doc: Documentation in Markdown for Depends Dir
Documentation more readable when viewed on Github. Some extra changes by @laanwj: - Make README.usage the default README. This is more convenient from a user perspective. Link to other documentation in this default README - Add list of popular targets for cross compilation, change default to Win64 instead of Win32
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Shawn Wilkinson
Wladimir J. van der Laan
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b4c219b622
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4 changed files with 137 additions and 100 deletions
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depends/README.md
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56
depends/README.md
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### Usage
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To build dependencies for the current arch+OS:
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make
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To build for another arch/OS:
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make HOST=host-platform-triplet
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For example:
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make HOST=x86_64-w64-mingw32 -j4
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A prefix will be generated that's suitable for plugging into Bitcoin's
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configure. In the above example, a dir named i686-w64-mingw32 will be
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created. To use it for Bitcoin:
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./configure --prefix=`pwd`/depends/x86_64-w64-mingw32
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Common `host-platform-triplets` for cross compilation are:
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- `i686-w64-mingw32` for Win32
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- `x86_64-w64-mingw32` for Win64
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- `x86_64-apple-darwin11` for MacOSX
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- `arm-linux-gnueabihf` for Linux ARM
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No other options are needed, the paths are automatically configured.
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Dependency Options:
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The following can be set when running make: make FOO=bar
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SOURCES_PATH: downloaded sources will be placed here
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BASE_CACHE: built packages will be placed here
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SDK_PATH: Path where sdk's can be found (used by OSX)
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FALLBACK_DOWNLOAD_PATH: If a source file can't be fetched, try here before giving up
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NO_QT: Don't download/build/cache qt and its dependencies
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NO_WALLET: Don't download/build/cache libs needed to enable the wallet
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NO_UPNP: Don't download/build/cache packages needed for enabling upnp
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DEBUG: disable some optimizations and enable more runtime checking
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If some packages are not built, for example `make NO_WALLET=1`, the appropriate
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options will be passed to bitcoin's configure. In this case, `--disable-wallet`.
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Additional targets:
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download: run 'make download' to fetch all sources without building them
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download-osx: run 'make download-osx' to fetch all sources needed for osx builds
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download-win: run 'make download-win' to fetch all sources needed for win builds
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download-linux: run 'make download-linux' to fetch all sources needed for linux builds
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### Other documentation
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- [description.md](description.md): General description of the depends system
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- [packages.md](packages.md): Steps for adding packages
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@ -1,34 +0,0 @@
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To build dependencies for the current arch+OS:
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make
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To build for another arch/OS:
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make HOST=host-platform-triplet && make HOST=host-platform-triplet
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(For example: make HOST=i686-w64-mingw32 -j4)
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A prefix will be generated that's suitable for plugging into Bitcoin's
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configure. In the above example, a dir named i686-w64-mingw32 will be
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created. To use it for Bitcoin:
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./configure --prefix=`pwd`/depends/i686-w64-mingw32
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No other options are needed, the paths are automatically configured.
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Dependency Options:
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The following can be set when running make: make FOO=bar
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SOURCES_PATH: downloaded sources will be placed here
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BASE_CACHE: built packages will be placed here
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SDK_PATH: Path where sdk's can be found (used by OSX)
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FALLBACK_DOWNLOAD_PATH: If a source file can't be fetched, try here before giving up
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NO_QT: Don't download/build/cache qt and its dependencies
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NO_WALLET: Don't download/build/cache libs needed to enable the wallet
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NO_UPNP: Don't download/build/cache packages needed for enabling upnp
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DEBUG: disable some optimizations and enable more runtime checking
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If some packages are not built, for example 'make NO_WALLET=1', the appropriate
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options will be passed to bitcoin's configure. In this case, --disable-wallet.
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Additional targets:
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download: run 'make download' to fetch all sources without building them
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download-osx: run 'make download-osx' to fetch all sources needed for osx builds
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download-win: run 'make download-win' to fetch all sources needed for win builds
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download-linux: run 'make download-linux' to fetch all sources needed for linux builds
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@ -1,9 +1,7 @@
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This is a system of building and caching dependencies necessary for building
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Bitcoin.
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This is a system of building and caching dependencies necessary for building Bitcoin.
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There are several features that make it different from most similar systems:
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- It is designed to be builder and host agnostic
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### It is designed to be builder and host agnostic
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In theory, binaries for any target OS/architecture can be created, from a
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builder running any OS/architecture. In practice, build-side tools must be
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@ -11,18 +9,18 @@ specified when the defaults don't fit, and packages must be amended to work
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on new hosts. For now, a build architecture of x86_64 is assumed, either on
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Linux or OSX.
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- No reliance on timestamps
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### No reliance on timestamps
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File presence is used to determine what needs to be built. This makes the
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results distributable and easily digestable by automated builders.
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- Each build only has its specified dependencies available at build-time.
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### Each build only has its specified dependencies available at build-time.
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For each build, the sysroot is wiped and the (recursive) dependencies are
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installed. This makes each build deterministic, since there will never be any
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unknown files available to cause side-effects.
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- Each package is cached and only rebuilt as needed.
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### Each package is cached and only rebuilt as needed.
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Before building, a unique build-id is generated for each package. This id
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consists of a hash of all files used to build the package (Makefiles, packages,
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@ -32,7 +30,7 @@ any other package that depends on it. If any of the main makefiles (Makefile,
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funcs.mk, etc) are changed, all packages will be rebuilt. After building, the
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results are cached into a tarball that can be re-used and distributed.
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- Package build results are (relatively) deterministic.
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### Package build results are (relatively) deterministic.
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Each package is configured and patched so that it will yield the same
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build-results with each consequent build, within a reasonable set of
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@ -41,13 +39,13 @@ beyond the scope of this system. Additionally, the toolchain itself must be
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capable of deterministic results. When revisions are properly bumped, a cached
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build should represent an exact single payload.
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- Sources are fetched and verified automatically
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### Sources are fetched and verified automatically
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Each package must define its source location and checksum. The build will fail
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if the fetched source does not match. Sources may be pre-seeded and/or cached
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as desired.
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- Self-cleaning
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### Self-cleaning
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Build and staging dirs are wiped after use, and any previous version of a
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cached result is removed following a successful build. Automated builders
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@ -4,37 +4,47 @@ variables, and defining build commands.
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The package "mylib" will be used here as an example
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General tips:
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mylib_foo is written as $(package)_foo in order to make recipes more similar.
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- mylib_foo is written as $(package)_foo in order to make recipes more similar.
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Identifiers:
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## Identifiers
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Each package is required to define at least these variables:
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$(package)_version:
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Version of the upstream library or program. If there is no version, a
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placeholder such as 1.0 can be used.
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$(package)_download_path:
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Location of the upstream source, without the file-name. Usually http or
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ftp.
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$(package)_file_name:
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The upstream source filename available at the download path.
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$(package)_sha256_hash:
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The sha256 hash of the upstream file
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These variables are optional:
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$(package)_build_subdir:
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cd to this dir before running configure/build/stage commands.
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$(package)_download_file:
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The file-name of the upstream source if it differs from how it should be
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stored locally. This can be used to avoid storing file-names with strange
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characters.
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$(package)_dependencies:
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Names of any other packages that this one depends on.
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$(package)_patches:
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Filenames of any patches needed to build the package
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$(package)_extra_sources:
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Any extra files that will be fetched via $(package)_fetch_cmds. These are
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specified so that they can be fetched and verified via 'make download'.
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Build Variables:
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## Build Variables:
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After defining the main identifiers, build variables may be added or customized
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before running the build commands. They should be added to a function called
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$(package)_set_vars. For example:
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@ -52,6 +62,7 @@ the modifications specific to that case. For example:
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x86_64 linux only: $(package)_x86_64_linux_cc = gcc
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These variables may be set to override or append their default values.
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$(package)_cc
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$(package)_cxx
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$(package)_objc
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@ -75,20 +86,19 @@ commands.
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Many variables respect a debug/release suffix as well, in order to use them for
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only the appropriate build config. For example:
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$(package)_cflags_release = -O3
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$(package)_cflags_i686_debug = -g
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$(package)_config_opts_release = --disable-debug
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These will be used in addition to the options that do not specify
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debug/release. All builds are considered to be release unless DEBUG=1 is set by
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the user.
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the user. Other variables may be defined as needed.
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Other variables may be defined as needed.
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Build commands:
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## Build commands:
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For each build, a unique build dir and staging dir are created. For example,
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work/build/mylib/1.0-1adac830f6e and work/staging/mylib/1.0-1adac830f6e.
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`work/build/mylib/1.0-1adac830f6e` and `work/staging/mylib/1.0-1adac830f6e`.
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The following build commands are available for each recipe:
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Runs from: build dir
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Fetch the source file. If undefined, it will be fetched and verified
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against its hash.
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$(package)_extract_cmds:
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Runs from: build dir
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Verify the source file against its hash and extract it. If undefined, the
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source is assumed to be a tarball.
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$(package)_preprocess_cmds:
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Runs from: build dir/$(package)_build_subdir
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Preprocess the source as necessary. If undefined, does nothing.
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$(package)_config_cmds:
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Runs from: build dir/$(package)_build_subdir
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Configure the source. If undefined, does nothing.
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$(package)_build_cmds:
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Runs from: build dir/$(package)_build_subdir
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Build the source. If undefined, does nothing.
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$(package)_stage_cmds:
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Runs from: build dir/$(package)_build_subdir
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Stage the build results. If undefined, does nothing.
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The following variables are available for each recipe:
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$(1)_staging_dir: package's destination sysroot path
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$(1)_staging_prefix_dir: prefix path inside of the package's staging dir
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$(1)_extract_dir: path to the package's extracted sources
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$($(package)_config_opts) will be appended.
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Most autotools projects can be properly staged using:
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$(MAKE) DESTDIR=$($(package)_staging_dir) install
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