  ELSEIF (Glog_FIND_REQUIRED)
+    MESSAGE(FATAL_ERROR "Failed to find glog - " ${REASON_MSG} ${ARGN})
+  ELSE()
+    # Neither QUIETLY nor REQUIRED, use SEND_ERROR which emits an error
+    # that prevents generation, but continues configuration.
+    MESSAGE(SEND_ERROR "Failed to find glog - " ${REASON_MSG} ${ARGN})
+  ENDIF ()
+ENDMACRO(GLOG_REPORT_NOT_FOUND)
+
+# TODO: Add standard Windows search locations for glog.
+LIST(APPEND GLOG_CHECK_INCLUDE_DIRS
+  /usr/include
+  /usr/local/include
+  /usr/local/homebrew/include # Mac OS X
+  /opt/local/var/macports/software # Mac OS X.
+  /opt/local/include)
+LIST(APPEND GLOG_CHECK_LIBRARY_DIRS
+  /usr/lib
+  /usr/local/lib
+  /usr/local/homebrew/lib # Mac OS X.
+  /opt/local/lib)
+
+# Search supplied hint directories first if supplied.
+FIND_PATH(GLOG_INCLUDE_DIR
+  NAMES glog/logging.h
+  PATHS ${GLOG_INCLUDE_DIR_HINTS}
+  ${GLOG_CHECK_INCLUDE_DIRS})
+IF (NOT GLOG_INCLUDE_DIR OR
+    NOT EXISTS ${GLOG_INCLUDE_DIR})
+  GLOG_REPORT_NOT_FOUND(
+    "Could not find glog include directory, set GLOG_INCLUDE_DIR "
+    "to directory containing glog/logging.h")
+ENDIF (NOT GLOG_INCLUDE_DIR OR
+       NOT EXISTS ${GLOG_INCLUDE_DIR})
+
+FIND_LIBRARY(GLOG_LIBRARY NAMES glog
+  PATHS ${GLOG_LIBRARY_DIR_HINTS}
+  ${GLOG_CHECK_LIBRARY_DIRS})
+IF (NOT GLOG_LIBRARY OR
+    NOT EXISTS ${GLOG_LIBRARY})
+  GLOG_REPORT_NOT_FOUND(
+    "Could not find glog library, set GLOG_LIBRARY "
+    "to full path to libglog.")
+ENDIF (NOT GLOG_LIBRARY OR
+       NOT EXISTS ${GLOG_LIBRARY})
+
+# Mark internally as found, then verify. GLOG_REPORT_NOT_FOUND() unsets
+# if called.
+SET(GLOG_FOUND TRUE)
+
+# Glog does not seem to provide any record of the version in its
+# source tree, thus cannot extract version.
+
+# Catch case when caller has set GLOG_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 (GLOG_INCLUDE_DIR AND
+    NOT EXISTS ${GLOG_INCLUDE_DIR}/glog/logging.h)
+  GLOG_REPORT_NOT_FOUND(
+    "Caller defined GLOG_INCLUDE_DIR:"
+    " ${GLOG_INCLUDE_DIR} does not contain glog/logging.h header.")
+ENDIF (GLOG_INCLUDE_DIR AND
+       NOT EXISTS ${GLOG_INCLUDE_DIR}/glog/logging.h)
+# TODO: This regex for glog library is pretty primitive, could it be better?
+IF (GLOG_LIBRARY AND
+    NOT ${GLOG_LIBRARY} MATCHES ".*glog[^/]*")
+  GLOG_REPORT_NOT_FOUND(
+    "Caller defined GLOG_LIBRARY: "
+    "${GLOG_LIBRARY} does not match glog.")
+ENDIF (GLOG_LIBRARY AND
+       NOT ${GLOG_LIBRARY} MATCHES ".*glog[^/]*")
+
+# Set standard CMake FindPackage variables if found.
+IF (GLOG_FOUND)
+  SET(GLOG_INCLUDE_DIRS ${GLOG_INCLUDE_DIR})
+  SET(GLOG_LIBRARIES ${GLOG_LIBRARY})
+ENDIF (GLOG_FOUND)
+
+# Handle REQUIRED / QUIET optional arguments.
+INCLUDE(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(Glog DEFAULT_MSG
+  GLOG_INCLUDE_DIRS GLOG_LIBRARIES)
+
+# Only mark internal variables as advanced if we found glog, otherwise
+# leave them visible in the standard GUI for the user to set manually.
+IF (GLOG_FOUND)
+  MARK_AS_ADVANCED(FORCE GLOG_INCLUDE_DIR
+                         GLOG_LIBRARY)
+ENDIF (GLOG_FOUND)