GCC Compiler problem

[Raju Mathur <raju@xxxxxxxxxxxxxxx>]

Hi Vipin,

1.  rpm -V: ignore the issues in localtime, it has changed since
installation since your localtime is not pointing to Asia/Calcutta (I
hope :)

2.  undefined reference to log: append -lm to the compiler command
line:

        gcc -o p p.c -lm

3.  ld: I normally wouldn't use ld directly to link a program, I'd use
gcc.  IAC your command has a typo (p/usr/lib/libc.a).

Regards,

-- Raju

>>>>> "Vipin" ==   <" <pandeyvip@xxxxxxxxxxxxxx>> writes:

    Vipin> Hi folks I have a problem with the gcc compiler which is
    Vipin> not linking programs that use the functions in <math.h>
    Vipin> standard header. I have tried to Verify the glibc and
    Vipin> glibc-devel packages on my system.  glibc-devel is Ok but
    Vipin> on verifying glibc package gives the following output

    Vipin>  rpm -V glibc S.5....T c /etc/localtime Which stands for
    Vipin> (Error in S = File size, 5 means MD5 Sum, T means Mtime) I
    Vipin> have reinstalled the package glibc but still rpm -V glibc
    Vipin> gives the same error.  As we can see this is a linking
    Vipin> error, probably math.h is not present in C library
    Vipin> properly.  I do not know if this is a bug. Users with RH
    Vipin> 6.2 installed from June2K of PCQ please try to run C code
    Vipin> requiring any function from <math.h> and let me know if it
    Vipin> works or gives error as in my case.


    Vipin> Problem: --------------Start-------------------- gcc -o p
    Vipin> p.c /tmp/ccOk5I48.o: In function `main':
    Vipin> /tmp/ccOk5I48.o(.text 0x1e): undefined reference to `log'
    Vipin> collect2: ld returned 1 exit status [vipin@vipin] ~$ vi p.c
    Vipin> [vipin@vipin] ~$ cat p.c #include<stdio.h> #include<math.h>

    Vipin> main() { double a, b; a=101; b = log(a); return 0;

    Vipin> }

    Vipin> OUTPUT 2
    Vipin> ------------------------------------------------------------------
    Vipin> gcc -c p.c -o p.o [vipin@vipin] ~$ ld -o p/usr/lib/libc.a
    Vipin> p.o -lc ld: cannot open output file p/usr/lib/libc.a: No
    Vipin> such file or directory [vipin@vipin] ~$ ld -o p
    Vipin> /usr/lib/libc.a p.o -lc ld: warning: cannot find entry
    Vipin> symbol _start; defaulting to 08048100 p.o: In function
    Vipin> `main': p.o(.text 0x1e): undefined reference to `log'


    Vipin> Problem ------------End--------------------------


    Vipin> Please help me solve the problem.

-- 
Raju Mathur          raju@xxxxxxxxxxxxx           http://kandalaya.org/