Please just make some chip defines for the f4, like is done for l1 and f1: ./lib/stm32/f1/stm32f100xe.ld
./lib/stm32/f1/stm32f100x6.ld
./lib/stm32/f1/stm32f100xd.ld
./lib/stm32/f1/stm32f100xc.ld
./lib/stm32/f1/stm32f100x8.ld
./lib/stm32/f1/stm32f100x4.ld
./lib/stm32/l1/stm32l15xx8.ld

They're common enough target boards there's no need to keep making new stubs all over the place.