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Formatting fixes for tables, no content changes.

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- Add missing .Pp after the end of some lists so that there is a blank
  line before the subsequent paragraph.
- Use a more typical '-tag' bullet list of the make variable descriptions
  at the end.  This adds separation between bullets and is the formatting
  typically used in manpages for this sort of list.
This commit is contained in:
John Baldwin 2019-12-30 22:05:57 +00:00
parent 2a55bade0e
commit 15d641f076
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=356209
1 changed files with 18 additions and 8 deletions
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26
share/man/man7/arch.7
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@ -139,6 +139,7 @@ and
.Vt void *
are 8 bytes.
.El
.Pp
Compilers define the
.Dv _LP64
symbol when compiling for an
@ -163,6 +164,7 @@ Examples are:
.It Dv mips64* Ta Dv mips*
.It Dv aarch64 Ta Dv armv6/armv7
.El
.Pp
.Dv aarch64
will support execution of
.Dv armv6
@ -184,6 +186,7 @@ On all supported architectures:
.It float Ta 4
.It double Ta 8
.El
.Pp
Integers are represented in two's complement.
Alignment of integer and pointer types is natural, that is,
the address of the variable must be congruent to zero modulo the type size.
@ -421,8 +424,9 @@ Most of the externally settable variables are defined in the
man page.
These variables are not otherwise documented and are used extensively
in the build system.
.Bl -column -offset indent "Sy Variable" "Sy Meaning and usage"
.It Dv MACHINE Represent the hardware platform.
.Bl -tag -width "MACHINE_CPUARCH"
.It Dv MACHINE
Represent the hardware platform.
This is the same as the native platform's
.Xr uname 1
.Fl m
@ -457,7 +461,8 @@ Generally,
.Dv MACHINE
should only be used in src/sys and src/stand or in system imagers or
installers.
.It Dv MACHINE_ARCH Represents the CPU processor architecture.
.It Dv MACHINE_ARCH
Represents the CPU processor architecture.
This is the same as the native platforms
.Xr uname 1
.Fl p
@ -488,7 +493,8 @@ It is unfortunate that amd64 specifies the 64-bit evolution of the x86
platform (it matches the 'first rule') as everybody else uses x86_64.
There is no standard name for the processor: each OS selects its own
conventions.
.It Dv MACHINE_CPUARCH Represents the source location for a given
.It Dv MACHINE_CPUARCH
Represents the source location for a given
.Dv MACHINE_ARCH .
It is generally the common prefix for all the MACHINE_ARCH that
share the same implementation, though 'riscv' breaks this rule.
@ -502,25 +508,29 @@ The FreeBSD source base supports amd64 and i386 with two
distinct source bases living in subdirectories named amd64 and i386
(though behind the scenes there's some sharing that fits into this
framework).
.It Dv CPUTYPE Sets the flavor of
.It Dv CPUTYPE
Sets the flavor of
.Dv MACHINE_ARCH
to build.
It is used to optimize the build for a specific CPU / core that the
binaries run on.
Generally, this does not change the ABI, though it can be a fine line
between optimization for specific cases.
.It Dv TARGET Used to set
.It Dv TARGET
Used to set
.Dv MACHINE
in the top level Makefile for cross building.
Unused outside of that scope.
It is not passed down to the rest of the build.
Makefiles outside of the top level should not use it at all (though
some have their own private copy for hysterical raisons).
.It Dv TARGET_ARCH Used to set
.It Dv TARGET_ARCH
Used to set
.Dv MACHINE_ARCH
by the top level Makefile for cross building.
Like
.Dv TARGET , it is unused outside of that scope.
.Dv TARGET ,
it is unused outside of that scope.
.El
.Sh SEE ALSO
.Xr src.conf 5 ,