[19.x] Backport standalone build fixes for offload

[mgorny]

Backport the changes from #104647 and part of the changes from #118173. Note that I've cherry-picked the individual changes here since merging #118173 wholesale makes automatic merge adds some stuff that weren't present in 19.x. With these changes, I can build and run x86-64 tests of offload in a standalone build, i.e. 19.x becomes in line with main.

[llvmbot]

@llvm/pr-subscribers-offload

Author: Michał Górny (mgorny)

Changes

Backport the changes from #104647 and part of the changes from #118173. Note that I've cherry-picked the individual changes here since merging #118173 wholesale makes automatic merge adds some stuff that weren't present in 19.x. With these changes, I can build and run x86-64 tests of offload in a standalone build, i.e. 19.x becomes in line with main.

---

Full diff: https://github.com/llvm/llvm-project/pull/118643.diff

4 Files Affected:

• (modified) offload/CMakeLists.txt (+21)
• (modified) offload/cmake/OpenMPTesting.cmake (+1-1)
• (modified) offload/plugins-nextgen/common/CMakeLists.txt (+9-7)
• (modified) offload/test/CMakeLists.txt (+8-3)

diff --git a/offload/CMakeLists.txt b/offload/CMakeLists.txt
index 4cd97a6a5ff63d..959d6260bc7490 100644
--- a/offload/CMakeLists.txt
+++ b/offload/CMakeLists.txt
@@ -127,6 +127,7 @@ include(LibomptargetGetDependencies)
 # Set up testing infrastructure.
 include(OpenMPTesting)
 
+include(CheckCXXCompilerFlag)
 check_cxx_compiler_flag(-Werror=global-constructors OFFLOAD_HAVE_WERROR_CTOR)
 
 # LLVM source tree is required at build time for libomptarget
@@ -282,6 +283,26 @@ if(OPENMP_STANDALONE_BUILD)
       ${LLVM_LIBRARY_DIRS}
     REQUIRED
   )
+
+  find_path (
+    LIBOMP_INCLUDE_DIR
+    NAMES
+      omp.h
+    HINTS
+    ${COMPILER_RESOURCE_DIR}/include
+    ${CMAKE_INSTALL_PREFIX}/include
+  )
+
+  get_filename_component(LIBOMP_LIBRARY_DIR ${LIBOMP_STANDALONE} DIRECTORY)
+
+  set(OPENMP_TEST_FLAGS "" CACHE STRING
+    "Extra compiler flags to send to the test compiler.")
+  set(OPENMP_TEST_OPENMP_FLAGS ${OPENMP_TEST_COMPILER_OPENMP_FLAGS} CACHE STRING
+    "OpenMP compiler flag to use for testing OpenMP runtime libraries.")
+  set(LIBOMPTARGET_OPENMP_HEADER_FOLDER "${LIBOMP_INCLUDE_DIR}" CACHE STRING
+    "Path to folder containing omp.h")
+  set(LIBOMPTARGET_OPENMP_HOST_RTL_FOLDER "${LIBOMP_LIBRARY_DIR}" CACHE STRING
+    "Path to folder containing libomp.so, and libLLVMSupport.so with profiling enabled")
 endif()
 
 macro(pythonize_bool var)
diff --git a/offload/cmake/OpenMPTesting.cmake b/offload/cmake/OpenMPTesting.cmake
index 11eafeb764260f..3e04a3423c4d64 100644
--- a/offload/cmake/OpenMPTesting.cmake
+++ b/offload/cmake/OpenMPTesting.cmake
@@ -124,7 +124,7 @@ if (${OPENMP_STANDALONE_BUILD})
   # project is built which is too late for detecting the compiler...
   file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/DetectTestCompiler)
   execute_process(
-    COMMAND ${CMAKE_COMMAND} -G${CMAKE_GENERATOR} ${CMAKE_CURRENT_LIST_DIR}/DetectTestCompiler
+    COMMAND ${CMAKE_COMMAND} -G${CMAKE_GENERATOR} ${CMAKE_CURRENT_SOURCE_DIR}/../openmp/cmake/DetectTestCompiler
       -DCMAKE_C_COMPILER=${OPENMP_TEST_C_COMPILER}
       -DCMAKE_CXX_COMPILER=${OPENMP_TEST_CXX_COMPILER}
     WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/DetectTestCompiler
diff --git a/offload/plugins-nextgen/common/CMakeLists.txt b/offload/plugins-nextgen/common/CMakeLists.txt
index 284f98875170cd..aea20c6ec31435 100644
--- a/offload/plugins-nextgen/common/CMakeLists.txt
+++ b/offload/plugins-nextgen/common/CMakeLists.txt
@@ -11,13 +11,15 @@ add_dependencies(PluginCommon intrinsics_gen)
 
 # Only enable JIT for those targets that LLVM can support.
 set(supported_jit_targets AMDGPU NVPTX)
-foreach(target IN LISTS supported_jit_targets)
-  if("${target}" IN_LIST LLVM_TARGETS_TO_BUILD)
-	  target_compile_definitions(PluginCommon PRIVATE "LIBOMPTARGET_JIT_${target}")
-    llvm_map_components_to_libnames(llvm_libs ${target})
-    target_link_libraries(PluginCommon PRIVATE ${llvm_libs})
-  endif()
-endforeach()
+if (NOT LLVM_LINK_LLVM_DYLIB)
+  foreach(target IN LISTS supported_jit_targets)
+    if("${target}" IN_LIST LLVM_TARGETS_TO_BUILD)
+      target_compile_definitions(PluginCommon PRIVATE "LIBOMPTARGET_JIT_${target}")
+      llvm_map_components_to_libnames(llvm_libs ${target})
+      target_link_libraries(PluginCommon PRIVATE ${llvm_libs})
+    endif()
+  endforeach()
+endif()
 
 # Include the RPC server from the `libc` project if availible.
 if(TARGET llvmlibc_rpc_server AND ${LIBOMPTARGET_GPU_LIBC_SUPPORT})
diff --git a/offload/test/CMakeLists.txt b/offload/test/CMakeLists.txt
index 3ac5d7907e2cc2..c90ed26389faf6 100644
--- a/offload/test/CMakeLists.txt
+++ b/offload/test/CMakeLists.txt
@@ -22,6 +22,11 @@ if(CUDAToolkit_FOUND)
   get_filename_component(CUDA_LIBDIR "${CUDA_cudart_static_LIBRARY}" DIRECTORY)
 endif()
 
+set(OMP_DEPEND)
+if(TARGET omp)
+  set(OMP_DEPEND omp)
+endif()
+
 string(REGEX MATCHALL "([^\ ]+\ |[^\ ]+$)" SYSTEM_TARGETS "${LIBOMPTARGET_SYSTEM_TARGETS}")
 foreach(CURRENT_TARGET IN LISTS SYSTEM_TARGETS)
   string(STRIP "${CURRENT_TARGET}" CURRENT_TARGET)
@@ -29,7 +34,7 @@ foreach(CURRENT_TARGET IN LISTS SYSTEM_TARGETS)
   add_offload_testsuite(check-libomptarget-${CURRENT_TARGET}
     "Running libomptarget tests"
     ${CMAKE_CURRENT_BINARY_DIR}/${CURRENT_TARGET}
-    DEPENDS omptarget omp ${LIBOMPTARGET_TESTED_PLUGINS}
+    DEPENDS omptarget ${OMP_DEPEND} ${LIBOMPTARGET_TESTED_PLUGINS}
     ARGS ${LIBOMPTARGET_LIT_ARG_LIST})
   list(APPEND LIBOMPTARGET_LIT_TESTSUITES ${CMAKE_CURRENT_BINARY_DIR}/${CURRENT_TARGET})
 
@@ -43,12 +48,12 @@ add_offload_testsuite(check-libomptarget
   "Running libomptarget tests"
   ${LIBOMPTARGET_LIT_TESTSUITES}
   EXCLUDE_FROM_CHECK_ALL
-  DEPENDS omptarget omp ${LIBOMPTARGET_TESTED_PLUGINS}
+  DEPENDS omptarget ${OMP_DEPEND} ${LIBOMPTARGET_TESTED_PLUGINS}
   ARGS ${LIBOMPTARGET_LIT_ARG_LIST})
 
 add_offload_testsuite(check-offload
   "Running libomptarget tests"
   ${LIBOMPTARGET_LIT_TESTSUITES}
   EXCLUDE_FROM_CHECK_ALL
-  DEPENDS omptarget omp ${LIBOMPTARGET_TESTED_PLUGINS}
+  DEPENDS omptarget ${OMP_DEPEND} ${LIBOMPTARGET_TESTED_PLUGINS}
   ARGS ${LIBOMPTARGET_LIT_ARG_LIST})

[github-actions]

@mgorny (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix. When you are done, please add the release:note label to this PR.

[mgorny]

Thanks! Since it's a nice setup, and pretty much was broken before, I don't think there's a point in a release note.