Running C++ application in Windows that relies on DLL created by Cygwin

Uses Cygwin to create a DLL that gets loaded by a C++ application. As a result, the C++ application depends on

• The DLL that gets built by Cygwin
• The Cygwin DLL

Prerequisites

• Cygwin is installed
• GNU g++ is installed
• Building and testing can be performed in Cygwin command prompt

Building the DLL

$ ./build.sh

Testing the DLL

• Copy cygwin1.dll to the folder of the functional test executable (the functional test executable gets created in the next step)
• Test the DLL by invoking ./test.sh
• If you want to confirm that the executable requires the cygwin1.dll,
  • Delete the cygwin1.dll
  • Open a Windows command prompt
  • cd to folder of this project
  • Invoke functionalTest.exe and note that it fails because can't find cygwin1.dll
  • Restore cygwin1.dll to this folder
  • Run functionalTest.exe again and note that the DLL created by build.sh prints a simple hello world message