From 0374c7f7cf3756f37db772d552e139956f26f3b2 Mon Sep 17 00:00:00 2001
From: Martin Szulecki
Date: Thu, 9 Oct 2014 16:32:14 +0200
Subject: Enable large file support if available for >2GB file support

---
 configure.ac | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 0d164e3..52cc695 100644
--- a/configure.ac
+++ b/configure.ac
@@ -46,6 +46,33 @@ AC_SUBST(GLOBAL_CFLAGS)
 AC_SUBST(AC_LDFLAGS)
 AC_SUBST(AC_LDADD)
 
+# check for large file support
+AC_SYS_LARGEFILE
+LFS_CFLAGS=''
+if test "$enable_largefile" != no; then
+	if test "$ac_cv_sys_file_offset_bits" != 'no'; then
+		LFS_CFLAGS="$LFS_CFLAGS -D_FILE_OFFSET_BITS=$ac_cv_sys_file_offset_bits"
+	else
+		AC_MSG_CHECKING(for native large file support)
+		AC_RUN_IFELSE([AC_LANG_SOURCE([#include <unistd.h>
+		  int main (int argc, char **argv)
+		  {
+		      exit(!(sizeof(off_t) == 8));
+		  }])],
+		[ac_cv_sys_file_offset_bits=64; AC_DEFINE(_FILE_OFFSET_BITS,64)
+		 AC_MSG_RESULT(yes)],
+		[AC_MSG_RESULT(no)])
+	fi
+	if test "$ac_cv_sys_large_files" != 'no'; then
+		LFS_CFLAGS="$LFS_CFLAGS -D_LARGE_FILES=1"
+	fi
+	AC_FUNC_FSEEKO
+	if test "$ac_cv_sys_largefile_source" != 'no'; then
+		LFS_CFLAGS="$LFS_CFLAGS -D_LARGEFILE_SOURCE=1"
+	fi
+fi
+AC_SUBST(LFS_CFLAGS)
+
 m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])
 
 AC_OUTPUT([
-- 
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