problem linking SHM functions

[Claude dot Barrouil at onera dot fr]

I have a program that uses shared memory functions shmget() and shmat() and 
that works fine under Linux.

My problem is that I couldn't find how to link it with Cygwin, although I 
installed le last full package, cygwin1.dll is in the PATH, any other 
compilations and linkages works fine.

All the info I could find is the thread starting at 
http://www.cygwin.com/ml/cygwin/2002-08/msg01296.html, and the links to 
cygipc and cygserver. But this info does not address this (supposed to be 
trivial) linkage problem.

Where is the relevant info ?

Thanks,
Claude Barrouil

--------------- the relevant part of the codee -----------------
...
#include <cygwin/shm.h>
...
ShmId = shmget(ShmKey, ShmSiz, 0666)
...
SharedData = shmat(ShmId,NULL,0)
...
--------------- the linkage failure-----------------------------
gcc  myprog.c -lm -o myprog.exe
{}/Temp/ccj8s9oV.o(.text+0x67):myprog.c: undefined reference to `_shmget'
{}/Temp/ccj8s9oV.o(.text+0xa3):myprog.c: undefined reference to `_shmat'
collect2: ld returned 1 exit status
---------------- the end ---------------------------------------




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