Merge commit 'a39d4083cab589d7cd6a13e8a4b8db8875261d75'

[gnulib.git] / m4 / getline.m4

diff --git a/m4/getline.m4 b/m4/getline.m4
index 2fd393f..0330666 100644 (file)
--- a/m4/getline.m4
+++ b/m4/getline.m4
@@ -1,45 +1,96 @@
-#serial 2
+# getline.m4 serial 26
+
+dnl Copyright (C) 1998-2003, 2005-2007, 2009-2014 Free Software Foundation,
+dnl 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([2.59])
 
 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 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_CHECK_FUNC(getline,
-               dnl Found it in some library.  Verify that it works.
-               am_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)
-    AC_CACHE_CHECK([for working getline function], am_cv_func_working_getline,
-    [echo fooN |tr -d '\012'|tr N '\012' > conftestdata
-    AC_TRY_RUN([
+AC_DEFUN([gl_FUNC_GETLINE],
+[
+  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
+
+  dnl Persuade glibc <stdio.h> to declare getline().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  AC_CHECK_DECLS_ONCE([getline])
+
+  gl_getline_needs_run_time_check=no
+  AC_CHECK_FUNC([getline],
+                [dnl Found it in some library.  Verify that it works.
+                 gl_getline_needs_run_time_check=yes],
+                [am_cv_func_working_getline=no])
+  if test $gl_getline_needs_run_time_check = yes; then
+    AC_CACHE_CHECK([for working getline function], [am_cv_func_working_getline],
+    [echo fooNbarN | tr -d '\012' | tr N '\012' > conftest.data
+    AC_RUN_IFELSE([AC_LANG_SOURCE([[
 #    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;
-      size_t siz = 0;
-      int len;
-      FILE *in = fopen ("./conftestdata", "r");
+    {
+      FILE *in = fopen ("./conftest.data", "r");
       if (!in)
-       return 1;
-      len = getline (&line, &siz, in);
-      exit ((len == 4 && line && strcmp (line, "foo\n") == 0) ? 0 : 1);
+        return 1;
+      {
+        /* Test result for a NULL buffer and a zero size.
+           Based on a test program from Karl Heuer.  */
+        char *line = NULL;
+        size_t siz = 0;
+        int len = getline (&line, &siz, in);
+        if (!(len == 4 && line && strcmp (line, "foo\n") == 0))
+          return 2;
+      }
+      {
+        /* Test result for a NULL buffer and a non-zero size.
+           This crashes on FreeBSD 8.0.  */
+        char *line = NULL;
+        size_t siz = (size_t)(~0) / 4;
+        if (getline (&line, &siz, in) == -1)
+          return 3;
+      }
+      return 0;
     }
-    ], 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.
+    ]])], [am_cv_func_working_getline=yes] dnl The library version works.
+    , [am_cv_func_working_getline=no] dnl The library version does NOT work.
+    , 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) && !defined __UCLIBC__
+  Lucky GNU user
+ #endif
+#endif
+         ],
+         [am_cv_func_working_getline="guessing yes"],
+         [am_cv_func_working_getline="guessing no"])]
     )])
   fi
 
-  if test $am_cv_func_working_getline = no; then
-    LIBOBJS="$LIBOBJS getline.o"
-    AC_SUBST(LIBOBJS)dnl
+  if test $ac_cv_have_decl_getline = no; then
+    HAVE_DECL_GETLINE=0
   fi
+
+  case "$am_cv_func_working_getline" in
+    *no)
+      dnl Set REPLACE_GETLINE always: Even if we have not found the broken
+      dnl getline function among $LIBS, it may exist in libinet and the
+      dnl executable may be linked with -linet.
+      REPLACE_GETLINE=1
+      ;;
+  esac
+])
+
+# Prerequisites of lib/getline.c.
+AC_DEFUN([gl_PREREQ_GETLINE],
+[
+  :
 ])