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rrdtool - IEEE math not supported by gcc?
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Klavs
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Joined: 22 May 2002
Posts: 536
Location: Denmark

PostPosted: Fri Oct 11, 2002 10:24 am    Post subject: rrdtool - IEEE math not supported by gcc? Reply with quote

Hi guys,

I'm trying to compile rrdtool on my via C3 system (with gcc-3.2) and gets this output:

checking for fpclassify with <math.h>... no
checking for finite... yes
checking for isinf... yes
checking if realloc can deal with NULL... yes
checking if IEEE math works out of the box... nan == nan ... no
checking if IEEE math works with the -ieee switch... no
checking if IEEE math works with the -qfloat=nofold switch... nan == nan ... no
checking if IEEE math works with the -w -qflttrap=enable:zerodivide... nan == nan ... no
checking if IEEE math works with the -mieee switch... no
checking if IEEE math works with the -q float=rndsngl switch... no
checking if IEEE math works with the -OPT:IEEE_comparisons=ON switch... no
checking if IEEE math works with fpsetmask(0)... no
checking if IEEE math works with signal(SIGFPE,SIG_IGN)... nan == nan ... no
configure: error:
Your Compiler does not do propper IEEE math ... Please find out how to
make IEEE math work with your compiler and let me know (oetiker@ee.ethz.ch).
Check config.log to see what went wrong ...

do you guys have any clue whats up here?
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Klavs Klavsen
Denmark

Working with Unix is like wrestling a worthy opponent.
Working with windows is like attacking a small whining child
who is carrying a .38.
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Klavs
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Joined: 22 May 2002
Posts: 536
Location: Denmark

PostPosted: Fri Oct 11, 2002 10:41 am    Post subject: Reply with quote

I got an answer from tobias oetiker:

you that you have to figure out how to
compile the test code in configure.in propperly ...

any ideas how I should go on, doing that?

I read some posts about a -miee compile option helping sun users.. but that's it.

Could this have anything to do with my current compile flags:
CFLAGS="-march=i586 -m3dnow -O3 -pipe -fomit-frame-pointer -ffast-math -funroll-loops -fforce-addr -falign-function
s=4"

Thankyou in advance.
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Klavs Klavsen
Denmark

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Klavs
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Joined: 22 May 2002
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PostPosted: Fri Oct 11, 2002 10:52 am    Post subject: Reply with quote

rrdtool-1.3.9 compiled fine with the following flags:

-march=i586 -02 -pipe

guess I was just optimizing too much :-)
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Klavs Klavsen
Denmark

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flow23
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Joined: 29 Nov 2002
Posts: 9
Location: Köln, Germany

PostPosted: Sun Mar 16, 2003 5:52 pm    Post subject: I Know this is old Reply with quote

Just found it today and wanted to add my 2 cents:

For me it didn't compile with:
CFLAGS=-O3 -mcpu=pentium3 -march=i686 -ffast-math -fomit-frame-pointer -mmmx -msse -pipe

but compiled with:
CFLAGS=-O3 -mcpu=pentium3 -march=i686 -fomit-frame-pointer -mmmx -msse -pipe

so it seems to be the -ffast-math optimization.
Greetings from Cologne, Germany
fLOW
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kozmic
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Joined: 29 Oct 2002
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PostPosted: Sun Jul 20, 2003 3:00 am    Post subject: Reply with quote

Thanks.

Removing --ffast-math helped me getting rrdtool installed.
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