[CMake] Fix installation without CLANG_BUILD_EXAMPLES

When CLANG_BUILD_EXAMPLES is not on we set the EXCLUDE_FROM_ALL
directory property for the examples/ directory to tell CMake not to
build them by default.  The AddLLVM.cmake APIs are not aware of this and
try to install targets that are not built.  This does not cause an
install-time error because CMake excludes the directory from the default
installation.  However, now that installation attaches targets to the
LLVMExports export set CMake-based applications that find_package(LLVM)
fail because the example plugin binary is not available.

Tell the AddLLVM.cmake APIs to exclude the examples from installation by
setting the EXCLUDE_FROM_ALL variable they check.

Patch by Brad King!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@201799 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 6213bc7c2a6c5d4efd91ea09825fd3ea9f7031ca..5d4b5fcdb0f6c5bf941de7498e2e3779c6fd8319 100644 (file)
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -1,5 +1,6 @@
 if(NOT CLANG_BUILD_EXAMPLES)
   set_property(DIRECTORY PROPERTY EXCLUDE_FROM_ALL ON)
+  set(EXCLUDE_FROM_ALL ON)
 endif()
 
 if(CLANG_ENABLE_STATIC_ANALYZER)