+
+dnl Code shared by fseeko and ftello. Determine if large files are supported,
+dnl but stdin does not start as a large file by default.
+AC_DEFUN([gl_STDIN_LARGE_OFFSET],
+ [
+ AC_CACHE_CHECK([whether stdin defaults to large file offsets],
+ [gl_cv_var_stdin_large_offset],
+ [AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>],
+[#if defined __SL64 && defined __SCLE /* cygwin */
+ /* Cygwin 1.5.24 and earlier fail to put stdin in 64-bit mode, making
+ fseeko/ftello needlessly fail. This bug was fixed at the same time
+ that cygwin started exporting asnprintf (cygwin 1.7.0), so we use
+ that as a link-time test for cross-compiles rather than building
+ a runtime test. */
+ size_t s;
+ if (asnprintf (NULL, &s, ""))
+ return 0;
+#endif])],
+ [gl_cv_var_stdin_large_offset=yes],
+ [gl_cv_var_stdin_large_offset=no])])
+])