Fix buildworld with gcc 12 after llvm-19 import

Unfortunately gcc 12's is not yet capable of compiling all of libc++
19's C++23 code, which results in errors similar to:

/usr/src/freebsd/src/cont

Fix buildworld with gcc 12 after llvm-19 import

Unfortunately gcc 12's is not yet capable of compiling all of libc++
19's C++23 code, which results in errors similar to:

/usr/src/freebsd/src/contrib/llvm-project/libcxx/include/__algorithm/ranges_contains.h:41:3: error: 'static constexpr bool std::__1::ranges::__contains::__fn::operator()(_Iter, _Sent, const _Type&, _Proj)' must be a non-static member function
41 | operator()(_Iter __first, _Sent __last, const _Type& __value, _Proj __proj = {}) {
| ^~~~~~~~
/usr/src/freebsd/src/contrib/llvm-project/libcxx/include/__algorithm/ranges_contains.h:48:3: error: 'static constexpr bool std::__1::ranges::__contains::__fn::operator()(_Range&&, const _Type&, _Proj)' must be a non-static member function
48 | operator()(_Range&& __range, const _Type& __value, _Proj __proj = {}) {
| ^~~~~~~~

Until we can get rid of gcc 12, work around this by making it compile
libc++ in C++20 mode instead.

NOTE: The resulting libc++ library will not be C++23 compatible! Please
try to avoid shipping it, and use gcc 13 instead, if you must use gcc.

PR: 280562
MFC after: 3 days

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libcxx-compat: install headers that were reintroduced by reverts

PR: 280562
MFC after: 1 month

Merge llvm-project release/19.x llvmorg-19.1.0-rc1-0-ga4902a36d5c2

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/19.x llvmorg-19.1.0-rc1-0-ga

Merge llvm-project release/19.x llvmorg-19.1.0-rc1-0-ga4902a36d5c2

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/19.x llvmorg-19.1.0-rc1-0-ga4902a36d5c2.

PR: 280562
MFC after: 1 month

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Merge llvm-project main llvmorg-19-init-18630-gf2ccf80136a0

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-19-init-18630-gf2ccf80136a0, t

Merge llvm-project main llvmorg-19-init-18630-gf2ccf80136a0

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-19-init-18630-gf2ccf80136a0, the
last commit before the upstream release/19.x branch was created.

PR: 280562
MFC after: 1 month

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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

Merge llvm-project main llvmorg-18-init-18359-g93248729cfae

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-18-init-18359-g93248729cfae, t

Merge llvm-project main llvmorg-18-init-18359-g93248729cfae

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-18-init-18359-g93248729cfae, the
last commit before the upstream release/18.x branch was created.

PR: 276104
MFC after: 1 month

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Merge llvm-project main llvmorg-18-init-16864-g3b3ee1f53424

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-18-init-16864-g3b3ee1f53424.

Merge llvm-project main llvmorg-18-init-16864-g3b3ee1f53424

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-18-init-16864-g3b3ee1f53424.

PR: 276104
MFC after: 1 month

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Merge llvm-project main llvmorg-18-init-15692-g007ed0dccd6a

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-18-init-15692-g007ed0dccd6a.

Merge llvm-project main llvmorg-18-init-15692-g007ed0dccd6a

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-18-init-15692-g007ed0dccd6a.

PR: 276104
MFC after: 1 month

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Merge llvm-project main llvmorg-18-init-15088-gd14ee76181fb

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-18-init-15088-gd14ee76181fb.

Merge llvm-project main llvmorg-18-init-15088-gd14ee76181fb

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-18-init-15088-gd14ee76181fb.

PR: 276104
MFC after: 1 month

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Add missing /usr/include/c++/v1/__mdspan/mdspan.h header

I missed this header while updating the Makefile for libc++ 17.

PR: 273753
MFC after: 1 month

Merge llvm-project main llvmorg-17-init-19304-gd0b54bb50e51

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-17-init-19304-gd0b54bb50e51, t

Merge llvm-project main llvmorg-17-init-19304-gd0b54bb50e51

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-17-init-19304-gd0b54bb50e51, the
last commit before the upstream release/17.x branch was created.

PR: 273753
MFC after: 1 month

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Remove $FreeBSD$: one-line sh pattern

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

Merge llvm-project main llvmorg-16-init-18548-gb0daacf58f41

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-16-init-18548-gb0daacf58f41.

PR: 271047
MFC af

Merge llvm-project main llvmorg-16-init-18548-gb0daacf58f41

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-16-init-18548-gb0daacf58f41.

PR: 271047
MFC after: 1 month

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Merge llvm-project release/15.x llvmorg-15.0.0-rc2-40-gfbd2950d8d0d

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-15.0.0-rc2-40-gfbd2950d8d0d.

PR: 26542

Merge llvm-project release/15.x llvmorg-15.0.0-rc2-40-gfbd2950d8d0d

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-15.0.0-rc2-40-gfbd2950d8d0d.

PR: 265425
MFC after: 2 weeks

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Merge llvm-project main llvmorg-15-init-17826-g1f8ae9d7e7e4

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-15-init-17826-g1f8ae9d7e7e4, the last commit bef

Merge llvm-project main llvmorg-15-init-17826-g1f8ae9d7e7e4

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-15-init-17826-g1f8ae9d7e7e4, the last commit before
the upstream release/16.x branch was created.

PR: 265425
MFC after: 2 weeks

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Merge llvm-project main llvmorg-15-init-17485-ga3e38b4a206b

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-15-init-17485-ga3e38b4a206b.

PR: 265425
MFC af

Merge llvm-project main llvmorg-15-init-17485-ga3e38b4a206b

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-15-init-17485-ga3e38b4a206b.

PR: 265425
MFC after: 2 weeks

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Merge llvm-project main llvmorg-15-init-16436-g18a6ab5b8d1f

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-15-init-16436-g18a6ab5b8d1f.

PR: 265425
MFC af

Merge llvm-project main llvmorg-15-init-16436-g18a6ab5b8d1f

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-15-init-16436-g18a6ab5b8d1f.

PR: 265425
MFC after: 2 weeks

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Merge llvm-project main llvmorg-15-init-15358-g53dc0f10787

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-15-init-15358-g53dc0f10787.

PR: 265425
MFC afte

Merge llvm-project main llvmorg-15-init-15358-g53dc0f10787

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-15-init-15358-g53dc0f10787.

PR: 265425
MFC after: 2 weeks

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Apply libc++ fix for <ranges> not compiling at all

Merge commit 44cdca37c01a from llvm git (by Arthur O'Dwyer):

[libc++] Define `namespace views` in its own detail header.

Discovered in the co

Apply libc++ fix for <ranges> not compiling at all

Merge commit 44cdca37c01a from llvm git (by Arthur O'Dwyer):

[libc++] Define `namespace views` in its own detail header.

Discovered in the comments on D118748: we would like this namespace
to exist anytime Ranges exists, regardless of whether concepts syntax
is supported. Also, we'd like to fully granularize the <ranges> header,
which means not putting any loose declarations at the top level.

Differential Revision: https://reviews.llvm.org/D118809

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Merge llvm-project main llvmorg-14-init-18294-gdb01b123d012

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-14-init-18294-gdb01b123d012, the last commit bef

Merge llvm-project main llvmorg-14-init-18294-gdb01b123d012

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-14-init-18294-gdb01b123d012, the last commit before
the upstream release/14.x branch was created.

PR: 261742
MFC after: 2 weeks

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Merge llvm-project main llvmorg-14-init-17616-g024a1fab5c35

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-14-init-17616-g024a1fab5c35.

PR: 261742
MFC af

Merge llvm-project main llvmorg-14-init-17616-g024a1fab5c35

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-14-init-17616-g024a1fab5c35.

PR: 261742
MFC after: 2 weeks

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Merge llvm-project main llvmorg-14-init-11187-g222442ec2d71

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-14-init-11187-g222442ec2d71.

PR: 261742
MFC af

Merge llvm-project main llvmorg-14-init-11187-g222442ec2d71

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-14-init-11187-g222442ec2d71.

PR: 261742
MFC after: 2 weeks

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Merge llvm-project main llvmorg-14-init-10223-g401b76fdf2b3

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-14-init-10223-g401b76fdf2b3.

PR: 261742
MFC af

Merge llvm-project main llvmorg-14-init-10223-g401b76fdf2b3

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-14-init-10223-g401b76fdf2b3.

PR: 261742
MFC after: 2 weeks

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Install unwind.h into /usr/include

Install headers from LLVM's libunwind in place of the headers from
libcxxrt and allow C applications to use the library.

As part of this, remove include/unwind.h

Install unwind.h into /usr/include

Install headers from LLVM's libunwind in place of the headers from
libcxxrt and allow C applications to use the library.

As part of this, remove include/unwind.h and switch libthr over to
using the installed unwind.h.

Reviewed by: dim, emaste
MFC after: 10 days
Differential Revision: https://reviews.freebsd.org/D34065

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Reapply: move libc++ from /usr/lib to /lib

As with other runtime components like libc or libcxxrt.

If desired we can stop linking devd statically after this change (to
achive approximately no net c

Reapply: move libc++ from /usr/lib to /lib

As with other runtime components like libc or libcxxrt.

If desired we can stop linking devd statically after this change (to
achive approximately no net change in required root filesystem size).

We must set SHLIBDIR with ?= before including <src.opts.mk>, otherwise
that will have set SHBLIDIR to its default value of /usr/lib.

Otherwise, "make delete-old-libs" would suggest to delete libc++.so.1
from /usr/lib, while there was not yet a copy in /lib.

Reviewed by: imp
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D33123

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