[fpc-devel] Linux compilation question

[J. Gareth Moreton]

The only thing I've managed to run so far 
is the standard "make all". What's 
mysterious though is that if I grab a 
clean copy from the trunk, it builds fine. 
However, if I do "make clean" first, that 
error appears. Does anyone else get this? 
(I'm using Ubuntu and compiling on x86_64)

I managed to get an assembly dump of 
system.pp and compare the output between 
ppc1, ppc2 and ppc3. Some procedures in 
ppc3 look very different, as if compiled 
by an older version of the compiler. It's 
confusing, but I'll keep at it.

I don't want to scrap my changes, because 
so far I've managed to make -O3 about 15% 
faster.

Gareth aka. Kit

On Sat 01/12/18 09:05 , "Florian Klämpfl" 
florian at freepascal.org sent:
> Am 30.11.2018 um 14:39 schrieb J. Gareth 
Moreton:
> 
> > Hi everyone,
> 
> > 
> 
> > I have a little question.  I'm having
> problems compiling fpc under x86_64-
linux.  At first I thought it was
> a bug in one
> > of my changes, but it seems to occur 
on the
> trunk as well.  After successfully 
compiling the compiler a few times,
> the
> > following happens:
> 
> > 
> 
> > /usr/bin/diff ppc3 ppcx64
> 
> > Binary files ppc3 and ppcx64 differ
> 
> > 
> 
> > And then it drops out.  I've tried the
> usual things of doing a "make 
distclean", but am I missing
> something obvious? 
> 
> 
> This means that the compiler generates 
wrong code which results in wrong
> code generation :). These things are 
very hard
> to debug. The only way is to compare the 
disassembly manually to find out
> where it differs and then to debug why 
it
> generates this particular code at that 
location.
> 
> 
> 
> > Preliminary Linux testing is the only 
thing I'm
> missing before I'm ready to present a 
patch.
> 
> 
> Did you run regression tests?
> 
> 
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