Remove C++ comments from preproc C test

Closes issue #2127

Examples/test-suite/preproc.i

@@ -13,11 +13,11 @@
 
 %{
 #if defined(__clang__)
-//Suppress: warning: use of logical '&&' with constant operand [-Wconstant-logical-operand]
+/*Suppress: warning: use of logical '&&' with constant operand [-Wconstant-logical-operand]*/
 #pragma clang diagnostic ignored "-Wconstant-logical-operand"
 #endif
 #if defined(_MSC_VER)
-  #pragma warning(disable: 4003) // not enough actual parameters for macro 'FOO2'
+  #pragma warning(disable: 4003) /* not enough actual parameters for macro 'FOO2' */
 #endif
 %}
 
@@ -72,14 +72,14 @@ extern "C"
 
 TYPEMAP_LIST_VECTOR_INPUT_OUTPUT(boolean)
 
-// preproc_3
+/* preproc_3 */
 
 #define Sum( A, B, \
              C)    \
         A + B + C 
 
 
-// preproc_4
+/* preproc_4 */
 %{
   int hello0()
   {
@@ -102,33 +102,30 @@ TYPEMAP_LIST_VECTOR_INPUT_OUTPUT(boolean)
 
 #define HELLO_TYPE(A, B) ARITH_RTYPE(A, ARITH_RTYPE(A,B))
 
-//
-// These two work fine
-//
 int hello0();
 ARITH_RTYPE(double,int) hello1();
 
 
-//
+/*
-// This doesn't work with 1.3.17+ ( but it was ok in 1.3.16 )
+   This doesn't work with 1.3.17+ ( but it was ok in 1.3.16 )
-// it gets expanded as (using -E)
+   it gets expanded as (using -E)
-// 
+
-//   ARITH_RTYPE(double,int) hello2();
+     ARITH_RTYPE(double,int) hello2();
-//
+*/
 HELLO_TYPE(double,int) hello2();
 
 #define min(x,y) ((x) < (y)) ? (x) : (y) 
 int f(int min);
 
-// preproc_5
+/* preproc_5 */
 
-%warnfilter(SWIGWARN_PARSE_REDEFINED) A5;	// Ruby, wrong constant name
+%warnfilter(SWIGWARN_PARSE_REDEFINED) A5;	/* Ruby, wrong constant name */
-%warnfilter(SWIGWARN_RUBY_WRONG_NAME) a5;	// Ruby, wrong constant name
+%warnfilter(SWIGWARN_RUBY_WRONG_NAME) a5;	/* Ruby, wrong constant name */
-%warnfilter(SWIGWARN_RUBY_WRONG_NAME) b5;	// Ruby, wrong constant name
+%warnfilter(SWIGWARN_RUBY_WRONG_NAME) b5;	/* Ruby, wrong constant name */
-%warnfilter(SWIGWARN_RUBY_WRONG_NAME) c5;	// Ruby, wrong constant name
+%warnfilter(SWIGWARN_RUBY_WRONG_NAME) c5;	/* Ruby, wrong constant name */
-%warnfilter(SWIGWARN_RUBY_WRONG_NAME) d5;	// Ruby, wrong constant name
+%warnfilter(SWIGWARN_RUBY_WRONG_NAME) d5;	/* Ruby, wrong constant name */
 
-// Various preprocessor bits of nastiness.
+/* Various preprocessor bits of nastiness. */
 
 
 /* Test argument name substitution */
@@ -138,7 +135,7 @@ int f(int min);
 %constant char *a5 = foo(hello,world);
 %constant int   b5 = bar(3,4);
 
-// Wrap your brain around this one ;-)
+/* Wrap your brain around this one ;-) */
 
 %{
 #define cat(x,y) x ## y
@@ -168,7 +165,7 @@ NAME 42
 
 #define C4"Hello"
 
-// preproc_6
+/* preproc_6 */
 
 %warnfilter(SWIGWARN_PARSE_REDEFINED) A6; /* Ruby, wrong constant name */
 %warnfilter(SWIGWARN_RUBY_WRONG_NAME) a6; /* Ruby, wrong constant name */
@@ -206,7 +203,7 @@ NAME 42
 
 MACRO2(int)
 
-// cpp_macro_noarg.  Tests to make sure macros with no arguments work right.
+/* cpp_macro_noarg.  Tests to make sure macros with no arguments work right. */
 #define MACROWITHARG(x) something(x) 
 
 typedef int MACROWITHARG; 
@@ -373,8 +370,10 @@ int methodX(int x);
 int methodX(int x) { return x+100; }
 %}
 
-// Comma in macro - https://github.com/swig/swig/issues/974 (for /* */)
+/*
-// and https://github.com/swig/swig/pull/1166 (for //)
+   Comma in macro - https://github.com/swig/swig/issues/974 (for C comments)
+   and https://github.com/swig/swig/pull/1166 (for //)
+*/
 %inline %{
 #define swig__attribute__(x)
 #define TCX_PACKED(d) d swig__attribute__ ((__packed__))
@@ -394,19 +393,19 @@ TCX_PACKED (typedef struct tcxMessageBugImpl
 
 TCX_PACKED (typedef struct tcxMessageTestImpl2
 {
-    int mHeader; ///< comment
+    int mHeader; /**< comment */
 }) tcxMessageTest2;
 
 
 TCX_PACKED (typedef struct tcxMessageBugImpl2
 {
-    int mBid; ///< Bid price and size, check PresentMap if available in message
+    int mBid; /**< Bid price and size, check PresentMap if available in message */
 }) tcxMessageBug2;
 
 
 %}
 
-// Regression tests for https://github.com/swig/swig/pull/1111
+/* Regression tests for https://github.com/swig/swig/pull/1111 */
 %{
 static int foo_func(int x) { return x; }
 static int foo_func2() { return 0; }
@@ -422,22 +421,22 @@ static int baz_func(int a, int b, int c) { return a + b - c; }
 #define FOOVAR(...) foo_func(__VA_ARGS__)
 #define BARVAR(...) bar_func(__VA_ARGS__)
 #define BAZVAR(...) baz_func(__VA_ARGS__)
-// This has probably always worked, but make sure that the fix to accept
+/* This has probably always worked, but make sure that the fix to accept
-// an empty X doesn't cause this case to be incorrectly expanded:
+   an empty X doesn't cause this case to be incorrectly expanded:*/
 const int FOO = 7;
-// BAR was incorrectly expanded here, causing:
+/* BAR was incorrectly expanded here, causing:
-// Error: Syntax error in input(1).
+   Error: Syntax error in input(1). */
 const int BAR = 6;
-// This has probably always worked, but make sure that the fix to accept
+/* This has probably always worked, but make sure that the fix to accept
-// an empty X doesn't stop a non-empty X from working:
+   an empty X doesn't stop a non-empty X from working: */
 FOO(int x)
-// FOO() didn't used to get expanded here, causing:
+/* FOO() didn't used to get expanded here, causing:
-// Syntax error in input(1).
+   Syntax error in input(1). */
 FOO2()
-// Check BAR2() still gets expanded here.
+/* Check BAR2() still gets expanded here. */
 BAR2() {
-    // Regression test - this used to fail with:
+    /* Regression test - this used to fail with:
-    // Error: Macro 'BAZ' expects 3 arguments
+       Error: Macro 'BAZ' expects 3 arguments */
     BAZ(,2,3);
     BARVAR();
     FOOVAR(1);