GCC issue 1: We are working on the STM32F0 series, where the src code is in C++ and the compiler used is the GCC ARM (version 4.4.1) which compiles fine. However when we changed the GCC compiler to 4.7.3 we are observing linker issues as below: undefined reference to '_isatty' Can anyone suggest a solution for the same? ***************************************************** GCC issue 2: We are working on the STM32F0 series, where the src code is in C++ and the compiler used is the GCC ARM (version 4.4.1) which compiles fine. We are observing that the compiler is behaving weird while dividing variables. i.e. var1 = var2/2 => OK var1 = var2/3 => FAIL! (runtime issue, compiles fine) var1 = var2/8 => OK var1 = var2/6 => FAIL! (runtime issue, compiles fine) Seems it behaves weird for some specific values of the divider. We have verified the issue thru thorough testing so theres no doubt left about the observation. Now we are trying to find a soln/workaround for the same. Any such experiences with the GCC ARM compiler would be helpful.
Sujit P. wrote: > Can anyone suggest a solution for the same? Define an empty dummy function:
1 | void _isatty () {} |
, compile & link. Then disassemble the code and see where it used, and remove that code. Sujit P. wrote: > var1 = var2/8 => OK This will be optimized to a bitshoft (var2 >> 3) > var1 = var2/6 => FAIL! (runtime issue, compiles fine) Did you specify the correct ARM Core (Cortex-M0)? That core does not have a hardware division unit, you have to ensure the compiler generates software division code.
Hi, can any one have a working CPP template. so that i can use that as an example to proceed.
You don't need a "CPP template", you need a "project template". Correct compiler options and linker file etc. Since you not even replied to the question which core you're using, it's obviously not very urgent, and you'll be fine after taking your time reading the documentation.
Watch this topic
Disable multi-page viewPlease log in before posting. Registration is free and takes only a minute.
Existing account
Do you have a Google/GoogleMail account? No registration required!
Log in with Google account
Log in with Google account
No account? Register here.