NEWS.stable: log cherry-pick [8029e49]->[6f83d07] autoupdate

[gnulib.git] / m4 / pty.m4

diff --git a/m4/pty.m4 b/m4/pty.m4
index f795792..d2966bc 100644 (file)
--- a/m4/pty.m4
+++ b/m4/pty.m4
@@ -1,4 +1,4 @@
-# pty.m4 serial 4
+# pty.m4 serial 9
 dnl Copyright (C) 2010 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -20,12 +20,16 @@ AC_DEFUN([gl_PTY_LIB],
   AC_SUBST([PTY_LIB])
 ])
 
-AC_DEFUN([gl_FORKPTY],
+AC_DEFUN([gl_FUNC_FORKPTY],
 [
   AC_REQUIRE([gl_PTY_LIB])
   AC_REQUIRE([gl_PTY_H])
 
+  dnl We assume that forkpty exists (possibly in libc, possibly in libutil)
+  dnl if and only if it is declared.
   AC_CHECK_DECLS([forkpty],,, [[
+/* <sys/types.h> is a prerequisite of <libutil.h> on FreeBSD 8.0.  */
+#include <sys/types.h>
 #if HAVE_PTY_H
 # include <pty.h>
 #endif
@@ -36,15 +40,15 @@ AC_DEFUN([gl_FORKPTY],
 # include <libutil.h>
 #endif
 ]])
-  if test $ac_cv_have_decl_forkpty = no; then
-    AC_MSG_WARN([[Cannot find forkpty, build will likely fail]])
-  fi
-
-  dnl Prefer glibc's const-safe prototype, if available.
-  AC_CACHE_CHECK([for const-safe forkpty signature],
-    [gl_cv_func_forkpty_const],
-    [AC_COMPILE_IFELSE(
-      [AC_LANG_PROGRAM([[
+  if test $ac_cv_have_decl_forkpty = yes; then
+    dnl The system has forkpty.
+    dnl Prefer glibc's const-safe prototype, if available.
+    AC_CACHE_CHECK([for const-safe forkpty signature],
+      [gl_cv_func_forkpty_const],
+      [AC_COMPILE_IFELSE(
+        [AC_LANG_PROGRAM([[
+/* <sys/types.h> is a prerequisite of <libutil.h> on FreeBSD 8.0.  */
+#include <sys/types.h>
 #if HAVE_PTY_H
 # include <pty.h>
 #endif
@@ -54,18 +58,25 @@ AC_DEFUN([gl_FORKPTY],
 #if HAVE_LIBUTIL_H
 # include <libutil.h>
 #endif
-      ]], [[
-        int forkpty (int *, char *, struct termios const *,
-                     struct winsize const *);
-      ]])],
-      [gl_cv_func_forkpty_const=yes], [gl_cv_func_forkpty_const=no])])
-  if test $gl_cv_func_forkpty_const != yes; then
-    REPLACE_FORKPTY=1
+          ]], [[
+            int forkpty (int *, char *, struct termios const *,
+                         struct winsize const *);
+          ]])
+        ],
+        [gl_cv_func_forkpty_const=yes], [gl_cv_func_forkpty_const=no])
+      ])
+    if test $gl_cv_func_forkpty_const != yes; then
+      REPLACE_FORKPTY=1
+      AC_LIBOBJ([forkpty])
+    fi
+  else
+    dnl The system does not have forkpty.
+    HAVE_FORKPTY=0
     AC_LIBOBJ([forkpty])
   fi
 ])
 
-AC_DEFUN([gl_OPENPTY],
+AC_DEFUN([gl_FUNC_OPENPTY],
 [
   AC_REQUIRE([gl_PTY_LIB])
   AC_REQUIRE([gl_PTY_H])
@@ -76,6 +87,8 @@ AC_DEFUN([gl_OPENPTY],
   dnl We assume that openpty exists (possibly in libc, possibly in libutil)
   dnl if and only if it is declared.
   AC_CHECK_DECLS([openpty],,, [[
+/* <sys/types.h> is a prerequisite of <libutil.h> on FreeBSD 8.0.  */
+#include <sys/types.h>
 #if HAVE_PTY_H
 # include <pty.h>
 #endif
@@ -93,6 +106,8 @@ AC_DEFUN([gl_OPENPTY],
       [gl_cv_func_openpty_const],
       [AC_COMPILE_IFELSE(
         [AC_LANG_PROGRAM([[
+/* <sys/types.h> is a prerequisite of <libutil.h> on FreeBSD 8.0.  */
+#include <sys/types.h>
 #if HAVE_PTY_H
 # include <pty.h>
 #endif
@@ -112,6 +127,8 @@ AC_DEFUN([gl_OPENPTY],
     if test $gl_cv_func_openpty_const != yes; then
       REPLACE_OPENPTY=1
       AC_LIBOBJ([openpty])
+      AC_DEFINE([HAVE_OPENPTY], [1],
+        [Define to 1 if the system has the 'openpty' function.])
     fi
   else
     dnl The system does not have openpty.
@@ -125,7 +142,10 @@ AC_DEFUN([gl_FUNC_LOGIN_TTY],
 [
   AC_REQUIRE([gl_PTY_LIB])
 
-  AC_CHECK_FUNCS_ONCE([login_tty])
+  gl_saved_libs="$LIBS"
+  LIBS="$LIBS $PTY_LIB"
+  AC_CHECK_FUNCS([login_tty])
+  LIBS="$gl_saved_LIBS"
   if test $ac_cv_func_login_tty = no; then
     AC_LIBOBJ([login_tty])
   fi