Comment 7 for bug 1747966

OK, it might be possible that only STM32 header users suffer this problem. Can someone else confirm that GCC is not throwing his ISR with LTO and post some details about his ISR definitons?

Here's a part of STM32 startup file that difines ISR aliases. Can somebody check if it doesn't violates any GCC/GAS standard that could cause this bug?

/**
  ******************************************************************************
  * @file startup_stm32l476xx.s
  * @author MCD Application Team
  * @version V1.3.1
  * @date 21-April-2017
  * @brief STM32L476xx devices vector table GCC toolchain.
  * This module performs:
  * - Set the initial SP
  * - Set the initial PC == Reset_Handler,
  * - Set the vector table entries with the exceptions ISR address,
  * - Configure the clock system
  * - Branches to main in the C library (which eventually
  * calls main()).
  * After Reset the Cortex-M4 processor is in Thread mode,
  * priority is Privileged, and the Stack is set to Main.
  ******************************************************************************

LoopForever:
    b LoopForever

.size Reset_Handler, .-Reset_Handler

/**
 * @brief This is the code that gets called when the processor receives an
 * unexpected interrupt. This simply enters an infinite loop, preserving
 * the system state for examination by a debugger.
 *
 * @param None
 * @retval : None
*/
    .section .text.Default_Handler,"ax",%progbits
Default_Handler:
Infinite_Loop:
 b Infinite_Loop
 .size Default_Handler, .-Default_Handler
/******************************************************************************
*
* The minimal vector table for a Cortex-M4. Note that the proper constructs
* must be placed on this to ensure that it ends up at physical address
* 0x0000.0000.
*
******************************************************************************/
  .section .isr_vector,"a",%progbits
 .type g_pfnVectors, %object
 .size g_pfnVectors, .-g_pfnVectors

g_pfnVectors:
 .word _estack
 .word Reset_Handler
 .word NMI_Handler
 .word HardFault_Handler
 .word MemManage_Handler
 .word BusFault_Handler
 .word UsageFault_Handler
 .word 0
....

/*******************************************************************************
*
* Provide weak aliases for each Exception handler to the Default_Handler.
* As they are weak aliases, any function with the same name will override
* this definition.
*
*******************************************************************************/

  .weak NMI_Handler
 .thumb_set NMI_Handler,Default_Handler

  .weak HardFault_Handler
 .thumb_set HardFault_Handler,Default_Handler

  .weak MemManage_Handler
 .thumb_set MemManage_Handler,Default_Handler

  .weak BusFault_Handler
 .thumb_set BusFault_Handler,Default_Handler

 .weak UsageFault_Handler
 .thumb_set UsageFault_Handler,Default_Handler