ld bug!

[BluesLan]

Dear Sirs,

 

Sorry to bother you with this confusing phenomenon. I'm not sure whether it's a ld bug or not. Read the following descriptions please:

 

I've 2 simple and unmeaningful C source files(just for describing my problem), and they contribute to a simple project :

 

<t1.c> :

char qq=11;

void test2(void);

int main()

{

    printf("sizeof(qq)=%d\n", sizeof(qq));

    test2();

    return 0;

}

 

<t2.c>

char *qq;

void test2(void)

{

    qq=88;

    printf("sizeof(qq)=%d\n", sizeof(qq));

}

 

==============================

As above shown, these 2 source files both define a variable qq, it should cause the bug of multiply-defined symbols while linking, but it won't! The compiling and linking processes work successfully! The most confusing result is that I get 2 different size of the same variable(I guess ld treats the 2 qqs as the same variable) while executing:one is length 1, the another is length 4!

If I initialize the variable qq in t2.c(e.g., char *qq=0;), the ld reports "multiply definition of 'qq'". It's the result I wish, but I wonder why ld cannot report this bug if I do not initialize qq in t2.c.

 

the version of gcc : 2.96 20000731

the version of ld : 2.11.90.0.8

the environment : RedHat 7.2

 

Thanks for you response!

 

Best Regards,

Blues