add cmake module to find libFmt

cmake/Modules/FindFmt.cmake

@@ -0,0 +1,100 @@
+# FindFmt
+# -------
+# Finds the Fmt library
+#
+# This will define the following variables::
+#
+# FMT_FOUND - system has Fmt
+# FMT_INCLUDE_DIRS - the Fmt include directory
+# FMT_LIBRARIES - the Fmt libraries
+#
+# and the following imported targets::
+#
+#   Fmt::Fmt   - The Fmt library
+
+if(ENABLE_INTERNAL_FMT)
+  include(ExternalProject)
+  file(STRINGS ${CMAKE_SOURCE_DIR}/tools/depends/target/libfmt/Makefile VER REGEX "^[ ]*VERSION[ ]*=.+$")
+  string(REGEX REPLACE "^[ ]*VERSION[ ]*=[ ]*" "" FMT_VERSION "${VER}")
+
+  # allow user to override the download URL with a local tarball
+  # needed for offline build envs
+  if(FMT_URL)
+      get_filename_component(FMT_URL "${FMT_URL}" ABSOLUTE)
+  else()
+      set(FMT_URL http://mirrors.kodi.tv/build-deps/sources/fmt-${FMT_VERSION}.tar.gz)
+  endif()
+  if(VERBOSE)
+      message(STATUS "FMT_URL: ${FMT_URL}")
+  endif()
+
+  if(APPLE)
+    set(EXTRA_ARGS "-DCMAKE_OSX_ARCHITECTURES=${CMAKE_OSX_ARCHITECTURES}")
+  endif()
+
+  set(FMT_LIBRARY ${CMAKE_BINARY_DIR}/${CORE_BUILD_DIR}/lib/libfmt.a)
+  set(FMT_INCLUDE_DIR ${CMAKE_BINARY_DIR}/${CORE_BUILD_DIR}/include)
+  externalproject_add(fmt
+                      URL ${FMT_URL}
+                      DOWNLOAD_DIR ${CMAKE_BINARY_DIR}/${CORE_BUILD_DIR}/download
+                      PREFIX ${CORE_BUILD_DIR}/fmt
+                      CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${CMAKE_BINARY_DIR}/${CORE_BUILD_DIR}
+                                 -DCMAKE_CXX_EXTENSIONS=${CMAKE_CXX_EXTENSIONS}
+                                 -DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD}
+                                 -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE}
+                                 -DCMAKE_INSTALL_LIBDIR=lib
+                                 -DFMT_DOC=OFF
+                                 -DFMT_TEST=OFF
+                                 "${EXTRA_ARGS}"
+                      BUILD_BYPRODUCTS ${FMT_LIBRARY})
+  set_target_properties(fmt PROPERTIES FOLDER "External Projects")
+
+  include(FindPackageHandleStandardArgs)
+  find_package_handle_standard_args(Fmt
+                                    REQUIRED_VARS FMT_LIBRARY FMT_INCLUDE_DIR
+                                    VERSION_VAR FMT_VERSION)
+
+  set(FMT_LIBRARIES ${FMT_LIBRARY})
+  set(FMT_INCLUDE_DIRS ${FMT_INCLUDE_DIR})
+
+else()
+
+find_package(FMT 6.1.2 CONFIG REQUIRED QUIET)
+
+if(PKG_CONFIG_FOUND)
+  pkg_check_modules(PC_FMT libfmt QUIET)
+  if(PC_FMT_VERSION AND NOT FMT_VERSION)
+    set(FMT_VERSION ${PC_FMT_VERSION})
+  endif()
+endif()
+
+find_path(FMT_INCLUDE_DIR NAMES fmt/format.h
+                          PATHS ${PC_FMT_INCLUDEDIR})
+
+find_library(FMT_LIBRARY_RELEASE NAMES fmt
+                                PATHS ${PC_FMT_LIBDIR})
+find_library(FMT_LIBRARY_DEBUG NAMES fmtd
+                               PATHS ${PC_FMT_LIBDIR})
+
+include(SelectLibraryConfigurations)
+select_library_configurations(FMT)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Fmt
+                                  REQUIRED_VARS FMT_LIBRARY FMT_INCLUDE_DIR FMT_VERSION
+                                  VERSION_VAR FMT_VERSION)
+
+if(FMT_FOUND)
+  set(FMT_LIBRARIES ${FMT_LIBRARY})
+  set(FMT_INCLUDE_DIRS ${FMT_INCLUDE_DIR})
+
+  if(NOT TARGET fmt)
+    add_library(fmt UNKNOWN IMPORTED)
+    set_target_properties(fmt PROPERTIES
+                               IMPORTED_LOCATION "${FMT_LIBRARY}"
+                               INTERFACE_INCLUDE_DIRECTORIES "${FMT_INCLUDE_DIR}")
+  endif()
+endif()
+
+endif()
+mark_as_advanced(FMT_INCLUDE_DIR FMT_LIBRARY)