don't know how compiler supports IEEE math on debian alpha port

[Steffen dot Pelzetter at nexans dot com]

Hello,

this time I try to compile the rrdtool-1.2.15.

But that fails by running the ./configure command.
The following error is logged:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
IEEE Math Checks
checking for fpclassify... no
checking for fpclassify with <math.h>... yes
checking for finite... yes
checking for isinf... yes
checking if IEEE math works out of the box... not isnan(NaN) ... no
checking if IEEE math works with the -ieee switch... no
checking if IEEE math works with the -qfloat=nofold switch... not 
isnan(NaN) ... no
checking if IEEE math works with the -w -qflttrap=enable:zerodivide... not 
isnan(NaN) ... no
checking if IEEE math works with the -mieee switch... not isnan(NaN) ... 
no
checking if IEEE math works with the -q float=rndsngl switch... no
checking if IEEE math works with the -OPT:IEEE_NaN_inf=ON 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)... not isnan(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 (tobi@oetiker.ch).
Check config.log to see what went wrong ...
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I tried 2 compiler versions  3.3.5,  4.1.1 having the same problem.

In config.log I've found the following problem may be related to this

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
configure:22957: checking if IEEE math works with the -mieee switch
configure:23038: gcc -o conftest -g -O2 -fno-strict-aliasing -Wall 
-std=gnu99 -pedantic -Wshadow -Wpointer-arith -Wcast-align 
-Wmissing-prototypes -Wm
issing-declarations -Wnested-externs -Winline -W  -fPIC -DPIC -mieee 
conftest.c -lm  >&5
conftest.c: In function `main':
conftest.c:118: warning: declaration of `nan' shadows a global declaration
/usr/include/bits/mathcalls.h:225: warning: shadowed declaration is here
configure:23041: $? = 0
configure:23043: ./conftest
configure:23046: $? = 1
configure: program exited with status 1
configure: failed program was:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Steffen Pelzetter
Abt.: IT

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