1 files changed, 61 insertions, 0 deletions
diff --git a/cmake/modules/Findfmt.cmake b/cmake/modules/Findfmt.cmake
new file mode 100644
index 000000000..734c2b057
--- /dev/null
+++ b/cmake/modules/Findfmt.cmake
@@ -0,0 +1,61 @@
+find_path(fmt_INCLUDE_DIR NAMES fmt/format.h)
+
+if(fmt_INCLUDE_DIR)
+  set(_fmt_version_file "${fmt_INCLUDE_DIR}/fmt/core.h")
+  if(NOT EXISTS "${_fmt_version_file}")
+    set(_fmt_version_file "${fmt_INCLUDE_DIR}/fmt/format.h")
+  endif()
+  if(EXISTS "${_fmt_version_file}")
+    # parse "#define FMT_VERSION 40100" to 4.1.0
+    file(STRINGS "${_fmt_version_file}" fmt_VERSION_LINE
+      REGEX "^#define[ \t]+FMT_VERSION[ \t]+[0-9]+$")
+    string(REGEX REPLACE "^#define[ \t]+FMT_VERSION[ \t]+([0-9]+)$"
+      "\\1" fmt_VERSION "${fmt_VERSION_LINE}")
+    foreach(ver "fmt_VERSION_PATCH" "fmt_VERSION_MINOR" "fmt_VERSION_MAJOR")
+      math(EXPR ${ver} "${fmt_VERSION} % 100")
+      math(EXPR fmt_VERSION "(${fmt_VERSION} - ${${ver}}) / 100")
+    endforeach()
+    set(fmt_VERSION
+      "${fmt_VERSION_MAJOR}.${fmt_VERSION_MINOR}.${fmt_VERSION_PATCH}")
+  endif()
+endif()
+
+find_library(fmt_LIBRARY NAMES fmt)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(fmt
+  REQUIRED_VARS fmt_INCLUDE_DIR fmt_LIBRARY
+  VERSION_VAR fmt_VERSION)
+mark_as_advanced(
+  fmt_INCLUDE_DIR
+  fmt_LIBRARY
+  fmt_VERSION_MAJOR
+  fmt_VERSION_MINOR
+  fmt_VERSION_PATCH
+  fmt_VERSION_STRING)
+
+if(fmt_FOUND AND NOT (TARGET fmt::fmt))
+  add_library(fmt-header-only INTERFACE)
+  set_target_properties(fmt-header-only PROPERTIES
+    INTERFACE_INCLUDE_DIRECTORIES "${fmt_INCLUDE_DIR}"
+    INTERFACE_COMPILE_DEFINITIONS FMT_HEADER_ONLY=1
+    INTERFACE_COMPILE_FEATURES cxx_std_11)
+
+  add_library(fmt UNKNOWN IMPORTED GLOBAL)
+  set_target_properties(fmt PROPERTIES
+    INTERFACE_INCLUDE_DIRECTORIES "${fmt_INCLUDE_DIR}"
+    INTERFACE_COMPILE_FEATURES cxx_std_11
+    IMPORTED_LINK_INTERFACE_LANGUAGES "CXX"
+    IMPORTED_LOCATION "${fmt_LIBRARY}")
+
+  if(WITH_FMT_HEADER_ONLY)
+    # please note, this is different from how upstream defines fmt::fmt.
+    # in order to force 3rd party libraries to link against fmt-header-only if
+    # WITH_FMT_HEADER_ONLY is ON, we have to point fmt::fmt to fmt-header-only
+    # in this case.
+    add_library(fmt::fmt ALIAS fmt-header-only)
+  else()
+    add_library(fmt::fmt ALIAS fmt)
+  endif()
+
+endif()