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Diffstat (limited to 'CMake/FindLFS.cmake')
| -rw-r--r-- | CMake/FindLFS.cmake | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/CMake/FindLFS.cmake b/CMake/FindLFS.cmake new file mode 100644 index 000000000..e1fcf964c --- /dev/null +++ b/CMake/FindLFS.cmake @@ -0,0 +1,148 @@ +# CMake support for large files +# +# Copyright (C) 2016 Julian Andres Klode <jak@debian.org>. +# +# Permission is hereby granted, free of charge, to any person +# obtaining a copy of this software and associated documentation files +# (the "Software"), to deal in the Software without restriction, +# including without limitation the rights to use, copy, modify, merge, +# publish, distribute, sublicense, and/or sell copies of the Software, +# and to permit persons to whom the Software is furnished to do so, +# subject to the following conditions: +# +# The above copyright notice and this permission notice shall be +# included in all copies or substantial portions of the Software. +# +# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS +# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN +# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN +# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +# SOFTWARE. +# +# This defines the following variables +# +# LFS_DEFINITIONS - List of definitions to pass to add_definitions() +# LFS_COMPILE_OPTIONS - List of definitions to pass to add_compile_options() +# LFS_LIBRARIES - List of libraries and linker flags +# LFS_FOUND - If there is Large files support +# + +include(CheckCXXSourceCompiles) +include(FindPackageHandleStandardArgs) + +# Test program to check for LFS. Requires that off_t has at least 8 byte large +set(_lfs_test_source + " + #include <sys/types.h> + typedef char my_static_assert[sizeof(off_t) >= 8 ? 1 : -1]; + int main(void) { return 0; } + " +) + +# Check if the given options are needed +# +# This appends to the variables _lfs_cppflags, _lfs_cflags, and _lfs_ldflags, +# it also sets LFS_FOUND to 1 if it works. +function(_lfs_check_compiler_option var options definitions libraries) + set(CMAKE_REQUIRED_QUIET 1) + set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS} ${options}) + set(CMAKE_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} ${definitions}) + set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_DEFINITIONS} ${libraries}) + + message(STATUS "Looking for LFS support using ${options} ${definitions} ${libraries}") + check_cxx_source_compiles("${_lfs_test_source}" ${var}) + + if(${var}) + message(STATUS "Looking for LFS support using ${options} ${definitions} ${libraries} - found") + set(_lfs_cppflags ${_lfs_cppflags} ${definitions} PARENT_SCOPE) + set(_lfs_cflags ${_lfs_cflags} ${options} PARENT_SCOPE) + set(_lfs_ldflags ${_lfs_ldflags} ${libraries} PARENT_SCOPE) + set(LFS_FOUND TRUE PARENT_SCOPE) + else() + message(STATUS "Looking for LFS support using ${options} ${definitions} ${libraries} - not found") + endif() +endfunction() + +# Check for the availability of LFS. +# The cases handled are: +# +# * Native LFS +# * Output of getconf LFS_CFLAGS; getconf LFS_LIBS; getconf LFS_LDFLAGS +# * Preprocessor flag -D_FILE_OFFSET_BITS=64 +# * Preprocessor flag -D_LARGE_FILES +# +function(_lfs_check) + set(_lfs_cflags) + set(_lfs_cppflags) + set(_lfs_ldflags) + set(_lfs_libs) + set(CMAKE_REQUIRED_QUIET 1) + message(STATUS "Looking for native LFS support") + check_cxx_source_compiles("${_lfs_test_source}" lfs_native) + if (lfs_native) + message(STATUS "Looking for native LFS support - found") + set(LFS_FOUND TRUE) + else() + message(STATUS "Looking for native LFS support - not found") + endif() + + if (NOT LFS_FOUND) + # Check using getconf. If getconf fails, don't worry, the check in + # _lfs_check_compiler_option will fail as well. + execute_process(COMMAND getconf LFS_CFLAGS + OUTPUT_VARIABLE _lfs_cflags_raw + OUTPUT_STRIP_TRAILING_WHITESPACE + ERROR_QUIET) + execute_process(COMMAND getconf LFS_LIBS + OUTPUT_VARIABLE _lfs_libs_tmp + OUTPUT_STRIP_TRAILING_WHITESPACE + ERROR_QUIET) + execute_process(COMMAND getconf LFS_LDFLAGS + OUTPUT_VARIABLE _lfs_ldflags_tmp + OUTPUT_STRIP_TRAILING_WHITESPACE + ERROR_QUIET) + + separate_arguments(_lfs_cflags_raw) + separate_arguments(_lfs_ldflags_tmp) + separate_arguments(_lfs_libs_tmp) + + # Move -D flags to the place they are supposed to be + foreach(flag ${_lfs_cflags_raw}) + if (flag MATCHES "-D.*") + list(APPEND _lfs_cppflags_tmp ${flag}) + else() + list(APPEND _lfs_cflags_tmp ${flag}) + endif() + endforeach() + + # Check if the flags we received (if any) produce working LFS support + _lfs_check_compiler_option(lfs_getconf_works + "${_lfs_cflags_tmp}" + "${_lfs_cppflags_tmp}" + "${_lfs_libs_tmp};${_lfs_ldflags_tmp}") + endif() + + if(NOT LFS_FOUND) # IRIX stuff + _lfs_check_compiler_option(lfs_need_n32 "-n32" "" "") + endif() + if(NOT LFS_FOUND) # Linux and friends + _lfs_check_compiler_option(lfs_need_file_offset_bits "" "-D_FILE_OFFSET_BITS=64" "") + endif() + if(NOT LFS_FOUND) # AIX + _lfs_check_compiler_option(lfs_need_large_files "" "-D_LARGE_FILES=1" "") + endif() + + set(LFS_DEFINITIONS ${_lfs_cppflags} CACHE STRING "Extra definitions for large file support") + set(LFS_COMPILE_OPTIONS ${_lfs_cflags} CACHE STRING "Extra definitions for large file support") + set(LFS_LIBRARIES ${_lfs_libs} ${_lfs_ldflags} CACHE STRING "Extra definitions for large file support") + set(LFS_FOUND ${LFS_FOUND} CACHE INTERNAL "Found LFS") +endfunction() + +if (NOT LFS_FOUND) + _lfs_check() +endif() + +find_package_handle_standard_args(LFS "Could not find LFS. Set LFS_DEFINITIONS, LFS_COMPILE_OPTIONS, LFS_LIBRARIES." LFS_FOUND) |