Clang intellisense is not recognising bool correctly

[wtywtykk]

Hi,

I’m having issue with the intellisense. It’s showing underlines on bool/true/false, saying “Use of undeclared identifier bool”. But the file can actually compile.

I think the problem may be some version discrepancy. In stdbool.h, it’s not declaring the type because it thinks it should be keywords, while clang doesn’t think so:

#if defined __STDC_VERSION__ && __STDC_VERSION__ > 201710L
/* bool, true and false are keywords. */
#else
#define bool _Bool
#define true 1
#define false 0
#endif

Example code to reproduce: Note the extension of the file is .c, not cpp.

The GCC tool chain version is 15.2.1/15.2/r1

 

#include

int main(void)
{
bool aaa = false;

return 0;
}

 

cmake_minimum_required(VERSION 3.15)

project(EmbeddedProject1_bool LANGUAGES C CXX ASM)

find_bsp(
ID com.sysprogs.arm.stm32f4
VERSION 1.28.0
MCU STM32F407VE
FRAMEWORKS com.sysprogs.arm.stm32.hal com.sysprogs.arm.stm32.ll
HWREGISTER_LIST_FILE STM32F4xxxx/DeviceDefinitions/stm32f407xx.xml
DISABLE_GNU_EXTENSIONS)

add_bsp_based_executable(
NAME EmbeddedProject1_bool
SOURCES EmbeddedProject1_bool.c system_stm32f4xx.c stm32f4xx_hal_conf.h
GENERATE_BIN
GENERATE_MAP
OUTPUT_RELOCATION_RECORDS)

 

Is there any way to fix that?

 

Regards,

Tianyi

• This topic was modified 1 month ago by wtywtykk.

[support]

Hi,

This happens due to different default language standards between GCC/Clang. The easiest way to fix it is to explicitly select the C23 language standard in the project properties.

For CMake, that would be Target properties -> C/C++ -> Advanced -> Language Standard for C files -> C23, or directly in CMakeLists.txt:

set_property(TARGET EmbeddedProject1_bool PROPERTY C_STANDARD 23)

[wtywtykk]

Thanks, it works!

[Author]

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