[CMake] Option to control whether shared/static library is installed

Currently it's only possible to control whether shared or static library
build of libc++, libc++abi and libunwind is enabled or disabled and
whether to install everything we've built or not. However, it'd be
useful to have more fine grained control, e.g. when static libraries are
merged together into libc++.a we don't need to install libc++abi.a and
libunwind.a. This change adds this option.

Differential Revision: https://reviews.llvm.org/D49573

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@337867 91177308-0d34-0410-b5e6-96231b3b80d8

CMakeLists.txt

@@ -93,6 +93,12 @@ set(LIBCXX_LIBDIR_SUFFIX "${LLVM_LIBDIR_SUFFIX}" CACHE STRING
     "Define suffix of library directory name (32/64)")
 option(LIBCXX_INSTALL_HEADERS "Install the libc++ headers." ON)
 option(LIBCXX_INSTALL_LIBRARY "Install the libc++ library." ON)
+cmake_dependent_option(LIBCXX_INSTALL_STATIC_LIBRARY
+  "Install the static libc++ library." ON
+  "LIBCXX_ENABLE_STATIC;LIBCXX_INSTALL_LIBRARY" OFF)
+cmake_dependent_option(LIBCXX_INSTALL_SHARED_LIBRARY
+  "Install the shared libc++ library." ON
+  "LIBCXX_ENABLE_SHARED;LIBCXX_INSTALL_LIBRARY" OFF)
 option(LIBCXX_INSTALL_SUPPORT_HEADERS "Install libc++ support headers." ON)
 cmake_dependent_option(LIBCXX_INSTALL_EXPERIMENTAL_LIBRARY
         "Install libc++experimental.a" ON

lib/CMakeLists.txt

@@ -220,8 +220,6 @@ set_target_properties(cxx_objects
     COMPILE_FLAGS "${LIBCXX_COMPILE_FLAGS}"
 )
 
-set(LIBCXX_TARGETS)
-
 # Build the shared library.
 if (LIBCXX_ENABLE_SHARED)
   add_library(cxx_shared SHARED $<TARGET_OBJECTS:cxx_objects>)
@@ -236,7 +234,10 @@ if (LIBCXX_ENABLE_SHARED)
       VERSION       "${LIBCXX_ABI_VERSION}.0"
       SOVERSION     "${LIBCXX_ABI_VERSION}"
   )
-  list(APPEND LIBCXX_TARGETS "cxx_shared")
+  list(APPEND LIBCXX_BUILD_TARGETS "cxx_shared")
+  if (LIBCXX_INSTALL_SHARED_LIBRARY)
+    list(APPEND LIBCXX_INSTALL_TARGETS "cxx_shared")
+  endif()
   if(WIN32 AND NOT MINGW AND NOT "${CMAKE_HOST_SYSTEM_NAME}" STREQUAL "Windows")
     # Since we most likely do not have a mt.exe replacement, disable the
     # manifest bundling.  This allows a normal cmake invocation to pass which
@@ -256,8 +257,10 @@ if (LIBCXX_ENABLE_STATIC)
       LINK_FLAGS    "${LIBCXX_LINK_FLAGS}"
       OUTPUT_NAME   "c++"
   )
-
-  list(APPEND LIBCXX_TARGETS "cxx_static")
+  list(APPEND LIBCXX_BUILD_TARGETS "cxx_static")
+  if (LIBCXX_INSTALL_STATIC_LIBRARY)
+    list(APPEND LIBCXX_INSTALL_TARGETS "cxx_static")
+  endif()
   # Attempt to merge the libc++.a archive and the ABI library archive into one.
   if (LIBCXX_STATICALLY_LINK_ABI_IN_STATIC_LIBRARY)
     set(MERGE_ARCHIVES_SEARCH_PATHS "")
@@ -286,7 +289,7 @@ if (LIBCXX_ENABLE_STATIC)
 endif()
 
 # Add a meta-target for both libraries.
-add_custom_target(cxx DEPENDS cxx-headers ${LIBCXX_TARGETS})
+add_custom_target(cxx DEPENDS cxx-headers ${LIBCXX_BUILD_TARGETS})
 
 if (LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY)
   file(GLOB LIBCXX_EXPERIMENTAL_SOURCES ../src/experimental/*.cpp)
@@ -362,7 +365,7 @@ if (LIBCXX_INSTALL_LIBRARY)
   if (LIBCXX_INSTALL_EXPERIMENTAL_LIBRARY)
     set(experimental_lib cxx_experimental)
   endif()
-  install(TARGETS ${LIBCXX_TARGETS} ${experimental_lib}
+  install(TARGETS ${LIBCXX_INSTALL_TARGETS} ${experimental_lib}
     LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}lib${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
     ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}lib${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
     )