Set _FILE_OFFSET_BITS to 64

This allows for operating on large files when compiled in 32-bit mode.

Fixes #649.

diff --git a/cmake/config.h.in b/cmake/config.h.in
index 9e764223d6acb78f638ef6205fcca204ba98ba80..e264cfba48cc77667ece9f34c105fab1f23c8f6a 100644 (file)
--- a/cmake/config.h.in
+++ b/cmake/config.h.in
@@ -42,6 +42,11 @@
 #  define _XOPEN_SOURCE_EXTENDED
 #endif
 
+// Handle large files when compiled in 32-bit mode.
+#ifndef _FILE_OFFSET_BITS
+#  define _FILE_OFFSET_BITS 64
+#endif
+
 // clang-format off
 #cmakedefine _WIN32_WINNT @_WIN32_WINNT@
 // clang-format on