cmake : fix usage issues (ggml/1257)

* CMake config: Create target only once

Fix error on repeated find_package(ggml).
For simplicity, check only for the top-level ggml::ggml.

* CMake config: Add CUDA link libs

* CMake config: Add OpenCL link libs

* CMake config: Use canonical find_dependency

Use set and append to control link lib variables.
Apply more $<LINK_ONLY...>.

* CMake config: Wire OpenMP dependency

Author: dg0yt

ggml/cmake/ggml-config.cmake.in

@@ -1,94 +1,130 @@
-
-@GGML_VARIABLES_EXPANDED@
-
 @PACKAGE_INIT@
 
-set_and_check(GGML_INCLUDE_DIR "@PACKAGE_GGML_INCLUDE_INSTALL_DIR@")
-set_and_check(GGML_LIB_DIR "@PACKAGE_GGML_LIB_INSTALL_DIR@")
-#set_and_check(GGML_BIN_DIR "@PACKAGE_GGML_BIN_INSTALL_DIR@")
-
-find_package(Threads REQUIRED)
-
-find_library(GGML_LIBRARY ggml
-    REQUIRED
-    HINTS ${GGML_LIB_DIR}
-    NO_CMAKE_FIND_ROOT_PATH)
-
-add_library(ggml::ggml UNKNOWN IMPORTED)
-set_target_properties(ggml::ggml
-    PROPERTIES
-        IMPORTED_LOCATION "${GGML_LIBRARY}")
-
-find_library(GGML_BASE_LIBRARY ggml-base
-    REQUIRED
-    HINTS ${GGML_LIB_DIR}
-    NO_CMAKE_FIND_ROOT_PATH)
-
-add_library(ggml::ggml-base UNKNOWN IMPORTED)
-set_target_properties(ggml::ggml-base
-    PROPERTIES
-        IMPORTED_LOCATION "${GGML_BASE_LIBRARY}")
+@GGML_VARIABLES_EXPANDED@
 
+# Find all dependencies before creating any target.
+include(CMakeFindDependencyMacro)
+find_dependency(Threads)
 if (NOT GGML_SHARED_LIB)
+    set(GGML_CPU_INTERFACE_LINK_LIBRARIES "")
+    set(GGML_CPU_INTERFACE_LINK_OPTIONS   "")
+
     if (APPLE AND GGML_ACCELERATE)
-        find_library(ACCELERATE_FRAMEWORK Accelerate REQUIRED)
+        find_library(ACCELERATE_FRAMEWORK Accelerate)
+        if(NOT ACCELERATE_FRAMEWORK)
+            set(${CMAKE_FIND_PACKAGE_NAME}_FOUND 0)
+            return()
+        endif()
         list(APPEND GGML_CPU_INTERFACE_LINK_LIBRARIES ${ACCELERATE_FRAMEWORK})
     endif()
 
-    if (GGML_OPENMP)
-        find_package(OpenMP REQUIRED)
+    if (GGML_OPENMP_ENABLED)
+        find_dependency(OpenMP)
         list(APPEND GGML_CPU_INTERFACE_LINK_LIBRARIES OpenMP::OpenMP_C OpenMP::OpenMP_CXX)
     endif()
 
     if (GGML_CPU_HBM)
-        find_library(memkind memkind REQUIRED)
+        find_library(memkind memkind)
+        if(NOT memkind)
+            set(${CMAKE_FIND_PACKAGE_NAME}_FOUND 0)
+            return()
+        endif()
         list(APPEND GGML_CPU_INTERFACE_LINK_LIBRARIES memkind)
     endif()
 
     if (GGML_BLAS)
-        find_package(BLAS REQUIRED)
+        find_dependency(BLAS)
         list(APPEND GGML_CPU_INTERFACE_LINK_LIBRARIES ${BLAS_LIBRARIES})
         list(APPEND GGML_CPU_INTERFACE_LINK_OPTIONS   ${BLAS_LINKER_FLAGS})
     endif()
 
     if (GGML_CUDA)
-        find_package(CUDAToolkit REQUIRED)
+        set(GGML_CUDA_INTERFACE_LINK_LIBRARIES "")
+        find_dependency(CUDAToolkit)
+        if (GGML_STATIC)
+            list(APPEND GGML_CUDA_INTERFACE_LINK_LIBRARIES $<LINK_ONLY:CUDA::cudart_static>)
+            if (WIN32)
+                list(APPEND GGML_CUDA_INTERFACE_LINK_LIBRARIES $<LINK_ONLY:CUDA::cublas> $<LINK_ONLY:CUDA::cublasLt>)
+            else()
+                list(APPEND GGML_CUDA_INTERFACE_LINK_LIBRARIES $<LINK_ONLY:CUDA::cublas_static> $<LINK_ONLY:CUDA::cublasLt_static>)
+            endif()
+        endif()
+        if (NOT GGML_CUDA_NO_VMM)
+            list(APPEND GGML_CUDA_INTERFACE_LINK_LIBRARIES $<LINK_ONLY:CUDA::cuda_driver>)
+        endif()
     endif()
 
     if (GGML_METAL)
-        find_library(FOUNDATION_LIBRARY Foundation REQUIRED)
-        find_library(METAL_FRAMEWORK    Metal REQUIRED)
-        find_library(METALKIT_FRAMEWORK MetalKit REQUIRED)
+        find_library(FOUNDATION_LIBRARY Foundation)
+        find_library(METAL_FRAMEWORK    Metal)
+        find_library(METALKIT_FRAMEWORK MetalKit)
+        if(NOT FOUNDATION_LIBRARY OR NOT METAL_FRAMEWORK OR NOT METALKIT_FRAMEWORK)
+            set(${CMAKE_FIND_PACKAGE_NAME}_FOUND 0)
+            return()
+        endif()
+        set(GGML_METAL_INTERFACE_LINK_LIBRARIES
+            ${FOUNDATION_LIBRARY} ${METAL_FRAMEWORK} ${METALKIT_FRAMEWORK})
+    endif()
 
-        list(APPEND GGML_METAL_INTERFACE_LINK_LIBRARIES
-                    ${FOUNDATION_LIBRARY} ${METAL_FRAMEWORK} ${METALKIT_FRAMEWORK})
+    if (GGML_OPENCL)
+        find_dependency(OpenCL)
+        set(GGML_OPENCL_INTERFACE_LINK_LIBRARIES $<LINK_ONLY:OpenCL::OpenCL>)
     endif()
 
     if (GGML_VULKAN)
-        find_package(Vulkan REQUIRED)
-        list(APPEND GGML_VULKAN_INTERFACE_LINK_LIBRARIES Vulkan::Vulkan)
+        find_dependency(Vulkan)
+        set(GGML_VULKAN_INTERFACE_LINK_LIBRARIES $<LINK_ONLY:Vulkan::Vulkan>)
     endif()
 
     if (GGML_HIP)
-        find_package(hip     REQUIRED)
-        find_package(hipblas REQUIRED)
-        find_package(rocblas REQUIRED)
-        list(APPEND GGML_HIP_INTERFACE_LINK_LIBRARIES hip::host roc::rocblas roc::hipblas)
+        find_dependency(hip)
+        find_dependency(hipblas)
+        find_dependency(rocblas)
+        set(GGML_HIP_INTERFACE_LINK_LIBRARIES hip::host roc::rocblas roc::hipblas)
     endif()
 
     if (GGML_SYCL)
+        set(GGML_SYCL_INTERFACE_LINK_LIBRARIES "")
         find_package(DNNL)
         if (${DNNL_FOUND} AND GGML_SYCL_TARGET STREQUAL "INTEL")
             list(APPEND GGML_SYCL_INTERFACE_LINK_LIBRARIES DNNL::dnnl)
         endif()
         if (WIN32)
-            find_package(IntelSYCL REQUIRED)
-            find_package(MKL       REQUIRED)
+            find_dependency(IntelSYCL)
+            find_dependency(MKL)
             list(APPEND GGML_SYCL_INTERFACE_LINK_LIBRARIES IntelSYCL::SYCL_CXX MKL::MKL MKL::MKL_SYCL)
         endif()
     endif()
 endif()
 
+set_and_check(GGML_INCLUDE_DIR "@PACKAGE_GGML_INCLUDE_INSTALL_DIR@")
+set_and_check(GGML_LIB_DIR "@PACKAGE_GGML_LIB_INSTALL_DIR@")
+#set_and_check(GGML_BIN_DIR "@PACKAGE_GGML_BIN_INSTALL_DIR@")
+
+if(NOT TARGET ggml::ggml)
+
+find_package(Threads REQUIRED)
+
+find_library(GGML_LIBRARY ggml
+    REQUIRED
+    HINTS ${GGML_LIB_DIR}
+    NO_CMAKE_FIND_ROOT_PATH)
+
+add_library(ggml::ggml UNKNOWN IMPORTED)
+set_target_properties(ggml::ggml
+    PROPERTIES
+        IMPORTED_LOCATION "${GGML_LIBRARY}")
+
+find_library(GGML_BASE_LIBRARY ggml-base
+    REQUIRED
+    HINTS ${GGML_LIB_DIR}
+    NO_CMAKE_FIND_ROOT_PATH)
+
+add_library(ggml::ggml-base UNKNOWN IMPORTED)
+set_target_properties(ggml::ggml-base
+    PROPERTIES
+        IMPORTED_LOCATION "${GGML_BASE_LIBRARY}")
+
 set(_ggml_all_targets "")
 foreach(_ggml_backend ${GGML_AVAILABLE_BACKENDS})
     string(REPLACE "-" "_" _ggml_backend_pfx "${_ggml_backend}")
@@ -149,4 +185,6 @@ set_target_properties(ggml::all
     PROPERTIES
         INTERFACE_LINK_LIBRARIES "${_ggml_all_targets}")
 
+endif() # TARGET ggml::ggml
+
 check_required_components(ggml)

ggml/src/ggml-cpu/CMakeLists.txt

@@ -70,10 +70,12 @@ function(ggml_add_cpu_backend_variant_impl tag_name)
     if (GGML_OPENMP)
         find_package(OpenMP)
         if (OpenMP_FOUND)
+            set(GGML_OPENMP_ENABLED "ON" CACHE INTERNAL "")
             target_compile_definitions(${GGML_CPU_NAME} PRIVATE GGML_USE_OPENMP)
 
             target_link_libraries(${GGML_CPU_NAME} PRIVATE OpenMP::OpenMP_C OpenMP::OpenMP_CXX)
         else()
+            set(GGML_OPENMP_ENABLED "OFF" CACHE INTERNAL "")
             message(WARNING "OpenMP not found")
         endif()
     endif()