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38 lines
1.5 KiB
Text
38 lines
1.5 KiB
Text
## Building
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Usual Makefile project. This project does not require a configure phase.
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### Special optional variables
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# `PLATFORM`
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Darwin version to target against. Detected automatically, but can also
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be overridden manually to test builds for other OS versions.
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(This is not the macOS version.)
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# `FORCE_ARCH`
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Architecture to build for. Accepts a single value, not a list.
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If your `lipo` binary is new enough and supports the `-archs` flag, you will
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not need to use this variable. Instead, directly build the software
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universally in one pass using the usual `-arch` compiler flags. The
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autodetection, split and merge features will then handle the different
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architectures automatically.
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Older versions of `lipo` do not support the `-archs` flag, so automatic
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architecture detection via binary/object file inspection is not be possible
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on older platforms.
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In order to avoid an additional dependency on the `cctools` port
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to provide a newer `lipo` version, this variable was introduced.
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It disables the automatic architecture detection feature and instead
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hardcodes the contained value as the target architecture.
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Within `MacPorts`, we use it in multi-architecture builds with one
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pass per architecture. Finally, the `MacPorts ``muniversal` PortGroup
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will merge the resulting binaries into one fat/universal binary automatically.
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Some symbols must be built multiple times. Each variant will use a different
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data layout and have a special postfix appended to it. The data layouts
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supported and needed depend upon the architecture and (target) OS version.
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