Remove residual blank line at start of Makefile

This is a residual of the $FreeBSD$ removal.

MFC After: 3 days (though I'll just run the command on the branches)
Sponsored by: Netflix

Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

acpica: Quiet a -Wdangling-pointer warning in AcpiUtInitStackPtrTrace.

This function intentionally saves a pointer to an on-stack variable in
a global as a dubious way of reading the stack pointer.

acpica: Quiet a -Wdangling-pointer warning in AcpiUtInitStackPtrTrace.

This function intentionally saves a pointer to an on-stack variable in
a global as a dubious way of reading the stack pointer.

Reviewed by: imp, emaste
Differential Revision: https://reviews.freebsd.org/D37535

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acpica: Merge ACPICA 20221020

Remove tests for obsolete compilers in the build system

Assume gcc is at least 6.4, the oldest xtoolchain in the ports tree.
Assume clang is at least 6, which was in 11.2-RELEASE. Drop conditions
f

Remove tests for obsolete compilers in the build system

Assume gcc is at least 6.4, the oldest xtoolchain in the ports tree.
Assume clang is at least 6, which was in 11.2-RELEASE. Drop conditions
for older compilers.

Reviewed by: imp (earlier version), emaste, jhb
MFC after: 2 weeks
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D24802

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Merge ^/head r339015 through r339669.

Update ACPICA to 20181003.

Approved by: re (gjb)

Merge ^/head r337646 through r338014.

Merge ACPICA 20180810.

Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
6.0.0 (branches/release_60 r321788). Upstream has branched for the
6.0.0 release, which should be in about 6 weeks. Please re

Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
6.0.0 (branches/release_60 r321788). Upstream has branched for the
6.0.0 release, which should be in about 6 weeks. Please report bugs and
regressions, so we can get them into the release.

Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.

MFC after: 3 months

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Add explanatory comment for r327622: clang 6.0.0 and higher warn about
the ACPI_ROOT_OBJECT and ACPI_TO_POINTER macros from acpica's actypes.h
header, that they use arithmetic on a null pointer treat

Add explanatory comment for r327622: clang 6.0.0 and higher warn about
the ACPI_ROOT_OBJECT and ACPI_TO_POINTER macros from acpica's actypes.h
header, that they use arithmetic on a null pointer treated as a cast
from integer to pointer, which is a GNU extension. We turn off the
warning, because this is in contributed code.

Requested by: rakuco

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Revert r327338, undoing the changes to the ACPI_ADD_PTR and ACPI_SUB_PTR
macros. Instead, turn off clang 6.0.0 warnings about null pointer
arithmetic in usr.sbin/acpi/acpidb instead.

MFH @ r323558.

MFhead@r323343

Merge ACPICA 20170831.

Merge ^/head r321383 through r322397.

MFhead@r321829

MFhead@r321755

Merge ACPICA 20170728.

Merge ^/head r319251 through r319479.

Merge ACPICA 20170531.

Merge ^/head r311460 through r311545.

Merge ACPICA 20161222.

Merge ^/head r306412 through r306905.

Merge ACPICA 20160930.