[CMake][runtimes] Move libunwind, libc++abi and libc++ to lib/ and include/

[phosek]

Summary

This change is a consequence of the discussion in "RFC: Place libs in
Clang-dedicated directories", specifically the suggestion that
libunwind, libc++abi and libc++ shouldn't be using Clang resource
directory. Tools like clangd make this assumption, but this is
currently not true for the LLVM_ENABLE_PER_TARGET_RUNTIME_DIR build.
This change addresses that by moving the output of these libraries to
lib/<target> and include/ directories, leaving resource directory only
for compiler-rt runtimes and Clang builtin headers.

[smeenai]

clang/lib/Driver/ToolChain.cpp

94

Is this supposed to append lib twice?

libcxx/CMakeLists.txt

421

Having the libdir suffix after the target triple looks weird ... also, the driver code doesn't appear to be taking the possibility of a suffix into account? I might be missing something here.

[phosek]

libcxx/CMakeLists.txt

421

This is a bit of a hack, we allow building runtimes with sanitizer instrumentation and we install those sanitized versions into lib/<target>/<sanitizer>, e.g. lib/x86_64-fuchsia/asan. Those are never linked against (the ABI should be the same as for the non-sanitized version), they're only intended for packaging, hence the missing driver logic. We use the <RUNTIME>_LIBDIR_SUFFIX to set the <sanitizer> portion of the install path, see https://github.com/llvm/llvm-project/blob/master/llvm/runtimes/CMakeLists.txt#L517. However, if anyone ever tries to use both the LIBDIR_SUFFIX and instrumentation, things are going to break. Maybe we should introduce another variable for this, e.g. <RUNTIME>_LIBDIR_VARIANT?

[smeenai]

clang/test/Driver/linux-per-target-runtime-dir.c

13

Shouldn't this one be different now?

libcxx/CMakeLists.txt

421

It's expected for LIBCXX_LIBDIR_SUBDIR to always begin with a /, correct? I feel like it would be less error-prone to have places using that variable add the / rather than relying on the variable containing it. In particular, since the variable name contains SUBDIR, I wouldn't expect to have to specify the leading / of the subdirectory myself.

Case in point: if I'm reading correctly, DEFAULT_INSTALL_PREFIX will end with a trailing /, and then LIBCXX_INSTALL_LIBDIR will begin with a leading /, so you'll end up with two consecutive / when you join the two in lib/CMakeLists.txt. Not a big deal, but also easily avoidable, I think.

[smeenai]

LGTM, thanks!

libcxx/CMakeLists.txt

420–421

These two variables are unused now, right? (and their equivalents in libcxxabi and libunwind)

424–425

string(APPEND) could be used here – I don't know why that's so uncommon (I only see one instance of it in the entirety of llvm-project right now).

[phosek]

libcxx/CMakeLists.txt

420–421

Yes, this is something I actually introduced in previous iterations of the runtimes build efforts. We could consider deleting them altogether, but I don't know how to find out if there are any users of these. I could send an email to libcxx-dev and see if anyone responds.

clang/lib/Driver/ToolChain.cpp

 }
 
 ToolChain::ToolChain(const Driver &D, const llvm::Triple &T,
                      const ArgList &Args)
     : D(D), Triple(T), Args(Args), CachedRTTIArg(GetRTTIArgument(Args)),
       CachedRTTIMode(CalculateRTTIMode(Args, Triple, CachedRTTIArg)) {
   SmallString<128> P;
 
+  P.assign(D.Dir);
+  llvm::sys::path::append(P, "..", "lib", D.getTargetTriple());
+  if (getVFS().exists(P))
+    getLibraryPaths().push_back(P.str());
+
   P.assign(D.ResourceDir);
   llvm::sys::path::append(P, D.getTargetTriple(), "lib");
   if (getVFS().exists(P))
     getLibraryPaths().push_back(P.str());
 
   P.assign(D.ResourceDir);
   llvm::sys::path::append(P, Triple.str(), "lib");
   if (getVFS().exists(P))
     getLibraryPaths().push_back(P.str());
 
   std::string CandidateLibPath = getArchSpecificLibPath();
   if (getVFS().exists(CandidateLibPath))
     getFilePaths().push_back(CandidateLibPath);
 }
 
 void ToolChain::setTripleEnvironment(llvm::Triple::EnvironmentType Env) {
   Triple.setEnvironment(Env);
   if (EffectiveTriple != llvm::Triple())
     EffectiveTriple.setEnvironment(Env);
 }

clang/lib/Driver/ToolChains/Fuchsia.cpp

 void Fuchsia::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
                                            ArgStringList &CC1Args) const {
   if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
       DriverArgs.hasArg(options::OPT_nostdincxx))
     return;
 
   switch (GetCXXStdlibType(DriverArgs)) {
   case ToolChain::CST_Libcxx: {
-    SmallString<128> P(getDriver().ResourceDir);
-    llvm::sys::path::append(P, "include", "c++", "v1");
+    SmallString<128> P(getDriver().Dir);
+    llvm::sys::path::append(P, "..", "include", "c++", "v1");
     addSystemInclude(DriverArgs, CC1Args, P.str());
     break;
   }
 
   default:
     llvm_unreachable("invalid stdlib name");
   }
 }

clang/lib/Driver/ToolChains/Linux.cpp

static std::string DetectLibcxxIncludePath(StringRef base) {
   }
   return MaxVersion ? (base + "/" + MaxVersionString).str() : "";
 }
 
 void Linux::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
                                   llvm::opt::ArgStringList &CC1Args) const {
   const std::string& SysRoot = computeSysRoot();
   const std::string LibCXXIncludePathCandidates[] = {
-      DetectLibcxxIncludePath(getDriver().ResourceDir + "/include/c++"),
       DetectLibcxxIncludePath(getDriver().Dir + "/../include/c++"),
       // If this is a development, non-installed, clang, libcxx will
       // not be found at ../include/c++ but it likely to be found at
       // one of the following two locations:
       DetectLibcxxIncludePath(SysRoot + "/usr/local/include/c++"),
       DetectLibcxxIncludePath(SysRoot + "/usr/include/c++") };
   for (const auto &IncludePath : LibCXXIncludePathCandidates) {
     if (IncludePath.empty() || !getVFS().exists(IncludePath))

clang/test/Driver/linux-per-target-runtime-dir.c

 // RUN: %clang -no-canonical-prefixes -x c++ %s -### -o %t.o 2>&1 \
 // RUN:     --target=x86_64-linux-gnu \
 // RUN:     -stdlib=libc++ \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:     -ccc-install-dir %S/Inputs/basic_linux_libcxx_tree/usr/bin \
 // RUN:     --gcc-toolchain="" \
 // RUN:     --sysroot=%S/Inputs/basic_linux_libcxx_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-PER-TARGET-RUNTIME %s
+// CHECK-PER-TARGET-RUNTIME: InstalledDir: [[INSTDIR:.*]]
 // CHECK-PER-TARGET-RUNTIME: "{{[^"]*}}clang{{[^"]*}}" "-cc1"
 // CHECK-PER-TARGET-RUNTIME: "-resource-dir" "[[RESDIR:[^"]*]]"
 // CHECK-PER-TARGET-RUNTIME: "-isysroot" "[[SYSROOT:[^"]+]]"
-// CHECK-PER-TARGET-RUNTIME: "-internal-isystem" "[[RESDIR]]/include/c++/v1"
+// CHECK-PER-TARGET-RUNTIME: "-internal-isystem" "[[INSTDIR]]/../include/c++/v1"
 // CHECK-PER-TARGET-RUNTIME: "-internal-isystem" "[[SYSROOT]]/usr/local/include"
 // CHECK-PER-TARGET-RUNTIME: "--sysroot=[[SYSROOT]]"
+// CHECK-PER-TARGET-RUNTIME: "-L[[INSTDIR]]{{/|\\\\}}..{{/|\\\\}}lib{{/|\\\\}}x86_64-linux-gnu"
 // CHECK-PER-TARGET-RUNTIME: "-L[[RESDIR]]{{/|\\\\}}x86_64-linux-gnu{{/|\\\\}}lib"
 
 // RUN: %clang -rtlib=compiler-rt -print-libgcc-file-name 2>&1 \
 // RUN:     --target=x86_64-linux-gnu \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:   | FileCheck --check-prefix=CHECK-CLANGRT-X8664 %s
 // CHECK-CLANGRT-X8664: x86_64-linux-gnu{{/|\\}}lib{{/|\\}}libclang_rt.builtins.a
 
 // RUN: %clang -rtlib=compiler-rt -print-file-name=libclang_rt.builtins.a 2>&1 \
 // RUN:     --target=x86_64-linux-gnu \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:   | FileCheck --check-prefix=CHECK-FILE-NAME-X8664 %s
 // CHECK-FILE-NAME-X8664: x86_64-linux-gnu{{/|\\}}lib{{/|\\}}libclang_rt.builtins.a

libcxx/CMakeLists.txt

 set(LIBCXX_SOURCE_DIR  ${CMAKE_CURRENT_SOURCE_DIR})
 set(LIBCXX_BINARY_DIR  ${CMAKE_CURRENT_BINARY_DIR})
 set(LIBCXX_BINARY_INCLUDE_DIR "${LIBCXX_BINARY_DIR}/include/c++build")
 
 string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" CLANG_VERSION
        ${PACKAGE_VERSION})
 
 if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
-  set(DEFAULT_INSTALL_PREFIX lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/${LLVM_DEFAULT_TARGET_TRIPLE}/)
-  set(DEFAULT_INSTALL_HEADER_PREFIX lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/)
-  set(LIBCXX_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/clang/${CLANG_VERSION}/${LLVM_DEFAULT_TARGET_TRIPLE}/lib${LIBCXX_LIBDIR_SUFFIX})
-  set(LIBCXX_HEADER_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/clang/${CLANG_VERSION})
+  set(LIBCXX_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LLVM_DEFAULT_TARGET_TRIPLE})
+  set(LIBCXX_HEADER_DIR ${LLVM_BINARY_DIR})
+  set(LIBCXX_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE})
+  if(LIBCXX_LIBDIR_SUBDIR)
+    string(APPEND LIBCXX_LIBRARY_DIR /${LIBCXX_LIBDIR_SUBDIR})
+    string(APPEND LIBCXX_INSTALL_LIBRARY_DIR /${LIBCXX_LIBDIR_SUBDIR})
+  endif()
 elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
   set(LIBCXX_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
   set(LIBCXX_HEADER_DIR  ${LLVM_BINARY_DIR})
+  set(LIBCXX_INSTALL_LIBRARY_DIR lib${LIBCXX_LIBDIR_SUFFIX})
 else()
   set(LIBCXX_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBCXX_LIBDIR_SUFFIX})
+  set(LIBCXX_INSTALL_LIBRARY_DIR lib${LIBCXX_LIBDIR_SUFFIX})
 endif()
 
 file(MAKE_DIRECTORY "${LIBCXX_BINARY_INCLUDE_DIR}")
 
-set(LIBCXX_INSTALL_PREFIX ${DEFAULT_INSTALL_PREFIX} CACHE STRING
-    "Define libc++ destination prefix.")
-
-set(LIBCXX_INSTALL_HEADER_PREFIX ${DEFAULT_INSTALL_HEADER_PREFIX} CACHE STRING
-    "Define libc++ header destination prefix.")
+set(LIBCXX_INSTALL_PREFIX "" CACHE STRING "Define libc++ destination prefix.")
+set(LIBCXX_INSTALL_HEADER_PREFIX "" CACHE STRING "Define libc++ header destination prefix.")
 
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${LIBCXX_LIBRARY_DIR})
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${LIBCXX_LIBRARY_DIR})
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${LIBCXX_LIBRARY_DIR})
 
 # Declare libc++ configuration variables.
 # They are intended for use as follows:
 # LIBCXX_CXX_FLAGS: General flags for both the compiler and linker.

libcxx/lib/CMakeLists.txt

 if (LIBCXX_INSTALL_LIBRARY)
   if (LIBCXX_INSTALL_FILESYSTEM_LIBRARY)
     set(filesystem_lib cxx_filesystem)
   endif()
   if (LIBCXX_INSTALL_EXPERIMENTAL_LIBRARY)
     set(experimental_lib cxx_experimental)
   endif()
   install(TARGETS ${LIBCXX_INSTALL_TARGETS} ${filesystem_lib} ${experimental_lib}
-    LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}lib${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
-    ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}lib${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
+    LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
+    ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
     )
   # NOTE: This install command must go after the cxx install command otherwise
   # it will not be executed after the library symlinks are installed.
   if (LIBCXX_ENABLE_SHARED AND LIBCXX_ENABLE_ABI_LINKER_SCRIPT)
     # Replace the libc++ filename with $<TARGET_LINKER_FILE:cxx>
     # after we required CMake 3.0.
     install(FILES "${LIBCXX_LIBRARY_DIR}/libc++${CMAKE_SHARED_LIBRARY_SUFFIX}"
-      DESTINATION ${LIBCXX_INSTALL_PREFIX}lib${LIBCXX_LIBDIR_SUFFIX}
+      DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR}
       COMPONENT libcxx)
   endif()
 endif()
 
 if (NOT CMAKE_CONFIGURATION_TYPES AND (LIBCXX_INSTALL_LIBRARY OR
                                        LIBCXX_INSTALL_HEADERS))
     if(LIBCXX_INSTALL_LIBRARY)
       set(lib_install_target cxx)

libcxxabi/CMakeLists.txt

 set(LIBCXXABI_COMPILER    ${CMAKE_CXX_COMPILER})
 set(LIBCXXABI_SOURCE_DIR  ${CMAKE_CURRENT_SOURCE_DIR})
 set(LIBCXXABI_BINARY_DIR  ${CMAKE_CURRENT_BINARY_DIR})
 
 string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" CLANG_VERSION
        ${PACKAGE_VERSION})
 
 if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
-  set(DEFAULT_INSTALL_PREFIX lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/${LLVM_DEFAULT_TARGET_TRIPLE}/)
-  set(LIBCXXABI_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/clang/${CLANG_VERSION}/${LLVM_DEFAULT_TARGET_TRIPLE}/lib${LIBCXXABI_LIBDIR_SUFFIX})
+  set(LIBCXXABI_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LLVM_DEFAULT_TARGET_TRIPLE})
+  set(LIBCXXABI_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE})
+  if(LIBCXX_LIBDIR_SUBDIR)
+    string(APPEND LIBCXXABI_LIBRARY_DIR /${LIBCXXABI_LIBDIR_SUBDIR})
+    string(APPEND LIBCXXABI_INSTALL_LIBRARY_DIR /${LIBCXXABI_LIBDIR_SUBDIR})
+  endif()
 elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
   set(LIBCXXABI_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
+  set(LIBCXXABI_INSTALL_LIBRARY_DIR lib${LIBCXXABI_LIBDIR_SUFFIX})
 else()
   set(LIBCXXABI_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBCXXABI_LIBDIR_SUFFIX})
+  set(LIBCXXABI_INSTALL_LIBRARY_DIR lib${LIBCXXABI_LIBDIR_SUFFIX})
 endif()
 
-set(LIBCXXABI_INSTALL_PREFIX ${DEFAULT_INSTALL_PREFIX} CACHE STRING
-    "Define libc++abi destination prefix.")
+set(LIBCXXABI_INSTALL_PREFIX "" CACHE STRING "Define libc++abi destination prefix.")
 
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${LIBCXXABI_LIBRARY_DIR})
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${LIBCXXABI_LIBRARY_DIR})
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${LIBCXXABI_LIBRARY_DIR})
 
 # By default, for non-standalone builds, libcxx and libcxxabi share a library
 # directory.
 if (NOT LIBCXXABI_LIBCXX_LIBRARY_PATH)

libcxxabi/src/CMakeLists.txt

if (LIBCXXABI_ENABLE_STATIC)
   endif()
 endif()
 
 # Add a meta-target for both libraries.
 add_custom_target(cxxabi DEPENDS ${LIBCXXABI_BUILD_TARGETS})
 
 if (LIBCXXABI_INSTALL_LIBRARY)
   install(TARGETS ${LIBCXXABI_INSTALL_TARGETS}
-    LIBRARY DESTINATION ${LIBCXXABI_INSTALL_PREFIX}lib${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
-    ARCHIVE DESTINATION ${LIBCXXABI_INSTALL_PREFIX}lib${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
+    LIBRARY DESTINATION ${LIBCXXABI_INSTALL_PREFIX}${LIBCXXABI_INSTALL_LIBRARY_DIR} COMPONENT cxxabi
+    ARCHIVE DESTINATION ${LIBCXXABI_INSTALL_PREFIX}${LIBCXXABI_INSTALL_LIBRARY_DIR} COMPONENT cxxabi
     )
 endif()
 
 if (NOT CMAKE_CONFIGURATION_TYPES AND LIBCXXABI_INSTALL_LIBRARY)
   add_custom_target(install-cxxabi
     DEPENDS cxxabi
     COMMAND "${CMAKE_COMMAND}"
             -DCMAKE_INSTALL_COMPONENT=cxxabi

libunwind/CMakeLists.txt

 set(LIBUNWIND_COMPILER    ${CMAKE_CXX_COMPILER})
 set(LIBUNWIND_SOURCE_DIR  ${CMAKE_CURRENT_SOURCE_DIR})
 set(LIBUNWIND_BINARY_DIR  ${CMAKE_CURRENT_BINARY_DIR})
 
 string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" CLANG_VERSION
        ${PACKAGE_VERSION})
 
 if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
-  set(DEFAULT_INSTALL_PREFIX lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/${LLVM_DEFAULT_TARGET_TRIPLE}/)
-  set(LIBUNWIND_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/clang/${CLANG_VERSION}/${LLVM_DEFAULT_TARGET_TRIPLE}/lib${LIBUNWIND_LIBDIR_SUFFIX})
+  set(LIBUNWIND_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LLVM_DEFAULT_TARGET_TRIPLE}${LIBUNWIND_LIBDIR_SUBDIR})
+  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE})
+  if(LIBCXX_LIBDIR_SUBDIR)
+    string(APPEND LIBUNWIND_LIBRARY_DIR /${LIBUNWIND_LIBDIR_SUBDIR})
+    string(APPEND LIBUNWIND_INSTALL_LIBRARY_DIR /${LIBUNWIND_LIBDIR_SUBDIR})
+  endif()
 elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
   set(LIBUNWIND_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
+  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LIBUNWIND_LIBDIR_SUFFIX})
 else()
   set(LIBUNWIND_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBUNWIND_LIBDIR_SUFFIX})
+  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LIBUNWIND_LIBDIR_SUFFIX})
 endif()
 
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${LIBUNWIND_LIBRARY_DIR})
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${LIBUNWIND_LIBRARY_DIR})
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${LIBUNWIND_LIBRARY_DIR})
 
-set(LIBUNWIND_INSTALL_PREFIX ${DEFAULT_INSTALL_PREFIX} CACHE STRING
-    "Define libunwind destination prefix.")
+set(LIBUNWIND_INSTALL_PREFIX "" CACHE STRING "Define libunwind destination prefix.")
 
 set(LIBUNWIND_C_FLAGS "")
 set(LIBUNWIND_CXX_FLAGS "")
 set(LIBUNWIND_COMPILE_FLAGS "")
 set(LIBUNWIND_LINK_FLAGS "")
 
 # Get required flags.
 macro(unwind_append_if list condition var)

libunwind/src/CMakeLists.txt

if (LIBUNWIND_ENABLE_STATIC)
   endif()
 endif()
 
 # Add a meta-target for both libraries.
 add_custom_target(unwind DEPENDS ${LIBUNWIND_BUILD_TARGETS})
 
 if (LIBUNWIND_INSTALL_LIBRARY)
   install(TARGETS ${LIBUNWIND_INSTALL_TARGETS}
-    LIBRARY DESTINATION ${LIBUNWIND_INSTALL_PREFIX}lib${LIBUNWIND_LIBDIR_SUFFIX} COMPONENT unwind
-    ARCHIVE DESTINATION ${LIBUNWIND_INSTALL_PREFIX}lib${LIBUNWIND_LIBDIR_SUFFIX} COMPONENT unwind)
+    LIBRARY DESTINATION ${LIBUNWIND_INSTALL_PREFIX}${LIBUNWIND_INSTALL_LIBRARY_DIR} COMPONENT unwind
+    ARCHIVE DESTINATION ${LIBUNWIND_INSTALL_PREFIX}${LIBUNWIND_INSTALL_LIBRARY_DIR} COMPONENT unwind)
 endif()
 
 if (NOT CMAKE_CONFIGURATION_TYPES AND LIBUNWIND_INSTALL_LIBRARY)
   add_custom_target(install-unwind
     DEPENDS unwind
     COMMAND "${CMAKE_COMMAND}"
             -DCMAKE_INSTALL_COMPONENT=unwind
             -P "${LIBUNWIND_BINARY_DIR}/cmake_install.cmake")
   add_custom_target(install-unwind-stripped
     DEPENDS unwind
     COMMAND "${CMAKE_COMMAND}"
             -DCMAKE_INSTALL_COMPONENT=unwind
             -DCMAKE_INSTALL_DO_STRIP=1
             -P "${LIBUNWIND_BINARY_DIR}/cmake_install.cmake")
 endif()

llvm/runtimes/CMakeLists.txt

if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})
 
   foreach(entry ${runtimes})
     get_filename_component(projName ${entry} NAME)
 
     # TODO: Clean this up as part of an interface standardization
     string(REPLACE "-" "_" canon_name ${projName})
     string(TOUPPER ${canon_name} canon_name)
 
-    if(LLVM_RUNTIMES_LIBDIR_SUFFIX)
-      set(${canon_name}_LIBDIR_SUFFIX "${LLVM_RUNTIMES_LIBDIR_SUFFIX}" CACHE STRING "" FORCE)
+    if(LLVM_RUNTIMES_LIBDIR_SUBDIR)
+      set(${canon_name}_LIBDIR_SUBDIR "${LLVM_RUNTIMES_LIBDIR_SUBDIR}" CACHE STRING "" FORCE)
     endif()
 
     # Setting a variable to let sub-projects detect which other projects
     # will be included under here.
     set(HAVE_${canon_name} ON)
   endforeach()
 
   # We do this in two loops so that HAVE_* is set for each runtime before the
function(runtime_default_target)
     endif()
 
     llvm_ExternalProject_Add(runtimes
                              ${CMAKE_CURRENT_SOURCE_DIR}
                              DEPENDS ${ARG_DEPENDS}
                              # Builtins were built separately above
                              CMAKE_ARGS -DCOMPILER_RT_BUILD_BUILTINS=Off
                                         -DLLVM_INCLUDE_TESTS=${LLVM_INCLUDE_TESTS}
+                                        -DLLVM_BINARY_DIR=${LLVM_BINARY_DIR}
                                         -DLLVM_LIBRARY_DIR=${LLVM_LIBRARY_DIR}
                                         -DLLVM_DEFAULT_TARGET_TRIPLE=${TARGET_TRIPLE}
                                         -DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=ON
                                         -DCMAKE_C_COMPILER_TARGET=${TARGET_TRIPLE}
                                         -DCMAKE_CXX_COMPILER_TARGET=${TARGET_TRIPLE}
                                         -DCMAKE_ASM_COMPILER_TARGET=${TARGET_TRIPLE}
                                         -DCMAKE_C_COMPILER_WORKS=ON
                                         -DCMAKE_CXX_COMPILER_WORKS=ON
function(runtime_register_target name target)
     endforeach()
 
     llvm_ExternalProject_Add(runtimes-${name}
                              ${CMAKE_CURRENT_SOURCE_DIR}
                              DEPENDS ${${name}_deps}
                              # Builtins were built separately above
                              CMAKE_ARGS -DCOMPILER_RT_BUILD_BUILTINS=Off
                                         -DLLVM_INCLUDE_TESTS=${LLVM_INCLUDE_TESTS}
+                                        -DLLVM_BINARY_DIR=${LLVM_BINARY_DIR}
                                         -DLLVM_LIBRARY_DIR=${LLVM_LIBRARY_DIR}
                                         -DLLVM_DEFAULT_TARGET_TRIPLE=${target}
                                         -DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=ON
                                         -DCMAKE_C_COMPILER_TARGET=${target}
                                         -DCMAKE_CXX_COMPILER_TARGET=${target}
                                         -DCMAKE_ASM_COMPILER_TARGET=${target}
                                         -DCMAKE_C_COMPILER_WORKS=ON
                                         -DCMAKE_CXX_COMPILER_WORKS=ON
else()
           set(sanitizer_name "ubsan")
         else()
           message(FATAL_ERROR "Unsupported value of LLVM_RUNTIME_TARGET_SANITIZERS: ${sanitizers}")
         endif()
         foreach(name ${LLVM_RUNTIME_SANITIZER_${sanitizer}_TARGETS})
           runtime_register_target(${name}-${sanitizer_name} ${name}
             DEPENDS runtimes-${name}
             CMAKE_ARGS -DLLVM_USE_SANITIZER=${sanitizer}
-                       -DLLVM_RUNTIMES_PREFIX=${name}/
-                       -DLLVM_RUNTIMES_LIBDIR_SUFFIX=/${sanitizer_name})
+                       -DLLVM_RUNTIMES_LIBDIR_SUBDIR=${sanitizer_name})
           add_dependencies(runtimes runtimes-${name}-${sanitizer_name})
           add_dependencies(runtimes-configure runtimes-${name}-${sanitizer_name}-configure)
           add_dependencies(install-runtimes install-runtimes-${name}-${sanitizer_name})
           add_dependencies(install-runtimes-stripped install-runtimes-${name}-${sanitizer_name}-stripped)
         endforeach()
       endforeach()
     endif()