update UNITY_OUTPUT_CHAR to not return a value (because we never check it anyway).

add UNITY_OUTPUT_FLUSH to make sure we get the output we need on aborted tests and whatnot.

src/unity.c

@@ -7,11 +7,18 @@
 #include "unity.h"
 #include <stddef.h>
 
+//If omitted from header, declare overrideable prototypes here so they're ready for use
 #ifdef UNITY_OMIT_OUTPUT_CHAR_HEADER_DECLARATION
-int UNITY_OUTPUT_CHAR(int); //If omitted from header, declare it here so it's ready for use
+int UNITY_OUTPUT_CHAR(int);
 #endif
+#ifdef UNITY_OMIT_OUTPUT_FLUSH_HEADER_DECLARATION
+int UNITY_OUTPUT_FLUSH(void);
+#endif
+
+//Helpful macros for us to use here
 #define UNITY_FAIL_AND_BAIL   { Unity.CurrentTestFailed  = 1; longjmp(Unity.AbortFrame, 1); }
 #define UNITY_IGNORE_AND_BAIL { Unity.CurrentTestIgnored = 1; longjmp(Unity.AbortFrame, 1); }
+
 /// return prematurely if we are already in failure or ignore state
 #define UNITY_SKIP_EXECUTION  { if ((Unity.CurrentTestFailed != 0) || (Unity.CurrentTestIgnored != 0)) {return;} }
 
@@ -331,6 +338,7 @@ void UnityConcludeTest(void)
     Unity.CurrentTestFailed = 0;
     Unity.CurrentTestIgnored = 0;
     UNITY_PRINT_EOL();
+    UNITY_OUTPUT_FLUSH();
 }
 
 //-----------------------------------------------
@@ -1290,6 +1298,7 @@ int UnityEnd(void)
 #endif
     }
     UNITY_PRINT_EOL();
+    UNITY_OUTPUT_FLUSH();
     UNITY_OUTPUT_COMPLETE();
     return (int)(Unity.TestFailures);
 }

src/unity_internals.h

@@ -290,11 +290,22 @@ typedef UNITY_DOUBLE_TYPE _UD;
 #ifndef UNITY_OUTPUT_CHAR
 //Default to using putchar, which is defined in stdio.h
 #include <stdio.h>
-#define UNITY_OUTPUT_CHAR(a) putchar(a)
+#define UNITY_OUTPUT_CHAR(a) (void)putchar(a)
 #else
-//If defined as something else, make sure we declare it here so it's ready for use
+  //If defined as something else, make sure we declare it here so it's ready for use
   #ifndef UNITY_OMIT_OUTPUT_CHAR_HEADER_DECLARATION
-extern int UNITY_OUTPUT_CHAR(int);
+extern void UNITY_OUTPUT_CHAR(int);
+  #endif
+#endif
+
+#ifndef UNITY_OUTPUT_FLUSH
+//Default to using putchar, which is defined in stdio.h
+#include <stdio.h>
+#define UNITY_OUTPUT_FLUSH() (void)fflush(stdout)
+#else
+  //If defined as something else, make sure we declare it here so it's ready for use
+  #ifndef UNITY_OMIT_OUTPUT_FLUSH_HEADER_DECLARATION
+extern void UNITY_OUTPUT_FLUSH(void);
   #endif
 #endif
 

test/tests/testparameterized.c

@@ -8,7 +8,7 @@
 #include <stdio.h>
 #include "unity.h"
 
-int putcharSpy(int c) {return putchar(c);} // include passthrough for linking tests
+void putcharSpy(int c) { (void)putchar(c);} // include passthrough for linking tests
 
 #define TEST_CASE(...)
 

test/tests/testunity.c

@@ -2247,7 +2247,7 @@ char* getBufferPutcharSpy(void)
 #endif
 }
 
-int putcharSpy(int c)
+void putcharSpy(int c)
 {
 #ifdef USING_OUTPUT_SPY
     if (putcharSpyEnabled)
@@ -2257,7 +2257,6 @@ int putcharSpy(int c)
     } else
         c = putchar(c);
 #endif
-    return c;
 }
 
 void testFailureCountIncrementsAndIsReturnedAtEnd(void)