Cortex M-0 compilation with GCC > 5

This forum is dedicated to feedback, discussions about ongoing or future developments, ideas and suggestions regarding the ChibiOS projects are welcome. This forum is NOT for support.
elagil
Posts: 73
Joined: Tue Sep 19, 2017 7:38 am
Has thanked: 6 times
Been thanked: 5 times

Cortex M-0 compilation with GCC > 5

Postby elagil » Tue Mar 31, 2020 9:52 am

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

User avatar
Giovanni
Site Admin
Posts: 13008
Joined: Wed May 27, 2009 8:48 am
Location: Salerno, Italy
Has thanked: 742 times
Been thanked: 620 times
Contact:

Re: Cortex M-0 compilation with GCC > 5

Postby Giovanni » Tue Mar 31, 2020 10:20 am

Hi,

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

Giovanni

elagil
Posts: 73
Joined: Tue Sep 19, 2017 7:38 am
Has thanked: 6 times
Been thanked: 5 times

Re: Cortex M-0 compilation with GCC > 5

Postby elagil » Tue Mar 31, 2020 10:24 am

Ok, that is unfortunate. Thanks for the information!

User avatar
Giovanni
Site Admin
Posts: 13008
Joined: Wed May 27, 2009 8:48 am
Location: Salerno, Italy
Has thanked: 742 times
Been thanked: 620 times
Contact:

Re: Cortex M-0 compilation with GCC > 5

Postby Giovanni » Fri Jun 05, 2020 6:49 am

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


Return to “Development and Feedback”

Who is online

Users browsing this forum: No registered users and 2 guests