Add -C gcc compatible option which does currently nothing. This allows, among others, to compile gnumake from git ROOTB.

libtcc.c

@@ -1622,7 +1622,8 @@ enum {
     TCC_OPTION_MF,
     TCC_OPTION_x,
     TCC_OPTION_ar,
-    TCC_OPTION_impdef
+    TCC_OPTION_impdef,
+    TCC_OPTION_C
 };
 
 #define TCC_OPTION_HAS_ARG 0x0001
@@ -1690,6 +1691,7 @@ static const TCCOption tcc_options[] = {
 #ifdef TCC_TARGET_PE
     { "impdef", TCC_OPTION_impdef, 0},
 #endif
+    { "C", TCC_OPTION_C, 0},
     { NULL, 0, 0 },
 };
 
@@ -2065,6 +2067,7 @@ reparse:
         case TCC_OPTION_pedantic:
         case TCC_OPTION_pipe:
         case TCC_OPTION_s:
+        case TCC_OPTION_C:
             /* ignored */
             break;
         default:

tcc.c

@@ -48,6 +48,7 @@ static const char help[] =
     "  -Dsym[=val]  define 'sym' with value 'val'\n"
     "  -Usym        undefine 'sym'\n"
     "  -E           preprocess only\n"
+    "  -C           keep comments (not yet implemented)\n"
     "Linker options:\n"
     "  -Ldir        add library path 'dir'\n"
     "  -llib        link with dynamic or static library 'lib'\n"