What's the meaning of this warning: this decimal constant is unsignedonly in ISO C90

[Nan Li]

Hello,

Can any one help me understand the meaning of this warning: this
decimal constant is unsigned only in ISO C90 ? I think -2147483648 is
the min number for 32 bit signed integer.

#include <stdint.h>

static const int32_t value = -2147483648;

warning: this decimal constant is unsigned only in ISO C90

gcc version 4.0.2 20051125


Thanks !

 

[Juha Nieminen]

It would be much better to use the macro INT32_MIN, from <stdint.h>,
in the initialization.

For what it's worth, at least here INT32_MIN is defined as:
(-2147483647-1)

The reason is probably what you explained.