cmake/Modules/CheckLargefile.cmake

   1 # Check whether large files are supported
   2
   3 include(CheckCSourceCompiles)
   4
   5 if (UNIX OR MINGW)
   6     SET(CMAKE_REQUIRED_DEFINITIONS -Werror-implicit-function-declaration)
   7 endif()
   8 list(APPEND CMAKE_REQUIRED_DEFINITIONS -D_LARGEFILE64_SOURCE=1)
   9
  10 check_c_source_compiles("#include <fcntl.h>
  11 #include <sys/stat.h>
  12 int main()
  13 {
  14     int fd = open(\".\", O_RDONLY | O_LARGEFILE);
  15     return 0;
  16 }
  17 " HAVE_LARGEFILE_SUPPORT)
  18
  19 if (HAVE_LARGEFILE_SUPPORT)
  20     add_definitions(-DHAVE_LARGEFILE_SUPPORT=1 -D_LARGEFILE64_SOURCE=1)
  21 endif()
  22
  23 unset(CMAKE_REQUIRED_DEFINITIONS)
  24 message(STATUS "Large file support found: ${HAVE_LARGEFILE_SUPPORT}")