Cortex M-0 compilation with GCC > 5

[elagil]

Hello,

compiling for Cortex M-0 I get the following warning:

Code: Select all

  
132 | # "*** Use GCC version 5 or below ***"
      |  warning^~~~~~~ "This compiler has a know problem with Cortex-M0, see bugs: 88167, 88656."

However, checking the bug tracker, these bugs seem to be fixed in the current release.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88167
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88656

I use the latest arm gcc, which is dated after the closure of the bugs:
gcc version 9.2.1 20191025 (release) [ARM/arm-9-branch revision 277599] (GNU Tools for Arm Embedded Processors 9-2019-q4-major)

Would it make sense to remove the warning for the new revisions?

Best regards

[Giovanni]

Hi,

The latest released compiler, the one you have, still has the bug.

Giovanni

[elagil]

Ok, that is unfortunate. Thanks for the information!

[Giovanni]

Hi,

I just tried 9.3.1 2020q2 and looking at generated code it seems to be fine, LR register is preserved in the function prologue, later today I will run some tests and change the preprocessor check in the repository.

The new compiler also supports Cortex-A now, which is very nice.

Giovanni