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-rw-r--r--CMakeModules/CheckLFS.cmake109
1 files changed, 109 insertions, 0 deletions
diff --git a/CMakeModules/CheckLFS.cmake b/CMakeModules/CheckLFS.cmake
new file mode 100644
index 000000000000..e2b009914387
--- /dev/null
+++ b/CMakeModules/CheckLFS.cmake
@@ -0,0 +1,109 @@
+## Checks for large file support ##
+include(CheckIncludeFile)
+include(CheckSymbolExists)
+include(CheckTypeSize)
+
+macro(check_lfs _isenable)
+ set(LFS_OFF_T "")
+ set(LFS_FOPEN "")
+ set(LFS_FSEEK "")
+ set(LFS_FTELL "")
+ set(LFS_PRID "")
+
+ if(${_isenable})
+ set(SAFE_CMAKE_REQUIRED_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS}")
+ set(CMAKE_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
+ -D_LARGEFILE_SOURCE -D_LARGE_FILES -D_FILE_OFFSET_BITS=64
+ -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS)
+
+ check_include_file("sys/types.h" HAVE_SYS_TYPES_H)
+ check_include_file("inttypes.h" HAVE_INTTYPES_H)
+ check_include_file("stddef.h" HAVE_STDDEF_H)
+ check_include_file("stdint.h" HAVE_STDINT_H)
+
+ # LFS type1: 8 <= sizeof(off_t), fseeko, ftello
+ check_type_size("off_t" SIZEOF_OFF_T)
+ if(SIZEOF_OFF_T GREATER 7)
+ check_symbol_exists("fseeko" "stdio.h" HAVE_FSEEKO)
+ check_symbol_exists("ftello" "stdio.h" HAVE_FTELLO)
+ if(HAVE_FSEEKO AND HAVE_FTELLO)
+ set(LFS_OFF_T "off_t")
+ set(LFS_FOPEN "fopen")
+ set(LFS_FSEEK "fseeko")
+ set(LFS_FTELL "ftello")
+ check_symbol_exists("PRIdMAX" "inttypes.h" HAVE_PRIDMAX)
+ if(HAVE_PRIDMAX)
+ set(LFS_PRID "PRIdMAX")
+ else(HAVE_PRIDMAX)
+ check_type_size("long" SIZEOF_LONG)
+ check_type_size("int" SIZEOF_INT)
+ if(SIZEOF_OFF_T GREATER SIZEOF_LONG)
+ set(LFS_PRID "\"lld\"")
+ elseif(SIZEOF_LONG GREATER SIZEOF_INT)
+ set(LFS_PRID "\"ld\"")
+ else(SIZEOF_OFF_T GREATER SIZEOF_LONG)
+ set(LFS_PRID "\"d\"")
+ endif(SIZEOF_OFF_T GREATER SIZEOF_LONG)
+ endif(HAVE_PRIDMAX)
+ endif(HAVE_FSEEKO AND HAVE_FTELLO)
+ endif(SIZEOF_OFF_T GREATER 7)
+
+ # LFS type2: 8 <= sizeof(off64_t), fopen64, fseeko64, ftello64
+ if(NOT LFS_OFF_T)
+ check_type_size("off64_t" SIZEOF_OFF64_T)
+ if(SIZEOF_OFF64_T GREATER 7)
+ check_symbol_exists("fopen64" "stdio.h" HAVE_FOPEN64)
+ check_symbol_exists("fseeko64" "stdio.h" HAVE_FSEEKO64)
+ check_symbol_exists("ftello64" "stdio.h" HAVE_FTELLO64)
+ if(HAVE_FOPEN64 AND HAVE_FSEEKO64 AND HAVE_FTELLO64)
+ set(LFS_OFF_T "off64_t")
+ set(LFS_FOPEN "fopen64")
+ set(LFS_FSEEK "fseeko64")
+ set(LFS_FTELL "ftello64")
+ check_symbol_exists("PRIdMAX" "inttypes.h" HAVE_PRIDMAX)
+ if(HAVE_PRIDMAX)
+ set(LFS_PRID "PRIdMAX")
+ else(HAVE_PRIDMAX)
+ check_type_size("long" SIZEOF_LONG)
+ check_type_size("int" SIZEOF_INT)
+ if(SIZEOF_OFF64_T GREATER SIZEOF_LONG)
+ set(LFS_PRID "\"lld\"")
+ elseif(SIZEOF_LONG GREATER SIZEOF_INT)
+ set(LFS_PRID "\"ld\"")
+ else(SIZEOF_OFF64_T GREATER SIZEOF_LONG)
+ set(LFS_PRID "\"d\"")
+ endif(SIZEOF_OFF64_T GREATER SIZEOF_LONG)
+ endif(HAVE_PRIDMAX)
+ endif(HAVE_FOPEN64 AND HAVE_FSEEKO64 AND HAVE_FTELLO64)
+ endif(SIZEOF_OFF64_T GREATER 7)
+ endif(NOT LFS_OFF_T)
+
+ # LFS type3: 8 <= sizeof(__int64), _fseeki64, _ftelli64
+ if(NOT LFS_OFF_T)
+ check_type_size("__int64" SIZEOF___INT64)
+ if(SIZEOF___INT64 GREATER 7)
+ check_symbol_exists("_fseeki64" "stdio.h" HAVE__FSEEKI64)
+ check_symbol_exists("_ftelli64" "stdio.h" HAVE__FTELLI64)
+ if(HAVE__FSEEKI64 AND HAVE__FTELLI64)
+ set(LFS_OFF_T "__int64")
+ set(LFS_FOPEN "fopen")
+ set(LFS_FSEEK "_fseeki64")
+ set(LFS_FTELL "_ftelli64")
+ set(LFS_PRID "\"I64d\"")
+ endif(HAVE__FSEEKI64 AND HAVE__FTELLI64)
+ endif(SIZEOF___INT64 GREATER 7)
+ endif(NOT LFS_OFF_T)
+
+ set(CMAKE_REQUIRED_DEFINITIONS "${SAFE_CMAKE_REQUIRED_DEFINITIONS}")
+ endif(${_isenable})
+
+ if(NOT LFS_OFF_T)
+ ## not found
+ set(LFS_OFF_T "long")
+ set(LFS_FOPEN "fopen")
+ set(LFS_FSEEK "fseek")
+ set(LFS_FTELL "ftell")
+ set(LFS_PRID "\"ld\"")
+ endif(NOT LFS_OFF_T)
+
+endmacro(check_lfs)