add uninstall target (#242)

CMakeLists.txt

@@ -176,6 +176,17 @@ include( CMakePushCheckState )
 include( GNUInstallDirs )
 include( TestBigEndian )
 
+# uninstall target, adding this before anything stupid (wxwidgets) does
+if(NOT TARGET uninstall)
+  configure_file(
+    "${SNEEDACITY_MODULE_PATH}/uninstall.cmake.in"
+    "${CMAKE_BINARY_DIR}/uninstall.cmake"
+    IMMEDIATE @ONLY)
+
+  add_custom_target(uninstall
+    COMMAND ${CMAKE_COMMAND} -P ${CMAKE_BINARY_DIR}/uninstall.cmake)
+endif()
+
 # Determine 32-bit or 64-bit target
 if( CMAKE_C_COMPILER_ID MATCHES "MSVC" AND CMAKE_VS_PLATFORM_NAME MATCHES "Win64|x64" )
    set( IS_64BIT ON )

cmake-proxies/cmake-modules/uninstall.cmake.in

@@ -0,0 +1,21 @@
+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()