09ac6c81be
11736dbe3dbe34bcb430d05810b9e9aa66ec1cd6 build, qt: Hardcode last modified timestamp in Qt RCC (Hennadii Stepanov)
Pull request description:
Our Guix build system sets the [`SOURCE_DATE_EPOCH`](https://reproducible-builds.org/specs/source-date-epoch/) and propagates it to the depends build subsystem. Its [default value](https://github.com/bitcoin/bitcoin/blob/master/contrib/guix/README.md#recognized-environment-variables) is the top commit timestamp.
After bumping Qt version up to 5.15.2, due to [this](1ffcca4cc2) change, every time they are going to make new Guix builds for another branch/commit they must ensure that the `qt` package will be rebuilt from scratch. Otherwise, Bitcoin Core GUI binaries will be non-deterministic.
Such behavior makes working with Guix builds suboptimal.
This PR fixes the described issue by patching Qt RCC and hardcoding last modified timestamps with `1`.
It's worth to mention that this change is compatible with a possible future [improvement](https://github.com/bitcoin/bitcoin/pull/21995) which makes each dependency package reproducible.
A drawback of such an approach is not currently applied to our project, as it effectively makes [QML cache files](https://bugreports.qt.io/browse/QTBUG-57182) useless. I can't say it's a problem for the https://github.com/bitcoin-core/gui-qml project.
---
**A note for thinkers:** For now this change is enough as only Qt source contains `SOURCE_DATE_EPOCH`. But in general we should re-think about treating the `SOURCE_DATE_EPOCH` variable in the depends build subsystem. For instance, its default value could be the output of `git log --format=%at -1 -- depends`.
ACKs for top commit:
fanquake:
ACK 11736dbe3dbe34bcb430d05810b9e9aa66ec1cd6
Tree-SHA512: 31f104010a0a78d217aafcc5bc4606351f9060fc2a827277935b85fc8ced9f3d90a31d812c7db8c2711fb6daccd279cf0945dc1d7a7199e0eb0ade451cdbcd5d
Usage
To build dependencies for the current arch+OS:
make
To build for another arch/OS:
make HOST=host-platform-triplet
For example:
make HOST=x86_64-w64-mingw32 -j4
Bitcoin Core's configure script by default will ignore the depends output. In
order for it to pick up libraries, tools, and settings from the depends build,
you must set the CONFIG_SITE environment variable to point to a config.site settings file.
In the above example, a file named depends/x86_64-w64-mingw32/share/config.site will be
created. To use it during compilation:
CONFIG_SITE=$PWD/depends/x86_64-w64-mingw32/share/config.site ./configure
The default install prefix when using config.site is --prefix=depends/<host-platform-triplet>,
so depends build outputs will be installed in that location.
Common host-platform-triplets for cross compilation are:
i686-pc-linux-gnufor Linux 32 bitx86_64-pc-linux-gnufor x86 Linuxx86_64-w64-mingw32for Win64x86_64-apple-darwinfor macOSarm-linux-gnueabihffor Linux ARM 32 bitaarch64-linux-gnufor Linux ARM 64 bitpowerpc64-linux-gnufor Linux POWER 64-bit (big endian)powerpc64le-linux-gnufor Linux POWER 64-bit (little endian)riscv32-linux-gnufor Linux RISC-V 32 bitriscv64-linux-gnufor Linux RISC-V 64 bits390x-linux-gnufor Linux S390Xarmv7a-linux-androidfor Android ARM 32 bitaarch64-linux-androidfor Android ARM 64 bitx86_64-linux-androidfor Android x86 64 bit
The paths are automatically configured and no other options are needed unless targeting Android.
Install the required dependencies: Ubuntu & Debian
For macOS cross compilation
sudo apt-get install curl librsvg2-bin libtiff-tools bsdmainutils cmake imagemagick libz-dev python3-setuptools libtinfo5 xorriso
Note: You must obtain the macOS SDK before proceeding with a cross-compile.
Under the depends directory, create a subdirectory named SDKs.
Then, place the extracted SDK under this new directory.
For more information, see SDK Extraction.
For Win64 cross compilation
- see build-windows.md
For linux (including i386, ARM) cross compilation
Common linux dependencies:
sudo apt-get install make automake cmake curl g++-multilib libtool binutils-gold bsdmainutils pkg-config python3 patch bison
For linux ARM cross compilation:
sudo apt-get install g++-arm-linux-gnueabihf binutils-arm-linux-gnueabihf
For linux AARCH64 cross compilation:
sudo apt-get install g++-aarch64-linux-gnu binutils-aarch64-linux-gnu
For linux POWER 64-bit cross compilation (there are no packages for 32-bit):
sudo apt-get install g++-powerpc64-linux-gnu binutils-powerpc64-linux-gnu g++-powerpc64le-linux-gnu binutils-powerpc64le-linux-gnu
For linux RISC-V 64-bit cross compilation (there are no packages for 32-bit):
sudo apt-get install g++-riscv64-linux-gnu binutils-riscv64-linux-gnu
For linux S390X cross compilation:
sudo apt-get install g++-s390x-linux-gnu binutils-s390x-linux-gnu
Dependency Options
The following can be set when running make: make FOO=bar
SOURCES_PATH: Downloaded sources will be placed hereBASE_CACHE: Built packages will be placed hereSDK_PATH: Path where SDKs can be found (used by macOS)FALLBACK_DOWNLOAD_PATH: If a source file can't be fetched, try here before giving upNO_QT: Don't download/build/cache Qt and its dependenciesNO_QR: Don't download/build/cache packages needed for enabling qrencodeNO_ZMQ: Don't download/build/cache packages needed for enabling ZeroMQNO_WALLET: Don't download/build/cache libs needed to enable the walletNO_BDB: Don't download/build/cache BerkeleyDBNO_SQLITE: Don't download/build/cache SQLiteNO_UPNP: Don't download/build/cache packages needed for enabling UPnPNO_NATPMP: Don't download/build/cache packages needed for enabling NAT-PMPALLOW_HOST_PACKAGES: Packages that are missed in dependencies (due toNO_*option or build script logic) are searched for among the host system packages usingpkg-config. It allows building with packages of other (newer) versionsMULTIPROCESS: Build libmultiprocess (experimental, requires CMake)DEBUG: Disable some optimizations and enable more runtime checkingHOST_ID_SALT: Optional salt to use when generating host package idsBUILD_ID_SALT: Optional salt to use when generating build package idsFORCE_USE_SYSTEM_CLANG: (EXPERTS ONLY) When cross-compiling for macOS, use Clang found in the system's$PATHrather than the default prebuilt release of Clang from llvm.org. Clang 8 or later is required.
If some packages are not built, for example make NO_WALLET=1, the appropriate
options will be passed to bitcoin's configure. In this case, --disable-wallet.
Additional targets
download: run 'make download' to fetch all sources without building them
download-osx: run 'make download-osx' to fetch all sources needed for macOS builds
download-win: run 'make download-win' to fetch all sources needed for win builds
download-linux: run 'make download-linux' to fetch all sources needed for linux builds
Other documentation
- description.md: General description of the depends system
- packages.md: Steps for adding packages