cmake: add ggml find package (llama/11369)

* Add initial ggml cmake package

* Add build numbers to ggml find-package

* Expand variables with GGML_ prefix

* Guard against adding to cache variable twice

* Add git to msys2 workflow

* Handle ggml-cpu-* variants

* Link ggml/ggml-base libraries to their targets

* Replace main-cmake-pkg with simple-cmake-pkg

* Interface features require c_std_90

* Fix typo

* Removed unnecessary bracket from status message

* Update examples/simple-cmake-pkg/README.md

Co-authored-by: Georgi Gerganov <[email protected]>

* Update examples/simple-cmake-pkg/README.md

Co-authored-by: Georgi Gerganov <[email protected]>

---------

Co-authored-by: Georgi Gerganov <[email protected]>

ggml/CMakeLists.txt

@@ -267,3 +267,74 @@ if (GGML_STANDALONE)
     install(FILES ${CMAKE_CURRENT_BINARY_DIR}/ggml.pc
         DESTINATION share/pkgconfig)
 endif()
+
+#
+# Create CMake package
+#
+
+# Generate version info based on git commit.
+
+find_program(GIT_EXE NAMES git git.exe REQUIRED NO_CMAKE_FIND_ROOT_PATH)
+execute_process(COMMAND ${GIT_EXE} rev-list --count HEAD
+    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+    OUTPUT_VARIABLE GGML_BUILD_NUMBER
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+)
+
+if(GGML_BUILD_NUMBER EQUAL 1)
+    message(WARNING "GGML build version fixed at 1 likely due to a shallow clone.")
+endif()
+
+execute_process(COMMAND ${GIT_EXE} rev-parse --short HEAD
+    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+    OUTPUT_VARIABLE GGML_BUILD_COMMIT
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+)
+
+# Capture variables prefixed with GGML_.
+
+set(variable_set_statements
+"
+####### Expanded from @GGML_VARIABLES_EXPANED@ by configure_package_config_file() #######
+####### Any changes to this file will be overwritten by the next CMake run        #######
+
+")
+
+set(GGML_SHARED_LIB ${BUILD_SHARED_LIBS})
+
+get_cmake_property(all_variables VARIABLES)
+foreach(variable_name IN LISTS all_variables)
+    if(variable_name MATCHES "^GGML_")
+        string(REPLACE ";" "\\;"
+               variable_value "${${variable_name}}")
+
+        set(variable_set_statements
+            "${variable_set_statements}set(${variable_name} \"${variable_value}\")\n")
+    endif()
+endforeach()
+
+set(GGML_VARIABLES_EXPANDED ${variable_set_statements})
+
+# Create the CMake package and set install location.
+
+set(GGML_INSTALL_VERSION 0.0.${GGML_BUILD_NUMBER})
+set(GGML_INCLUDE_INSTALL_DIR ${CMAKE_INSTALL_INCLUDEDIR} CACHE PATH "Location of header  files")
+set(GGML_LIB_INSTALL_DIR     ${CMAKE_INSTALL_LIBDIR}     CACHE PATH "Location of library files")
+set(GGML_BIN_INSTALL_DIR     ${CMAKE_INSTALL_BINDIR}     CACHE PATH "Location of binary  files")
+
+configure_package_config_file(
+        ${CMAKE_CURRENT_SOURCE_DIR}/cmake/ggml-config.cmake.in
+        ${CMAKE_CURRENT_BINARY_DIR}/ggml-config.cmake
+    INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/ggml
+    PATH_VARS GGML_INCLUDE_INSTALL_DIR
+              GGML_LIB_INSTALL_DIR
+              GGML_BIN_INSTALL_DIR)
+
+write_basic_package_version_file(
+        ${CMAKE_CURRENT_BINARY_DIR}/ggml-version.cmake
+    VERSION ${GGML_INSTALL_VERSION}
+    COMPATIBILITY SameMajorVersion)
+
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/ggml-config.cmake
+              ${CMAKE_CURRENT_BINARY_DIR}/ggml-version.cmake
+        DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/ggml)

ggml/src/CMakeLists.txt

@@ -250,6 +250,17 @@ function(ggml_add_backend_library backend)
         target_compile_definitions(${backend} PRIVATE GGML_BACKEND_BUILD)
         target_compile_definitions(${backend} PUBLIC  GGML_BACKEND_SHARED)
     endif()
+
+    if(NOT GGML_AVAILABLE_BACKENDS)
+        set(GGML_AVAILABLE_BACKENDS "${backend}"
+            CACHE INTERNAL "List of backends for cmake package")
+    else()
+        list(FIND GGML_AVAILABLE_BACKENDS "${backend}" has_backend)
+        if(has_backend EQUAL -1)
+            set(GGML_AVAILABLE_BACKENDS "${GGML_AVAILABLE_BACKENDS};${backend}"
+                CACHE INTERNAL "List of backends for cmake package")
+        endif()
+    endif()
 endfunction()
 
 function(ggml_add_backend backend)