--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/spellcheck-identifiers.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,136 @@
+/* { dg-do compile } */
+/* { dg-options "-Wimplicit-function-declaration -fdiagnostics-show-caret" } */
+
+typedef struct GtkWidget { int dummy; } GtkWidget;
+
+extern void gtk_widget_show_all (GtkWidget *w);
+
+void
+test_1 (GtkWidget *w)
+{
+  gtk_widget_showall (w); /* { dg-warning "3: implicit declaration of function .gtk_widget_showall.; did you mean .gtk_widget_show_all.?" } */
+  /* { dg-begin-multiline-output "" }
+   gtk_widget_showall (w);
+   ^~~~~~~~~~~~~~~~~~
+   gtk_widget_show_all
+   { dg-end-multiline-output "" } */
+
+  /* Ensure we don't try to suggest "gtk_widget_showall" for subsequent
+     corrections.  */
+  gtk_widget_showall_ (w); /* { dg-warning "3: implicit declaration of function .gtk_widget_showall_.; did you mean .gtk_widget_show_all.?" } */
+  /* { dg-begin-multiline-output "" }
+   gtk_widget_showall_ (w);
+   ^~~~~~~~~~~~~~~~~~~
+   gtk_widget_show_all
+   { dg-end-multiline-output "" } */
+
+  GtkWidgetShowAll (w); /* { dg-warning "3: implicit declaration of function .GtkWidgetShowAll.; did you mean .gtk_widget_show_all.?" } */
+  /* { dg-begin-multiline-output "" }
+   GtkWidgetShowAll (w);
+   ^~~~~~~~~~~~~~~~
+   gtk_widget_show_all
+   { dg-end-multiline-output "" } */
+}
+
+int
+test_2 (int param)
+{
+  return parma * parma; /* { dg-error "10: .parma. undeclared .first use in this function.; did you mean .param." } */
+  /* { dg-begin-multiline-output "" }
+   return parma * parma;
+          ^~~~~
+          param
+   { dg-end-multiline-output "" } */
+}
+
+#define MACRO(X) ((X))
+
+int
+test_3 (int i)
+{
+  return MACRAME (i); /* { dg-warning "10: implicit declaration of function .MACRAME.; did you mean .MACRO.?" } */
+  /* { dg-begin-multiline-output "" }
+   return MACRAME (i);
+          ^~~~~~~
+          MACRO
+   { dg-end-multiline-output "" } */
+}
+
+#define IDENTIFIER_POINTER(X) ((X))
+
+int
+test_4 (int node)
+{
+  return IDENTIFIER_PTR (node); /* { dg-warning "10: implicit declaration of function .IDENTIFIER_PTR.; did you mean .IDENTIFIER_POINTER.?" } */
+  /* { dg-begin-multiline-output "" }
+   return IDENTIFIER_PTR (node);
+          ^~~~~~~~~~~~~~
+          IDENTIFIER_POINTER
+   { dg-end-multiline-output "" } */
+}
+
+
+int
+test_5 (void)
+{
+  return __LINE_; /* { dg-error "10: .__LINE_. undeclared .first use in this function.; did you mean .__LINE__." } */
+  /* { dg-begin-multiline-output "" }
+   return __LINE_;
+          ^~~~~~~
+          __LINE__
+   { dg-end-multiline-output "" } */
+}
+
+#define MAX_ITEMS 100
+int array[MAX_ITEM]; /* { dg-error "11: .MAX_ITEM. undeclared here .not in a function.; did you mean .MAX_ITEMS." } */
+  /* { dg-begin-multiline-output "" }
+ int array[MAX_ITEM];
+           ^~~~~~~~
+           MAX_ITEMS
+   { dg-end-multiline-output "" } */
+
+
+enum foo {
+  FOO_FIRST,
+  FOO_SECOND
+};
+
+int
+test_6 (enum foo f)
+{
+  switch (f)
+    {
+    case FOO_FURST: /* { dg-error "10: .FOO_FURST. undeclared .first use in this function.; did you mean .FOO_FIRST." } */
+      break;
+  /* { dg-begin-multiline-output "" }
+     case FOO_FURST:
+          ^~~~~~~~~
+          FOO_FIRST
+   { dg-end-multiline-output "" } */
+
+    case FOO_SECCOND: /* { dg-error "10: .FOO_SECCOND. undeclared .first use in this function.; did you mean .FOO_SECOND." } */
+      break;
+  /* { dg-begin-multiline-output "" }
+     case FOO_SECCOND:
+          ^~~~~~~~~~~
+          FOO_SECOND
+   { dg-end-multiline-output "" } */
+
+    default:
+      break;
+    }
+}
+
+int snprintf (char *, __SIZE_TYPE__, const char *, ...);
+
+void
+test_7 (int i, int j)
+{
+  int buffer[100];
+  snprint (buffer, 100, "%i of %i", i, j); /* { dg-warning "3: implicit declaration of function .snprint.; did you mean .snprintf.." } */
+  /* { dg-begin-multiline-output "" }
+   snprint (buffer, 100, "%i of %i", i, j);
+   ^~~~~~~
+   snprintf
+   { dg-end-multiline-output "" } */
+}