From 1cbd49e61b022970dc7a24fefd6a6f8fba69eac5 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?J=C3=B6rg=20Mayer?= Date: Tue, 23 Jul 2013 09:40:21 +0000 Subject: Copy over cmake largfile detection from the gromacs project. svn path=/trunk/; revision=50824 --- cmake/modules/gmxTestLargeFiles.cmake | 125 ++++++++++++++++++++++++++++++++++ 1 file changed, 125 insertions(+) create mode 100644 cmake/modules/gmxTestLargeFiles.cmake (limited to 'cmake/modules') diff --git a/cmake/modules/gmxTestLargeFiles.cmake b/cmake/modules/gmxTestLargeFiles.cmake new file mode 100644 index 0000000000..e7593e9924 --- /dev/null +++ b/cmake/modules/gmxTestLargeFiles.cmake @@ -0,0 +1,125 @@ +# This code was copied from http://www.gromacs.org/ +# and its toplevel COPYING file starts with: +# +# GROMACS is free software, distributed under the GNU General Public License +# (GPL) Version 2. + +# - Define macro to check large file support +# +# GMX_TEST_LARGE_FILES(VARIABLE) +# +# VARIABLE will be set to true if off_t is 64 bits, and fseeko/ftello present. +# This macro will also set defines necessary enable large file support, for instance +# _LARGE_FILES +# _LARGEFILE_SOURCE +# _FILE_OFFSET_BITS 64 +# +# However, it is YOUR job to make sure these defines are set in a cmakedefine so they +# end up in a config.h file that is included in your source if necessary! + +MACRO(GMX_TEST_LARGE_FILES VARIABLE) + IF(NOT DEFINED ${VARIABLE}) + + # On most platforms it is probably overkill to first test the flags for 64-bit off_t, + # and then separately fseeko. However, in the future we might have 128-bit filesystems + # (ZFS), so it might be dangerous to indiscriminately set e.g. _FILE_OFFSET_BITS=64. + + MESSAGE(STATUS "Checking for 64-bit off_t") + + # First check without any special flags + TRY_COMPILE(FILE64_OK "${CMAKE_BINARY_DIR}" + "${CMAKE_SOURCE_DIR}/cmake/TestFileOffsetBits.c") + if(FILE64_OK) + MESSAGE(STATUS "Checking for 64-bit off_t - present") + endif(FILE64_OK) + + if(NOT FILE64_OK) + # Test with _FILE_OFFSET_BITS=64 + TRY_COMPILE(FILE64_OK "${CMAKE_BINARY_DIR}" + "${CMAKE_SOURCE_DIR}/cmake/TestFileOffsetBits.c" + COMPILE_DEFINITIONS "-D_FILE_OFFSET_BITS=64" ) + if(FILE64_OK) + MESSAGE(STATUS "Checking for 64-bit off_t - present with _FILE_OFFSET_BITS=64") + set(_FILE_OFFSET_BITS 64 CACHE INTERNAL "64-bit off_t requires _FILE_OFFSET_BITS=64") + endif(FILE64_OK) + endif(NOT FILE64_OK) + + if(NOT FILE64_OK) + # Test with _LARGE_FILES + TRY_COMPILE(FILE64_OK "${CMAKE_BINARY_DIR}" + "${CMAKE_SOURCE_DIR}/cmake/TestFileOffsetBits.c" + COMPILE_DEFINITIONS "-D_LARGE_FILES" ) + if(FILE64_OK) + MESSAGE(STATUS "Checking for 64-bit off_t - present with _LARGE_FILES") + set(_LARGE_FILES 1 CACHE INTERNAL "64-bit off_t requires _LARGE_FILES") + endif(FILE64_OK) + endif(NOT FILE64_OK) + + if(NOT FILE64_OK) + # Test with _LARGEFILE_SOURCE + TRY_COMPILE(FILE64_OK "${CMAKE_BINARY_DIR}" + "${CMAKE_SOURCE_DIR}/cmake/TestFileOffsetBits.c" + COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE" ) + if(FILE64_OK) + MESSAGE(STATUS "Checking for 64-bit off_t - present with _LARGEFILE_SOURCE") + set(_LARGEFILE_SOURCE 1 CACHE INTERNAL "64-bit off_t requires _LARGEFILE_SOURCE") + endif(FILE64_OK) + endif(NOT FILE64_OK) + + if(NOT FILE64_OK) + # now check for Windows stuff + TRY_COMPILE(FILE64_OK "${CMAKE_BINARY_DIR}" + "${CMAKE_SOURCE_DIR}/cmake/TestWindowsFSeek.c") + if(FILE64_OK) + MESSAGE(STATUS "Checking for 64-bit off_t - present with _fseeki64") + set(HAVE__FSEEKI64 1 CACHE INTERNAL "64-bit off_t requires _fseeki64") + endif(FILE64_OK) + endif(NOT FILE64_OK) + + if(NOT FILE64_OK) + MESSAGE(STATUS "Checking for 64-bit off_t - not present") + else(NOT FILE64_OK) + + # Set the flags we might have determined to be required above + configure_file("${CMAKE_SOURCE_DIR}/cmake/TestLargeFiles.c.cmakein" + "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c") + + MESSAGE(STATUS "Checking for fseeko/ftello") + # Test if ftello/fseeko are available + TRY_COMPILE(FSEEKO_COMPILE_OK "${CMAKE_BINARY_DIR}" + "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c") + if(FSEEKO_COMPILE_OK) + MESSAGE(STATUS "Checking for fseeko/ftello - present") + endif(FSEEKO_COMPILE_OK) + + if(NOT FSEEKO_COMPILE_OK) + # glibc 2.2 neds _LARGEFILE_SOURCE for fseeko (but not 64-bit off_t...) + TRY_COMPILE(FSEEKO_COMPILE_OK "${CMAKE_BINARY_DIR}" + "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c" + COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE" ) + if(FSEEKO_COMPILE_OK) + MESSAGE(STATUS "Checking for fseeko/ftello - present with _LARGEFILE_SOURCE") + set(_LARGEFILE_SOURCE 1 CACHE INTERNAL "64-bit fseeko requires _LARGEFILE_SOURCE") + endif(FSEEKO_COMPILE_OK) + endif(NOT FSEEKO_COMPILE_OK) + + endif(NOT FILE64_OK) + + if(FSEEKO_COMPILE_OK) + SET(${VARIABLE} 1 CACHE INTERNAL "Result of test for large file support" FORCE) + set(HAVE_FSEEKO 1 CACHE INTERNAL "64bit fseeko is available" FORCE) + else(FSEEKO_COMPILE_OK) + if (HAVE__FSEEKI64) + SET(${VARIABLE} 1 CACHE INTERNAL "Result of test for large file support" FORCE) + SET(HAVE__FSEEKI64 1 CACHE INTERNAL "Windows 64-bit fseek" FORCE) + else (HAVE__FSEEKI64) + MESSAGE(STATUS "Checking for fseeko/ftello - not found") + SET(${VARIABLE} 0 CACHE INTERNAL "Result of test for large file support" FORCE) + endif (HAVE__FSEEKI64) + endif(FSEEKO_COMPILE_OK) + + ENDIF(NOT DEFINED ${VARIABLE}) +ENDMACRO(GMX_TEST_LARGE_FILES VARIABLE) + + + -- cgit v1.2.1