New to C, "Undefined reference's"

Hi, I am trying to compile a sample program using gcc. The program
requires headers so I put the header files and corresponding source
files into one folder. Then I ran the command 'gcc prog.c -o
prog.exe.' It then gives me errors such as "undefined reference to
'_N_VNew'" where N_VNew is in the header files I put in the folder.
Usually gcc file.c -o file.exe worked for a c program that include no
user defined headers. I've never dealt with headers before, is there
some gcc command I need to use? btw, I doubt there is a problem in the
source code calling the headers.

Thank You

steve said:

Quote:

Hi, I am trying to compile a sample program using gcc. The program
requires headers so I put the header files and corresponding source
files into one folder. Then I ran the command 'gcc prog.c -o
prog.exe.' It then gives me errors such as "undefined reference to
'_N_VNew'" where N_VNew is in the header files I put in the folder.
Usually gcc file.c -o file.exe worked for a c program that include no
user defined headers. I've never dealt with headers before, is there
some gcc command I need to use? btw, I doubt there is a problem in the
source code calling the headers.

You have asked question 13.25 in the comp.lang.c FAQ, which can be found at
http://c-faq.com/

--
Richard Heathfield <http://www.cpax.org.uk>
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

Can someone give me an example, for instance, if I declare #include
"aheader.h" in my program and aheader.h is in the same folder of
myprog.c. I am in windows so I want to essentially run gcc myprog.c -o
myprog.exe to make an exe file.

Thank You

steve said:

Quote:

Can someone give me an example, for instance, if I declare #include
"aheader.h" in my program and aheader.h is in the same folder of
myprog.c. I am in windows so I want to essentially run gcc myprog.c -o
myprog.exe to make an exe file.

This is not a header issue, as the FAQ I told you about should have made
abundantly clear to you. "Undefined reference" generally means you've
forgotten to link a library (although that is not the only possible cause
of that message, it would seem to be the cause in this case, from what
you've said so far).

--
Richard Heathfield <http://www.cpax.org.uk>
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

steve wrote:

Quote:

Hi, I am trying to compile a sample program using gcc. The program
requires headers so I put the header files and corresponding source
files into one folder. Then I ran the command 'gcc prog.c -o
prog.exe.' It then gives me errors such as "undefined reference to
'_N_VNew'" where N_VNew is in the header files I put in the folder.

The header only contains the declaration of that type. The definition is
in some library. There's a FAQ which is relevant to this.

By the way, you have a Greengrocer's apostrophe in your subject. Plurals
do not generally require apostrophes.

New to C, "Undefined reference's"

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