From 4663c80d3ab19fc7d9408fe8fb22b07b87c76e5a Mon Sep 17 00:00:00 2001
From: Jason Juang <jasjuang@gmail.com>
Date: Tue, 11 Jul 2017 14:22:41 -0700
Subject: [PATCH] cmake: Add convenience uninstall target (#221)

Note: Leaves behind empty directories, no real uninstaller. Just for convenience of some.
---
 CMakeLists.txt                 |  8 ++++++++
 cmake/cmake_uninstall.cmake.in | 26 ++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 cmake/cmake_uninstall.cmake.in

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3709073..0b46798 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -700,3 +700,11 @@ if (BUILD_PACKAGING)
   include (CPack)
 
 endif () # BUILD_PACKAGING
+
+if (NOT GFLAGS_IS_SUBPROJECT AND NOT TARGET uninstall)
+  configure_file (
+    "${CMAKE_CURRENT_SOURCE_DIR}/cmake/cmake_uninstall.cmake.in"
+    "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake" @ONLY
+  )
+  add_custom_target(uninstall COMMAND ${CMAKE_COMMAND} -P "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake")
+endif ()
diff --git a/cmake/cmake_uninstall.cmake.in b/cmake/cmake_uninstall.cmake.in
new file mode 100644
index 0000000..d00a516
--- /dev/null
+++ b/cmake/cmake_uninstall.cmake.in
@@ -0,0 +1,26 @@
+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")
+
+if (NOT DEFINED CMAKE_INSTALL_PREFIX)
+  set (CMAKE_INSTALL_PREFIX "@CMAKE_INSTALL_PREFIX@")
+endif ()
+ message(${CMAKE_INSTALL_PREFIX})
+
+file(READ "@CMAKE_CURRENT_BINARY_DIR@/install_manifest.txt" files)
+string(REGEX REPLACE "\n" ";" files "${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)