cannot use LENGTH() in memory definition in linker file for arm gcc 8-2018-q4-major

Recently we have updated the armgcc toolchain version to 8-2018-q4-major, and we found that our previous memory definition way in linker file is invalid.

Previously, we are using below LENGTH() way to calculate the origin for a defined memory:

IMAGE_START_ADDR = DEFINED(XIP_IMAGE) ? 0x10000000 : 0x00000000;
DATA_START_ADDR = DEFINED(XIP_IMAGE) ? 0x00000004 : 0x20000000;
TEXT_SECTION_SIZE = DEFINED(XIP_IMAGE) ? 0x00FFFE3C : 0x0002FE3C;
DATA_SECTION_SIZE = DEFINED(XIP_IMAGE) ? 0x0002FFFC : 0x00028000;

/* Specify the memory areas */
MEMORY
{
m_interrupts (RX) : ORIGIN = IMAGE_START_ADDR, LENGTH = 0x000001C4
m_text (RX) : ORIGIN = IMAGE_START_ADDR + LENGTH(m_interrupts), LENGTH = TEXT_SECTION_SIZE
m_data (RW) : ORIGIN = DATA_START_ADDR, LENGTH = DATA_SECTION_SIZE
m_usb_sram (RW) : ORIGIN = 0x40100000, LENGTH = 0x00002000
}

AND there will show build error as below:

/usr/local/gcc-arm-none-eabi-8-2018-q4-major/bin/../lib/gcc/arm-none-eabi/8.2.1/../../../../arm-none-eabi/bin/ld: invalid origin for memory region m_text

After replace the  LENGTH(m_interrupts) with Immediate 0x000001C4, the compile error gone.

No such issue with armgcc version 7-2018-q2-update, so, why gcc8 cannot support the way in memory definition?

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