[Libomptarget] Output the DeviceRTL alongside the other libraries (#73705)

Summary:
Currently, the `libomp.so` and `libomptarget.so` are emitted in the
`./lib` build directory generally. This logic is internal to the
`add_llvm_library` function we use to build `libomptarget`. The
DeviceRTl static library however is in the middle of the OpenMP runtime
build, which can vary depending on if this is a runtimes or projects
build. This patch changes this to install the DeviceRTL static library
alongside the other OpenMP libraries so they are easier to find.

Author: jhuber6

openmp/libomptarget/CMakeLists.txt

@@ -24,6 +24,12 @@ set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${LIBOMPTARGET_LIBRARY_DIR})
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${LIBOMPTARGET_LIBRARY_DIR})
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${LIBOMPTARGET_LIBRARY_DIR})
 
+if(LLVM_LIBRARY_OUTPUT_INTDIR)
+  set(LIBOMPTARGET_INTDIR ${LIBOMPTARGET_LIBRARY_DIR})
+else()
+  set(LIBOMPTARGET_INTDIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
+endif()
+
 # Message utilities.
 include(LibomptargetUtils)
 
@@ -115,6 +121,8 @@ set(LIBOMPTARGET_OPENMP_HOST_RTL_FOLDER "${LIBOMP_LIBRARY_DIR}" CACHE STRING
   "Path to folder containing libomp.so, and libLLVMSupport.so with profiling enabled")
 set(LIBOMPTARGET_LLVM_LIBRARY_DIR "${LLVM_LIBRARY_DIR}" CACHE STRING
   "Path to folder containing llvm library libomptarget.so")
+set(LIBOMPTARGET_LLVM_LIBRARY_INTDIR "${LIBOMPTARGET_INTDIR}" CACHE STRING
+  "Path to folder where intermediate libraries will be output")
 
 # Build offloading plugins and device RTLs if they are available.
 add_subdirectory(plugins-nextgen)

openmp/libomptarget/DeviceRTL/CMakeLists.txt

@@ -301,7 +301,10 @@ endforeach()
 
 # Archive all the object files generated above into a static library
 add_library(omptarget.devicertl STATIC)
-set_target_properties(omptarget.devicertl PROPERTIES LINKER_LANGUAGE CXX)
+set_target_properties(omptarget.devicertl PROPERTIES
+  ARCHIVE_OUTPUT_DIRECTORY ${LIBOMPTARGET_LLVM_LIBRARY_INTDIR}
+  LINKER_LANGUAGE CXX
+)
 target_link_libraries(omptarget.devicertl PRIVATE omptarget.devicertl.all_objs)
 
 install(TARGETS omptarget.devicertl ARCHIVE DESTINATION ${OPENMP_INSTALL_LIBDIR})

openmp/libomptarget/test/lit.cfg

@@ -156,8 +156,8 @@ def remove_suffix_if_present(name):
 def add_libraries(source):
     if config.libomptarget_has_libc:
         return source + " " + config.llvm_library_dir + "/libcgpu.a " + \
-               config.library_dir + "/libomptarget.devicertl.a"
-    return source + " " + config.library_dir + "/libomptarget.devicertl.a"
+               config.llvm_library_intdir + "/libomptarget.devicertl.a"
+    return source + " " + config.llvm_library_intdir + "/libomptarget.devicertl.a"
 
 # substitutions
 # - for targets that exist in the system create the actual command.

openmp/libomptarget/test/lit.site.cfg.in

@@ -13,6 +13,7 @@ config.cuda_test_arch = "@LIBOMPTARGET_DEP_CUDA_ARCH@"
 config.libomptarget_obj_root = "@CMAKE_CURRENT_BINARY_DIR@/@CURRENT_TARGET@"
 config.library_dir = "@LIBOMPTARGET_LIBRARY_DIR@"
 config.llvm_library_dir = "@LIBOMPTARGET_LLVM_LIBRARY_DIR@"
+config.llvm_library_intdir = "@LIBOMPTARGET_LLVM_LIBRARY_INTDIR@"
 config.omp_header_directory = "@LIBOMPTARGET_OPENMP_HEADER_FOLDER@"
 config.omp_host_rtl_directory = "@LIBOMPTARGET_OPENMP_HOST_RTL_FOLDER@"
 config.llvm_lib_directory = "@LIBOMPTARGET_LLVM_LIBRARY_DIR@"