Enable large file support

2 files changed, 48 insertions, 0 deletions

diff --git a/cmake/CheckFileOffsetBits.c b/cmake/CheckFileOffsetBits.c
new file mode 100644
index 00000000..de98296e
--- /dev/null
+++ b/cmake/CheckFileOffsetBits.c
@@ -0,0 +1,9 @@
+#include <sys/types.h>
+
+#define KB ((off_t)(1024))
+#define MB ((off_t)(KB*1024))
+#define GB ((off_t)(MB*1024))
+int tb[((GB+GB+GB) > GB) ? 1 : -1];
+
+int main()
+{ return 0; }
diff --git a/cmake/CheckFileOffsetBits.cmake b/cmake/CheckFileOffsetBits.cmake
new file mode 100644
index 00000000..8b549b69
--- /dev/null
+++ b/cmake/CheckFileOffsetBits.cmake
@@ -0,0 +1,39 @@
+# - Check if the _FILE_OFFSET_BITS macro is needed for large files
+# CHECK_FILE_OFFSET_BITS()
+#
+# The following variables may be set before calling this macro to
+# modify the way the check is run:
+#
+#  CMAKE_REQUIRED_FLAGS = string of compile command line flags
+#  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
+#  CMAKE_REQUIRED_INCLUDES = list of include directories
+# Copyright (c) 2009, Chris Robinson
+#
+# Redistribution and use is allowed according to the terms of the LGPL license.
+
+
+MACRO(CHECK_FILE_OFFSET_BITS)
+
+  IF(NOT DEFINED _FILE_OFFSET_BITS)
+    MESSAGE(STATUS "Checking _FILE_OFFSET_BITS for large files")
+    TRY_COMPILE(__WITHOUT_FILE_OFFSET_BITS_64
+      ${CMAKE_BINARY_DIR}
+      ${CMAKE_SOURCE_DIR}/cmake/CheckFileOffsetBits.c
+      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS})
+    IF(NOT __WITHOUT_FILE_OFFSET_BITS_64)
+      TRY_COMPILE(__WITH_FILE_OFFSET_BITS_64
+        ${CMAKE_BINARY_DIR}
+        ${CMAKE_SOURCE_DIR}/cmake/CheckFileOffsetBits.c
+        COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -D_FILE_OFFSET_BITS=64)
+    ENDIF(NOT __WITHOUT_FILE_OFFSET_BITS_64)
+
+    IF(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64)
+      SET(_FILE_OFFSET_BITS 64 CACHE INTERNAL "_FILE_OFFSET_BITS macro needed for large files")
+      MESSAGE(STATUS "Checking _FILE_OFFSET_BITS for large files - 64")
+    ELSE(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64)
+      SET(_FILE_OFFSET_BITS "" CACHE INTERNAL "_FILE_OFFSET_BITS macro needed for large files")
+      MESSAGE(STATUS "Checking _FILE_OFFSET_BITS for large files - not needed")
+    ENDIF(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64)
+  ENDIF(NOT DEFINED _FILE_OFFSET_BITS)
+
+ENDMACRO(CHECK_FILE_OFFSET_BITS)
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