[runtimes] Remove dependencies on cxx_experimental for test-suite installs

This patch removes explicit dependencies on cxx_experimental for
installations that are local to the test suite. Such dependencies
are not required anymore from the test-suite installation targets
since the proper dependency is now encoded between cxx and
cxx_experimental.

Author: ldionne

libcxx/src/CMakeLists.txt

@@ -345,8 +345,8 @@ set_target_properties(cxx_experimental
 cxx_add_common_build_flags(cxx_experimental)
 target_compile_options(cxx_experimental PUBLIC -D_LIBCPP_ENABLE_EXPERIMENTAL)
 
-# Add a meta-target for both libraries.
-add_custom_target(cxx)
+# Add a meta-target for both libraries and the experimental library.
+add_custom_target(cxx DEPENDS cxx_experimental)
 if (LIBCXX_ENABLE_SHARED)
   add_dependencies(cxx cxx_shared)
 endif()
@@ -389,9 +389,6 @@ if (NOT CMAKE_CONFIGURATION_TYPES)
   add_custom_target(install-cxx-stripped
     COMMAND "${CMAKE_COMMAND}" --install "${CMAKE_BINARY_DIR}" --component cxx --strip)
 
-  add_dependencies(install-cxx cxx_experimental)
-  add_dependencies(install-cxx-stripped cxx_experimental)
-
   if (LIBCXX_INSTALL_LIBRARY)
     add_dependencies(install-cxx cxx)
     add_dependencies(install-cxx-stripped cxx)

libcxx/test/CMakeLists.txt

@@ -19,9 +19,6 @@ foreach(target IN LISTS libcxx_test_suite_install_targets)
                                                --component "${target}")
   add_dependencies(cxx-test-depends libcxx-test-suite-install-${target})
 endforeach()
-if (TARGET cxx_experimental)
-  add_dependencies(libcxx-test-suite-install-cxx cxx_experimental)
-endif()
 
 set(AUTO_GEN_COMMENT "## Autogenerated by libcxx configuration.\n# Do not edit!")
 set(SERIALIZED_LIT_PARAMS "# Lit parameters serialized here for llvm-lit to pick them up\n")

libcxxabi/test/CMakeLists.txt

@@ -23,9 +23,6 @@ foreach(target IN LISTS libcxxabi_test_suite_install_targets)
                                                --component "${target}")
   add_dependencies(cxxabi-test-depends libcxxabi-test-suite-install-${target})
 endforeach()
-if (TARGET cxx_experimental)
-  add_dependencies(libcxxabi-test-suite-install-cxx cxx_experimental)
-endif()
 
 pythonize_bool(LIBCXXABI_USE_LLVM_UNWINDER)
 

libunwind/test/CMakeLists.txt

@@ -15,7 +15,7 @@ endmacro()
 set(LIBUNWIND_TESTING_INSTALL_PREFIX "${LIBUNWIND_BINARY_DIR}/test-suite-install")
 set(libunwind_test_suite_install_targets unwind-headers unwind)
 if ("libcxx" IN_LIST LLVM_ENABLE_RUNTIMES)
-  list(APPEND libunwind_test_suite_install_targets cxx-headers cxx cxx_experimental cxx-modules cxxabi-headers cxxabi)
+  list(APPEND libunwind_test_suite_install_targets cxx-headers cxx cxx-modules cxxabi-headers cxxabi)
 endif()
 foreach(target IN LISTS libunwind_test_suite_install_targets)
   add_custom_target(libunwind-test-suite-install-${target} DEPENDS "${target}"