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dash/depends/README.md
fanquake 1aa025f402
Merge #19617: doc: Clang 8 or later is required with FORCE_USE_SYSTEM_CLANG 
e60ef21b8a0f62ebc2e0bdbb5943fa80cc4d98b2 doc: Clang 8 or later is required with FORCE_USE_SYSTEM_CLANG (fanquake)

Pull request description:

  The usage of pragmas within the macOS SDK requires LLVM Clang 8. This is
  the same version as our prebuilt Clang, however the minimum is worth noting
  here as they may diverge and/or expert users might expect they could use an
  earlier version.

  If you compile depends using `FORCE_USE_SYSTEM_CLANG=1` and Clang 7 you'll see output like:
  ```bash
  In file included from kernel/qcore_mac_objc.mm:44:
  In file included from /bitcoin/depends/SDKs/Xcode-11.3.1-11C505-extracted-SDK-with-libcxx-headers/System/Library/Frameworks/AppKit.framework/Headers/NSText.h:9:
  In file included from /bitcoin/depends/SDKs/Xcode-11.3.1-11C505-extracted-SDK-with-libcxx-headers/System/Library/Frameworks/AppKit.framework/Headers/NSView.h:19:
  In file included from /bitcoin/depends/SDKs/Xcode-11.3.1-11C505-extracted-SDK-with-libcxx-headers/System/Library/Frameworks/AppKit.framework/Headers/NSResponder.h:10:
  /bitcoin/depends/SDKs/Xcode-11.3.1-11C505-extracted-SDK-with-libcxx-headers/System/Library/Frameworks/AppKit.framework/Headers/NSEvent.h:19:1: error:
        expected 'push' or 'pop' after '#pragma clang attribute'
  /bitcoin/depends/SDKs/Xcode-11.3.1-11C505-extracted-SDK-with-libcxx-headers/usr/include/os/availability.h:104:273: note: expanded from macro
        'API_UNAVAILABLE_BEGIN'
    ...__API_UNAVAILABLE_BEGIN5, __API_UNAVAILABLE_BEGIN4, __API_UNAVAILABLE_BEGIN3, __API_UNAVAILABLE_BEGIN2, __API_UNAVAILABLE_BEGIN1, 0)(__VA_A...
                                                                                                               ^
  fatal error: too many errors emitted, stopping now [-ferror-limit=]
  20 errors generated.
  ```

  I've got a [godbolt here](https://godbolt.org/z/j6r987) that contains a demo of the issue (based off the macOS SDK). It will compile with Clang 8 but not with Clang 7.

ACKs for top commit:
  laanwj:
    ACK e60ef21b8a0f62ebc2e0bdbb5943fa80cc4d98b2

Tree-SHA512: affc082a4b28d9cd102a844e10f63f55f0f20a9f840e5d8037a41470ad1ea83edc3075ce262b1d618c59c9b75445e52ddd9ba9f84c5ac3da9ce20681473c47b1
2021-09-18 21:46:26 -04:00

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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

A prefix will be generated that's suitable for plugging into Dash's configure. In the above example, a dir named x86_64-w64-mingw32 will be created. To use it for Dash:

./configure --prefix=`pwd`/depends/x86_64-w64-mingw32

Common host-platform-triplets for cross compilation are:

  • x86_64-w64-mingw32 for Win64
  • x86_64-apple-darwin18 for macOS
  • arm-linux-gnueabihf for Linux ARM 32 bit
  • aarch64-linux-gnu for Linux ARM 64 bit
  • riscv32-linux-gnu for Linux RISC-V 32 bit
  • riscv64-linux-gnu for Linux RISC-V 64 bit

No other options are needed, the paths are automatically configured.

Install the required dependencies: Ubuntu & Debian

For macOS cross compilation:

sudo apt-get install curl librsvg2-bin libtiff-tools bsdmainutils imagemagick libcap-dev libz-dev libbz2-dev python3-setuptools libtinfo5

For Win64 cross compilation:

For linux (including i386, ARM) cross compilation:

sudo apt-get install curl g++-aarch64-linux-gnu g++-4.8-aarch64-linux-gnu gcc-4.8-aarch64-linux-gnu binutils-aarch64-linux-gnu g++-arm-linux-gnueabihf g++-4.8-arm-linux-gnueabihf gcc-4.8-arm-linux-gnueabihf binutils-arm-linux-gnueabihf g++-4.8-multilib gcc-4.8-multilib binutils-gold bsdmainutils

For linux RISC-V 64-bit cross compilation (there are no packages for 32-bit):

sudo apt-get install curl g++-riscv64-linux-gnu binutils-riscv64-linux-gnu

RISC-V known issue: gcc-7.3.0 and gcc-7.3.1 result in a broken test_dash executable (see https://github.com/bitcoin/bitcoin/pull/13543), this is apparently fixed in gcc-8.1.0.

Dependency Options: The following can be set when running make: make FOO=bar

SOURCES_PATH
downloaded sources will be placed here
BASE_CACHE
built packages will be placed here
SDK_PATH
Path where sdk's can be found (used by macOS)
FALLBACK_DOWNLOAD_PATH
If a source file can't be fetched, try here before giving up
NO_QT
Don't download/build/cache qt and its dependencies
NO_WALLET
Don't download/build/cache libs needed to enable the wallet
NO_UPNP
Don't download/build/cache packages needed for enabling upnp
DEBUG
disable some optimizations and enable more runtime checking
HOST_ID_SALT
Optional salt to use when generating host package ids
BUILD_ID_SALT
Optional salt to use when generating build package ids
FORCE_USE_SYSTEM_CLANG
(EXPERTS ONLY) When cross-compiling for macOS, use Clang found in the system's $PATH rather 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 Dash Core'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

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