From a1b79aeab982755b7943f52631877087393b24ac Mon Sep 17 00:00:00 2001
From: Chris Bieneman <beanz@apple.com>
Date: Thu, 3 Dec 2015 18:52:54 +0000
Subject: [PATCH] [CMake] If you're not installing the libcxx library, exclude
 it from the "all" target so it doesn't get built when you run "ninja install"

This is just a build dependency optimization. Running check-libcxx will still build libcxx and function as expected, it just removes libcxx from the all build and install targets.

llvm-svn: 254628
---
 libcxx/lib/CMakeLists.txt | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/libcxx/lib/CMakeLists.txt b/libcxx/lib/CMakeLists.txt
index 00e875e63b73..1c8af3e6aa55 100644
--- a/libcxx/lib/CMakeLists.txt
+++ b/libcxx/lib/CMakeLists.txt
@@ -24,10 +24,14 @@ if (MSVC_IDE OR XCODE)
   endif()
 endif()
 
+if(NOT LIBCXX_INSTALL_LIBRARY)
+  set(exclude_from_all EXCLUDE_FROM_ALL)
+endif()
+
 if (LIBCXX_ENABLE_SHARED)
-  add_library(cxx SHARED ${LIBCXX_SOURCES} ${LIBCXX_HEADERS})
+  add_library(cxx SHARED ${exclude_from_all} ${LIBCXX_SOURCES} ${LIBCXX_HEADERS})
 else()
-  add_library(cxx STATIC ${LIBCXX_SOURCES} ${LIBCXX_HEADERS})
+  add_library(cxx STATIC ${exclude_from_all} ${LIBCXX_SOURCES} ${LIBCXX_HEADERS})
 endif()
 
 if (DEFINED LIBCXX_CXX_ABI_DEPS)
@@ -172,8 +176,11 @@ endif()
 
 if (NOT CMAKE_CONFIGURATION_TYPES AND (LIBCXX_INSTALL_LIBRARY OR
                                        LIBCXX_INSTALL_HEADERS))
+    if(LIBCXX_INSTALL_LIBRARY)
+      set(deps DEPENDS cxx)
+    endif()
     add_custom_target(install-libcxx
-                      DEPENDS cxx
+                      ${deps}
                       COMMAND "${CMAKE_COMMAND}"
                       -DCMAKE_INSTALL_COMPONENT=libcxx
                       -P "${LIBCXX_BINARY_DIR}/cmake_install.cmake")