icc编译出现calling a function without prototype问题？

gdutayj

C:\iccv7avr\bin\imakew -f MAIN.mak
    iccavr -c -e -D__ICC_VERSION=722 -DATMega16  -l -g -MLongJump -MHasMul -MEnhanced  temrun.c
!W F:\ICCAVR\温控2\temrun.c(128):[warning] calling a function without prototype may cause runtime errors if the function
does not return int or unsigned int
!W F:\ICCAVR\温控2\temrun.c(129):[warning] calling a function without prototype may cause runtime errors if the function
does not return int or unsigned int
    iccavr -o MAIN -g -e:0x4000 -ucrtatmega.o -bfunc_lit:0x54.0x4000 -dram_end:0x45f -bdata:0x60.0x45f -dhwstk_size:30 -beeprom:0.512 -fihx_coff -S2 @MAIN.lk   -lcatmega
Device 15% full.
Done. Thu Nov 08 02:14:50 2012
我明明在前面已经加了头文件
#include "ioconfig.h"
#include "datacomm.h"
#include "pwm.h"
#include "itoa.h"
#include "uart.h"
#include "lcd1602.h"
#include "ds18b20.h"
#include "delay.h"

itoa.h头文件如下
#ifndef _itoa_H__
#define _itoa_H__
unsigned char*tochar(unsigned int num,unsigned char*str);
unsigned char*settochar(unsigned char num,unsigned char*str);
#endif
为什么还有函数未声明的警告？

yklstudent

!W F:\ICCAVR\温控2\temrun.c(128):[warning] calling a function without prototype may cause runtime errors if the function
does not return int or unsigned int

lusson

不一定是函数未声明
把程序放上来是王道

gdutayj

lusson 发表于 2012-11-8 08:23
不一定是函数未声明
把程序放上来是王道

都放上来，那如果函数很多的话，不是很多很乱吗？

gdutayj

发现编译两次，就没有这样的问题了，我同学说是编译次序的问题