582 lines
26 KiB
CMake
582 lines
26 KiB
CMake
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# Ceres Solver - A fast non-linear least squares minimizer
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# Copyright 2015 Google Inc. All rights reserved.
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# http://ceres-solver.org/
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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# * Neither the name of Google Inc. nor the names of its contributors may be
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# used to endorse or promote products derived from this software without
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# specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# Author: alexs.mac@gmail.com (Alex Stewart)
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#
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# FindGflags.cmake - Find Google gflags logging library.
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#
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# This module will attempt to find gflags, either via an exported CMake
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# configuration (generated by gflags >= 2.1 which are built with CMake), or
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# by performing a standard search for all gflags components. The order of
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# precedence for these two methods of finding gflags is controlled by:
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# GFLAGS_PREFER_EXPORTED_GFLAGS_CMAKE_CONFIGURATION.
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#
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# This module defines the following variables:
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#
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# GFLAGS_FOUND: TRUE iff gflags is found.
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# GFLAGS_INCLUDE_DIRS: Include directories for gflags.
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# GFLAGS_LIBRARIES: Libraries required to link gflags.
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# GFLAGS_NAMESPACE: The namespace in which gflags is defined. In versions of
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# gflags < 2.1, this was google, for versions >= 2.1 it is
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# by default gflags, although can be configured when building
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# gflags to be something else (i.e. google for legacy
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# compatibility).
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#
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# The following variables control the behaviour of this module when an exported
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# gflags CMake configuration is not found.
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#
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# GFLAGS_PREFER_EXPORTED_GFLAGS_CMAKE_CONFIGURATION: TRUE/FALSE, iff TRUE then
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# then prefer using an exported CMake configuration
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# generated by gflags >= 2.1 over searching for the
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# gflags components manually. Otherwise (FALSE)
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# ignore any exported gflags CMake configurations and
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# always perform a manual search for the components.
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# Default: TRUE iff user does not define this variable
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# before we are called, and does NOT specify either
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# GFLAGS_INCLUDE_DIR_HINTS or GFLAGS_LIBRARY_DIR_HINTS
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# otherwise FALSE.
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# GFLAGS_INCLUDE_DIR_HINTS: List of additional directories in which to
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# search for gflags includes, e.g: /timbuktu/include.
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# GFLAGS_LIBRARY_DIR_HINTS: List of additional directories in which to
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# search for gflags libraries, e.g: /timbuktu/lib.
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#
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# The following variables are also defined by this module, but in line with
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# CMake recommended FindPackage() module style should NOT be referenced directly
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# by callers (use the plural variables detailed above instead). These variables
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# do however affect the behaviour of the module via FIND_[PATH/LIBRARY]() which
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# are NOT re-called (i.e. search for library is not repeated) if these variables
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# are set with valid values _in the CMake cache_. This means that if these
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# variables are set directly in the cache, either by the user in the CMake GUI,
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# or by the user passing -DVAR=VALUE directives to CMake when called (which
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# explicitly defines a cache variable), then they will be used verbatim,
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# bypassing the HINTS variables and other hard-coded search locations.
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#
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# GFLAGS_INCLUDE_DIR: Include directory for gflags, not including the
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# include directory of any dependencies.
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# GFLAGS_LIBRARY: gflags library, not including the libraries of any
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# dependencies.
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# Reset CALLERS_CMAKE_FIND_LIBRARY_PREFIXES to its value when FindGflags was
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# invoked, necessary for MSVC.
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macro(GFLAGS_RESET_FIND_LIBRARY_PREFIX)
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if (MSVC)
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set(CMAKE_FIND_LIBRARY_PREFIXES "${CALLERS_CMAKE_FIND_LIBRARY_PREFIXES}")
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endif (MSVC)
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endmacro(GFLAGS_RESET_FIND_LIBRARY_PREFIX)
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# Called if we failed to find gflags or any of it's required dependencies,
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# unsets all public (designed to be used externally) variables and reports
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# error message at priority depending upon [REQUIRED/QUIET/<NONE>] argument.
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macro(GFLAGS_REPORT_NOT_FOUND REASON_MSG)
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unset(GFLAGS_FOUND)
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unset(GFLAGS_INCLUDE_DIRS)
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unset(GFLAGS_LIBRARIES)
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# Do not use unset, as we want to keep GFLAGS_NAMESPACE in the cache,
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# but simply clear its value.
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set(GFLAGS_NAMESPACE "" CACHE STRING
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"gflags namespace (google or gflags)" FORCE)
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# Make results of search visible in the CMake GUI if gflags has not
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# been found so that user does not have to toggle to advanced view.
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mark_as_advanced(CLEAR GFLAGS_INCLUDE_DIR
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GFLAGS_LIBRARY
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GFLAGS_NAMESPACE)
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gflags_reset_find_library_prefix()
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# Note <package>_FIND_[REQUIRED/QUIETLY] variables defined by FindPackage()
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# use the camelcase library name, not uppercase.
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if (Gflags_FIND_QUIETLY)
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message(STATUS "Failed to find gflags - " ${REASON_MSG} ${ARGN})
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elseif (Gflags_FIND_REQUIRED)
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message(FATAL_ERROR "Failed to find gflags - " ${REASON_MSG} ${ARGN})
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else()
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# Neither QUIETLY nor REQUIRED, use no priority which emits a message
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# but continues configuration and allows generation.
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message("-- Failed to find gflags - " ${REASON_MSG} ${ARGN})
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endif ()
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endmacro(GFLAGS_REPORT_NOT_FOUND)
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# Verify that all variable names passed as arguments are defined (can be empty
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# but must be defined) or raise a fatal error.
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macro(GFLAGS_CHECK_VARS_DEFINED)
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foreach(CHECK_VAR ${ARGN})
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if (NOT DEFINED ${CHECK_VAR})
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message(FATAL_ERROR "Ceres Bug: ${CHECK_VAR} is not defined.")
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endif()
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endforeach()
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endmacro(GFLAGS_CHECK_VARS_DEFINED)
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# Use check_cxx_source_compiles() to compile trivial test programs to determine
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# the gflags namespace. This works on all OSs except Windows. If using Visual
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# Studio, it fails because msbuild forces check_cxx_source_compiles() to use
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# CMAKE_BUILD_TYPE=Debug for the test project, which usually breaks detection
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# because MSVC requires that the test project use the same build type as gflags,
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# which would normally be built in Release.
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#
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# Defines: GFLAGS_NAMESPACE in the caller's scope with the detected namespace,
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# which is blank (empty string, will test FALSE is CMake conditionals)
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# if detection failed.
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function(GFLAGS_CHECK_GFLAGS_NAMESPACE_USING_TRY_COMPILE)
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# Verify that all required variables are defined.
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gflags_check_vars_defined(
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GFLAGS_INCLUDE_DIR GFLAGS_LIBRARY)
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# Ensure that GFLAGS_NAMESPACE is always unset on completion unless
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# we explicitly set if after having the correct namespace.
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set(GFLAGS_NAMESPACE "" PARENT_SCOPE)
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include(CheckCXXSourceCompiles)
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# Setup include path & link library for gflags for CHECK_CXX_SOURCE_COMPILES.
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set(CMAKE_REQUIRED_INCLUDES ${GFLAGS_INCLUDE_DIR})
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set(CMAKE_REQUIRED_LIBRARIES ${GFLAGS_LIBRARY} ${GFLAGS_LINK_LIBRARIES})
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# First try the (older) google namespace. Note that the output variable
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# MUST be unique to the build type as otherwise the test is not repeated as
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# it is assumed to have already been performed.
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check_cxx_source_compiles(
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"#include <gflags/gflags.h>
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int main(int argc, char * argv[]) {
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google::ParseCommandLineFlags(&argc, &argv, true);
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return 0;
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}"
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GFLAGS_IN_GOOGLE_NAMESPACE)
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if (GFLAGS_IN_GOOGLE_NAMESPACE)
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set(GFLAGS_NAMESPACE google PARENT_SCOPE)
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return()
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endif()
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# Try (newer) gflags namespace instead. Note that the output variable
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# MUST be unique to the build type as otherwise the test is not repeated as
|
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# it is assumed to have already been performed.
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set(CMAKE_REQUIRED_INCLUDES ${GFLAGS_INCLUDE_DIR})
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set(CMAKE_REQUIRED_LIBRARIES ${GFLAGS_LIBRARY} ${GFLAGS_LINK_LIBRARIES})
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check_cxx_source_compiles(
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"#include <gflags/gflags.h>
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int main(int argc, char * argv[]) {
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gflags::ParseCommandLineFlags(&argc, &argv, true);
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return 0;
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}"
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GFLAGS_IN_GFLAGS_NAMESPACE)
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if (GFLAGS_IN_GFLAGS_NAMESPACE)
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set(GFLAGS_NAMESPACE gflags PARENT_SCOPE)
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return()
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endif (GFLAGS_IN_GFLAGS_NAMESPACE)
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endfunction(GFLAGS_CHECK_GFLAGS_NAMESPACE_USING_TRY_COMPILE)
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# Use regex on the gflags headers to attempt to determine the gflags namespace.
|
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# Checks both gflags.h (contained namespace on versions < 2.1.2) and
|
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# gflags_declare.h, which contains the namespace on versions >= 2.1.2.
|
||
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|
# In general, this method should only be used when
|
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# GFLAGS_CHECK_GFLAGS_NAMESPACE_USING_TRY_COMPILE() cannot be used, or has
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# failed.
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#
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# Defines: GFLAGS_NAMESPACE in the caller's scope with the detected namespace,
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# which is blank (empty string, will test FALSE is CMake conditionals)
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# if detection failed.
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function(GFLAGS_CHECK_GFLAGS_NAMESPACE_USING_REGEX)
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# Verify that all required variables are defined.
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gflags_check_vars_defined(GFLAGS_INCLUDE_DIR)
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# Ensure that GFLAGS_NAMESPACE is always undefined on completion unless
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# we explicitly set if after having the correct namespace.
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set(GFLAGS_NAMESPACE "" PARENT_SCOPE)
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# Scan gflags.h to identify what namespace gflags was built with. On
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# versions of gflags < 2.1.2, gflags.h was configured with the namespace
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# directly, on >= 2.1.2, gflags.h uses the GFLAGS_NAMESPACE #define which
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# is defined in gflags_declare.h, we try each location in turn.
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set(GFLAGS_HEADER_FILE ${GFLAGS_INCLUDE_DIR}/gflags/gflags.h)
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if (NOT EXISTS ${GFLAGS_HEADER_FILE})
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gflags_report_not_found(
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"Could not find file: ${GFLAGS_HEADER_FILE} "
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"containing namespace information in gflags install located at: "
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"${GFLAGS_INCLUDE_DIR}.")
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endif()
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file(READ ${GFLAGS_HEADER_FILE} GFLAGS_HEADER_FILE_CONTENTS)
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string(REGEX MATCH "namespace [A-Za-z]+"
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GFLAGS_NAMESPACE "${GFLAGS_HEADER_FILE_CONTENTS}")
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string(REGEX REPLACE "namespace ([A-Za-z]+)" "\\1"
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GFLAGS_NAMESPACE "${GFLAGS_NAMESPACE}")
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if (NOT GFLAGS_NAMESPACE)
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gflags_report_not_found(
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"Failed to extract gflags namespace from header file: "
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"${GFLAGS_HEADER_FILE}.")
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endif (NOT GFLAGS_NAMESPACE)
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if (GFLAGS_NAMESPACE STREQUAL "google" OR
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GFLAGS_NAMESPACE STREQUAL "gflags")
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# Found valid gflags namespace from gflags.h.
|
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set(GFLAGS_NAMESPACE "${GFLAGS_NAMESPACE}" PARENT_SCOPE)
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return()
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endif()
|
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||
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# Failed to find gflags namespace from gflags.h, gflags is likely a new
|
||
|
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# version, check gflags_declare.h, which in newer versions (>= 2.1.2) contains
|
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# the GFLAGS_NAMESPACE #define, which is then referenced in gflags.h.
|
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set(GFLAGS_DECLARE_FILE ${GFLAGS_INCLUDE_DIR}/gflags/gflags_declare.h)
|
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if (NOT EXISTS ${GFLAGS_DECLARE_FILE})
|
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gflags_report_not_found(
|
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"Could not find file: ${GFLAGS_DECLARE_FILE} "
|
||
|
|
"containing namespace information in gflags install located at: "
|
||
|
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"${GFLAGS_INCLUDE_DIR}.")
|
||
|
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endif()
|
||
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file(READ ${GFLAGS_DECLARE_FILE} GFLAGS_DECLARE_FILE_CONTENTS)
|
||
|
|
|
||
|
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string(REGEX MATCH "#define GFLAGS_NAMESPACE [A-Za-z]+"
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||
|
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GFLAGS_NAMESPACE "${GFLAGS_DECLARE_FILE_CONTENTS}")
|
||
|
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string(REGEX REPLACE "#define GFLAGS_NAMESPACE ([A-Za-z]+)" "\\1"
|
||
|
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GFLAGS_NAMESPACE "${GFLAGS_NAMESPACE}")
|
||
|
|
|
||
|
|
if (NOT GFLAGS_NAMESPACE)
|
||
|
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gflags_report_not_found(
|
||
|
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"Failed to extract gflags namespace from declare file: "
|
||
|
|
"${GFLAGS_DECLARE_FILE}.")
|
||
|
|
endif (NOT GFLAGS_NAMESPACE)
|
||
|
|
|
||
|
|
if (GFLAGS_NAMESPACE STREQUAL "google" OR
|
||
|
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GFLAGS_NAMESPACE STREQUAL "gflags")
|
||
|
|
# Found valid gflags namespace from gflags.h.
|
||
|
|
set(GFLAGS_NAMESPACE "${GFLAGS_NAMESPACE}" PARENT_SCOPE)
|
||
|
|
return()
|
||
|
|
endif()
|
||
|
|
endfunction(GFLAGS_CHECK_GFLAGS_NAMESPACE_USING_REGEX)
|
||
|
|
|
||
|
|
# -----------------------------------------------------------------
|
||
|
|
# By default, if the user has expressed no preference for using an exported
|
||
|
|
# gflags CMake configuration over performing a search for the installed
|
||
|
|
# components, and has not specified any hints for the search locations, then
|
||
|
|
# prefer a gflags exported configuration if available.
|
||
|
|
if (NOT DEFINED GFLAGS_PREFER_EXPORTED_GFLAGS_CMAKE_CONFIGURATION
|
||
|
|
AND NOT GFLAGS_INCLUDE_DIR_HINTS
|
||
|
|
AND NOT GFLAGS_LIBRARY_DIR_HINTS)
|
||
|
|
message(STATUS "No preference for use of exported gflags CMake configuration "
|
||
|
|
"set, and no hints for include/library directories provided. "
|
||
|
|
"Defaulting to preferring an installed/exported gflags CMake configuration "
|
||
|
|
"if available.")
|
||
|
|
set(GFLAGS_PREFER_EXPORTED_GFLAGS_CMAKE_CONFIGURATION TRUE)
|
||
|
|
endif()
|
||
|
|
|
||
|
|
if (GFLAGS_PREFER_EXPORTED_GFLAGS_CMAKE_CONFIGURATION)
|
||
|
|
# Try to find an exported CMake configuration for gflags, as generated by
|
||
|
|
# gflags versions >= 2.1.
|
||
|
|
#
|
||
|
|
# We search twice, s/t we can invert the ordering of precedence used by
|
||
|
|
# find_package() for exported package build directories, and installed
|
||
|
|
# packages (found via CMAKE_SYSTEM_PREFIX_PATH), listed as items 6) and 7)
|
||
|
|
# respectively in [1].
|
||
|
|
#
|
||
|
|
# By default, exported build directories are (in theory) detected first, and
|
||
|
|
# this is usually the case on Windows. However, on OS X & Linux, the install
|
||
|
|
# path (/usr/local) is typically present in the PATH environment variable
|
||
|
|
# which is checked in item 4) in [1] (i.e. before both of the above, unless
|
||
|
|
# NO_SYSTEM_ENVIRONMENT_PATH is passed). As such on those OSs installed
|
||
|
|
# packages are usually detected in preference to exported package build
|
||
|
|
# directories.
|
||
|
|
#
|
||
|
|
# To ensure a more consistent response across all OSs, and as users usually
|
||
|
|
# want to prefer an installed version of a package over a locally built one
|
||
|
|
# where both exist (esp. as the exported build directory might be removed
|
||
|
|
# after installation), we first search with NO_CMAKE_PACKAGE_REGISTRY which
|
||
|
|
# means any build directories exported by the user are ignored, and thus
|
||
|
|
# installed directories are preferred. If this fails to find the package
|
||
|
|
# we then research again, but without NO_CMAKE_PACKAGE_REGISTRY, so any
|
||
|
|
# exported build directories will now be detected.
|
||
|
|
#
|
||
|
|
# To prevent confusion on Windows, we also pass NO_CMAKE_BUILDS_PATH (which
|
||
|
|
# is item 5) in [1]), to not preferentially use projects that were built
|
||
|
|
# recently with the CMake GUI to ensure that we always prefer an installed
|
||
|
|
# version if available.
|
||
|
|
#
|
||
|
|
# [1] http://www.cmake.org/cmake/help/v2.8.11/cmake.html#command:find_package
|
||
|
|
find_package(gflags QUIET
|
||
|
|
NO_MODULE
|
||
|
|
NO_CMAKE_PACKAGE_REGISTRY
|
||
|
|
NO_CMAKE_BUILDS_PATH)
|
||
|
|
if (gflags_FOUND)
|
||
|
|
message(STATUS "Found installed version of gflags: ${gflags_DIR}")
|
||
|
|
else(gflags_FOUND)
|
||
|
|
# Failed to find an installed version of gflags, repeat search allowing
|
||
|
|
# exported build directories.
|
||
|
|
message(STATUS "Failed to find installed gflags CMake configuration, "
|
||
|
|
"searching for gflags build directories exported with CMake.")
|
||
|
|
# Again pass NO_CMAKE_BUILDS_PATH, as we know that gflags is exported and
|
||
|
|
# do not want to treat projects built with the CMake GUI preferentially.
|
||
|
|
find_package(gflags QUIET
|
||
|
|
NO_MODULE
|
||
|
|
NO_CMAKE_BUILDS_PATH)
|
||
|
|
if (gflags_FOUND)
|
||
|
|
message(STATUS "Found exported gflags build directory: ${gflags_DIR}")
|
||
|
|
endif(gflags_FOUND)
|
||
|
|
endif(gflags_FOUND)
|
||
|
|
|
||
|
|
set(FOUND_INSTALLED_GFLAGS_CMAKE_CONFIGURATION ${gflags_FOUND})
|
||
|
|
|
||
|
|
# gflags v2.1 - 2.1.2 shipped with a bug in their gflags-config.cmake [1]
|
||
|
|
# whereby gflags_LIBRARIES = "gflags", but there was no imported target
|
||
|
|
# called "gflags", they were called: gflags[_nothreads]-[static/shared].
|
||
|
|
# As this causes linker errors when gflags is not installed in a location
|
||
|
|
# on the current library paths, detect if this problem is present and
|
||
|
|
# fix it.
|
||
|
|
#
|
||
|
|
# [1] https://github.com/gflags/gflags/issues/110
|
||
|
|
if (gflags_FOUND)
|
||
|
|
# NOTE: This is not written as additional conditions in the outer
|
||
|
|
# if (gflags_FOUND) as the NOT TARGET "${gflags_LIBRARIES}"
|
||
|
|
# condition causes problems if gflags is not found.
|
||
|
|
if (${gflags_VERSION} VERSION_LESS 2.1.3 AND
|
||
|
|
NOT TARGET "${gflags_LIBRARIES}")
|
||
|
|
message(STATUS "Detected broken gflags install in: ${gflags_DIR}, "
|
||
|
|
"version: ${gflags_VERSION} <= 2.1.2 which defines gflags_LIBRARIES = "
|
||
|
|
"${gflags_LIBRARIES} which is not an imported CMake target, see: "
|
||
|
|
"https://github.com/gflags/gflags/issues/110. Attempting to fix by "
|
||
|
|
"detecting correct gflags target.")
|
||
|
|
# Ordering here expresses preference for detection, specifically we do not
|
||
|
|
# want to use the _nothreads variants if the full library is available.
|
||
|
|
list(APPEND CHECK_GFLAGS_IMPORTED_TARGET_NAMES
|
||
|
|
gflags-shared gflags-static
|
||
|
|
gflags_nothreads-shared gflags_nothreads-static)
|
||
|
|
foreach(CHECK_GFLAGS_TARGET ${CHECK_GFLAGS_IMPORTED_TARGET_NAMES})
|
||
|
|
if (TARGET ${CHECK_GFLAGS_TARGET})
|
||
|
|
message(STATUS "Found valid gflags target: ${CHECK_GFLAGS_TARGET}, "
|
||
|
|
"updating gflags_LIBRARIES.")
|
||
|
|
set(gflags_LIBRARIES ${CHECK_GFLAGS_TARGET})
|
||
|
|
break()
|
||
|
|
endif()
|
||
|
|
endforeach()
|
||
|
|
if (NOT TARGET ${gflags_LIBRARIES})
|
||
|
|
message(STATUS "Failed to fix detected broken gflags install in: "
|
||
|
|
"${gflags_DIR}, version: ${gflags_VERSION} <= 2.1.2, none of the "
|
||
|
|
"imported targets for gflags: ${CHECK_GFLAGS_IMPORTED_TARGET_NAMES} "
|
||
|
|
"are defined. Will continue with a manual search for gflags "
|
||
|
|
"components. We recommend you build/install a version of gflags > "
|
||
|
|
"2.1.2 (or master).")
|
||
|
|
set(FOUND_INSTALLED_GFLAGS_CMAKE_CONFIGURATION FALSE)
|
||
|
|
endif()
|
||
|
|
endif()
|
||
|
|
endif()
|
||
|
|
|
||
|
|
if (FOUND_INSTALLED_GFLAGS_CMAKE_CONFIGURATION)
|
||
|
|
message(STATUS "Detected gflags version: ${gflags_VERSION}")
|
||
|
|
set(GFLAGS_FOUND ${gflags_FOUND})
|
||
|
|
set(GFLAGS_INCLUDE_DIR ${gflags_INCLUDE_DIR})
|
||
|
|
set(GFLAGS_LIBRARY ${gflags_LIBRARIES})
|
||
|
|
|
||
|
|
# gflags does not export the namespace in their CMake configuration, so
|
||
|
|
# use our function to determine what it should be, as it can be either
|
||
|
|
# gflags or google dependent upon version & configuration.
|
||
|
|
#
|
||
|
|
# NOTE: We use the regex method to determine the namespace here, as
|
||
|
|
# check_cxx_source_compiles() will not use imported targets, which
|
||
|
|
# is what gflags will be in this case.
|
||
|
|
gflags_check_gflags_namespace_using_regex()
|
||
|
|
|
||
|
|
if (NOT GFLAGS_NAMESPACE)
|
||
|
|
gflags_report_not_found(
|
||
|
|
"Failed to determine gflags namespace using regex for gflags "
|
||
|
|
"version: ${gflags_VERSION} exported here: ${gflags_DIR} using CMake.")
|
||
|
|
endif (NOT GFLAGS_NAMESPACE)
|
||
|
|
else (FOUND_INSTALLED_GFLAGS_CMAKE_CONFIGURATION)
|
||
|
|
message(STATUS "Failed to find an installed/exported CMake configuration "
|
||
|
|
"for gflags, will perform search for installed gflags components.")
|
||
|
|
endif (FOUND_INSTALLED_GFLAGS_CMAKE_CONFIGURATION)
|
||
|
|
endif(GFLAGS_PREFER_EXPORTED_GFLAGS_CMAKE_CONFIGURATION)
|
||
|
|
|
||
|
|
if (NOT GFLAGS_FOUND)
|
||
|
|
# Either failed to find an exported gflags CMake configuration, or user
|
||
|
|
# told us not to use one. Perform a manual search for all gflags components.
|
||
|
|
|
||
|
|
# Handle possible presence of lib prefix for libraries on MSVC, see
|
||
|
|
# also GFLAGS_RESET_FIND_LIBRARY_PREFIX().
|
||
|
|
if (MSVC)
|
||
|
|
# Preserve the caller's original values for CMAKE_FIND_LIBRARY_PREFIXES
|
||
|
|
# s/t we can set it back before returning.
|
||
|
|
set(CALLERS_CMAKE_FIND_LIBRARY_PREFIXES "${CMAKE_FIND_LIBRARY_PREFIXES}")
|
||
|
|
# The empty string in this list is important, it represents the case when
|
||
|
|
# the libraries have no prefix (shared libraries / DLLs).
|
||
|
|
set(CMAKE_FIND_LIBRARY_PREFIXES "lib" "" "${CMAKE_FIND_LIBRARY_PREFIXES}")
|
||
|
|
endif (MSVC)
|
||
|
|
|
||
|
|
# Search user-installed locations first, so that we prefer user installs
|
||
|
|
# to system installs where both exist.
|
||
|
|
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_PATH_SUFFIXES
|
||
|
|
gflags/include # Windows (for C:/Program Files prefix).
|
||
|
|
gflags/Include ) # Windows (for C:/Program Files prefix).
|
||
|
|
|
||
|
|
list(APPEND GFLAGS_CHECK_LIBRARY_DIRS
|
||
|
|
/usr/local/lib
|
||
|
|
/usr/local/homebrew/lib # Mac OS X.
|
||
|
|
/opt/local/lib
|
||
|
|
/usr/lib)
|
||
|
|
list(APPEND GFLAGS_CHECK_LIBRARY_SUFFIXES
|
||
|
|
gflags/lib # Windows (for C:/Program Files prefix).
|
||
|
|
gflags/Lib ) # Windows (for C:/Program Files prefix).
|
||
|
|
|
||
|
|
# Search supplied hint directories first if supplied.
|
||
|
|
find_path(GFLAGS_INCLUDE_DIR
|
||
|
|
NAMES gflags/gflags.h
|
||
|
|
PATHS ${GFLAGS_INCLUDE_DIR_HINTS}
|
||
|
|
${GFLAGS_CHECK_INCLUDE_DIRS}
|
||
|
|
PATH_SUFFIXES ${GFLAGS_CHECK_PATH_SUFFIXES})
|
||
|
|
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_DIR_HINTS}
|
||
|
|
${GFLAGS_CHECK_LIBRARY_DIRS}
|
||
|
|
PATH_SUFFIXES ${GFLAGS_CHECK_LIBRARY_SUFFIXES})
|
||
|
|
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})
|
||
|
|
|
||
|
|
# gflags typically requires a threading library (which is OS dependent), note
|
||
|
|
# that this defines the CMAKE_THREAD_LIBS_INIT variable. If we are able to
|
||
|
|
# detect threads, we assume that gflags requires it.
|
||
|
|
find_package(Threads QUIET)
|
||
|
|
set(GFLAGS_LINK_LIBRARIES ${CMAKE_THREAD_LIBS_INIT})
|
||
|
|
# On Windows (including MinGW), the Shlwapi library is used by gflags if
|
||
|
|
# available.
|
||
|
|
if (WIN32)
|
||
|
|
include(CheckIncludeFileCXX)
|
||
|
|
check_include_file_cxx("shlwapi.h" HAVE_SHLWAPI)
|
||
|
|
if (HAVE_SHLWAPI)
|
||
|
|
list(APPEND GFLAGS_LINK_LIBRARIES shlwapi.lib)
|
||
|
|
endif(HAVE_SHLWAPI)
|
||
|
|
endif (WIN32)
|
||
|
|
|
||
|
|
# Mark internally as found, then verify. GFLAGS_REPORT_NOT_FOUND() unsets
|
||
|
|
# if called.
|
||
|
|
set(GFLAGS_FOUND TRUE)
|
||
|
|
|
||
|
|
# Identify what namespace gflags was built with.
|
||
|
|
if (GFLAGS_INCLUDE_DIR AND NOT GFLAGS_NAMESPACE)
|
||
|
|
# To handle Windows peculiarities / CMake bugs on MSVC we try two approaches
|
||
|
|
# to detect the gflags namespace:
|
||
|
|
#
|
||
|
|
# 1) Try to use check_cxx_source_compiles() to compile a trivial program
|
||
|
|
# with the two choices for the gflags namespace.
|
||
|
|
#
|
||
|
|
# 2) [In the event 1) fails] Use regex on the gflags headers to try to
|
||
|
|
# determine the gflags namespace. Whilst this is less robust than 1),
|
||
|
|
# it does avoid any interaction with msbuild.
|
||
|
|
gflags_check_gflags_namespace_using_try_compile()
|
||
|
|
|
||
|
|
if (NOT GFLAGS_NAMESPACE)
|
||
|
|
# Failed to determine gflags namespace using check_cxx_source_compiles()
|
||
|
|
# method, try and obtain it using regex on the gflags headers instead.
|
||
|
|
message(STATUS "Failed to find gflags namespace using using "
|
||
|
|
"check_cxx_source_compiles(), trying namespace regex instead, "
|
||
|
|
"this is expected on Windows.")
|
||
|
|
gflags_check_gflags_namespace_using_regex()
|
||
|
|
|
||
|
|
if (NOT GFLAGS_NAMESPACE)
|
||
|
|
gflags_report_not_found(
|
||
|
|
"Failed to determine gflags namespace either by "
|
||
|
|
"check_cxx_source_compiles(), or namespace regex.")
|
||
|
|
endif (NOT GFLAGS_NAMESPACE)
|
||
|
|
endif (NOT GFLAGS_NAMESPACE)
|
||
|
|
endif (GFLAGS_INCLUDE_DIR AND NOT GFLAGS_NAMESPACE)
|
||
|
|
|
||
|
|
# Make the GFLAGS_NAMESPACE a cache variable s/t the user can view it, and could
|
||
|
|
# overwrite it in the CMake GUI.
|
||
|
|
set(GFLAGS_NAMESPACE "${GFLAGS_NAMESPACE}" CACHE STRING
|
||
|
|
"gflags namespace (google or gflags)" FORCE)
|
||
|
|
|
||
|
|
# 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_NAMESPACE in the cache / GUI
|
||
|
|
# with an invalid value.
|
||
|
|
if (GFLAGS_NAMESPACE AND
|
||
|
|
NOT GFLAGS_NAMESPACE STREQUAL "google" AND
|
||
|
|
NOT GFLAGS_NAMESPACE STREQUAL "gflags")
|
||
|
|
gflags_report_not_found(
|
||
|
|
"Caller defined GFLAGS_NAMESPACE:"
|
||
|
|
" ${GFLAGS_NAMESPACE} is not valid, not google or gflags.")
|
||
|
|
endif ()
|
||
|
|
# 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[^/]*")
|
||
|
|
|
||
|
|
gflags_reset_find_library_prefix()
|
||
|
|
|
||
|
|
endif(NOT GFLAGS_FOUND)
|
||
|
|
|
||
|
|
# Set standard CMake FindPackage variables if found.
|
||
|
|
if (GFLAGS_FOUND)
|
||
|
|
set(GFLAGS_INCLUDE_DIRS ${GFLAGS_INCLUDE_DIR})
|
||
|
|
set(GFLAGS_LIBRARIES ${GFLAGS_LIBRARY} ${GFLAGS_LINK_LIBRARIES})
|
||
|
|
endif (GFLAGS_FOUND)
|
||
|
|
|
||
|
|
# Handle REQUIRED / QUIET optional arguments.
|
||
|
|
include(FindPackageHandleStandardArgs)
|
||
|
|
find_package_handle_standard_args(Gflags DEFAULT_MSG
|
||
|
|
GFLAGS_INCLUDE_DIRS GFLAGS_LIBRARIES GFLAGS_NAMESPACE)
|
||
|
|
|
||
|
|
# 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
|
||
|
|
GFLAGS_NAMESPACE
|
||
|
|
gflags_DIR) # Autogenerated by find_package(gflags)
|
||
|
|
endif (GFLAGS_FOUND)
|