testsuite: don't declare printf in coro.h

mingw stdio.h plays horrible games with extern "C++", but it also seems
sloppy for coro.h to declare printf in testcases that will also include
standard headers.

gcc/testsuite/ChangeLog:

	* g++.dg/coroutines/coro.h: #include <stdio.h> instead of
	declaring puts/printf.
	* g++.dg/coroutines/torture/mid-suspend-destruction-0.C:
	#include <stdio.h>.
	* g++.dg/coroutines/pr95599.C: Use PRINT instead of puts.
	* g++.dg/coroutines/torture/call-00-co-aw-arg.C:
	* g++.dg/coroutines/torture/call-01-multiple-co-aw.C:
	* g++.dg/coroutines/torture/call-02-temp-co-aw.C:
	* g++.dg/coroutines/torture/call-03-temp-ref-co-aw.C:
	* g++.dg/coroutines/torture/co-await-00-trivial.C:
	* g++.dg/coroutines/torture/co-await-01-with-value.C:
	* g++.dg/coroutines/torture/co-await-02-xform.C:
	* g++.dg/coroutines/torture/co-await-03-rhs-op.C:
	* g++.dg/coroutines/torture/co-await-04-control-flow.C:
	* g++.dg/coroutines/torture/co-await-05-loop.C:
	* g++.dg/coroutines/torture/co-await-06-ovl.C:
	* g++.dg/coroutines/torture/co-await-07-tmpl.C:
	* g++.dg/coroutines/torture/co-await-08-cascade.C:
	* g++.dg/coroutines/torture/co-await-09-pair.C:
	* g++.dg/coroutines/torture/co-await-11-forwarding.C:
	* g++.dg/coroutines/torture/co-await-12-operator-2.C:
	* g++.dg/coroutines/torture/co-await-13-return-ref.C:
	* g++.dg/coroutines/torture/co-await-14-return-ref-to-auto.C:
	* g++.dg/coroutines/torture/pr95003.C: Likewise.

gcc/testsuite/g++.dg/coroutines/coro.h

@@ -129,10 +129,6 @@ namespace coro = std;
 
 #endif // __has_include(<experimental/coroutine>)
 
-/* just to avoid cluttering dump files. */
-extern "C" int puts (const char *);
-extern "C" int printf (const char *, ...);
-
 #include <cstdlib> /* for abort () */
 
 #include <utility> /* for std::forward */
@@ -141,6 +137,7 @@ extern "C" int printf (const char *, ...);
 #  define PRINT(X)
 #  define PRINTF (void)
 #else
+#include <stdio.h>
 #  define PRINT(X) puts(X)
 #  define PRINTF printf
 #endif

gcc/testsuite/g++.dg/coroutines/pr95599.C

@@ -64,6 +64,6 @@ int main ()
       PRINTF ("something happened in the wrong order %d, %d, %d, %d, %d, %d, %d\n", a, b, c, d, e, f, g);
       abort ();
     }
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
 }

gcc/testsuite/g++.dg/coroutines/torture/call-00-co-aw-arg.C

@@ -68,6 +68,6 @@ int main ()
       abort ();
     }
 
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
-}
+}

gcc/testsuite/g++.dg/coroutines/torture/call-01-multiple-co-aw.C

@@ -68,6 +68,6 @@ int main ()
       abort ();
     }
 
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
 }

gcc/testsuite/g++.dg/coroutines/torture/call-02-temp-co-aw.C

@@ -67,6 +67,6 @@ int main ()
       abort ();
     }
 
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
 }

gcc/testsuite/g++.dg/coroutines/torture/call-03-temp-ref-co-aw.C

@@ -67,6 +67,6 @@ int main ()
       abort ();
     }
 
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
 }

gcc/testsuite/g++.dg/coroutines/torture/co-await-00-trivial.C

@@ -47,6 +47,6 @@ int main ()
       PRINTF ("main: y is wrong : %d, should be 11\n", y);
       abort ();
     }
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
 }

gcc/testsuite/g++.dg/coroutines/torture/co-await-01-with-value.C

@@ -52,6 +52,6 @@ int main ()
       PRINTF ("main: y is wrong : %d, should be 15\n", y);
       abort ();
     }
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
 }

gcc/testsuite/g++.dg/coroutines/torture/co-await-02-xform.C

@@ -53,6 +53,6 @@ int main ()
       PRINTF ("main: y is wrong : %d, should be 42\n", y);
       abort ();
     }
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
 }

gcc/testsuite/g++.dg/coroutines/torture/co-await-03-rhs-op.C

@@ -53,6 +53,6 @@ int main ()
       PRINTF ("main: y is wrong : %d, should be 42\n", y);
       abort ();
     }
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
 }

gcc/testsuite/g++.dg/coroutines/torture/co-await-04-control-flow.C

@@ -47,6 +47,6 @@ int main ()
       PRINTF ("main: y is wrong : %d, should be 42\n", y);
       abort ();
     }
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
 }

gcc/testsuite/g++.dg/coroutines/torture/co-await-05-loop.C

@@ -46,6 +46,6 @@ int main ()
       PRINTF ("main: y is wrong : %d, should be 111\n", y);
       abort ();
     }
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
 }

gcc/testsuite/g++.dg/coroutines/torture/co-await-06-ovl.C

@@ -60,6 +60,6 @@ int main ()
       PRINTF ("main: y is wrong : %d, should be 11\n", y);
       abort ();
     }
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
 }

gcc/testsuite/g++.dg/coroutines/torture/co-await-07-tmpl.C

@@ -127,6 +127,6 @@ int main ()
       PRINTF ("main: y is wrong : %d, should be 42\n", y);
       abort ();
     }
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
 }

gcc/testsuite/g++.dg/coroutines/torture/co-await-08-cascade.C

@@ -58,6 +58,6 @@ int main ()
       PRINTF ("main: y is wrong : %d, should be 14672\n", y);
       abort ();
     }
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
 }

gcc/testsuite/g++.dg/coroutines/torture/co-await-09-pair.C

@@ -52,6 +52,6 @@ int main ()
       PRINTF ("main: y is wrong : %d, should be 57\n", y);
       abort ();
     }
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
 }

gcc/testsuite/g++.dg/coroutines/torture/co-await-11-forwarding.C

@@ -38,6 +38,6 @@ int main ()
       PRINTF ("main: y is wrong : %d, should be 15\n", y);
       abort ();
     }
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
 }

gcc/testsuite/g++.dg/coroutines/torture/co-await-12-operator-2.C

@@ -61,6 +61,6 @@ int main ()
       PRINTF ("main: y is wrong : %d, should be 14\n", y);
       abort ();
     }
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
 }

gcc/testsuite/g++.dg/coroutines/torture/co-await-13-return-ref.C

@@ -53,6 +53,6 @@ int main ()
       PRINTF ("main: y is wrong : %d, should be 15\n", y);
       abort ();
     }
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
 }

gcc/testsuite/g++.dg/coroutines/torture/co-await-14-return-ref-to-auto.C

@@ -40,6 +40,6 @@ int main ()
       PRINT ("main: we should be 'done' ");
       abort ();
     }
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
 }

gcc/testsuite/g++.dg/coroutines/torture/mid-suspend-destruction-0.C

@@ -8,6 +8,7 @@
 // go out of scope.
 
 #include "../coro.h"
+#include <stdio.h>
 
 struct coro1 {
   struct promise_type;

gcc/testsuite/g++.dg/coroutines/torture/pr95003.C

@@ -45,6 +45,6 @@ int main ()
       PRINTF ("main: y is wrong : %d, should be 100\n", y);
       abort ();
     }
-  puts ("main: done");
+  PRINT ("main: done");
   return 0;
 }