How do I add an icon to a mingw-gcc compiled executable?

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You need to create the icon first. Then you need to create a RC file with the below content. Here we’ll name it as my.rc.

id ICON "path/to/my.ico"

The id mentioned in the above command can be pretty much anything. It doesn’t matter unless you want to refer to it in your code. Then run windres as follows:

windres my.rc -O coff -o my.res

Then while building the executable, along with other object files and resource files, include my.res which we got from the above step. e.g.:

g++ -o my_app obj1.o obj2.o res1.res my.res

And that should be all there is to it.

And, at no extra charge, if you want to include version information in your
application, add the following boilerplate to a new .rc file and follow the above mentioned steps.

1 VERSIONINFO
FILEVERSION     1,0,0,0
PRODUCTVERSION  1,0,0,0
BEGIN
  BLOCK "StringFileInfo"
  BEGIN
    BLOCK "080904E4"
    BEGIN
      VALUE "CompanyName", "My Company Name"
      VALUE "FileDescription", "My excellent application"
      VALUE "FileVersion", "1.0"
      VALUE "InternalName", "my_app"
      VALUE "LegalCopyright", "My Name"
      VALUE "OriginalFilename", "my_app.exe"
      VALUE "ProductName", "My App"
      VALUE "ProductVersion", "1.0"
    END
  END
  BLOCK "VarFileInfo"
  BEGIN
    VALUE "Translation", 0x809, 1252
  END
END

Note, the langID is for U.K. English (which is the closest localisation to
Australia I could identify.) If you want U.S. “English” then change the BLOCK
line to:

BLOCK "040904E4"

and the translation line to:

VALUE "Translation", 0x409, 1252

See VERSIONINFO resource for for info.

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