Undefined symbols: "_strpos", referenc... (on Mac)

[jeanluca]

Hi All

I'm trying to build a shared object (dylib), but when compiling I get the following:

$ make
gcc -fPIC -c libmyconfig.c  -o libmyconfig.o
gcc -Wall -g -fast -dynamiclib -current_version 1.0 -o libmyconfig.dylib libmyconfig.o
Undefined symbols:
  "_strpos", referenced from:
      _load_config_file in libmyconfig.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
make: *** [libmyconfig.dylib] Error 1

It has everything todo with the strpos:

#include <stddef.h>
#include <stdlib.h>
#include <regex.h>
#include <stdio.h>
#include <string.h>
....
...
          char line [ 128 ]; /* or other suitable maximum line size */
	  ...   
	  while(fgets(line, sizeof(line), fp) != NULL)
	   { 
              int pos = strpos(line, '=') ;

if I remove the last line, everything compiles fine. Furthermore, on Linux I don't have any problems

$ make linux
gcc -fPIC -c libmyconfig.c  -o libmyconfig.o
gcc -shared -o libmyconfig.so.1.0 -lc libmyconfig.o 
ldconfig -v -n .
.:
	libmyconfig.so.1.0 -> libmyconfig.so.1.0
ln -sf libmyconfig.so.1.0 libmyconfig.so
Library libmyconfig.so created

Any suggestions what might be the problem on my mac (osx 10.5, i686-apple-darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5465) ?

thnx
LuCa

ps if more info is needed please let me know, because this problem really stopped me

[Codeplug]

strpos is non-standard - so you can't rely on it being available (or the same) from one system to the next.

You could write your own version using strchr as a helper.

gg

[jeanluca]

thnx a lot!!!

How can I tell if something is standard or not ?

[tabstop]

The man page will say what standards (if any) the function adheres to.

[matsp]

thnx a lot!!!

How can I tell if something is standard or not ?

Looking up the standard spec, or in most cases, the online documentation with your IDE (or similar) will tell you what standard(s) the function complies to.

--
Mats

[jeanluca]

thnx again!!