32位嵌入式处理器编程：warning: integer constant is too large for 'long' type

最新推荐文章于 2020-11-22 09:28:45 发布

zhaoqiaoshi

最新推荐文章于 2020-11-22 09:28:45 发布

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在使用EDK进行软件应用开发时，若定义longlonginteger类型变量出现编译警告，解释原因并提供解决方法：此警告是因为gcc语法严格要求在长整型常量末尾添加LL。通过在常量后添加LL即可消除警告，不影响64位计算的正确性。

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疑问描述

Keywords: EDK, long long integer, 64-bit, SW, mb-gcc, powerpc-eabi-gcc, compiler, C/C++ , g++

When I define a long long integer data type in SW application in EDK, a warning / error similar to the following occurs:

"warning: integer constant is too large for 'long' type".

Example:
int main ()
{
long long int test = 0x0008888000000000;
},

解决方案

The warning message can be safely ignored, as mb-gcc is not doing anything wrong; the 64-bit computing is in fact correct.

This warning occurs because gcc is strict in syntax and requires LL on the end of such constants. This warning message disappears if the integer is appended with LL.

long long int test = 0x0008888000000000LL;