How to add icon to cmake app in windows

cmake_windows_icon.txt

1. Put app.ico in directory.

2. Create app.rc in same directory with one line:
IDI_ICON1               ICON        DISCARDABLE            "app.ico"

3. Run command (Warning: it's app.o, not app.res, how it is mentioned in other manuals!)
windres app.rc -o app.o

4. add_executable(app
  ...
  app.o
)

5. Proofit!

This post is incorrect. The Doc identify option /fo resname for anyone using cmake here is a snippet that generates the .RES script form RC compilation. Also make sure the resource.h file include windows.h header file .

adds a custom build step to a file. Generates the resources

add_custom_command(
TARGET LibTransactX
PRE_BUILD
DEPENDS RC
COMMAND RC /v /r ${CMAKE_SOURCE_DIR}/res/app.rc
WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}/res"
COMMENT "Build step to produce the icon file"
)