Re: difference between Cygwin & Linux GNU Make 3.8?

[Paul D. Smith]

%% "Fred J." <address@hidden> writes:

  fj> may be I can explain it much better.
  fj> I get errors when I '$make' as below

  fj> BTW; no error if I run the same in Cygwin under windows, the error
  fj> happens using a linux box kernel 2.6.8 and both boxes have GNU
  fj> Make 3.80

  fj> //////////////////////ERROR//////////////////////////////
  fj> g++ ExternalSort.cc -DNDEBUG -Wall -I../lib -L../lib
  fj> -ltools -o ExternalSort
  fj> ../lib/libtools.a(Tools.o)(.text+0x3416): In function
  fj> `Tools::SharedLock::SharedLock[not-in-charge](_pthread_rwlock_t*)':
  fj> : undefined reference to `pthread_rwlock_rdlock'
  fj> //////////////////////////////////////////////////////////

I'm not sure why you think this is a problem with make.

You are not including the libraries you need, so you're getting an
undefined error from your linker.  It has nothing to do with make: make
is doing exactly what you asked it to do.

On Linux, the pthread_* functions are in the pthread library, so add
-lpthread to your link line to link that in.  You may or may not also
need -lrt for other realtime functions.


If you still have problems please ask on a Linux developer's newsgroup
or mailing list.

Good luck!

-- 
-------------------------------------------------------------------------------
 Paul D. Smith <address@hidden>          Find some GNU make tips at:
 http://www.gnu.org                      http://make.paulandlesley.org
 "Please remain calm...I may be mad, but I am a professional." --Mad Scientist