Added draft doc on CMake integration.

README.md

@@ -20,7 +20,7 @@ Implib.so provides an easy solution - link your program with a _wrapper_ which
 
 Generated wrapper code (often also called "shim" code or "shim" library) is analogous to Windows import libraries which achieve the same functionality for DLLs.
 
-Implib.so can also be used to [reduce API provided by existing shared library](doc/ReduceLibraryInterface.md) or [rename it's exported symbols](doc/RenameLibraryInterface.md).
+Implib.so can also be used to [reduce API provided by existing shared library](doc/ReduceLibraryInterface.md) or [rename it's exported symbols](doc/RenameLibraryInterface.md). See [this page](doc/CMakeIntegration.md) for info on integrating Implib.so into a CMake project.
 
 Implib.so was originally inspired by Stackoverflow question [Is there an elegant way to avoid dlsym when using dlopen in C?](https://stackoverflow.com/questions/45917816/is-there-an-elegant-way-to-avoid-dlsym-when-using-dlopen-in-c/47221180).
 

doc/CMakeIntegration.md

@@ -0,0 +1,28 @@
+If your CMake project links to some library which you would like to replace with Implib.so wrapper:
+```
+cmake_minimum_required(VERSION 3.21)
+
+project(prog)
+
+add_executable(prog prog.c)
+
+target_link_libraries(prog PRIVATE xcb)
+```
+you just need to add a custom command to generate wrapper code and link against `libdl`:
+```
+cmake_minimum_required(VERSION 3.21)
+
+project(prog)
+
+enable_language(ASM)
+
+add_custom_command(
+  OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/libxcb.so.tramp.S ${CMAKE_CURRENT_BINARY_DIR}/libxcb.so.init.c
+  COMMAND implib-gen.py /usr/lib/x86_64-linux-gnu/libxcb.so
+  DEPENDS /usr/lib/x86_64-linux-gnu/libxcb.so
+)
+
+add_executable(prog prog.c ${CMAKE_CURRENT_BINARY_DIR}/libxcb.so.tramp.S ${CMAKE_CURRENT_BINARY_DIR}/libxcb.so.init.c)
+
+target_link_libraries(prog PRIVATE dl)
+```