Compiler error when migrating to SES 3 and SDK14

Question

Hello, I'm practicing this blog; Segger Embedded Studio - A Cross Platform IDE on the following environment. 64-bit Windows 10 desktop SEGGER J-Link 6.16h 64-bit SEGGER Embedded Studio (SES) 3.26 PCA10040 v1.1.1 nRF5_SDK_14.0.0_3bcc1f7 imported Keil MDK 5 project using ble_app_cts_c example The blog showed several steps. Importing a Keil uVision project Nuances Adding nRF5 MDK Files Peer Manager/Flash Data Storage Building and more. I have used ble_app_cts_c example instead of the beacon example. I have tried until Peer Manager/Flash Data Storage . Also, I have configured the compiler further like this. I chose GNU11. However, compared to Keil MDK 5 that it was compiled and build successfully, I observed two compiler errors. - When configured to GCC; variably modified '_do_assert' at file scope // In app_util.h /**@brief Macro for doing static (i.e. compile time) assertion. * * @note If the EXPR isn't resolvable, then the error message won't be shown. * @note The output of STATIC_ASSERT will be different across different compilers. * * @param[in] EXPR Constant expression to be verified. * @hideinitializer */ #define STATIC_ASSERT(EXPR) \ extern char (*_do_assert(void)) [sizeof(char[1 - 2*!(EXPR)])] - When configured to Clang; unknown register name 'vfpcc' in asm #if (__FPU_PRESENT == 1U) && (__FPU_USED == 1U) /* in cmsis_gcc.h*/ /* Empty asm statement works as a scheduling barrier */ __ASM volatile (""); __ASM volatile ("VMSR fpscr, %0" : : "r" (fpscr) : "vfpcc"); __ASM volatile (""); #endif Surprisingly, looks like I'm the only person who had this type of trouble while migrating to SES. :( Are there extra configurations needed to solve these compile errors? Additionally, is it impossible to use Clang? Lastly, I use STM32 boards with SES. The blog tells me to modify the thumb_crt0.s file. I haven't used that file when I was working with STM32 boards. Then this modification won't affect other projects, right? /*************************************************************************************/ Edited: 7, Sept. 2017 This is the content of the flash_placement.xml file. I think I have to edit the flash_placement.xml due to the following error message; elf section `.log_dynamic_data' will not fit in region `UNPLACED_SECTIONS' undefined reference to __stop_log_const_data undefined reference to __start_log_const_data undefined reference to __start_log_dynamic_data I think these fields should be written in the XML file. However, I don't know how and what specifications are needed. Did you add something in the XML file, @Joakim? Or do I need to remove a preprocessor? -Best Regards

Joakim Jakobsen · Accepted Answer

Hi MANGO! 
 Sorry for the delayed response. I can confirm that we see the same error as you do, and we are working on a fix for it. 
 In the meanwhile you can try to change the following in app_util.h: 
 #define STATIC_ASSERT(EXPR) \
 extern char (*_do_assert(void)) [sizeof(char[1 - 2*!(EXPR)])]
 
 to: 
 #define STATIC_ASSERT(EXPR) \
 // extern char (*_do_assert(void)) [sizeof(char[1 - 2*!(EXPR)])]
 
 This should should remove the error you are seeing, and can be used as temporary fix. It's not recommended to do so, but for testing purposes it should be fine. 
 
 EDIT: 06.09.17 
 You can disregard the above. Regarding the variably modified '_do_assert' at file scope error when using GCC as compiler: 
In the file app_util.h, add this workaround at aprox. line 90: 
 #if defined(__SES_ARM) && defined(__GNUC__)
#undef offsetof 
#define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
#endif
 
 Your code should look something like this: 
 enum
{
 UNIT_0_625_MS = 625, /**< Number of microseconds in 0.625 milliseconds. */
 UNIT_1_25_MS = 1250, /**< Number of microseconds in 1.25 milliseconds. */
 UNIT_10_MS = 10000 /**< Number of microseconds in 10 milliseconds. */
};

#if defined(__SES_ARM) && defined(__GNUC__)
#undef offsetof 
#define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
#endif

/**@brief Implementation specific macro for delayed macro expansion used in string concatenation
*
* @param[in] lhs Left hand side in concatenation
* @param[in] rhs Right hand side in concatenation
*/
#define STRING_CONCATENATE_IMPL(lhs, rhs) lhs ## rhs
 
 When following the blog-post on DevZone and applying this workaround, you should be able to make SES work with SDK 14. 
 flash_placement.xml 
 Best regards, 
Joakim.