[CMake] Provide a custom target to install LLVM libraries

[phosek]

Summary

This simplifies installing all LLVM libraries when doing component
build; now you can include llvm-libraries in distribution components.

[beanz]

One small comment below. Otherwise LGTM.

llvm/CMakeLists.txt

986 ↗

(On Diff #163748)

Should probably wrap this in if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY) because that variable gates generating the install-${lib} targets, so it will explode with missing targets if LLVM_INSTALL_TOOLCHAIN_ONLY=On.

[phosek]

llvm/CMakeLists.txt

986 ↗

(On Diff #163748)

It's already in the if(NOT LLVM_INSTALL_TOOLCHAIN_ONLY) block that starts at line 949.

[beanz]

LGTM! Didn't look back through enough context.

llvm/trunk/CMakeLists.txt

if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
   add_custom_target(llvm-headers DEPENDS intrinsics_gen)
   set_target_properties(llvm-headers PROPERTIES FOLDER "Misc")
 
   if (NOT CMAKE_CONFIGURATION_TYPES)
     add_llvm_install_targets(install-llvm-headers
                              DEPENDS llvm-headers
                              COMPONENT llvm-headers)
   endif()
+
+  # Custom target to install all libraries.
+  add_custom_target(llvm-libraries)
+  set_target_properties(llvm-libraries PROPERTIES FOLDER "Misc")
+
+  if (NOT CMAKE_CONFIGURATION_TYPES)
+    add_llvm_install_targets(install-llvm-libraries
+                             DEPENDS llvm-libraries
+                             COMPONENT llvm-libraries)
+  endif()
+
+  get_property(LLVM_LIBS GLOBAL PROPERTY LLVM_LIBS)
+  if(LLVM_LIBS)
+    list(REMOVE_DUPLICATES LLVM_LIBS)
+    foreach(lib ${LLVM_LIBS})
+      add_dependencies(llvm-libraries ${lib})
+      if (NOT CMAKE_CONFIGURATION_TYPES)
+        add_dependencies(install-llvm-libraries install-${lib})
+      endif()
+    endforeach()
+  endif()
 endif()
 
 # This must be at the end of the LLVM root CMakeLists file because it must run
 # after all targets are created.
 if(LLVM_DISTRIBUTION_COMPONENTS)
   if(CMAKE_CONFIGURATION_TYPES)
     message(FATAL_ERROR "LLVM_DISTRIBUTION_COMPONENTS cannot be specified with multi-configuration generators (i.e. Xcode or Visual Studio)")
   endif()