MinGW means Minimalist GNU for Windows: GNU is a source of open source programming tools (GNU stands for GNU is Not Unix). In this handout you will download the files needed by GNU C; in the next you will download a version of Eclipse that is already set up to use MinGW. A development environment used for the creation of open source programs for Windows.

(These are different than the compilers included with Cygwin)

MinGW (Minimalist GNU for Windows), formerly mingw32, is a free and open sourcesoftware development environment for creating Microsoft Windows applications.

Installing the 64-bit compiler
Installing the 32-bit compiler

Download the installer for MinGW from here:

MinGW Installer

The instructions on this page refer to version 7.1.0, build revision 1 of theMinGW tools. This is an older version than what we are currently using. As of September, 2019, the version that we are using is 8.1.0, build revision 0.So, if you see any screenshots below that refer to the older version, justsubstitute the newer version and everything should work fine.

Installing the 64-bit Version

Once you've downloaded the installer, follow the steps below to install and configurethe tools.

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Navigate to the folder that contains the MinGW-64 installer mingw-w64-install.exe.This will probably be your Downloads folder.

Run the installer. The initial screen of the installer is shown. Click Next
Make sure you select exactly what is shown below. If you choose a different configuration,there is no guarantee that your compiler will work correctly, causing you to receive a 0 on yourassignments. Click Next to continue.
Change the destination folder to c:mingw as shown below. What ever you do,DO NOT put any spaces in the folder names. Ever. Period. You can select Create shortcuts in Start Menu, but you will likely never use them. Click Next to continue.
At this point, the installer is downloading the necessary files. Once the files have been downloaded, they will be put into the location you specified above.
The installer is now extracting files from the downloaded file and placing them into the installation directory.
When all of the files have been installed, you will see this dialog. Click Next to continue.
If the installation was successful, you will see this final dialog. Click Finish to complete the installation.Done. Almost.
Unfortunately, the hardest part for most students is this last step and 99% of the time that students have a problem, it is because they didn't configure their computers properly after installing the software.
If you want to be able to use the gcc/g++ compilers from any command prompt (which you most definitely do!), you'll need to add the location of the bin folder to the path. Assuming that you have installed MinGW in c:mingw as instructed above, you need to add:
to the beginning of your PATH. If you don't know how to modify the PATH in Windows, you can find out how here , or ask a student that is familiar with Windows.
When adding c:mingwmingw64bin to your PATH, it MUST be the first entry in the PATH.Putting it somewhere else may cause the wrong compilers to be used (probably the compilers from the Cygwin utilities). Once you've modified your PATH,you should logout and log back in to Windows.
When you log back in, open a command prompt. You should now be able to type gcc or g++ from any command windowand get the later version of the compilers.
To verify that you have correctly installed and configured your computer, open a command prompt andtype this:
You should see this displayed:
gcc (x86_64-posix-seh-rev0, Built by MinGW-W64 project) 8.1.0Copyright (C) 2018 Free Software Foundation, Inc.This is free software; see the source for copying conditions. There is NOwarranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Also, if you have already installed and configured the Cygwin utilities, if you typethis at the prompt:You should see this:
/cygdrive/c/mingw/mingw64/bin/gcc
If you see this instead:
Free installation for air conditioner. 'which' is not recognized as an internal or external command,operable program or batch file.
it means that you have not installed the Cygwin utilities, or haven't set the PATHfor Cygwin correctly.Note:
For students that are less experienced working with computers (e.g. installing developer software, configuringthe PATH, working from the command prompt, etc.) you may need to visit the Academic Support Center formore help. The students working there can help you ensure that your computer is configured properly.Or, you can just ask a student that is more familiar with Windows.

Installing the 32-bit Version (Optional)

It's unlikely that anyone is using a 32-bit computer these days, so it is not necessaryto install this version. I'm leaving the instructions here for historical context.

You will use the same installer that you used to install the 64-bit version. However, youwill choose the 32-bit version instead of the 64-bit version.

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Run the installer as before and click Next:
Make sure you select exactly what is shown below. If you choose a different configuration,there is no guarantee that your compiler will work correctly. Basically, you wantto choose the same configuration that you chose for the 64-bit version above.The most important choice is theArchitecture. Choose i686. This is the 32-bit compiler. After setting the selectionsas shown below, click Next to continue.
Change the destination folder to c:mingw32 as shown below. What ever you do,DO NOT put any spaces in the folder names. Ever. Period. You can select Create shortcuts in Start Menu, but you will likely never use them.Click Next to continue.
At this point, the installer is downloading the necessary files. Once the files have been downloaded, they will be extracted and put into the location you specified above.
When all of the files have been installed, you will see this dialog. Click Next to continue.
If the installation was successful, you will see this final dialog. Click Finish to complete the installation.Done. Again, almost.
Unfortunately, just as with the 64-bit installation above, the hardest part is configuring Windows to use the compiler. If you are having problems, it is likely because you haven't set up things properly after the installation.
The rest of this guide assumes that you installed the compiler to c:mingw32during the installation.
Currently, when you type g++ from the command line, you will run the 64-bitversion of the MinGW g++ compiler. You want to continue to do that. To run the 32-bitversion, you will need to create a batch file called g++32.bat and put itin your PATH somewhere. (You should have created a C:utils directoryon your computer to put your add-on programs. This directory should be the first directory in your PATH.) The contents of the batchfile should look like this:
You can create the batch file with any text editor (e.g. notepad++) or, you can downloadthe batch file here: g++32.bat (recommended). You need to download this file, not clickon it and run it (the default in some versions of Windows). There is also a batch filefor gcc here: gcc32.bat. Use this to compile 32-bit C programs.
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