[libcxx] Remove installation rules on Darwin when it would overwrite the system installation.
Summary:
On Mac OS X overwriting `/usr/lib/libc++.dylib` can cause your computer to fail to boot. This patch tries to make it harder to do that accidentally.
If `CMAKE_SYSTEM_NAME` is `Darwin` and `CMAKE_INSTALL_PREFIX` is `/usr` don't generate installation rules unless the user explicitly provides `LIBCXX_OVERRIDE_DARWIN_INSTALL=ON`. Note that `CMAKE_INSTALL_PREFIX` is always absolute so we don't need to worry about things like `/usr/../usr`.
Reviewers: mclow.lists, beanz, jroelofs
Subscribers: cfe-commits
Differential Revision: http://reviews.llvm.org/D12209
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@246070 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 0c83f05..8be050b 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -133,15 +133,18 @@
SOVERSION "1"
)
-install(TARGETS cxx
- LIBRARY DESTINATION lib${LIBCXX_LIBDIR_SUFFIX} COMPONENT libcxx
- ARCHIVE DESTINATION lib${LIBCXX_LIBDIR_SUFFIX} COMPONENT libcxx
- )
+if (LIBCXX_INSTALL_LIBRARY)
+ install(TARGETS cxx
+ LIBRARY DESTINATION lib${LIBCXX_LIBDIR_SUFFIX} COMPONENT libcxx
+ ARCHIVE DESTINATION lib${LIBCXX_LIBDIR_SUFFIX} COMPONENT libcxx
+ )
+endif()
-if (NOT CMAKE_CONFIGURATION_TYPES)
- add_custom_target(install-libcxx
- DEPENDS cxx
- COMMAND "${CMAKE_COMMAND}"
- -DCMAKE_INSTALL_COMPONENT=libcxx
- -P "${LIBCXX_BINARY_DIR}/cmake_install.cmake")
+if (NOT CMAKE_CONFIGURATION_TYPES AND (LIBCXX_INSTALL_LIBRARY OR
+ LIBCXX_INSTALL_HEADERS))
+ add_custom_target(install-libcxx
+ DEPENDS cxx
+ COMMAND "${CMAKE_COMMAND}"
+ -DCMAKE_INSTALL_COMPONENT=libcxx
+ -P "${LIBCXX_BINARY_DIR}/cmake_install.cmake")
endif()