Cortex-M0 bugs: 88167, 88656

[RadaR]

os/common/ports/ARMCMx/chcore_v6m.h

have check for GCC version

/* Handling a GCC problem impacting ARMv6-M.*/
#if defined(__GNUC__) && !defined(PORT_IGNORE_GCC_VERSION_CHECK)
#if __GNUC__ > 5
#warning "This compiler has a know problem with Cortex-M0, see bugs: 88167, 88656."
#warning "*** Use GCC version 5 or below ***"
#endif
#endif

From 25.10.2019 this bugs was fixed

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88656
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88167

Can you remove\updated this check in trunk version ?

[Giovanni]

It has been fixed on repositories but binary GCC distribution from ARM has still to include the fix, this will likely happen in next release.

The check cannot be removed, it needs to be updated but I need to know unaffected versions in each GCC branch.

Giovanni

[RadaR]

thanks

[FXCoder]

Hi,
88167 & 88656 fixed on 2019-10-25 on all active branches.
GCC active branch releases subsequent to the fix...
GCC 7.5 [2019-11-14]
GCC 8.4 [2020-03-04]
GCC 9.3 [2020-03-12]
--
Bob

[Giovanni]

Thanks Bob,

Waiting the next ARM GCC release now...

Giovanni

[alex31]

For the early testers, a guy maintains a bleeding edge toolchain where one can fin latest gcc 9.3, gdb 9.1 :

http://www.freddiechopin.info/en/downlo ... -toolchain

there is precompiled binaries for windows, but not for linux where there is only a build script.

If someone is interested, here is a link to a linux X64 build that should work on ubuntu (and derivatives like mint) 18.04 and after :

arm-none-eabi-gcc-9.3

I do not have M0 to test if bug is fixed, all i know is that it works for M4 (F4/F7), with significant lower binary size for c++ programs.

Alexandre

[dflogeras]

Giovanni,

In previous situations like this, I've had success doing something like the following:

Code: Select all

#if defined __GNUC__

 #if ( __GNUC__ > 5 ) && ( __GNUC__ < 10 )

  #define GCC_VERSION ( __GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ )
  #if ( __GNUC__ == 7 ) && ( GCC_VERSION >= 70500 )
  #elif ( __GNUC__ == 8 ) && ( GCC_VERSION >= 80400 )
  #elif ( __GNUC__ == 9 ) && ( GCC_VERSION >= 90300 )
  #else
   #warn "Warning about version"
  #endif

 #endif
#endif

[Giovanni]

I see, the problem right now is that the compiler is not yet released.

Giovanni

[dflogeras]

Yup, I just wanted to throw that out there for the future, in case it helps you save some time.

Best,
Dave

[Giovanni]

Hi,

Change committed and fixed as bug #985.

Giovanni