RX GCC linker bug

Question

I'm experiencing the problem mentioned in the FAQ number 3000668: 
 Program Built with --gc-sections Option Does Not Run in GCC Project | Renesas Customer Hub 
 
 This bug is easily reproducible just by creating a new GCC project for the microcontroller R5F5671EHxFB with C++ and FreeRTOS. 
 By default, the compiler option --gc-sections is beeing enabled. If you disable it, the code works as expected. 
 
 The program is breaking inside 'vTaskStartScheduler', when it tries to call some static privileged fuctions. 
 
 I've tried to add KEEP to the .ctors and .dtors sections in the linker file as mentioned here: 8.3.7 Gc-sections Option (microchip.com) , but it does not solve the problem. There must be something else missconfigured.

I do not want to disable this option, because it reduces the size of the final binary file. 
 
 Can you check what's the cause of the failure?

SebP · Accepted Answer

Hi Viviana, Looking at the linker script, your issues is at line 29. 
 .rvectors ALIGN(4): { _rvectors_start = .; INCLUDE ../src/smc_gen/r_bsp/mcu/all/linker_script_rvectors.inc <------ this gets removed with --gc-sections _rvectors_end = .; } > ROM 
 It looks like you created a e2 studio project with the Smart Configurator (SC) enabled. 
 If you create a project without SC the same line of code will look like (which has no issue when using --gc-sections): 
 .rvectors ALIGN(4): { _rvectors_start = .; KEEP(*(.rvectors)) _rvectors_end = .; } > ROM 
 You can verify this by checking the map file. 
 In case you need to continue with the SC project I have the following workaround for you: 
 https://llvm-gcc-renesas.com/wiki/index.php?title=RX_automatic_interrupt_vector_entry_usage 
 I will also inform the SC about this.

RX GCC linker bug

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