graphviz port build fails on alpha FBSD 6.3

[Anton Shterenlikht]

On Thu, Jul 10, 2008 at 03:56:10PM +0100, Anton Shterenlikht wrote:
> On Thu, Jul 10, 2008 at 03:37:53PM +0100, Anton Shterenlikht wrote:
> > On Thu, Jul 10, 2008 at 01:55:48PM +0000, Christian Weisgerber wrote:
> > > Anton Shterenlikht <mexas at bristol.ac.uk> wrote:
> > > 
> > > >    6931 configure:9309: cc -o conftest -O -pipe -mcpu=ev6 -mieee
> > > > 	-Wstrict-prototypes -Wpointer-arith -Wall -ffast-math
> > > > 	-I/usr/local/include -I/usr/local/include
> > > > 	-L/usr/local/lib -L/usr/local/lib conftest.c  >&5
> > > >    6932 conftest.c:86: warning: function declaration isn't a prototype
> > > >    6933 conftest.c:96: warning: function declaration isn't a prototype
> > > >    6934 /usr/lib/crtfastmath.o(.text+0x1c): In function `set_fast_math':
> > > >    6935 : undefined reference to `__ieee_set_fp_control'
> > > 
> > > -ffast-math isn't supported on alpha.  Don't use it.  Ports that
> > > unconditionally use it need to be fixed.
> > 
> > Naddy thanks, just in time!
> > I was just discussing this with the port maintainer.
> > Actually if I put
> > 
> > 	CFLAGS= -O -pipe -ffast-math
> > 
> > in /etc/make.conf I get stopped at the config stage:
> > 
> >         configure:3832: error: C compiler cannot create executables
> > 
> > I cannot find much info on -ffast-math. Could you please expand on your
> > answer.
> 
> Found it, should've looked better, sorry.
> 
> >From gcc man pages:
> 
>        -ffast-math
>            Sets -fno-math-errno, -funsafe-math-optimizations, -fno-trap-
>            ping-math, -ffinite-math-only, -fno-rounding-math and -fno-signal-
>            ing-nans.
> 
>            This option causes the preprocessor macro "__FAST_MATH__" to be
>            defined.
> 
>            This option should never be turned on by any -O option since it can
>            result in incorrect output for programs which depend on an exact
>            implementation of IEEE or ISO rules/specifications for math func-
>            tions.
> 
> plus PR ports/113599: graphics/dri: fix build on alpha
> http://www.FreeBSD.org/cgi/query-pr.cgi?pr=113599
> 
> 	FreeBSD/alpha can't handle -ffast-math (fails to link due to some
> 	unimplemented functions), so don't try to build graphics/dri with
> 	that option there.
> 
> 
> I'll try your solution and add
> 
> .if ${ARCH} == alpha
> 	FAST_MATH=
> .else
> 	FAST_MATH=      -ffast-math
> .endif
> 
> to the Makefile
> 
> Will report on results.

no, adding this to Makefile doesn't help. It is being ignored, e.g.:

	cc -DHAVE_CONFIG_H -I. -I../.. -I../../lib/ast -I../../lib/sfio
	-I/usr/local/include -I/usr/local/include -O -pipe -mcpu=ev6 -mieee
	-Wstrict-prototypes -Wpointer-arith -Wall
--->	-ffast-math
	-MT vmopen.lo -MD -MP -MF .deps/vmopen.Tpo -c vmopen.c -o vmopen.o
	>/dev/null 2>&1

it must be somewhere in configure.ac probably.

-- 
Anton Shterenlikht
Room 2.6, Queen's Building
Mech Eng Dept
Bristol University
University Walk, Bristol BS8 1TR, UK
Tel: +44 (0)117 928 8233 
Fax: +44 (0)117 929 4423