Gcc adds path to the source code to the final compilation

Vladislav_Kravchenko · March 29, 2020, 7:39pm

Hello EveryOne!

I use PIO for compiling for STM32. Everything works well but bin (as well as elf) file contains information to a location of the source files.
How to remove this information from the compiled files?

maxgerhardt · March 29, 2020, 8:34pm

That the ELF has meta information containing paths is OK.

If the bin has it, it has to compiled in by the code. With what framework are you working? Do you or any of the code you use, use the __FILE__ macro?

Vladislav_Kravchenko · March 30, 2020, 11:15am

That is for bin.

I use stm32duino. No FILE macro is used in my project (but I’m not sure about the framework)

maxgerhardt · March 30, 2020, 12:12pm

What string do you see in the .bin? To which source code file is it pointing? Yours or somewhere in the framework?

Vladislav_Kravchenko · March 30, 2020, 12:18pm

It seems that there are links to framework libs:

maxgerhardt · March 30, 2020, 12:29pm

Makes sense, because the code calls the Error_Handler() macro in various places

github.com

stm32duino/Arduino_Core_STM32/blob/1.7.0/cores/arduino/stm32/twi.c#L221


      
                  clkSrcFreq = CSI_VALUE;
                  break;
          #endif
          #ifdef RCC_I2C1CLKSOURCE_PLL3
                case RCC_I2C1CLKSOURCE_PLL3:
                  HAL_RCCEx_GetPLL3ClockFreq(&PLL3_Clocks);
                  clkSrcFreq = PLL3_Clocks.PLL3_R_Frequency;
                  break;
          #endif
                default:
                  Error_Handler();
              }
            }
          #endif // I2C1_BASE
          #if defined I2C2_BASE
            if (i2c == I2C2) {
          #ifdef __HAL_RCC_GET_I2C2_SOURCE
              switch (__HAL_RCC_GET_I2C2_SOURCE()) {
                case RCC_I2C2CLKSOURCE_HSI:
                  clkSrcFreq = HSI_VALUE;
                  break;

github.com

stm32duino/Arduino_Core_STM32/blob/1.7.0/variants/Generic_F103Rx/variant.cpp#L110


      
          
          
/* Initializes the CPU, AHB and APB busses clocks */
          RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
          RCC_OscInitStruct.HSEState = RCC_HSE_ON;
          RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
          RCC_OscInitStruct.HSIState = RCC_HSI_ON;
          RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
          RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
          RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
          if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
            Error_Handler();
          }
          /* Initializes the CPU, AHB and APB busses clocks */
          RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
                                        | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
          RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
          RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
          RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
          RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
          
          
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) {

Which evaluates to…

github.com

stm32duino/Arduino_Core_STM32/blob/8a79938d8fd5f6f5db5b521ebca9c10078ee27ad/cores/arduino/stm32/stm32_def.h#L80-L82


      
          void _Error_Handler(const char *, int);
          
          
#define Error_Handler() _Error_Handler(__FILE__, __LINE__)

github.com

stm32duino/Arduino_Core_STM32/blob/1.7.0/cores/arduino/stm32/stm32_def.c#L13-L19


      
          WEAK void _Error_Handler(const char *msg, int val)
          {
            /* User can add his own implementation to report the HAL error return state */
            core_debug("Error: %s (%i)\n", msg, val);
            while (1) {
            }
          }

So everywhere where the Error_Handler() is called you do have the __FILE__ reference as I have foreseen.

You can modify the stm32_def.h to make ErrorHandler() an empty macro and see if the strings are gone, to confirm.

Vladislav_Kravchenko · March 30, 2020, 6:32pm

Maximilian, I changed #define Error_Handler() _Error_Handler(FILE, LINE) to #define Error_Handler() _Error_Handler(FUNCTION, LINE) and that removes the filenames in bin file. But I’ve changed stm32_def.h file that is the framework file and it will be updated with an upgrade. So this is not a nice solution but works.

The good thing to do it at program level. But as I understand there is no option to overload macros (and #define Error_Handler() looks like a macro). Are there other ways to get rid of the file names in bin? What do you think?

PS. If I do #undef Error_Handler()
#define Error_Handler() _Error_Handler(FUNCTION, LINE) in my main.h that doesn’t help