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### Usage
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To build dependencies for the current arch+OS:
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```bash
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make
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```
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To build for another arch/OS:
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```bash
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make HOST=host-platform-triplet
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```
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For example:
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```bash
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make HOST=x86_64-w64-mingw32 -j4
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```
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A toolchain will be generated that's suitable for plugging into Monero's
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cmake. In the above example, a dir named x86_64-w64-mingw32 will be
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created. To use it for Monero:
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```bash
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cmake -DCMAKE_TOOLCHAIN=`pwd`/contrib/depends/x86_64-w64-mingw32
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```
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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 32 bit
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- `aarch64-linux-gnu` for Linux ARM 64 bit
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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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```
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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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DEBUG: disable some optimizations and enable more runtime checking
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HOST_ID_SALT: Optional salt to use when generating host package ids
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BUILD_ID_SALT: Optional salt to use when generating build package ids
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```
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Additional targets:
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```
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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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```
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#Darwin (macos) builds:
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To build with the x86_64-apple-darwin11 you require the mac os developer tools in MacOSX10.11.sdk.
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Download it from apple, or search for it on github. Create a new directoty called SDKs in this
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directory and place the entire MacOSX10.11.sdk folder in it. The depends build will then pick it up automatically
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(without requiring SDK_PATH).
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#Mingw builds
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Building for 32/64bit mingw requires switching alternatives to a posix mode
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```bash
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update-alternatives --set x86_64-w64-mingw32-g++ x86_64-w64-mingw32-g++-posix
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update-alternatives --set x86_64-w64-mingw32-gcc x86_64-w64-mingw32-gcc-posix
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```
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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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