From 78e65bf143edeceae3179c40b511e1313621ffde Mon Sep 17 00:00:00 2001
From: Michael Baentsch <57787676+baentsch@users.noreply.github.com>
Date: Tue, 7 Nov 2023 22:59:03 +0100
Subject: [PATCH] add uninstall support (#1604)

---
 .CMake/cmake_uninstall.cmake.in | 24 ++++++++++++++++++++++++
 CMakeLists.txt                  | 12 ++++++++++++
 README.md                       |  2 ++
 3 files changed, 38 insertions(+)
 create mode 100644 .CMake/cmake_uninstall.cmake.in

diff --git a/.CMake/cmake_uninstall.cmake.in b/.CMake/cmake_uninstall.cmake.in
new file mode 100644
index 000000000..3880d489e
--- /dev/null
+++ b/.CMake/cmake_uninstall.cmake.in
@@ -0,0 +1,24 @@
+# As per https://gitlab.kitware.com/cmake/community/-/wikis/FAQ#can-i-do-make-uninstall-with-cmake
+
+if(NOT EXISTS "@CMAKE_BINARY_DIR@/install_manifest.txt")
+  message(FATAL_ERROR "Cannot find install manifest: @CMAKE_BINARY_DIR@/install_manifest.txt")
+endif()
+
+file(READ "@CMAKE_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()
+  else(IS_SYMLINK "$ENV{DESTDIR}${file}" OR EXISTS "$ENV{DESTDIR}${file}")
+    message(STATUS "File $ENV{DESTDIR}${file} does not exist.")
+  endif()
+endforeach()
+
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7a10f8d57..03912599d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -215,3 +215,15 @@ endif()
 
 set(CPACK_DEBIAN_PACKAGE_MAINTAINER "www.openquantumsafe.org")
 include(CPack)
+
+# uninstall target
+if(NOT TARGET uninstall)
+  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)
+endif()
+
diff --git a/README.md b/README.md
index 037e04f38..2e6950f26 100644
--- a/README.md
+++ b/README.md
@@ -135,6 +135,8 @@ The following instructions assume we are in `build`.
 
 4. `ninja install` can be run to install the built library and `include` files to a location of choice, which can be specified by passing the `-DCMAKE_INSTALL_PREFIX=<dir>` option to `cmake` at configure time. Alternatively, `ninja package` can be run to create an install package.
 
+5. `ninja uninstall` can be run to remove all installation files.
+
 
 ### Windows