[fpc-devel] What is the status of -CfLIBGCC ? Can ib be considered good/working for embedded targets?

[Michael Ring]

Thanks,

so I will try to have some fun with debugging softfp, 'fortuately' the 
first issue manifested itself in multiplying two numbers, may the gods 
of gdb smile on me!

Michael

Am 14.02.2021 um 14:19 schrieb Florian Klämpfl via fpc-devel:
> Am 14.02.21 um 14:08 schrieb Michael Ring via fpc-devel:
>> I am having a lot of (no-)fun with floating point on Cortex-M0, 
>> current summary would be to say that things get pretty unreliable 
>> once I start using Floats.
>>
>> I today stumbled over -CfLIBGCC, sounds interesting, but compiling 
>> cross-compiler trunk with this option ends up in an error:
>>
>>
>> /Library/Developer/CommandLineTools/usr/bin/make -C embedded all
>> /Users/ring/fpcupdeluxe-embedded/fpc/bin/x86_64-darwin/ppcarm 
>> -Cparmv6m -Ur -Tembedded -Parm -XParm-none-eabi- -Ur -Xs -O2 -n 
>> -Fi../inc -Fi../arm 
>> -FD/Users/ring/fpcupdeluxe-embedded/fpc/bin/x86_64-darwin -FE. 
>> -FU/Users/ring/devel/freepascal/rtl/units/arm-embedded 
>> -vw-n-h-l-d-u-t-p-c- -ap 
>> -Fl/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib -darm 
>> -dRELEASE -O1 -g -Cflibgcc  -Us -Sg system.pp @system.cfg
>> system.inc(426,5) Fatal: Internal error 200312126
>> Fatal: Compilation aborted
>>
>> Is the option worth asking for a fix so that it compiles again or is 
>> it anyway so experimental that I better try to find the issues within 
>> softfp?
>
> libgcc was never really usable on any target. softfpu works very well 
> on most targets, so it is most likely a simple armv6m issue. I propose 
> we hunt the armv6m issue down, it is probably just a simple cg issue 
> which surfaces by the softfloat code.
> _______________________________________________
> fpc-devel maillist  -  fpc-devel at lists.freepascal.org
> https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel