!29 【开源贡献活动】 增加线程栈静态分析功能（python版本） https://gitee.com/rtthread/rt-thread/issues/I1I3UR

Merge pull request !29 from 来日方长/stackchecker_WorstCaseStack_giteemaster

Author: BernardXiong

bsp/stm32/stm32l475-atk-pandora/rtconfig.py

@@ -44,7 +44,7 @@
     OBJCPY = PREFIX + 'objcopy'
 
     DEVICE = ' -mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=hard -ffunction-sections -fdata-sections'
-    CFLAGS = DEVICE + ' -Dgcc'
+    CFLAGS = DEVICE + ' -Dgcc -fstack-usage -fdump-rtl-dfinish'
     AFLAGS = ' -c' + DEVICE + ' -x assembler-with-cpp -Wa,-mimplicit-it=thumb '
     LFLAGS = DEVICE + ' -Wl,--gc-sections,-Map=rt-thread.map,-cref,-u,Reset_Handler -T board/linker_scripts/link.lds'