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86 lines
3.4 KiB
86 lines
3.4 KiB
# CMake support for fseeko
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#
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# Based on FindLFS.cmake by
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# Copyright (C) 2016 Julian Andres Klode <jak@debian.org>.
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#
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# Permission is hereby granted, free of charge, to any person
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# obtaining a copy of this software and associated documentation files
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# (the "Software"), to deal in the Software without restriction,
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# including without limitation the rights to use, copy, modify, merge,
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# publish, distribute, sublicense, and/or sell copies of the Software,
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# and to permit persons to whom the Software is furnished to do so,
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# subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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#
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# This defines the following variables
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#
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# FSEEKO_DEFINITIONS - List of definitions to pass to add_definitions()
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# FSEEKO_COMPILE_OPTIONS - List of definitions to pass to add_compile_options()
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# FSEEKO_LIBRARIES - List of libraries and linker flags
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# FSEEKO_FOUND - If there is Large files support
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#
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include(CheckCSourceCompiles)
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include(FindPackageHandleStandardArgs)
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include(CMakePushCheckState)
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# Check for the availability of fseeko()
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# The cases handled are:
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#
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# * Native fseeko()
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# * Preprocessor flag -D_LARGEFILE_SOURCE
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#
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function(_fseeko_check)
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set(_fseeko_cppflags)
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cmake_push_check_state()
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set(CMAKE_REQUIRED_QUIET 1)
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set(CMAKE_REQUIRED_DEFINITIONS ${LFS_DEFINITIONS})
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message(STATUS "Looking for native fseeko support")
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check_symbol_exists(fseeko stdio.h fseeko_native)
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cmake_pop_check_state()
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if (fseeko_native)
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message(STATUS "Looking for native fseeko support - found")
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set(FSEEKO_FOUND TRUE)
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else()
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message(STATUS "Looking for native fseeko support - not found")
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endif()
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if (NOT FSEEKO_FOUND)
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# See if it's available with _LARGEFILE_SOURCE.
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cmake_push_check_state()
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set(CMAKE_REQUIRED_QUIET 1)
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set(CMAKE_REQUIRED_DEFINITIONS ${LFS_DEFINITIONS} "-D_LARGEFILE_SOURCE")
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check_symbol_exists(fseeko stdio.h fseeko_need_largefile_source)
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cmake_pop_check_state()
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if (fseeko_need_largefile_source)
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message(STATUS "Looking for fseeko support with _LARGEFILE_SOURCE - found")
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set(FSEEKO_FOUND TRUE)
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set(_fseeko_cppflags "-D_LARGEFILE_SOURCE")
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else()
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message(STATUS "Looking for fseeko support with _LARGEFILE_SOURCE - not found")
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endif()
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endif()
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set(FSEEKO_DEFINITIONS ${_fseeko_cppflags} CACHE STRING "Extra definitions for fseeko support")
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set(FSEEKO_COMPILE_OPTIONS "" CACHE STRING "Extra compiler options for fseeko support")
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set(FSEEKO_LIBRARIES "" CACHE STRING "Extra definitions for fseeko support")
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set(FSEEKO_FOUND ${FSEEKO_FOUND} CACHE INTERNAL "Found fseeko")
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endfunction()
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if (NOT FSEEKO_FOUND)
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_fseeko_check()
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endif()
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find_package_handle_standard_args(FSEEKO "Could not find fseeko. Set FSEEKO_DEFINITIONS, FSEEKO_COMPILE_OPTIONS, FSEEKO_LIBRARIES." FSEEKO_FOUND)
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