[ARM cortex-m0] sync built-in functions for atomic memory access

[Mallikarjun Goudar]

Hi,
I would like to use sync built-in functions for atomic memory access
fro the target arm cortex-m0.
But i do get error when i use them.

For example:
int main(void)
{
int x = 2;
__sync_add_and_fetch(&x, 1);

return x;
}


I get following error:
undefined reference to `__sync_add_and_fetch_4'

I used following command:
arm-none-eabi-gcc -mcpu=cortex-m0 -mthumb -mfloat-abi=soft -c test.c

Thanks for your help,
Mallikarjuna

[Sandeep Kumar Singh]

Hi Mallikarjun,

Post by Mallikarjun Goudar
arm-none-eabi-gcc -mcpu=cortex-m0 -mthumb -mfloat-abi=soft -c test.c

I built toolchain with gcc-4.9.0 source code and I just ran your test case with your used provided
Command. It is running without any error.

Regards,
Sandeep Kumar Singh
Senior Technical member staff, AESBU - Infotainment & Clusters
KPIT Technologies Limited
Phone: [phone] | cell: [phone]

[Mallikarjun Goudar]

Hi Sandeep,
Thanks for the information. I will try with 4.9.0. Previously i was
using 4.7.3 gcc tools.

//mallikarjuna