finding the size of an array before it exists?

What I have is an array of unsigned chars the first byte is actually the number of elements in the array. So is it possible to have the compiler calculate the size of the array using sizeof()? or is...
finding the size of an array before it exists?

What I have is an array of unsigned chars the first byte is actually the number of elements in the array. So is it possible to have the compiler calculate the size of the array using sizeof()? or is...
Optimizing code size

Hi, I am developing an application for ARM lpc2102.The code size is very critical so I decided to look for list file generated by Keil: var | = EXPAND LDR R0=var LDRB R1,[R0,#0x0] MOV R0,#0x1 ORR...
Optimizing code size

Hi, I am developing an application for ARM lpc2102.The code size is very critical so I decided to look for list file generated by Keil: var | = EXPAND LDR R0=var LDRB R1,[R0,#0x0] MOV R0,#0x1 ORR...
using "run user program before"

I would like to use "run user program before" or some such to set a #define from one place in several builds i.e. build #1 will pick the #define from 'x' build #2 will also pick the #define from 'x...