From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org
Subject: [Bug 60749] New: Do not need to link against -lm for fabs*()
Date: Thu, 15 Aug 2013 20:36:52 +0000
Message-ID: <bug-60749-11311@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=60749

            Bug ID: 60749
           Summary: Do not need to link against -lm for fabs*()
           Product: Documentation
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: low
          Priority: P1
         Component: man-pages
          Assignee: documentation_man-pages-ztI5WcYan/vQLgFONoPN62D2FQJk+8+b@public.gmane.org
          Reporter: orion-CVdf0l11yl+B+jHODAdFcQ@public.gmane.org
        Regression: No

>>From the fabs(3) man page:

SYNOPSIS
       #include <math.h>

       double fabs(double x);
       float fabsf(float x);
       long double fabsl(long double x);

       Link with -lm.


At least on RHEL5+ one does not appear to need to link with -lm.

# cat fabs.c
#include <math.h>
#include <stdlib.h>
#include <stdio.h>

int main(int argc, char **argv)
{
   printf("%f\n",fabs(atof(argv[1])));
   printf("%f\n",fabsf((float)atof(argv[1])));
   printf("%Lf\n",fabsl((long double)atof(argv[1])));
   return 0;
}
# gcc -g -Wall fabs.c
# ./a.out -2.5
2.500000
2.500000
2.500000
# gcc -v
Using built-in specs.
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--enable-checking=release --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-libgcj-multifile
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk
--disable-dssi --disable-plugin
--with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --with-cpu=generic
--host=x86_64-redhat-linux
Thread model: posix
gcc version 4.1.2 20080704 (Red Hat 4.1.2-54)

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