使gcc警告隐式转换 [英] Make gcc warn implicit conversions

问题描述

可能重复:
我也可以让GCC在通过时发出警告功能类型?

Possible Duplicate:
Can I make GCC warn on passing too-wide types to functions?

很多时候，我通过将long传递给整数函数而导致错误.

Many times I cause bugs by passing a long to an integer function.

这样做时，我可以让gcc警告我吗?

Can I make gcc warn me when I'm doing that?

推荐答案

尝试-Wconversion.

int fn(int);
int bar(long x) { return fn(x); }

gcc -c t.c  -Wconversion
t.c: In function ‘bar’:
t.c:3: warning: conversion to ‘int’ from ‘long int’ may alter its value

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