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[gnulib.git] / m4 / getline.m4

diff --git a/m4/getline.m4 b/m4/getline.m4
index 697a82e..5b55c30 100644 (file)
--- a/m4/getline.m4
+++ b/m4/getline.m4
@@ -1,26 +1,37 @@
-#serial 3
+# getline.m4 serial 15
+
+dnl Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2006 Free Software
+dnl Foundation, Inc.
+dnl
+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.
+
+AC_PREREQ(2.52)
 
 dnl See if there's a working, system-supplied version of the getline function.
 dnl We can't just do AC_REPLACE_FUNCS(getline) because some systems
 dnl have a function by that name in -linet that doesn't have anything
 dnl to do with the function we need.
-AC_DEFUN(AM_FUNC_GETLINE,
-[dnl
-  am_getline_needs_run_time_check=no
+AC_DEFUN([gl_FUNC_GETLINE],
+[
+  dnl Persuade glibc <stdio.h> to declare getline().
+  AC_REQUIRE([AC_GNU_SOURCE])
+
+  AC_CHECK_DECLS([getline])
+
+  gl_getline_needs_run_time_check=no
   AC_CHECK_FUNC(getline,
                dnl Found it in some library.  Verify that it works.
-               am_getline_needs_run_time_check=yes,
+               gl_getline_needs_run_time_check=yes,
                am_cv_func_working_getline=no)
-  if test $am_getline_needs_run_time_check = yes; then
-    AC_CHECK_HEADERS(string.h)
+  if test $gl_getline_needs_run_time_check = yes; then
     AC_CACHE_CHECK([for working getline function], am_cv_func_working_getline,
     [echo fooN |tr -d '\012'|tr N '\012' > conftest.data
     AC_TRY_RUN([
 #    include <stdio.h>
-#    include <sys/types.h>
-#    if HAVE_STRING_H
-#     include <string.h>
-#    endif
+#    include <stdlib.h>
+#    include <string.h>
     int main ()
     { /* Based on a test program from Karl Heuer.  */
       char *line = NULL;
@@ -34,12 +45,35 @@ AC_DEFUN(AM_FUNC_GETLINE,
     }
     ], am_cv_func_working_getline=yes dnl The library version works.
     , am_cv_func_working_getline=no dnl The library version does NOT work.
-    , am_cv_func_working_getline=no dnl We're cross compiling.
+    , dnl We're cross compiling. Assume it works on glibc2 systems.
+      [AC_EGREP_CPP([Lucky GNU user],
+         [
+#include <features.h>
+#ifdef __GNU_LIBRARY__
+ #if (__GLIBC__ >= 2)
+  Lucky GNU user
+ #endif
+#endif
+         ],
+         [am_cv_func_working_getline=yes],
+         [am_cv_func_working_getline=no])]
     )])
   fi
 
   if test $am_cv_func_working_getline = no; then
-    LIBOBJS="$LIBOBJS getline.$ac_objext"
-    AC_SUBST(LIBOBJS)dnl
+    dnl We must choose a different name for our function, since on ELF systems
+    dnl a broken getline() in libc.so would override our getline() in
+    dnl libgettextlib.so.
+    AC_DEFINE([getline], [gnu_getline],
+      [Define to a replacement function name for getline().])
+    AC_LIBOBJ(getline)
+
+    gl_PREREQ_GETLINE
   fi
 ])
+
+# Prerequisites of lib/getline.c.
+AC_DEFUN([gl_PREREQ_GETLINE],
+[
+  gl_FUNC_GETDELIM
+])