[Interest] Building 6.9.1 fails with missing harrfbuzz includes inside qtwebengine/third_party/freetype

[Marcel Gotsch]

Hi,

we're trying to build Qt 6.9.1 from sources, but face an issue on macOS.
Somehow the harfbuzz includes aren't found when building qtwebengine.

I've already started to debug the CMake code involved and what I was able
to find out so far is that qtwebengine uses the HarfbuzzPrivate interface
library to determine the INTERFACE_INCLUDE_DIRECTORIES which are then
injected into some generated GN scripts. The includes match the list
mentioned in the compiler error below, but they don't the necessary
qtbase/3rdparty/harfbuzz-ng/include/harfbuzz path. The HarfbuzzPrivate
library is defined purely by qt_internal_add_3rdparty_header_module, which
doesn't add the necessary include directories. We're a bit lost at the
moment how this is supposed to work.

Any help is much appreciated!

Here's the exact compiler error:

FAILED: obj/third_party/freetype/freetype_source/autofit.o
../../../../../../../../../../../Applications/
Xcode-v15.4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
-MMD -MF obj/third_party/freetype/freetype_source/autofit.o.d
-DHAVE_UNISTD_H -DHAVE_FCNTL_H -DFT2_BUILD_LIBRARY -DOFFICIAL_BUILD
-DTOOLKIT_QT -DCR_XCODE_VERSION=1620
-D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_NONE -DNDEBUG -DNVALGRIND
-DDYNAMIC_ANNOTATIONS_ENABLED=0
-DFT_CONFIG_MODULES_H=\"freetype-custom/freetype/config/ftmodule.h\"
-DFT_CONFIG_OPTIONS_H=\"freetype-custom/freetype/config/ftoption.h\"
-DPDFIUM_REQUIRED_MODULES -DCHROMIUM_RESTRICT_VISIBILITY
-I../../../../../../libs/qt5/qtwebengine/src/3rdparty/chromium/third_party/freetype/src/include/freetype/config
-Igen -I../../../../../../libs/qt5/qtwebengine/src/3rdparty/chromium
-I/Volumes/build/jenkins-build/8acaa1/sources/build-Qt-6.9.1-R1-macx-clang-static/qtbase/include
-I/Volumes/build/jenkins-build/8acaa1/sources/build-Qt-6.9.1-R1-macx-clang-static/qtbase/include/QtHarfbuzz
-I/Volumes/build/jenkins-build/8acaa1/sources/libs/qt5/qtbase/src/3rdparty/harfbuzz-ng
-I/Volumes/build/jenkins-build/8acaa1/sources/build-Qt-6.9.1-R1-macx-clang-static/qtbase/src/3rdparty/harfbuzz-ng
-I../../../../../../libs/qt5/qtwebengine/src/3rdparty/chromium/third_party/freetype/include
-I../../../../../../libs/qt5/qtwebengine/src/3rdparty/chromium/third_party/freetype/include/freetype-custom
-I../../../../../../libs/qt5/qtwebengine/src/3rdparty/chromium/third_party/freetype/src/include
-I../../../../../../libs/qt5/qtwebengine/src/3rdparty/chromium/third_party/zlib
-fno-delete-null-pointer-checks -fno-ident -fno-strict-aliasing
-fstack-protector -Wno-unknown-argument -Wno-unknown-attributes
-Wno-unknown-warning-option -Wno-ignored-attributes
-Wno-predefined-identifier-outside-function -Wno-self-assign
-Wno-unknown-pragmas -fcolor-diagnostics -fmerge-all-constants
-fno-sized-deallocation --target=x86_64-apple-macos -O2 -fno-math-errno
-fno-omit-frame-pointer -g0 -isysroot
../../../../../../../../../../../Applications/
Xcode-v16.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.2.sdk
-mmacos-version-min=13.0 -fvisibility=hidden -Wheader-hygiene
-Wstring-conversion -Wtautological-overlap-compare -Wall
-Wno-unused-variable -Wno-c++11-narrowing -Wno-unused-but-set-variable
-Wno-misleading-indentation -Wunguarded-availability
-Wno-missing-field-initializers -Wno-unused-parameter -Wno-psabi
-Wloop-analysis -Wno-unneeded-internal-declaration
-Wno-deprecated-declarations -Wno-cast-function-type -Wno-vla-extension
-Wno-thread-safety-reference-return -Wno-deprecated-declarations
-Wno-unused-function -isystem/opt/homebrew/opt/libpng/include/libpng16
-std=c11 -c
../../../../../../libs/qt5/qtwebengine/src/3rdparty/chromium/third_party/freetype/src/src/autofit/autofit.c
-o obj/third_party/freetype/freetype_source/autofit.o
In file included from
../../../../../../libs/qt5/qtwebengine/src/3rdparty/chromium/third_party/freetype/src/src/autofit/autofit.c:21:
In file included from
../../../../../../libs/qt5/qtwebengine/src/3rdparty/chromium/third_party/freetype/src/src/autofit/ft-hb.c:32:
../../../../../../libs/qt5/qtwebengine/src/3rdparty/chromium/third_party/freetype/src/src/autofit/ft-hb.h:30:10:
fatal error: 'hb.h' file not found
#include <hb.h>
         ^~~~~~
1 error generated.

Best,

Marcel Gotsch
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