-std=c++11 or -std=gnu++0x

[Christopher Dawes]

Hi there, my code uses a load of tr1 undefined maps for example so i 
need to use the newer functions however trying to link is not working; 
i've reduced the code to the following simple example (there are many 
more functions that don't in fact link but assuming they are all related 
to single cause):

/* isalnum example */
#include <stdio.h>
#include <ctype.h>
#include <string>

int main ()
{
   int i;
   char str[]="c3po...";
   i=0;
   while (isalnum(str[i])) i++;
   printf ("The first %d characters are alphanumeric.\n",i);
   return 0;
}

I installed and activated mac ports as follows:
sudo port install libgcrypt
sudo port install gcc48 +universal
sudo port select --set gcc mp-gcc48
hash gcc
gcc --version
sudo port install wxWidgets-3.0 +universal
sudo port select --set wxWidgets wxWidgets-3.0
hash wx-config
sudo port install psqlODBC postgresql92 postgresql92-server
sudo port install pgAdmin3
sudo mkdir -p /opt/local/var/db/postgresql92/defaultdb
sudo chown postgres:postgres /opt/local/var/db/postgresql92/defaultdb
sudo su postgres -c '/opt/local/lib/postgresql92/bin/initdb -D 
/opt/local/var/db/postgresql92/defaultdb'
sudo launchctl load -w 
/Library/LaunchDaemons/org.macports.postgresql92-server.plist

Now trying to compile gives:
chrisd$ g++ -std=c++11 -o test test.cpp
Undefined symbols for architecture x86_64:
   "isalnum(int)", referenced from:
       _main in ccDuU6gp.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status

g++ -std=gnu++0x -o test test.cpp
Undefined symbols for architecture x86_64:
   "isalnum(int)", referenced from:
       _main in cc63DZ6i.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status

it's no good trying to change architecture:

g++ -arch i386 -std=gnu++0x -o test test.cpp
Undefined symbols for architecture i386:
   "isalnum(int)", referenced from:
       _main in ccNfChK7.o
ld: symbol(s) not found for architecture i386
collect2: error: ld returned 1 exit status


Any help would be much appreciated. Thanks

Christopher

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