forked from osmocom/wireshark
154 lines
6.1 KiB
CMake
154 lines
6.1 KiB
CMake
# CMake support for large files
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#
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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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# LFS_DEFINITIONS - List of definitions to pass to add_definitions()
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# LFS_COMPILE_OPTIONS - List of definitions to pass to add_compile_options()
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# LFS_LIBRARIES - List of libraries and linker flags
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# LFS_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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# Test program to check for LFS. Requires that off_t has at least 8 byte large
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set(_lfs_test_source
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"
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#include <sys/types.h>
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typedef char my_static_assert[sizeof(off_t) >= 8 ? 1 : -1];
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int main(void) { return 0; }
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"
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)
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# Check if the given options are needed
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#
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# This appends to the variables _lfs_cppflags, _lfs_cflags, and _lfs_ldflags,
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# it also sets LFS_FOUND to 1 if it works.
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function(_lfs_check_compiler_option var options definitions libraries)
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cmake_push_check_state()
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set(CMAKE_REQUIRED_QUIET 1)
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set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS} ${options})
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set(CMAKE_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} ${definitions})
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set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_DEFINITIONS} ${libraries})
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message(STATUS "Looking for LFS support using ${options} ${definitions} ${libraries}")
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check_c_source_compiles("${_lfs_test_source}" ${var})
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cmake_pop_check_state()
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if(${var})
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message(STATUS "Looking for LFS support using ${options} ${definitions} ${libraries} - found")
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set(_lfs_cppflags ${_lfs_cppflags} ${definitions} PARENT_SCOPE)
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set(_lfs_cflags ${_lfs_cflags} ${options} PARENT_SCOPE)
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set(_lfs_ldflags ${_lfs_ldflags} ${libraries} PARENT_SCOPE)
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set(LFS_FOUND TRUE PARENT_SCOPE)
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else()
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message(STATUS "Looking for LFS support using ${options} ${definitions} ${libraries} - not found")
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endif()
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endfunction()
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# Check for the availability of LFS.
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# The cases handled are:
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#
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# * Native LFS
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# * Output of getconf LFS_CFLAGS; getconf LFS_LIBS; getconf LFS_LDFLAGS
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# * Preprocessor flag -D_FILE_OFFSET_BITS=64
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# * Preprocessor flag -D_LARGE_FILES
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#
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function(_lfs_check)
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set(_lfs_cflags)
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set(_lfs_cppflags)
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set(_lfs_ldflags)
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set(_lfs_libs)
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cmake_push_check_state()
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set(CMAKE_REQUIRED_QUIET 1)
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message(STATUS "Looking for native LFS support")
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check_c_source_compiles("${_lfs_test_source}" lfs_native)
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cmake_pop_check_state()
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if (lfs_native)
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message(STATUS "Looking for native LFS support - found")
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set(LFS_FOUND TRUE)
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else()
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message(STATUS "Looking for native LFS support - not found")
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endif()
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if (NOT LFS_FOUND)
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# Check using getconf. If getconf fails, don't worry, the check in
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# _lfs_check_compiler_option will fail as well.
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execute_process(COMMAND getconf LFS_CFLAGS
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OUTPUT_VARIABLE _lfs_cflags_raw
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OUTPUT_STRIP_TRAILING_WHITESPACE
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ERROR_QUIET)
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execute_process(COMMAND getconf LFS_LIBS
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OUTPUT_VARIABLE _lfs_libs_tmp
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OUTPUT_STRIP_TRAILING_WHITESPACE
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ERROR_QUIET)
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execute_process(COMMAND getconf LFS_LDFLAGS
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OUTPUT_VARIABLE _lfs_ldflags_tmp
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OUTPUT_STRIP_TRAILING_WHITESPACE
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ERROR_QUIET)
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separate_arguments(_lfs_cflags_raw)
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separate_arguments(_lfs_ldflags_tmp)
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separate_arguments(_lfs_libs_tmp)
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# Move -D flags to the place they are supposed to be
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foreach(flag ${_lfs_cflags_raw})
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if (flag MATCHES "-D.*")
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list(APPEND _lfs_cppflags_tmp ${flag})
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else()
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list(APPEND _lfs_cflags_tmp ${flag})
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endif()
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endforeach()
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# Check if the flags we received (if any) produce working LFS support
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_lfs_check_compiler_option(lfs_getconf_works
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"${_lfs_cflags_tmp}"
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"${_lfs_cppflags_tmp}"
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"${_lfs_libs_tmp};${_lfs_ldflags_tmp}")
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endif()
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if(NOT LFS_FOUND) # IRIX stuff
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_lfs_check_compiler_option(lfs_need_n32 "-n32" "" "")
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endif()
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if(NOT LFS_FOUND) # Linux and friends
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_lfs_check_compiler_option(lfs_need_file_offset_bits "" "-D_FILE_OFFSET_BITS=64" "")
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endif()
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if(NOT LFS_FOUND) # AIX
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_lfs_check_compiler_option(lfs_need_large_files "" "-D_LARGE_FILES=1" "")
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endif()
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set(LFS_DEFINITIONS ${_lfs_cppflags} CACHE STRING "Extra definitions for large file support")
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set(LFS_COMPILE_OPTIONS ${_lfs_cflags} CACHE STRING "Extra definitions for large file support")
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set(LFS_LIBRARIES ${_lfs_libs} ${_lfs_ldflags} CACHE STRING "Extra definitions for large file support")
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set(LFS_FOUND ${LFS_FOUND} CACHE INTERNAL "Found LFS")
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endfunction()
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if (NOT LFS_FOUND)
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_lfs_check()
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endif()
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find_package_handle_standard_args(LFS "Could not find LFS. Set LFS_DEFINITIONS, LFS_COMPILE_OPTIONS, LFS_LIBRARIES." LFS_FOUND)
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