[Coin-discuss] Build failure from current CVS source on SuSE 9.1 AMD64 platform with fix

[Laszlo Ladanyi]

Yes, Matt is right, he fixed it, I have modified something else in
Makefile.Linux. But it is still a problem that while g++ 3.x supports the
x86_64 platform (definitely 3.2 and above), only 3.4 and above supports the
-march=k8 specification. Before that the best one could ask for was
-march=athlon or something like that. So, what's the right thing to do?

--Laci

On Thu, 12 May 2005, Matthew Saltzman wrote:

> On Thu, 12 May 2005, Laszlo Ladanyi wrote:
> 
> > Hi Clint,
> >
> > I have modified the makefile and put k8 there (if the arch is x86_64), but
> > that is still not perfect, since k8 is available only from g++-3.4 and up. I'm
> > not sure what's the best solution since at that point the version of g++
> > is not known. I suppose one could do a $(shell g++ -v) and parse the
> > result... Any other suggestion?
> 
> Do earlier versions of gcc support x86_64 with some other parameter?  If 
> not, then it's a pretty safe bet that if ARCH=x86_64 then -march=k8 is the 
> right thing to do for gcc.
> 
> BTW, I thought I had patched this back in January (Makefile.Linux v1.11 
> and 1.12).
> 
>  		Matt
> >
> > --Laci
> >
> >
> > On Wed, 12 Jan 2005, Clint wrote:
> >
> >> The default CVS checkout of the Cbc (and dependent) modules fails to
> >> compile on SuSE 9.1 AMD64 platform.  I checked out the source for the
> >> Cbc module via cvs and make failed with the following errors:
> >>
> >> cc1plus: error: bad value (x86_64) for -march= switch
> >>
> >> I traced this down to COIN/Makefiles/Makefile.linux, where
> >>
> >> ARCH=$(shell arch)
> >>
> >> is passed on to
> >>
> >> CXXFLAGS += -march=$(ARCH)
> >>
> >> On the AMD64 platform, ARCH=x86_64, however this is not a correct
> >> argument to -march in GCC.  I hardcoded
> >>
> >> ARCH=k8
> >>
> >> into Makefile.linux and make proceeded normally.  This is obviously
> >> not a permanent fix, but I just wanted to report the bug.
> >>
> >> - clint
> 
> -- 
>  		Matthew Saltzman
> 
> Clemson University Math Sciences
> mjs AT clemson DOT edu
> http://www.math.clemson.edu/~mjs
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