disable a particular warning in C

kskkumar · 10-18-2007, 02:31 AM

I have my code and i get some warnings like

warning: initialization makes pointer from integer without a cast

which i knew it will happen. and this is a scenario some thing like shown below

typedef union
{
int *a;
int a1;
}MyUn;

when i try to initialize this union like

MyUn someVar = {1}

I get a warning

warning: initialization makes pointer from integer without a cast

I knew that 1 is not a pointer but integer. but it still show this warning. How to disable this warning / supress this warning message?

Hko · 10-18-2007, 04:58 AM

Initilize with a cast to int-pointer, and the warning will go away:

Code:

MyUn someVar = {(int*)1};

kskkumar · 10-18-2007, 05:04 AM

Is there any other way to avoid warning? because, i am assigning to integer not to integer pointer. So this is misleading as if i am assigning to an integer pointer.

Hko · 10-18-2007, 06:22 AM

You could just initialize the union variable first thing in main() of course:

Code:

typedef union
{
    int *a;
    int a1;
} MyUn;

MyUn someVar;

int main() 
{
    someVar.a1 = 1;
    return 0;
}

But if you really want a global variable initialized, you could also just swap the members of the union in the declaration:

Code:

typedef union
{
    int a1;
    int *a;
} MyUn;

MyUn someVar = {1};

kskkumar · 10-18-2007, 11:04 AM

Thanks. But at some place i will initialize it with address also. So i wnat some statement that can supress my warnings which is equivalent to #pragma warning(disable:<>) in windows.

ntubski · 10-18-2007, 04:06 PM

As far I can tell gcc has no option to disable warnings except from the command line. If you don't mind breaking compatibility with older compilers you can use the c99 style initialization:

Code:

MyUn some_var = {.a1 = 1};