src/lib/libc++, branch main

Revert 00bee6fcd77f, which partially reverted libc++ commit aa7f377c965c

2026-05-01T18:16:18+00:00

After base 966fb94cb357, this revert is no longer necessary: stdint.h
will unconditionally define macros such as `SIZE_MAX`, `UINT64_C`, and
others.

Submitted by:   Nikolas Klauser 
MFC after:      1 month
Reviewed by:    imp
Differential Revision: https://reviews.freebsd.org/D56746

Partially revert libc++ commit aa7f377c965c, restoring stdint.h

2026-04-25T14:14:11+00:00

This partially reverts upstream libc++ commit aa7f377c965c:

  [libc++] Remove libc++'s own stdint.h and locale.h (#107436)

  These headers are not doing anything beyond the system or compiler
  provided equivalent headers, so there's no real reason to keep them
  around. Reducing the number of C headers we provide in libc++ simplifies
  our header layering and reduces the potential for confusion when headers
  are layered incorrectly.

The problem is that libc++'s own `stdint.h` _does_ do something: it
defines `__STDC_LIMIT_MACROS` and `__STDC_CONSTANT_MACROS` before
including the system `stdint.h`, causing the latter to expose macros
like `SIZE_MAX`, `UINT64_C`, and others.

If the `__STDC_LIMIT_MACROS` and `__STDC_CONSTANT_MACROS` macros are not
exposed, C++ programs compiled for standards before C++11 can fail with
errors due to those macros not being available.

PR:		292067
MFC after:	1 month

Merge llvm-project release/21.x llvmorg-21.1.7-0-gcd708029e0b2

2026-04-25T14:14:02+00:00

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/21.x llvmorg-21.1.7-0-gcd708029e0b2,
a.k.a. 21.1.7 release.

PR:		292067
MFC after:	1 month

Fixups after llvm-project main llvmorg-21-init-19288-gface93e724f4 merge

2026-04-25T14:11:52+00:00

Fix various configuration fails, update generated headers, Makefiles, etc.

PR:		292067
MFC after:	1 month

Revert "libcxx-compat: install headers that were reintroduced by reverts"

2026-04-25T14:07:40+00:00

This reverts commit 8ad38d5eb3985ef778a7d36093878b0b373ccedf, in
preparation for merging llvm 21.

PR:		292067
MFC after:	1 month

Revert "libcxx-compat: update libcxx.imp for headers that were reintroduced by reverts"

2026-04-25T14:07:40+00:00

This reverts commit caf0ccccc304e3e7938c9722f1deb0a362fd70d5, in
preparation for merging llvm 21.

PR:		292067
MFC after:	1 month

Merge llvm-project release/19.x llvmorg-19.1.3-0-gab51eccf88f5

2024-11-08T16:45:31+00:00

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/19.x llvmorg-19.1.3-0-gab51eccf88f5,
a.k.a. 19.1.3 release.

PR:		280562
MFC after:	1 month

Fix buildworld with gcc 12 after llvm-19 import

2024-10-25T16:08:32+00:00

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

libcxx-compat: update libcxx.imp for headers that were reintroduced by reverts

2024-10-23T18:26:50+00:00

PR:		280562
MFC after:	1 month

libcxx-compat: install headers that were reintroduced by reverts

2024-10-23T18:26:49+00:00

PR:		280562
MFC after:	1 month