From db8ee253106d1b6e932d6a7410fa220c49e8b7e3 Mon Sep 17 00:00:00 2001
From: Erwin Janssen <erwinjanssen@outlook.com>
Date: Sat, 31 Dec 2016 13:05:14 +0100
Subject: [PATCH] Add 'uninstall' target to CMake build

When CMake performs the 'install' step, it keeps track of the installed
files by listing them in the `install_manifest.txt` file. The 'uninstall'
step reverses the installation by removing the files listed in the
manifest. This solution is taken directly from the CMake FAQ:
https://cmake.org/Wiki/CMake_FAQ#Can_I_do_.22make_uninstall.22_with_CMake.3://cmake.org/Wiki/CMake_FAQ#Can_I_do_.22make_uninstall.22_with_CMake.3F
---
 CMakeLists.txt                 | 10 ++++++++++
 cmake/cmake_uninstall.cmake.in | 21 +++++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 cmake/cmake_uninstall.cmake.in

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 709f687ef..482dcfb0d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -49,3 +49,13 @@ set(CPACK_GENERATOR ZIP)
 include(CPack)
 
 add_subdirectory(lib)
+
+# Uninstall target
+# ================
+configure_file(
+    "${CMAKE_CURRENT_SOURCE_DIR}/cmake/cmake_uninstall.cmake.in"
+    "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake"
+    IMMEDIATE @ONLY)
+
+add_custom_target(uninstall
+    COMMAND ${CMAKE_COMMAND} -P ${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake)
diff --git a/cmake/cmake_uninstall.cmake.in b/cmake/cmake_uninstall.cmake.in
new file mode 100644
index 000000000..48f2cd1f2
--- /dev/null
+++ b/cmake/cmake_uninstall.cmake.in
@@ -0,0 +1,21 @@
+if(NOT EXISTS "@CMAKE_CURRENT_BINARY_DIR@/install_manifest.txt")
+    message(FATAL_ERROR "Cannot find install manifest: @CMAKE_CURRENT_BINARY_DIR@/install_manifest.txt")
+endif(NOT EXISTS "@CMAKE_CURRENT_BINARY_DIR@/install_manifest.txt")
+
+file(READ "@CMAKE_CURRENT_BINARY_DIR@/install_manifest.txt" files)
+string(REGEX REPLACE "\n" ";" files "${files}")
+foreach(file ${files})
+    message(STATUS "Uninstalling $ENV{DESTDIR}${file}")
+    if(IS_SYMLINK "$ENV{DESTDIR}${file}" OR EXISTS "$ENV{DESTDIR}${file}")
+        exec_program(
+            "@CMAKE_COMMAND@" ARGS "-E remove \"$ENV{DESTDIR}${file}\""
+            OUTPUT_VARIABLE rm_out
+            RETURN_VALUE rm_retval
+        )
+        if(NOT "${rm_retval}" STREQUAL 0)
+            message(FATAL_ERROR "Problem when removing $ENV{DESTDIR}${file}")
+        endif(NOT "${rm_retval}" STREQUAL 0)
+    else(IS_SYMLINK "$ENV{DESTDIR}${file}" OR EXISTS "$ENV{DESTDIR}${file}")
+        message(STATUS "File $ENV{DESTDIR}${file} does not exist.")
+    endif(IS_SYMLINK "$ENV{DESTDIR}${file}" OR EXISTS "$ENV{DESTDIR}${file}")
+endforeach(file)
-- 
2.40.0