Disclaimer: This page is being maintained mainly for my students. Use these instructions at your own risk. There is no warranty in any form or shape whatsoever!. There is no guarantee that these instructions are up-to-date. With that understood you may continue with the rest of this page if you choose to accept these terms.
This page was last updated on September 13, 2005, but still good as of November 16, 2015.
Follow these steps to install g++ (the GNU C++ compiler) for Windows. There is no room for creativity here; you must follow the directions exactly.
C:\cygnus\cygwin-b20\H-i586-cygwin32\binYou now should add it to the PATH environment variable. You do that by following:
Start -> Control Panel -> System -> Advanced -> Environment VariablesAt this point you can see the PATH variable either in the User Variables or in the System Variables. Add the g++ path into the PATH variable. You add it to the end of the existing value separated by a semicolon (';'). Make sure that you do not lose the original value. You are just appending more to the end separated by a semicolon.
You should now be able to run g++ from a DOS command prompt window. For example, to compile a file called C:\mine\hello.cpp, connect to the C:\mine folder and enter
g++ -g hello.cpp -o hello -lmYou'll then be able to run the compiled program by entering hello in the DOS command prompt window.
If you've installed Emacs as described here, you will also be able to run g++ from Emacs. If, when you do this, Emacs tries to compile with the command make -k, you made a mistake during the Emacs installation. (If you try to compile a C program, e.g., hello.c instead of a C++ program, e.g., hello.cpp, it will try make -k. In that case enter the compile command, gcc -g hello.c -o hello -lm, manually. After you try it manually once, from second time on it will do the right thing automatically.) If you want to learn how to run g++ on emacs, see here.
If you'd like to learn more about where this free compiler came from, we downloaded it from an older site of http://sourceware.org/cygwin/.
If you wish to clean up a little, you may delete the file: full.exe at this point. Your g++ compiler is installed under C:\cygnus.