C++ exceptions can sometimes fail causing a std::terminate on every throw

Question

C++ exceptions can sometimes fail causing a std::terminate on every throw. This turns out to be a linker issue present in the following files: 
 nRF5_SDK_17.0.2/components/toolchain/gcc/gcc_nrf51_common.ld nRF5_SDK_17.0.2/modules/nrfx/mdk/nrf_common.ld nRF5_SDK_17.0.2/modules/nrfx/mdk/nrf51_common.ld nRF5_SDK_17.0.2/modules/nrfx/mdk/nrf52_common.ld 
 The section that needs changing is: 
 __exidx_start = .;
.ARM.exidx :
{
	*(.ARM.exidx* .gnu.linkonce.armexidx.*)
	. = ALIGN(4);
} > FLASH
__exidx_end = .; 
 To: 
 .ARM.exidx :
{
	__exidx_start = .;
	*(.ARM.exidx* .gnu.linkonce.armexidx.*)
	. = ALIGN(4);
	__exidx_end = .;
} > FLASH 
 There's a good write up on this issue here: https://community.nxp.com/t5/MCUXpresso-IDE/MCUX-11-1-0-C-exceptions-not-being-caught-w-solution/m-p/1015296 
 The main issue is that __exidz_start can sometimes be placed outside of the ARM.exidx region causing the stack unwinding to always fail 
 This issue isn't present in the Zephyr implementation as that contains the fixed version

Heidi · Accepted Answer

Hi! 
 
 Thank you! I have reported this bug and I will post an update here when it's been fixed. 
 
 Best regards, 
 Heidi

C++ exceptions can sometimes fail causing a std::terminate on every throw

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