Thanks, that's a nice solution, but unfortunately I forgot to mention that I'm compiling under Windows Vista 64-bit. I've got another solution by using '#line' preprocessor directive to correct paths in error messages. And using additional `-I' switch on the command line for /BBB folder. But I was thinking about some kind of command line switch to do that at once. -----Original Message----- From: Eljay Love-Jensen [mailto:eljay@xxxxxxxxx] Sent: Tuesday, August 19, 2008 1:45 PM To: Seyran Avanesyan; GCC-help Subject: Re: Different working folder for a C/C++ source file Hi Seyran, Try this: cd /AAA for FILE in /BBB/* do if test ! -e $FILE ln -s $FILE fi done g++ -c -o real.o real.cpp HTH, --Eljay