Differential D22975 Diff 66253 head/share/man/man7/arch.7

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head/share/man/man7/arch.7

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	type machine representation uses 4 bytes,			type machine representation uses 4 bytes,
	while			while
	.Vt long			.Vt long
	and			and
	.Vt void *			.Vt void *
	are 8 bytes.			are 8 bytes.
	.El			.El
	.Pp			.Pp
	Compilers define the
	.Dv _LP64
	symbol when compiling for an
	.Dv LP64
	ABI.
	.Pp
	Some machines support more than one			Some machines support more than one
	.Fx			.Fx
	ABI.			ABI.
	Typically these are 64-bit machines, where the			Typically these are 64-bit machines, where the
	.Dq native			.Dq native
	.Dv LP64			.Dv LP64
	execution environment is accompanied by the			execution environment is accompanied by the
	.Dq legacy			.Dq legacy
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	.Ss Important Xr make 1 variables			.Ss Important Xr make 1 variables
	Most of the externally settable variables are defined in the			Most of the externally settable variables are defined in the
	.Xr build 7			.Xr build 7
	man page.			man page.
	These variables are not otherwise documented and are used extensively			These variables are not otherwise documented and are used extensively
	in the build system.			in the build system.
	.Bl -tag -width "MACHINE_CPUARCH"			.Bl -tag -width "MACHINE_CPUARCH"
	.It Dv MACHINE			.It Dv MACHINE
	Represent the hardware platform.			Represents the hardware platform.
	This is the same as the native platform's			This is the same as the native platform's
	.Xr uname 1			.Xr uname 1
	.Fl m			.Fl m
	output.			output.
	It defines both the userland / kernel interface, as well as the			It defines both the userland / kernel interface, as well as the
	bootloader / kernel interface.			bootloader / kernel interface.
	It should only be used in these contexts.			It should only be used in these contexts.
	Each CPU architecture may have multiple hardware platforms it supports			Each CPU architecture may have multiple hardware platforms it supports
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