Move GNU_LIBRARY_PENDING_OUTPUT_COUNT from src/s to configure

* configure.ac (GNU_LIBRARY_PENDING_OUTPUT_COUNT): Move here from src/s.

* src/s/gnu.h, src/s/gnu-linux.h:
Move GNU_LIBRARY_PENDING_OUTPUT_COUNT to configure.

5 files changed, 72 insertions, 36 deletions

diff --git a/ChangeLog b/ChangeLog
index 53259731ebf..17690d1d913 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2012-07-11  Glenn Morris  <rgm@gnu.org>
+
+	* configure.ac (GNU_LIBRARY_PENDING_OUTPUT_COUNT):
+	Move here from src/s.
+
 2012-07-11  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Assume rename, strerror.
diff --git a/configure.ac b/configure.ac
index ddb25534257..23ddaa7e9f5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3163,19 +3163,14 @@ dnl Used in sound.c
 AC_DEFINE_UNQUOTED(DEFAULT_SOUND_DEVICE, "$sound_device",
   [Name of the default sound device.])
 
-dnl Used in vm-limit.c
-AH_TEMPLATE(DATA_START, [Address of the start of the data segment.])
-dnl Used in lisp.h, emacs.c, mem-limits.h
-dnl NEWS.18 describes this as "a number which contains
-dnl the high bits to be inclusive or'ed with pointers that are unpacked."
-AH_TEMPLATE(DATA_SEG_BITS, [Extra bits to be or'd in with any pointers
-stored in a Lisp_Object.])
-dnl if Emacs uses fewer than 32 bits for the value field of a LISP_OBJECT.
-
 dnl Used in dispnew.c
 AH_TEMPLATE(PENDING_OUTPUT_COUNT, [Number of chars of output in the
 buffer of a stdio stream.])
 
+dnl FIXME just PENDING_OUTPUT_COUNT should suffice.
+AH_TEMPLATE(GNU_LIBRARY_PENDING_OUTPUT_COUNT, [Value of
+PENDING_OUTPUT_COUNT if using the GNU C library.])
+
 case $opsys in
   cygwin | darwin | freebsd | netbsd | openbsd )
     AC_DEFINE(PENDING_OUTPUT_COUNT(FILE), [((FILE)->_p - (FILE)->_bf._base)])
@@ -3185,6 +3180,63 @@ case $opsys in
     AC_DEFINE(PENDING_OUTPUT_COUNT(FILE), [((FILE)->__ptr - (FILE)->__base)])
     ;;
 
+  gnu | gnu-linux | gnu-kfreebsd )
+    AC_MSG_CHECKING([for style of pending output formalism])
+    dnl In autoconf 2.67 (?) and later, we could use a single test
+    dnl since the preprocessed output is accessible in "conftest.i".
+    AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[
+#include <stdio.h>
+#if !defined (_IO_STDIO_H) && !defined (_STDIO_USES_IOSTREAM)
+# error "stdio definitions not found"
+#endif
+      ]], [[]])], emacs_pending_output=new, emacs_pending_output=unknown)
+
+      if test $emacs_pending_output = unknown; then
+        case $opsys in
+          gnu-linux | gnu-kfreebsd)
+            AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[
+#include <stdio.h>
+#ifndef __UCLIBC__
+# error "not using uclibc"
+#endif
+            ]], [[]])], emacs_pending_output=uclibc, emacs_pending_output=old)
+            ;;
+        esac
+      fi
+
+      AC_MSG_RESULT([$emacs_pending_output])
+
+      case $emacs_pending_output in
+        new)
+          dnl New C libio names.
+          AC_DEFINE(GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE),
+            [((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)])
+          ;;
+        uclibc)
+          dnl Using the uClibc library.
+          AC_DEFINE(GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE),
+            [((FILE)->__bufpos - (FILE)->__bufstart)])
+          ;;
+        old)
+          dnl Old C++ iostream names.
+          AC_DEFINE(GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE),
+            [((FILE)->_pptr - (FILE)->_pbase)])
+          ;;
+      esac
+    ;;
+esac
+
+
+dnl Used in vm-limit.c
+AH_TEMPLATE(DATA_START, [Address of the start of the data segment.])
+dnl Used in lisp.h, emacs.c, mem-limits.h
+dnl NEWS.18 describes this as "a number which contains
+dnl the high bits to be inclusive or'ed with pointers that are unpacked."
+AH_TEMPLATE(DATA_SEG_BITS, [Extra bits to be or'd in with any pointers
+stored in a Lisp_Object.])
+dnl if Emacs uses fewer than 32 bits for the value field of a LISP_OBJECT.
+
+case $opsys in
   gnu)
     dnl libc defines data_start.
     AC_DEFINE(DATA_START, [({ extern int data_start; (char *) &data_start; })])
diff --git a/src/ChangeLog b/src/ChangeLog
index 64a7989a70f..045a3d374b8 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+2012-07-11  Glenn Morris  <rgm@gnu.org>
+
+	* s/gnu.h, s/gnu-linux.h:
+	Move GNU_LIBRARY_PENDING_OUTPUT_COUNT to configure.
+
 2012-07-11  John Wiegley  <johnw@newartisans.com>
 
 	* alloc.c (mark_memory): Guard the "no_address_safety_analysis"
diff --git a/src/s/gnu-linux.h b/src/s/gnu-linux.h
index 6f45ee00b78..9f8a994bb7e 100644
--- a/src/s/gnu-linux.h
+++ b/src/s/gnu-linux.h
@@ -92,25 +92,9 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
    your system and must be used only through an encapsulation
    (Which you should place, by convention, in sysdep.c).  */
 
-/* This is needed for dispnew.c:update_frame.  */
 #ifdef emacs
-#include <stdio.h>  /* Get the definition of _IO_STDIO_H.  */
-#if defined (_IO_STDIO_H) || defined (_STDIO_USES_IOSTREAM)
-/* New C libio names.  */
-#define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
-  ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
-#elif defined (__UCLIBC__)
-/* Using the uClibc library.  */
-#define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
-  ((FILE)->__bufpos - (FILE)->__bufstart)
-#else /* !_IO_STDIO_H && ! __UCLIBC__ */
-/* Old C++ iostream names.  */
-#define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
-  ((FILE)->_pptr - (FILE)->_pbase)
-#endif /* !_IO_STDIO_H && ! __UCLIBC__ */
-
 #define INTERRUPT_INPUT
-#endif /* emacs */
+#endif
 
 #define POSIX                 /* affects getpagesize.h and systty.h */
 
diff --git a/src/s/gnu.h b/src/s/gnu.h
index bac233266c8..9ec75081ca1 100644
--- a/src/s/gnu.h
+++ b/src/s/gnu.h
@@ -20,13 +20,3 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* Get most of the stuff from bsd-common */
 #include "bsd-common.h"
-
-/* It would be harmless to drop the ifdef emacs test.  */
-#ifdef emacs
-#include <stdio.h>  /* Get the definition of _IO_STDIO_H.  */
-#if defined (_IO_STDIO_H) || defined (_STDIO_USES_IOSTREAM)
-/* new C libio names */
-#define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
-  ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
-#endif /* !_IO_STDIO_H */
-#endif /* emacs */