如何修复 C 警告 'implicit declaration of function va_arg'

问题：

你有类似这样的 C 代码

main.c

va_list ap;
int mode = va_arg(ap, int);

va_list ap;
int mode = va_arg(ap, int);

但当你尝试编译它时，你看到类似这样的警告消息

error_message.txt

main.c:5:12: warning: implicit declaration of function ‘va_arg’ [-Wimplicit-function-declaration]
  int mode= va_arg(ap, int);

main.c:5:12: warning: implicit declaration of function ‘va_arg’ [-Wimplicit-function-declaration]
  int mode= va_arg(ap, int);

添加

stdarg_include.c

#include <stdarg.h>

#include <stdarg.h>

在错误发生的源文件顶部。这将包含 va_list 和 va_arg 的定义。

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