Compile error caused by case of filename extension

[Shriramana Sharma <samjnaa@xxxxxxxxx>]

When the contents of TESTING.C are:

#include "stdio.h"
void main(void)
{
	printf("\n%d\n", ( -0.25 < 0) ? 2 : 4);
}

Upon trying to compile:

$ gcc -o TESTING TESTING.C
TESTING.C:3: error: ‘::main’ must return ‘int’

Then I changed the file to:

#include "stdio.h"
int main(void)
{
	printf("\n%d\n", ( -0.25 < 0) ? 2 : 4);
	return 1;
}

Then I got:

$ gcc -o TESTING TESTING.C
/tmp/ccEnQk4o.o:(.eh_frame+0x11): undefined reference to 
`__gxx_personality_v0'
collect2: ld returned 1 exit status

But if I change the input file name extension to testing.c or even TESTING.c 
(small letters) no problems were got. Why is this?

-- 

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$ date [] CCE +2006-03-25 W12-6 UTC+0530
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