Howto parameterize memory size in linker scipts?

Hello,

is there a way to parameterize the memory length in a linker file? I started with:

"bootloader_offset" = 0x00; _flashsize = 256K; MEMORY { FLASH0 (rx) : ORIGIN = 0x08000000, LENGTH = _flashsize SRAM0 (rwx) : ORIGIN = 0x20000000, LENGTH = 40K CCM (rwx) : ORIGIN = 0x10000000, LENGTH = 8K }

INCLUDE stm32f10x_flash.ld

but even that results in

stm32f303xC_flash.ld:14: nonconstant expression for length collect2:
> error: ld returned 1 exit status

with line 14 the line referencing _flashsize.

Parameterize the memory definition would allow a single linker script for a whole family of chips.

Thanks