How to avoid linker ignore undefined symbols?

it is not a 100% clear to me what the problem is, but try to link with --keep flag, for example:

--keep FIRMWARE_TO_APP_RTX_SIGNAL_ROUTE.o(*)

Hi Tamir Michael,

Sorry, I did not describe the problem clearly. I write a example code to explain my problem. This example code is no problem when you compile it, but if you change the 'ITEM_2' to 'ITEM_foo' in the test.h, and use 'build target' this protect again (not rebuild all), the compiler will not tell you any thing wrong, only use 'rebuild all' can detect the undefined symbol.
My question is that how to avoid this potential issue when you use 'build target'.

file: test.h

enum{
        ITEM_1,
        ITEM_3
};

file: test.c

#include "test.h"
#include <stdio.h>

int main(void)
{
        printf("ITEM 1 = %d",ITEM_1);
        printf("ITEM 2 = %d",ITEM_2);
}

Thank you,
Snaku

sorry, the 'test.h' in last message should be

enum{
        ITEM_1,
        ITEM_2
};

They are Keil tools, aren't they?

Please give version numbers.

Hi Andy Neil,
Yes, I am using Keil RealView MDK-ARM Version 3.50.
Thank you,
Snaku