CC-RXでWarning Levelを上げるOptionはインフォメーションメッセージ出力オプションだと知ったので試してみました

/* Increase CC-RX warning level by using -message option
 * See JapanRenesasRulz post : https://japan.renesasrulz.com/cafe_rene/f/forum5/4421/thread/23330#23330
 */

/* /* nested comment */

int func(int, int, int, int);

volatile void sub1(int);
volatile int sub2(int);

volatile static int var = 1;;

/* See FIT BSP source files : r_bsp\board\XXXX\lowsrc.c, r_bsp\mcu\YYYY\mcu_interrupts.c
 * See also JapanRenesasRulz post : https://japan.renesasrulz.com/cafe_rene/f/forum5/4059/sci/20672#20672
 */
/* This macro is used to suppress compiler messages about a parameter not being used in a function. The nice thing
 * about using this implementation is that it does not take any extra RAM or ROM.
 */
#define INTERNAL_NOT_USED(p)        ((void)(p))

int func(int arg1, int arg2, int arg3, int arg4)
{
    unsigned char ch;

    arg1;
    INTERNAL_NOT_USED(arg2);
#if INTERNAL_NOT_USED
    INTERNAL_NOT_USED(arg3);
#endif  /* INTERNAL_NOT_USED */

    sub1(ch);
    ch = sub2(arg4);

    while (1) { volatile unsigned char ch; }
    while (1) {}

    return ch;
}

========== リコンパイルの開始(2017年7月19日 16:39:43) ==========
------ ビルド開始(user_app_not_with_toppers, DefaultBuild) ------
>..\..\sample\toppers_r_usb_pcdc_echo_apl\ccrx_show_info_msg.c
..\..\sample\toppers_r_usb_pcdc_echo_apl\ccrx_show_info_msg.c(5):M0520009:Nested comment is not allowed
..\..\sample\toppers_r_usb_pcdc_echo_apl\ccrx_show_info_msg.c(9):M0520815:Type qualifier on return type is meaningless
..\..\sample\toppers_r_usb_pcdc_echo_apl\ccrx_show_info_msg.c(10):W0520815:Type qualifier on return type is meaningless
..\..\sample\toppers_r_usb_pcdc_echo_apl\ccrx_show_info_msg.c(12):M0520082:Storage class is not first
..\..\sample\toppers_r_usb_pcdc_echo_apl\ccrx_show_info_msg.c(12):M0520381:Extra ";" ignored
..\..\sample\toppers_r_usb_pcdc_echo_apl\ccrx_show_info_msg.c(26):M0520174:Expression has no effect
..\..\sample\toppers_r_usb_pcdc_echo_apl\ccrx_show_info_msg.c(28):M0520193:Zero used for undefined preprocessing identifier "INTERNAL_NOT_USED"
..\..\sample\toppers_r_usb_pcdc_echo_apl\ccrx_show_info_msg.c(32):M0523034:Conversion in argument
..\..\sample\toppers_r_usb_pcdc_echo_apl\ccrx_show_info_msg.c(32):M0520549:Variable "ch" is used before its value is set
..\..\sample\toppers_r_usb_pcdc_echo_apl\ccrx_show_info_msg.c(33):M0523033:Precision lost
..\..\sample\toppers_r_usb_pcdc_echo_apl\ccrx_show_info_msg.c(35):M0521348:Declaration hides variable "ch" (declared at line 24)
..\..\sample\toppers_r_usb_pcdc_echo_apl\ccrx_show_info_msg.c(36):M0520128:Loop is not reachable from preceding code
..\..\sample\toppers_r_usb_pcdc_echo_apl\ccrx_show_info_msg.c(38):M0520111:Statement is unreachable
..\..\sample\toppers_r_usb_pcdc_echo_apl\ccrx_show_info_msg.c(38):M0523035:Conversion in return
..\..\sample\toppers_r_usb_pcdc_echo_apl\ccrx_show_info_msg.c(22):M0520826:Parameter "arg3" was never referenced
------ ビルド終了(エラー:0個, 警告:1個)(user_app_not_with_toppers, DefaultBuild) ------
========== 終了しました(成功:1プロジェクト, 失敗:0プロジェクト)(2017年7月19日 16:39:49) ==========