stm32 链接脚本没有 .gcc_except_table 段也能支持 C++ 异常

stm32 使用 cubemx 生成的 gnu ld 链接脚本没有 .gcc_except_table 段。如下所示

/*
******************************************************************************
**
** @file        : LinkerScript.ld
**
** @author      : Auto-generated by STM32CubeIDE
**
**  Abstract    : Linker script for test Board embedding STM32F407ZETx Device from stm32f4 series
**                      512KBytes FLASH
**                      64KBytes CCMRAM
**                      128KBytes RAM
**
**                Set heap size, stack size and stack location according
**                to application requirements.
**
**                Set memory bank area and size if external memory is used
**
**  Target      : STMicroelectronics STM32
**
**  Distribution: The file is distributed as is, without any warranty
**                of any kind.
**
******************************************************************************
** @attention
**
** Copyright (c) 2025 STMicroelectronics.
** All rights reserved.
**
** This software is licensed under terms that can be found in the LICENSE file
** in the root directory of this software component.
** If no LICENSE file comes with this software, it is provided AS-IS.
**
******************************************************************************
*//* Entry Point */
ENTRY(Reset_Handler)/* Highest address of the user mode stack */
_estack = ORIGIN(RAM) + LENGTH(RAM); /* end of "RAM" Ram type memory */_Min_Heap_Size = 0x200; /* required amount of heap */
_Min_Stack_Size = 0x400; /* required amount of stack *//* Memories definition */
MEMORY
{CCMRAM    (xrw)    : ORIGIN = 0x10000000,   LENGTH = 64KRAM    (xrw)    : ORIGIN = 0x20000000,   LENGTH = 128KFLASH    (rx)    : ORIGIN = 0x8000000,   LENGTH = 512K
}/* Sections */
SECTIONS
{/* The startup code into "FLASH" Rom type memory */.isr_vector :{. = ALIGN(4);KEEP(*(.isr_vector)) /* Startup code */. = ALIGN(4);} >FLASH/* The program code and other data into "FLASH" Rom type memory */.text :{. = ALIGN(4);*(.text)           /* .text sections (code) */*(.text*)          /* .text* sections (code) */*(.glue_7)         /* glue arm to thumb code */*(.glue_7t)        /* glue thumb to arm code */*(.eh_frame)KEEP (*(.init))KEEP (*(.fini)). = ALIGN(4);_etext = .;        /* define a global symbols at end of code */} >FLASH/* Constant data into "FLASH" Rom type memory */.rodata :{. = ALIGN(4);*(.rodata)         /* .rodata sections (constants, strings, etc.) */*(.rodata*)        /* .rodata* sections (constants, strings, etc.) */. = ALIGN(4);} >FLASH.ARM.extab   : {. = ALIGN(4);*(.ARM.extab* .gnu.linkonce.armextab.*). = ALIGN(4);} >FLASH.ARM : {. = ALIGN(4);__exidx_start = .;*(.ARM.exidx*)__exidx_end = .;. = ALIGN(4);} >FLASH.preinit_array     :{. = ALIGN(4);PROVIDE_HIDDEN (__preinit_array_start = .);KEEP (*(.preinit_array*))PROVIDE_HIDDEN (__preinit_array_end = .);. = ALIGN(4);} >FLASH.init_array :{. = ALIGN(4);PROVIDE_HIDDEN (__init_array_start = .);KEEP (*(SORT(.init_array.*)))KEEP (*(.init_array*))PROVIDE_HIDDEN (__init_array_end = .);. = ALIGN(4);} >FLASH.fini_array :{. = ALIGN(4);PROVIDE_HIDDEN (__fini_array_start = .);KEEP (*(SORT(.fini_array.*)))KEEP (*(.fini_array*))PROVIDE_HIDDEN (__fini_array_end = .);. = ALIGN(4);} >FLASH/* Used by the startup to initialize data */_sidata = LOADADDR(.data);/* Initialized data sections into "RAM" Ram type memory */.data :{. = ALIGN(4);_sdata = .;        /* create a global symbol at data start */*(.data)           /* .data sections */*(.data*)          /* .data* sections */*(.RamFunc)        /* .RamFunc sections */*(.RamFunc*)       /* .RamFunc* sections */. = ALIGN(4);_edata = .;        /* define a global symbol at data end */} >RAM AT> FLASH_siccmram = LOADADDR(.ccmram);/* CCM-RAM section** IMPORTANT NOTE!* If initialized variables will be placed in this section,* the startup code needs to be modified to copy the init-values.*/.ccmram :{. = ALIGN(4);_sccmram = .;       /* create a global symbol at ccmram start */*(.ccmram)*(.ccmram*). = ALIGN(4);_eccmram = .;       /* create a global symbol at ccmram end */} >CCMRAM AT> FLASH/* Uninitialized data section into "RAM" Ram type memory */. = ALIGN(4);.bss :{/* This is used by the startup in order to initialize the .bss section */_sbss = .;         /* define a global symbol at bss start */__bss_start__ = _sbss;*(.bss)*(.bss*)*(COMMON). = ALIGN(4);_ebss = .;         /* define a global symbol at bss end */__bss_end__ = _ebss;} >RAM/* User_heap_stack section, used to check that there is enough "RAM" Ram  type memory left */._user_heap_stack :{. = ALIGN(8);PROVIDE ( end = . );PROVIDE ( _end = . );. = . + _Min_Heap_Size;. = . + _Min_Stack_Size;. = ALIGN(8);} >RAM/* Remove information from the compiler libraries*//DISCARD/ :{libc.a ( * )libm.a ( * )libgcc.a ( * )}.ARM.attributes 0 : { *(.ARM.attributes) }
}

但是也能支持 C++ 异常。能够正确调用 try 块内的对象的析构函数，能够正确调用抛出的异常对象的析构函数。

使用如下的测试代码

class Exception
{
public:~Exception(){base::console.WriteLine(__func__);}
};try
{class Test{public:~Test(){base::console.WriteLine(__func__);}};class Exception1 :public Exception{public:~Exception1(){base::console.WriteLine(__func__);}};Test test;throw Exception1{};
}
catch (Exception const &e)
{base::console.WriteLine("被 catch (Exception const &e) 捕获。");
}
catch (...)
{base::console.WriteLine("被 catch (...) 捕获。");
}

运行结果如下

~Test
被 catch (Exception const &e) 捕获。
~Exception1
~Exception