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math.h problem

From: "Anant Aneja" <anantaneja at rediffmail dot com>
To: gcc-help at gcc dot gnu dot org
Date: 13 Jan 2003 15:24:53 -0000
Subject: math.h problem
Reply-to: "Anant Aneja" <anantaneja at rediffmail dot com>

Hi all,
I recently instatalled gcc version 2.96 on my Pentium 2 350 Mhz running PCQLinux (just
Red Hat 7.1 renamed)

I could get string.h,ctype.h to work but am havin problems with math.h

I by chance stumbled to a query posted in Aug 2001 reagarding a similar problem with math.h
I read ur reply and so am supplying u with all the details. Tell me what is wrong.

file mtest.c :
------mtest.c--------------
#include <math.h>

int main(void)
{
double n;

n = sqrt(2);
return (int)n - 1;
}
----------------------------

command run :
gcc -v mtest.c -o mtest

o/p:
---------Starts----------
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-81)
/usr/lib/gcc-lib/i386-redhat-linux/2.96/cpp0 -lang-c -v -D__GNUC__=2 -D__GNUC_M
INOR__=96 -D__GNUC_PATCHLEVEL__=0 -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__
-D__linux__ -D__unix -D__linux -Asystem(posix) -Acpu(i386) -Amachine(i386) -Di38
6 -D__i386 -D__i386__ -D__tune_i386__ mtest.c /tmp/ccBL7IJ3.i
GNU CPP version 2.96 20000731 (Red Hat Linux 7.1 2.96-81) (cpplib) (i386 Linux/E
LF)
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/usr/i386-redhat-linux/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc-lib/i386-redhat-linux/2.96/include
/usr/include
End of search list.
/usr/lib/gcc-lib/i386-redhat-linux/2.96/cc1 /tmp/ccBL7IJ3.i -quiet -dumpbase mt
est.c -version -o /tmp/cc1gOa36.s
GNU C version 2.96 20000731 (Red Hat Linux 7.1 2.96-81) (i386-redhat-linux) comp
iled by GNU C version 2.96 20000731 (Red Hat Linux 7.1 2.96-81).
as -V -Qy -o /tmp/ccu4nMfe.o /tmp/cc1gOa36.s
GNU assembler version 2.10.91 (i386-redhat-linux) using BFD version 2.10.91.0.2
/usr/lib/gcc-lib/i386-redhat-linux/2.96/collect2 -m elf_i386 -dynamic-linker /l
ib/ld-linux.so.2 -o mtest /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../crt1.
o /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../crti.o /usr/lib/gcc-lib/i386-
redhat-linux/2.96/crtbegin.o -L/usr/lib/gcc-lib/i386-redhat-linux/2.96 -L/usr/li
b/gcc-lib/i386-redhat-linux/2.96/../../.. /tmp/ccu4nMfe.o -lgcc -lc -lgcc /usr/l
ib/gcc-lib/i386-redhat-linux/2.96/crtend.o /usr/lib/gcc-lib/i386-redhat-linux/2.
96/../../../crtn.o
/tmp/ccu4nMfe.o: In function `main':
/tmp/ccu4nMfe.o(.text+0x11): undefined reference to `sqrt'
collect2: ld returned 1 exit status

----------Ends------------

command :
gcc -v mtest.c -o mtest.i -E

o/p:
----------Starts------------
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-81)
/usr/lib/gcc-lib/i386-redhat-linux/2.96/cpp0 -lang-c -v -D__GNUC__=2 -D__GNUC_M
INOR__=96 -D__GNUC_PATCHLEVEL__=0 -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__
-D__linux__ -D__unix -D__linux -Asystem(posix) -Acpu(i386) -Amachine(i386) -Di38
6 -D__i386 -D__i386__ -D__tune_i386__ mtest.c /tmp/ccBL7IJ3.i
GNU CPP version 2.96 20000731 (Red Hat Linux 7.1 2.96-81) (cpplib) (i386 Linux/E
LF)
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/usr/i386-redhat-linux/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc-lib/i386-redhat-linux/2.96/include
/usr/include
End of search list.
/usr/lib/gcc-lib/i386-redhat-linux/2.96/cc1 /tmp/ccBL7IJ3.i -quiet -dumpbase mt
est.c -version -o /tmp/cc1gOa36.s
GNU C version 2.96 20000731 (Red Hat Linux 7.1 2.96-81) (i386-redhat-linux) comp
iled by GNU C version 2.96 20000731 (Red Hat Linux 7.1 2.96-81).
as -V -Qy -o /tmp/ccu4nMfe.o /tmp/cc1gOa36.s
GNU assembler version 2.10.91 (i386-redhat-linux) using BFD version 2.10.91.0.2
/usr/lib/gcc-lib/i386-redhat-linux/2.96/collect2 -m elf_i386 -dynamic-linker /l
ib/ld-linux.so.2 -o mtest /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../crt1.
o /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../crti.o /usr/lib/gcc-lib/i386-
redhat-linux/2.96/crtbegin.o -L/usr/lib/gcc-lib/i386-redhat-linux/2.96 -L/usr/li
b/gcc-lib/i386-redhat-linux/2.96/../../.. /tmp/ccu4nMfe.o -lgcc -lc -lgcc /usr/l
ib/gcc-lib/i386-redhat-linux/2.96/crtend.o /usr/lib/gcc-lib/i386-redhat-linux/2.
96/../../../crtn.o
/tmp/ccu4nMfe.o: In function `main':
/tmp/ccu4nMfe.o(.text+0x11): undefined reference to `sqrt'
collect2: ld returned 1 exit status
[anant@aneja anant]$ cat > op.txt
[anant@aneja anant]$ gcc -v mtest.c -o mtest
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-81)
/usr/lib/gcc-lib/i386-redhat-linux/2.96/cpp0 -lang-c -v -D__GNUC__=2 -D__GNUC_M
INOR__=96 -D__GNUC_PATCHLEVEL__=0 -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__
-D__linux__ -D__unix -D__linux -Asystem(posix) -Acpu(i386) -Amachine(i386) -Di38
6 -D__i386 -D__i386__ -D__tune_i386__ mtest.c /tmp/ccBL7IJ3.i
GNU CPP version 2.96 20000731 (Red Hat Linux 7.1 2.96-81) (cpplib) (i386 Linux/E
LF)
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/usr/i386-redhat-linux/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc-lib/i386-redhat-linux/2.96/include
/usr/include
End of search list.
/usr/lib/gcc-lib/i386-redhat-linux/2.96/cc1 /tmp/ccBL7IJ3.i -quiet -dumpbase mt
est.c -version -o /tmp/cc1gOa36.s
GNU C version 2.96 20000731 (Red Hat Linux 7.1 2.96-81) (i386-redhat-linux) comp
iled by GNU C version 2.96 20000731 (Red Hat Linux 7.1 2.96-81).
as -V -Qy -o /tmp/ccu4nMfe.o /tmp/cc1gOa36.s
GNU assembler version 2.10.91 (i386-redhat-linux) using BFD version 2.10.91.0.2
/usr/lib/gcc-lib/i386-redhat-linux/2.96/collect2 -m elf_i386 -dynamic-linker /l
[anant@aneja anant]$ gcc -v mtest.c -o mtest.i -E
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-81)
/usr/lib/gcc-lib/i386-redhat-linux/2.96/cpp0 -lang-c -v -D__GNUC__=2 -D__GNUC_M
INOR__=96 -D__GNUC_PATCHLEVEL__=0 -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__
-D__linux__ -D__unix -D__linux -Asystem(posix) -Acpu(i386) -Amachine(i386) -Di38
6 -D__i386 -D__i386__ -D__tune_i386__ mtest.c -o mtest.i
GNU CPP version 2.96 20000731 (Red Hat Linux 7.1 2.96-81) (cpplib) (i386 Linux/E
LF)
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/usr/i386-redhat-linux/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc-lib/i386-redhat-linux/2.96/include
/usr/include
End of search list.

-------------Ends-----------

A similar problem occurs on using iostream.h :

-------iotest.cpp--------
#include <iostream.h>

void main()
{
char a;
cin>>a;
}
-----------Ends------------

on givin :
gcc iotest.cpp i get :
------Starts-----------
/tmp/ccBRsi6r.o: In function `main':
/tmp/ccBRsi6r.o(.text+0xe): undefined reference to `cin'
/tmp/ccBRsi6r.o(.text+0x13): undefined reference to `istream::operator>>(char &)'
collect2: ld returned 1 exit status

----------Ends---------

Basically as u must have noticed the problem is a "undefined refreance to <func. name>"

Hoping u'll help me,
Anant Aneja

anantaneja@rediffmail.com
anantaneja@yahoo.com

Follow-Ups:
- Re: math.h problem
  - From: Fabio Mazzone

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