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kumquat-buildroot/package/flutter-engine/flutter-engine.mk
Adam Duskett 827da2242c package/flutter-engine: new package 
There are many issues with this package:

- The release tarballs from https://github.com/flutter/engine are in no state
  to compile. They are only for the use of gclient to download a source
  directory structure suitable to build the Flutter engine! If you download,
  extract and attempt to run `./tools/gn --no-goma --no-prebuilt-dart-sdk`, you
  receive the error message:
  `No such file or directory: 'flutter/flutter/third_party/gn/gn.'

  But wait! Wasn't the gn binary just called? No, that's a wrapper in the
  Flutter source tree that formats arguments to call the real gn binary.
  The real gn is not provided in the tarball but is downloaded via gclient
  (among many other supporting repositories.)

  Even worse, the flutter buildsystem depends on the .git dirs being present.
  (https://github.com/meta-flutter/meta-flutter/issues/271) This dependency
  means it is not possible to create a reproducible tarball from the downloaded
  sources, which is why there is no .hash file provided.

  I have asked the flutter project to release full tarballs suitable for
  compiling here: https://github.com/flutter/flutter/issues/130734

- Flutter engine includes a patched copy of clang that must be used to compile.
  Using a Buildroot-build clang results in linking warning and errors.
  As such, we depend on LLVM_ARCH_SUPPORTS but use the included clang for
  building. On the plus side, this saves time having to compile clang.

- flutter-engine relies on the "PUB_CACHE", that is provided by flutter-sdk,
  so we need a build dependency, even if no tool from host-flutter-sdk-bin
  is used to build flutter-engine

Tested with:
  - Debian 11 and 12
  - Ubuntu 18.04, 20.04, and 22.04
  - Fedora 38
  - Per-package directories

Signed-off-by: Adam Duskett <adam.duskett@amarulasolutions.com>
[yann.morin.1998@free.fr:
  - search gclient.py from PATH
  - indent shell script with 4 spaces
  - reorganise schell script with prepare/cleanup
  - tweak comment about weirdness of flutter buildsystem
  - use suitable-extactor and TAR_OPTIONS
  - use FLUTTER_SDK_BIN_PUB_CACHE
  - add dependency to host-futter-sdk-bin (Adam)
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
2023-09-30 00:11:58 +02:00

240 lines
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################################################################################
#
# flutter-engine
#
################################################################################
# Flutter-engine has a release on the GitHub page. However, that release is
# only for Google. Its intended purpose is for the gclient tool provided by
# Google in their depot-tools package. To use the source code, we must use
# gclient to download the flutter-engine source code along with several other
# projects. Unfortunately, the Buildroot download system does not have the
# capability of using gclient, and considering this package is the only
# package that uses gclient, we side-step the entire download process and
# perform the following steps if a tarball does not exist already:
#
# - Copy the pre-made gclient config file to a temporary scratch directory.
# - Run gclient sync to generate a source directory with the proper
# flutter-engine source code in the correct places.
# - Create a source tarball.
# - Copy the source tarball to the $(FLUTTER_ENGINE_DL_DIR) directory.
#
# There is no hash provided, as the gn binary (used for configuration) relies
# on the .git directories. As such, a reproducible tarball is not possible.
FLUTTER_ENGINE_VERSION = 3.13.4
# There is nothing for Buildroot to download. This is handled by gclient.
FLUTTER_ENGINE_SITE =
FLUTTER_ENGINE_SOURCE =
FLUTTER_ENGINE_LICENSE = BSD-3-Clause
FLUTTER_ENGINE_LICENSE_FILES = LICENSE
FLUTTER_ENGINE_TARBALL_PATH = $(FLUTTER_ENGINE_DL_DIR)/flutter-$(FLUTTER_ENGINE_VERSION).tar.gz
FLUTTER_ENGINE_INSTALL_STAGING = YES
FLUTTER_ENGINE_DOWNLOAD_DEPENDENCIES = host-depot-tools
FLUTTER_ENGINE_DEPENDENCIES = \
host-flutter-sdk-bin \
host-ninja \
host-pkgconf \
freetype \
zlib
# Dispatch all architectures of flutter
# FLUTTER_ENGINE_TARGET_TRIPPLE must match the directory name found in
# buildtools/linux-x64/clang/lib/clang/*/lib
ifeq ($(BR2_aarch64),y)
FLUTTER_ENGINE_TARGET_ARCH = arm64
FLUTTER_ENGINE_TARGET_TRIPPLE = aarch64-unknown-linux-gnu
else ifeq ($(BR2_arm)$(BR2_armeb),y)
FLUTTER_ENGINE_TARGET_ARCH = arm
FLUTTER_ENGINE_TARGET_TRIPPLE = armv7-unknown-linux-gnueabihf
else ifeq ($(BR2_x86_64),y)
FLUTTER_ENGINE_TARGET_ARCH = x64
FLUTTER_ENGINE_TARGET_TRIPPLE = x86_64-unknown-linux-gnu
endif
ifeq ($(BR2_ENABLE_RUNTIME_DEBUG),y)
FLUTTER_ENGINE_RUNTIME_MODE=debug
else
FLUTTER_ENGINE_RUNTIME_MODE=release
endif
FLUTTER_ENGINE_BUILD_DIR = \
$(@D)/out/linux_$(FLUTTER_ENGINE_RUNTIME_MODE)_$(FLUTTER_ENGINE_TARGET_ARCH)
FLUTTER_ENGINE_INSTALL_FILES = libflutter_engine.so
# Flutter engine includes a bundled patched clang that must be used for
# compiling or else there are linking errors.
FLUTTER_ENGINE_CLANG_PATH = $(@D)/buildtools/linux-x64/clang
FLUTTER_ENGINE_CONF_OPTS = \
--clang \
--embedder-for-target \
--linux-cpu $(FLUTTER_ENGINE_TARGET_ARCH) \
--no-build-embedder-examples \
--no-clang-static-analyzer \
--no-enable-unittests \
--no-goma \
--no-prebuilt-dart-sdk \
--no-stripped \
--runtime-mode $(FLUTTER_ENGINE_RUNTIME_MODE) \
--target-os linux \
--target-sysroot $(STAGING_DIR) \
--target-toolchain $(FLUTTER_ENGINE_CLANG_PATH) \
--target-triple $(FLUTTER_ENGINE_TARGET_TRIPPLE)
ifeq ($(BR2_arm)$(BR2_armeb),y)
FLUTTER_ENGINE_CONF_OPTS += \
--arm-float-abi $(call qstrip,$(BR2_GCC_TARGET_FLOAT_ABI))
endif
# We must specify a full path to ccache and a full path to the flutter-engine
# provided clang in order to use ccache, or else flutter-engine will error out
# attempting to find ccache in the target-toolchain provided path.
ifeq ($(BR2_CCACHE),y)
define FLUTTER_ENGINE_COMPILER_PATH_FIXUP
$(SED) "s%cc =.*%cc = \"$(HOST_DIR)/bin/ccache $(FLUTTER_ENGINE_CLANG_PATH)/bin/clang\""%g \
$(@D)/build/toolchain/custom/BUILD.gn
$(SED) "s%cxx =.*%cxx = \"$(HOST_DIR)/bin/ccache $(FLUTTER_ENGINE_CLANG_PATH)/bin/clang++\""%g \
$(@D)/build/toolchain/custom/BUILD.gn
endef
FLUTTER_ENGINE_PRE_CONFIGURE_HOOKS += FLUTTER_ENGINE_COMPILER_PATH_FIXUP
endif
ifeq ($(BR2_ENABLE_LTO),y)
FLUTTER_ENGINE_CONF_OPTS += --lto
else
FLUTTER_ENGINE_CONF_OPTS += --no-lto
endif
ifeq ($(BR2_OPTIMIZE_0),y)
FLUTTER_ENGINE_CONF_OPTS += --unoptimized
endif
# There is no --disable-fontconfig option.
ifeq ($(BR2_PACKAGE_FONTCONFIG),y)
FLUTTER_ENGINE_DEPENDENCIES += fontconfig
FLUTTER_ENGINE_CONF_OPTS += --enable-fontconfig
endif
ifeq ($(BR2_PACKAGE_HAS_LIBGL),y)
FLUTTER_ENGINE_DEPENDENCIES += libgl
endif
ifeq ($(BR2_PACKAGE_HAS_LIBGLES),y)
FLUTTER_ENGINE_DEPENDENCIES += libgles
endif
ifeq ($(BR2_PACKAGE_LIBGLFW),y)
FLUTTER_ENGINE_DEPENDENCIES += libglfw
FLUTTER_ENGINE_CONF_OPTS += --build-glfw-shell
else
FLUTTER_ENGINE_CONF_OPTS += --no-build-glfw-shell
endif
ifeq ($(BR2_PACKAGE_LIBGTK3),y)
FLUTTER_ENGINE_DEPENDENCIES += libgtk3
FLUTTER_ENGINE_INSTALL_FILES += libflutter_linux_gtk.so
else
FLUTTER_ENGINE_CONF_OPTS += --disable-desktop-embeddings
endif
# There is no --disable-vulkan option
ifeq ($(BR2_PACKAGE_MESA3D_VULKAN_DRIVER),y)
FLUTTER_ENGINE_CONF_OPTS += --enable-vulkan
endif
ifeq ($(BR2_PACKAGE_XORG7)$(BR2_PACKAGE_LIBXCB),yy)
FLUTTER_ENGINE_DEPENDENCIES += libxcb
else
define FLUTTER_ENGINE_VULKAN_X11_SUPPORT_FIXUP
$(SED) "s%vulkan_use_x11.*%vulkan_use_x11 = false%g" -i \
$(@D)/build_overrides/vulkan_headers.gni
endef
FLUTTER_ENGINE_PRE_CONFIGURE_HOOKS += FLUTTER_ENGINE_VULKAN_X11_SUPPORT_FIXUP
endif
ifeq ($(BR2_PACKAGE_WAYLAND),y)
FLUTTER_ENGINE_DEPENDENCIES += wayland
else
define FLUTTER_ENGINE_VULKAN_WAYLAND_SUPPORT_FIXUP
$(SED) "s%vulkan_use_wayland.*%vulkan_use_wayland = false%g" \
$(@D)/build_overrides/vulkan_headers.gni
endef
FLUTTER_ENGINE_PRE_CONFIGURE_HOOKS += FLUTTER_ENGINE_VULKAN_WAYLAND_SUPPORT_FIXUP
endif
# Generate a tarball if one does not already exist.
define FLUTTER_ENGINE_GENERATE_TARBALL
PATH=$(HOST_DIR)/share/depot_tools:$(BR_PATH) \
PYTHONPATH=$(HOST_DIR)/lib/python$(PYTHON3_VERSION_MAJOR) \
PUB_CACHE=$(FLUTTER_SDK_BIN_PUB_CACHE) \
$(FLUTTER_ENGINE_PKGDIR)/gen-tarball \
--dot-gclient $(TOPDIR)/$(FLUTTER_ENGINE_PKGDIR)/dot-gclient \
--jobs $(PARALLEL_JOBS) \
--scratch-dir $(@D)/dl-tmp \
--tarball-dl-path $(FLUTTER_ENGINE_TARBALL_PATH) \
--version $(FLUTTER_ENGINE_VERSION)
endef
FLUTTER_ENGINE_POST_DOWNLOAD_HOOKS += FLUTTER_ENGINE_GENERATE_TARBALL
define FLUTTER_ENGINE_EXTRACT_CMDS
$(call suitable-extractor,$(FLUTTER_ENGINE_TARBALL_PATH)) $(FLUTTER_ENGINE_TARBALL_PATH) \
| $(TAR) --strip-components=1 -C $(@D) $(TAR_OPTIONS) -
endef
define FLUTTER_ENGINE_CONFIGURE_CMDS
cd $(@D) && \
rm -rf $(FLUTTER_ENGINE_BUILD_DIR) && \
PATH=$(HOST_DIR)/share/depot_tools:$(BR_PATH) \
PUB_CACHE=$(FLUTTER_SDK_BIN_PUB_CACHE) \
./flutter/tools/gn \
$(FLUTTER_ENGINE_CONF_OPTS)
endef
define FLUTTER_ENGINE_BUILD_CMDS
cd $(@D) && \
PATH=$(HOST_DIR)/share/depot_tools:$(BR_PATH) \
PUB_CACHE=$(FLUTTER_SDK_BIN_PUB_CACHE) \
$(HOST_DIR)/bin/ninja \
-j $(PARALLEL_JOBS) \
-C $(FLUTTER_ENGINE_BUILD_DIR)
endef
# Flutter-engine builds several host applications use for flutter development.
# One of those applications is gen_snapshot, which turns applications into
# usable .so files for the target architecture. Compiling a host version of
# flutter-engine would result in binaries producing host-architecture
# flutter applications .so files. As such, copy gen_snapshot to the host
# directory here and name it flutter_gen_snapshot for clarity.
FLUTTER_ENGINE_GEN_SNAPSHOT = $(HOST_DIR)/bin/flutter_gen_snapshot
define FLUTTER_ENGINE_INSTALL_GEN_SNAPSHOT
$(INSTALL) -D -m 0755 $(FLUTTER_ENGINE_BUILD_DIR)/clang_x64/gen_snapshot \
$(HOST_DIR)/bin/flutter_gen_snapshot
endef
FLUTTER_ENGINE_POST_INSTALL_STAGING_HOOKS += FLUTTER_ENGINE_INSTALL_GEN_SNAPSHOT
define FLUTTER_ENGINE_INSTALL_STAGING_CMDS
$(foreach i,$(FLUTTER_ENGINE_INSTALL_FILES),
$(INSTALL) -D -m 0755 $(FLUTTER_ENGINE_BUILD_DIR)/so.unstripped/$(i) \
$(STAGING_DIR)/usr/lib/$(i); \
)
$(INSTALL) -D -m 0755 $(FLUTTER_ENGINE_BUILD_DIR)/flutter_embedder.h \
$(STAGING_DIR)/usr/include/flutter_embedder.h
$(INSTALL) -D -m 0755 $(FLUTTER_ENGINE_BUILD_DIR)/icudtl.dat \
$(STAGING_DIR)/usr/share/flutter/$(FLUTTER_ENGINE_RUNTIME_MODE)/data/icudtl.dat
endef
define FLUTTER_ENGINE_INSTALL_TARGET_CMDS
$(foreach i,$(FLUTTER_ENGINE_INSTALL_FILES),
$(INSTALL) -D -m 0755 $(FLUTTER_ENGINE_BUILD_DIR)/so.unstripped/$(i) \
$(TARGET_DIR)/usr/lib/$(i); \
)
$(INSTALL) -D -m 0755 $(FLUTTER_ENGINE_BUILD_DIR)/icudtl.dat \
$(TARGET_DIR)/usr/share/flutter/$(FLUTTER_ENGINE_RUNTIME_MODE)/data/icudtl.dat
endef
$(eval $(generic-package))
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