X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=m4%2Ffseeko.m4;h=6c7f551bda9c2a08f39439d524465a18a0fbd1a3;hb=bb237929fec6af7764d532c4e5348c9990f8e87e;hp=c9fbfb7fcd19fbbbc297b9b30a0e572bcbb8f881;hpb=c7e61475680fa226bd9b8bdd469cd66914e630f5;p=debian%2Fgzip

diff --git a/m4/fseeko.m4 b/m4/fseeko.m4
index c9fbfb7..6c7f551 100644
--- a/m4/fseeko.m4
+++ b/m4/fseeko.m4
@@ -1,5 +1,5 @@
-# fseeko.m4 serial 5
-dnl Copyright (C) 2007-2009 Free Software Foundation, Inc.
+# fseeko.m4 serial 17
+dnl Copyright (C) 2007-2016 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -7,30 +7,67 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_FUNC_FSEEKO],
 [
   AC_REQUIRE([gl_STDIO_H_DEFAULTS])
-  AC_REQUIRE([AC_PROG_CC])
   AC_REQUIRE([gl_STDIN_LARGE_OFFSET])
+  AC_REQUIRE([gl_SYS_TYPES_H])
+  AC_REQUIRE([AC_PROG_CC])
 
   dnl Persuade glibc <stdio.h> to declare fseeko().
   AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
 
   AC_CACHE_CHECK([for fseeko], [gl_cv_func_fseeko],
     [
-      AC_TRY_LINK([[#include <stdio.h>]], [fseeko (stdin, 0, 0);],
-	[gl_cv_func_fseeko=yes], [gl_cv_func_fseeko=no])
+      AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>
+]], [fseeko (stdin, 0, 0);])],
+        [gl_cv_func_fseeko=yes], [gl_cv_func_fseeko=no])
     ])
+
+  AC_CHECK_DECLS_ONCE([fseeko])
+  if test $ac_cv_have_decl_fseeko = no; then
+    HAVE_DECL_FSEEKO=0
+  fi
+
   if test $gl_cv_func_fseeko = no; then
     HAVE_FSEEKO=0
-    gl_REPLACE_FSEEKO
-  elif test $gl_cv_var_stdin_large_offset = no; then
-    gl_REPLACE_FSEEKO
+  else
+    if test $WINDOWS_64_BIT_OFF_T = 1; then
+      REPLACE_FSEEKO=1
+    fi
+    if test $gl_cv_var_stdin_large_offset = no; then
+      REPLACE_FSEEKO=1
+    fi
+    m4_ifdef([gl_FUNC_FFLUSH_STDIN], [
+      gl_FUNC_FFLUSH_STDIN
+      if test $gl_cv_func_fflush_stdin != yes; then
+        REPLACE_FSEEKO=1
+      fi
+    ])
   fi
 ])
 
-AC_DEFUN([gl_REPLACE_FSEEKO],
+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 in 1.5.25, and
+     it is easier to do a version check than building a runtime test.  */
+# include <cygwin/version.h>
+# if CYGWIN_VERSION_DLL_COMBINED < CYGWIN_VERSION_DLL_MAKE_COMBINED (1005, 25)
+  choke me
+# endif
+#endif]])],
+        [gl_cv_var_stdin_large_offset=yes],
+        [gl_cv_var_stdin_large_offset=no])])
+])
+
+# Prerequisites of lib/fseeko.c.
+AC_DEFUN([gl_PREREQ_FSEEKO],
 [
-  AC_LIBOBJ([fseeko])
-  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
-  REPLACE_FSEEKO=1
-  dnl If we are also using the fseek module, then fseek needs replacing, too.
-  m4_ifdef([gl_REPLACE_FSEEK], [gl_REPLACE_FSEEK])
+  dnl Native Windows has the function _fseeki64. mingw hides it, but mingw64
+  dnl makes it usable again.
+  AC_CHECK_FUNCS([_fseeki64])
 ])