Add FindWrapHarfbuzz

Apparently we didn't have a wrap find module for it before. Add one,
and add special support to handle a Gentoo broken Config file which is
exported by an autotools build of harbuzz.

Change-Id: I83cbeb817caf2610104c16713d4eac6ab6f8c63b
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Reviewed-by: Qt CMake Build Bot

cmake/FindWrapHarfbuzz.cmake

@@ -0,0 +1,45 @@
+# We can't create the same interface imported target multiple times, CMake will complain if we do
+# that. This can happen if the find_package call is done in multiple different subdirectories.
+if(TARGET WrapHarfbuzz::WrapHarfbuzz)
+    set(WrapHarfbuzz_FOUND ON)
+    return()
+endif()
+
+set(WrapHarfbuzz_FOUND OFF)
+
+find_package(harfbuzz)
+
+# Gentoo has some buggy version of a harfbuzz Config file. Check if include paths are valid.
+set(__harfbuzz_target_name "harfbuzz::harfbuzz")
+if(harfbuzz_FOUND AND TARGET "${__harfbuzz_target_name}")
+    get_property(__harfbuzz_include_paths TARGET "${__harfbuzz_target_name}"
+                                          PROPERTY INTERFACE_INCLUDE_DIRECTORIES)
+    foreach(__harfbuzz_include_dir ${__harfbuzz_include_paths})
+        if(NOT EXISTS "${__harfbuzz_include_dir}")
+            # Must be the broken Gentoo harfbuzzConfig.cmake file. Try to use pkg-config instead.
+            set(__harfbuzz_broken_config_file TRUE)
+            break()
+        endif()
+    endforeach()
+endif()
+
+if(__harfbuzz_broken_config_file)
+    find_package(PkgConfig)
+
+    pkg_check_modules(harfbuzz harfbuzz IMPORTED_TARGET)
+    set(__harfbuzz_target_name "PkgConfig::harfbuzz")
+
+    if (NOT TARGET "${__harfbuzz_target_name}")
+        set(harfbuzz_FOUND 0)
+    endif()
+endif()
+
+if(TARGET "${__harfbuzz_target_name}")
+    set(WrapHarfbuzz_FOUND ON)
+
+    add_library(WrapHarfbuzz::WrapHarfbuzz INTERFACE IMPORTED)
+    target_link_libraries(WrapHarfbuzz::WrapHarfbuzz INTERFACE ${__harfbuzz_target_name})
+endif()
+unset(__harfbuzz_target_name)
+unset(__harfbuzz_include_dir)
+unset(__harfbuzz_broken_config_file)

src/gui/configure.cmake

@@ -30,7 +30,7 @@ qt_find_package(WrapFreetype PROVIDED_TARGETS WrapFreetype::WrapFreetype)
 set_package_properties(WrapFreetype PROPERTIES TYPE REQUIRED)
 qt_find_package(Fontconfig PROVIDED_TARGETS Fontconfig::Fontconfig)
 qt_find_package(gbm PROVIDED_TARGETS gbm::gbm)
-qt_find_package(harfbuzz PROVIDED_TARGETS harfbuzz::harfbuzz)
+qt_find_package(WrapHarfbuzz PROVIDED_TARGETS WrapHarfbuzz::WrapHarfbuzz)
 qt_find_package(Libinput PROVIDED_TARGETS Libinput::Libinput)
 qt_find_package(JPEG PROVIDED_TARGETS JPEG::JPEG)
 qt_find_package(PNG PROVIDED_TARGETS PNG::PNG)

util/cmake/helper.py

@@ -384,7 +384,7 @@ _library_map = [
     LibraryMapping("gnu_iconv", None, None),
     LibraryMapping("gtk3", "GTK3", "PkgConfig::GTK3"),
     LibraryMapping("gssapi", "GSSAPI", "GSSAPI::GSSAPI"),
-    LibraryMapping("harfbuzz", "harfbuzz", "harfbuzz::harfbuzz"),
+    LibraryMapping("harfbuzz", "WrapHarfbuzz", "WrapHarfbuzz::WrapHarfbuzz"),
     LibraryMapping("host_dbus", None, None),
     LibraryMapping(
         "icu", "ICU", "ICU::i18n ICU::uc ICU::data", extra=["COMPONENTS", "i18n", "uc", "data"]