can not figure out the problem

[yezi]

HI, ALL:

I can not figure out the problem with compiling.

the message is "
/tmp/ccAxyQSj.o(.text+0x275): In function `main':
: undefined reference to `sqrt'
collect2: ld returned 1 exit status
"

At first I thought is because the gcc "math.h" do not have the function
: then I type "gcc --version "

gcc (GCC) 3.3.2 20031022 (Red Hat Linux 3.3.2-1)
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is
NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.

Then I use "man sqrt " in my system, it works.

My question : why the compiler failure?

THanks
bin YE

[David Resnick]

yezi wrote:

HI, ALL:

I can not figure out the problem with compiling.

the message is "
/tmp/ccAxyQSj.o(.text+0x275): In function `main':
: undefined reference to `sqrt'
collect2: ld returned 1 exit status
"

At first I thought is because the gcc "math.h" do not have the function
: then I type "gcc --version "

gcc (GCC) 3.3.2 20031022 (Red Hat Linux 3.3.2-1)
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is
NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.

Then I use "man sqrt " in my system, it works.

My question : why the compiler failure?

THanks
bin YE

http://www.eskimo.com/~scs/C-faq/q14.3.html

-David

[yezi]

many thanks , quite right~

[Flash Gordon]

yezi wrote:

HI, ALL:

I can not figure out the problem with compiling.

the message is "
/tmp/ccAxyQSj.o(.text+0x275): In function `main':
: undefined reference to `sqrt'
collect2: ld returned 1 exit status
"

At first I thought is because the gcc "math.h" do not have the function

<snip>

http://www.eskimo.com/~scs/C-faq/q14.3.html

I suggest you read the rest of the FAQ and the manuals for your compiler
& linker as well.
--
Flash Gordon
Living in interesting times.
Although my email address says spam, it is real and I read it.

[Barry Schwarz]

On 28 Nov 2005 13:45:32 -0800, "yezi" <ye*****@hotmail.com> wrote:

HI, ALL:

I can not figure out the problem with compiling.

the message is "
/tmp/ccAxyQSj.o(.text+0x275): In function `main':
: undefined reference to `sqrt'
collect2: ld returned 1 exit status
"
It is not a compiler failure. It is a linker failure. You need to
look at your documentation to determine how to tell the linker it
should use the math library to resolve function references.

At first I thought is because the gcc "math.h" do not have the function
math.h is a header, not a library.
: then I type "gcc --version "

gcc (GCC) 3.3.2 20031022 (Red Hat Linux 3.3.2-1)
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is
NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.

Then I use "man sqrt " in my system, it works.

My question : why the compiler failure?

THanks
bin YE

<<Remove the del for email>>

[manu]

one reason could be you didnot use the -lm clause while compiling.
try that if you haven't used that
gcc -lm <file.c>

this should solve your problem.

[Keith Thompson]

"manu" <ma*************@gmail.com> writes:

one reason could be you didnot use the -lm clause while compiling.
try that if you haven't used that
gcc -lm <file.c>

One reason for what?

Please read <http://cfaj.freeshell.org/google/>.

--
Keith Thompson (The_Other_Keith) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <*> <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.