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Re: pow10

From: Andreas Jaeger
Subject: Re: pow10
Date: Tue, 25 Jun 2002 07:03:39 +0200
User-agent: Gnus/5.090007 (Oort Gnus v0.07) XEmacs/21.4 (Artificial Intelligence, i386-suse-linux)

Sam Halliday <address@hidden> writes:

> hello there,
> i feel a bit bad emailing this to you as you will most likely have many more 
> important things to do... and i certainly feel worse that it is is bugs email 
> address, im sure this is just my stupidity...
> i am running glibc-2.2.5 on a Linux from Scratch system, and in one of my c 
> programs i am trying to call pow10(), but i always get
> warning: implicit declaration of function `pow10'

> despite that i have included math.h as usual... am i using the wrong header 
> file? i have gcc-2.95.3
> a grep reveals that it is in a header file
> /usr/include/bits/mathcalls.h:102:__MATHCALL (pow10,, (_Mdouble_ __x));

Look closer and read the manual:
#ifdef __USE_GNU
/* A function missing in all standards: compute exponent to base ten.  */
__MATHCALL (exp10,, (_Mdouble_ __x));
/* Another name occasionally used.  */
__MATHCALL (pow10,, (_Mdouble_ __x));

define _GNU_SOURCE and you're fine.  Never define any __USE* macro

 Andreas Jaeger
  SuSE Labs address@hidden
   private address@hidden

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