| # Copyright (c) 2014 Alexander Lamaison <alexander.lamaison@gmail.com> |
| # |
| # 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 the copyright holder nor the names |
| # of any other 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. |
| |
| |
| # - check_function_exists_maybe_need_library(<function> <var> [lib1 ... libn]) |
| # |
| # Check if function is available for linking, first without extra libraries, and |
| # then, if not found that way, linking in each optional library as well. This |
| # function is similar to autotools AC_SEARCH_LIBS. |
| # |
| # If the function if found, this will define <var>. |
| # |
| # If the function was only found by linking in an additional library, this |
| # will define NEED_LIB_LIBX, where LIBX is the one of lib1 to libn that |
| # makes the function available, in uppercase. |
| # |
| # The following variables may be set before calling this macro to |
| # modify the way the check is run: |
| # |
| # CMAKE_REQUIRED_FLAGS = string of compile command line flags |
| # CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar) |
| # CMAKE_REQUIRED_INCLUDES = list of include directories |
| # CMAKE_REQUIRED_LIBRARIES = list of libraries to link |
| # |
| |
| include(CheckFunctionExists) |
| include(CheckLibraryExists) |
| |
| function(check_function_exists_may_need_library function variable) |
| |
| check_function_exists(${function} ${variable}) |
| |
| if(NOT ${variable}) |
| foreach(lib ${ARGN}) |
| string(TOUPPER ${lib} UP_LIB) |
| # Use new variable to prevent cache from previous step shortcircuiting |
| # new test |
| check_library_exists(${lib} ${function} "" HAVE_${function}_IN_${lib}) |
| if(HAVE_${function}_IN_${lib}) |
| set(${variable} 1 CACHE INTERNAL |
| "Function ${function} found in library ${lib}") |
| set(NEED_LIB_${UP_LIB} 1 CACHE INTERNAL |
| "Need to link ${lib}") |
| break() |
| endif() |
| endforeach() |
| endif() |
| |
| endfunction() |