--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/wtr-conversion-1.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,66 @@
+/* Test for -Wtraditional warnings on conversions by prototypes.
+   Note, gcc should omit these warnings in system header files.
+   By Kaveh R. Ghazi <ghazi@caip.rutgers.edu> 4/09/2001.  */
+/* { dg-do compile } */
+/* { dg-options "-Wtraditional-conversion" } */
+
+extern void foo_i (int);
+extern void foo_f (float);
+extern void foo_ld (long double);
+extern void foo_cd (__complex__ double);
+
+extern int i;
+extern float f;
+extern long double ld;
+extern __complex__ double cd;
+
+void
+testfunc1 ()
+{
+  foo_i (i);
+  foo_i (f); /* { dg-warning "as integer rather than floating" "prototype conversion warning" } */
+  foo_i (ld); /* { dg-warning "as integer rather than floating" "prototype conversion warning" } */
+  foo_i (cd); /* { dg-warning "as integer rather than complex" "prototype conversion warning" } */
+
+  foo_f (i); /* { dg-warning "as floating rather than integer" "prototype conversion warning" } */
+  foo_f (f); /* { dg-warning "as 'float' rather than 'double'" "prototype conversion warning" } */
+  foo_f (ld); /* { dg-warning "as 'float' rather than 'double'" "prototype conversion warning" } */
+  foo_f (cd); /* { dg-warning "as floating rather than complex" "prototype conversion warning" } */
+
+  foo_ld (i); /* { dg-warning "as floating rather than integer" "prototype conversion warning" } */
+  foo_ld (f); /* { dg-warning "as 'float' rather than 'double'" "small double" { target { "avr-*-*" } } } */
+  foo_ld (ld);/* { dg-warning "as 'float' rather than 'double'" "small long double" { target { "avr-*-*" } } } */
+  foo_ld (cd);/* { dg-warning "as floating rather than complex" "prototype conversion warning" } */
+
+  foo_cd (i); /* { dg-warning "as complex rather than integer" "prototype conversion warning" } */
+  foo_cd (f); /* { dg-warning "as complex rather than floating" "prototype conversion warning" } */
+  foo_cd (ld); /* { dg-warning "as complex rather than floating" "prototype conversion warning" } */
+  foo_cd (cd);
+}
+  
+# 54 "sys-header.h" 3
+/* We are in system headers now, no -Wtraditional warnings should issue.  */
+
+void
+testfunc2 ()
+{
+  foo_i (i);
+  foo_i (f);
+  foo_i (ld);
+  foo_i (cd);
+
+  foo_f (i);
+  foo_f (f);
+  foo_f (ld);
+  foo_f (cd);
+
+  foo_ld (i);
+  foo_ld (f);
+  foo_ld (ld);
+  foo_ld (cd);
+
+  foo_cd (i);
+  foo_cd (f);
+  foo_cd (ld);
+  foo_cd (cd);
+}