Imported from GitHub PR https://github.com/abseil/abseil-cpp/pull/1710

Use the SHELL: prefix in compile flag string to avoid passing it as quoted string
Introduced in CMake 3.12, but as CMake 3.16 is required by this project it will be ok.

According to https://cmake.org/cmake/help/latest/command/target_compile_options.html#option-de-duplication, CMake's target_compile_options ignores duplicate items, like from the quote of the link:

> While beneficial for individual options, the de-duplication step can break up option groups. For example, -option A -option B becomes -option A B. One may specify a group of options using shell-like quoting along with a SHELL: prefix.

This was our problem, -option A -option B should be there, but CMake just made it like -option A B, B was not guarded by -Xarch which led to a compilation error.

I originally tried the fix with quoting the "-option A", but it led to the quoted string passed to the compiler, and therefore ignored.
Now I am using the SHELL: suffix supported by CMake, and it shows differences:

> Current build command with quotes:
> ... -DNOMINMAX "-Xarch_x86_64 -maes" "-Xarch_x86_64 -msse4.1" ... (Wrong)

> With the SHELL: prefix applied:
> ... -DNOMINMAX -Xarch_x86_64 -maes -Xarch_x86_64 -msse4.1 ... (Correct)
Merge 661534618fb62c22336e473aff66a8915f9b4185 into cd7f66ca

Merging this change closes #1710

COPYBARA_INTEGRATE_REVIEW=https://github.com/abseil/abseil-cpp/pull/1710 from Royna2544:master 661534618fb62c22336e473aff66a8915f9b4185
PiperOrigin-RevId: 651433382
Change-Id: I4c626e18ae8b33a8177ea79714b9678f955f469f

Imported from GitHub PR https://github.com/abseil/abseil-cpp/pull/1695

#1495 converted the `if (APPLE)` check for linking against `CoreFoundation` to  generator expressions, which is fine and all.
The issue is that they forgot the other Apple platforms, making builds for iOS impossible.
This patch fixes this issue by adding the other Apple platforms that CMake support to the generator expression.
Merge 4f01df8e09f0dc216006dd7ca2d9ce216122b443 into 6dee1532

Merging this change closes #1695

COPYBARA_INTEGRATE_REVIEW=https://github.com/abseil/abseil-cpp/pull/1695 from GeniusVentures:fix-time-build 4f01df8e09f0dc216006dd7ca2d9ce216122b443
PiperOrigin-RevId: 651416278
Change-Id: I47e4d52384e946cc9e421922f7c6edd5bfa1d976

PiperOrigin-RevId: 651258120
Change-Id: I1c343bc11407d33dc2d0bb1686be4bdbe6a600df

Also, return the middle of the poisoned block.

PiperOrigin-RevId: 651119057
Change-Id: Iae0fc3dcb40e32cd449f469d9b8d62c37f3773f4

PiperOrigin-RevId: 651093644
Change-Id: Ia5bb3343ef06529d5fa2d469bcad47451ea79c69

Imported from GitHub PR https://github.com/abseil/abseil-cpp/pull/1707

Switched to append a full string of "-Xarch_x86_64 -maes" instead of " -Xarch_x86_64" "-maes", for example. Now cmake correctly appends -Xarch_x86_64 to each x64 specific compile option, removing the error caused in recent clang releases:

clang++: error: unsupported option '-msse4.1' for target 'arm64-apple-darwin23.5.0'

Merge 83d17537ee70158d627681a0f0c15f15f30ef838 into f46495ea

Merging this change closes #1707

COPYBARA_INTEGRATE_REVIEW=https://github.com/abseil/abseil-cpp/pull/1707 from Royna2544:patch-1 83d17537ee70158d627681a0f0c15f15f30ef838
PiperOrigin-RevId: 651046496
Change-Id: Ifdb3848febeead4fb562a2d9f0fdca2e0aea185d

Imported from GitHub PR https://github.com/abseil/abseil-cpp/pull/1706

Follow Google OSS policy.
Merge 2ba42b9e5a9ac8c9fe0609fd1ac4cad24714727a into af4c589e

Merging this change closes #1706

COPYBARA_INTEGRATE_REVIEW=https://github.com/abseil/abseil-cpp/pull/1706 from gruenich:feature/cmake-3-16 2ba42b9e5a9ac8c9fe0609fd1ac4cad24714727a
PiperOrigin-RevId: 650646746
Change-Id: Ib600608fbc727161c8b8e69cda9a09637188fef8

https://learn.microsoft.com/en-us/cpp/code-quality/c26816?view=msvc-170

PiperOrigin-RevId: 650044473
Change-Id: I2bf31f1e4b972e890194d21c5a6dcb4ee9993484

This allows them to be used in constant expressions, such as static_asserts.

PiperOrigin-RevId: 649292841
Change-Id: I76e31a94b933fa357276fee534b81c00c28c8b23

PiperOrigin-RevId: 649200175
Change-Id: Ic6741d9fe5e0b1853ed8bb37b585d38b51d15581

PiperOrigin-RevId: 649138261
Change-Id: I8687eb7b06cc9e96779d1d3e98b44b4f643c95a8

PiperOrigin-RevId: 648730502
Change-Id: I662c365c59be9e51f565fd215d284a96b7bd8743

This change makes the mutable overloads of CompressedTuple::get() constexpr.
This is consistent with std::get(std::tuple), which is constexpr since C++14.

PiperOrigin-RevId: 648603141
Change-Id: Icbd61809f7a06723cf581dbed5488b7bae998cc9

This library provides `LookupSymbol` and `LookupSymbolByAddress`. The latter
needs `GetNumSymbols` support. An object file needs either .hash (DT_HASH) or
.gnu.hash (DT_GNU_HASH). This patch adds DT_GNU_HASH support.

Note: glibc has been supporting DT_GNU_HASH since 2006 and .hash has been quite
obsoleted in the Linux communities.
PiperOrigin-RevId: 648459622
Change-Id: I3aa1274cd4617990844258175715e3be2343afd2

This allows them to be used in constexpr expressions, such as the following:

```
constexpr int distance = absl::c_distance(std::array<int, 3>());
```

Requires at least C++17 to be constexpr.

PiperOrigin-RevId: 648435141
Change-Id: I8136e351a6dc4c25f06ef895fb449f4f11048480

PiperOrigin-RevId: 648433954
Change-Id: I32e47a89685419ae8d37dfadb354cfaab2a35ae9

standardized in C++11

Migrate all Abseil code to `[[noreturn]]`. Notably,
https://github.com/abseil/abseil-cpp/issues/1698 reports that
`[[noreturn]]` works better here.

We can't migrate `ABSL_ATTRIBUTE_NORETURN` to use `[[noreturn]]`
because the difference in accepted attribute placement
breaks some code.

PiperOrigin-RevId: 648395324
Change-Id: Icd3e9b837aac25f128e8994de099f1edb3cabccf

This breaks Chromium due to global constructor and incorrectly
assumes page size.
https://github.com/abseil/abseil-cpp/pull/1697

PiperOrigin-RevId: 648377066
Change-Id: I19f8b2655971a0c314091e26e62e10a5a9c46e94

Static cast instead of reinterpret cast raw hash set slots as casting from void* to T* is well defined

PiperOrigin-RevId: 648352837
Change-Id: I082cd0c007706ae8baa8f26cdc85d51b69bffd54

It is not possible to have a constant-initialized object of type
absl::NoDestructor<T>. Fix the documentation so that it doesn't
mention this possibility. Only recommend it use as a function-scope
static variable, and discourage its use as a global variable.
PiperOrigin-RevId: 647488395
Change-Id: Ifee052fce07609d3de72cddc30e86de67706cd91

PiperOrigin-RevId: 647417773
Change-Id: I7d945ae27199262b3baf83b232d17c2f641a27ac

PiperOrigin-RevId: 647359155
Change-Id: I5aba1169b01a74c4431f5ee3788b490124eeaa65

PiperOrigin-RevId: 647340145
Change-Id: I4b0076595dbda1f81ffdc32adad2dc1e35cb9e04

Since we have potential plans to use this function more widely including `absl::c_for_each`, we need to have good error detection.

PiperOrigin-RevId: 647236725
Change-Id: I5035bfb8cef24f80f1bbed83a42380e57d84e428

PiperOrigin-RevId: 647093624
Change-Id: Ic76bfa4aa8fb616cb23095ce7bfa30c3812dcb21

These functions are based on the C++23's `std::ranges::contains()` and `std::ranges::contains_subrange()` functions, see: https://en.cppreference.com/w/cpp/algorithm/ranges/contains

PiperOrigin-RevId: 647084955
Change-Id: If5a01784e3cf1cc4d88e7f2fef92a3701fafc886

This is portable because cord already has `operator<` etc., which will be unaffected. This just allows C++ >= 20 users to explicitly call `operator<=>`.

PiperOrigin-RevId: 646951415
Change-Id: I1432e224bd5dc09b99d56a1d27e95078463adf45

PiperOrigin-RevId: 646949076
Change-Id: I0d3fc57aee38e5b3a5b85e2301f5035bfd0e388b

PiperOrigin-RevId: 646614152
Change-Id: Iee853bdc6f753d758c850a529a6adb05d0d0b1a7

The motivation is to make destroyed/moved-from objects cause crashes when they are accessed.

PiperOrigin-RevId: 646229564
Change-Id: I68d9c189b542df0933af08f5ad63dc1f5764d856

PiperOrigin-RevId: 646172195
Change-Id: I089f1d84f2d73b663f12e6818f96436e054e71ae

windows_clangcl_bazel.bat includes a change from --copt to --cxxopt to
only pass /std:c++XX to C++ compiles

PiperOrigin-RevId: 646157298
Change-Id: Ib6d9861a2b2d45eb0d664f23b6f3a7426f8e0ab3

PiperOrigin-RevId: 646105357
Change-Id: Ia76c1ce33faf811e988d36747f187c112ccb967e

PiperOrigin-RevId: 646031348
Change-Id: I212e34a0b89293bd9f0081047bb5a1eba5d04bcb

`optimization.h` needs to be compatible with C.
`#include <utility>` is C++-only.

PiperOrigin-RevId: 645651894
Change-Id: I55ebc3369b05788346cd0ab684b50bdfc2345fd4

Imported from GitHub PR https://github.com/abseil/abseil-cpp/pull/1692

`optimization.h` uses `std::unreachable()` if available but does not include `<utility>`, causing errors in `absl/strings/ascii.cc`.
Merge bf912bb4e38341d6152ee145ec2be00251c42552 into 8a28a0c8

Merging this change closes #1692

COPYBARA_INTEGRATE_REVIEW=https://github.com/abseil/abseil-cpp/pull/1692 from poconn:optimization_missing_include bf912bb4e38341d6152ee145ec2be00251c42552
PiperOrigin-RevId: 645643983
Change-Id: I3966984afa81f2f6bce65dd872d326f0af114bfa

PiperOrigin-RevId: 645286828
Change-Id: I00efdf1bf774daafbd34c898cf4a524852b638e0

We decided to not allow reentrance in absl::erase_if and absl::container_internal::c_for_each_fast.

PiperOrigin-RevId: 645273965
Change-Id: I75dfc73b93ba10f0e051bf0833723af887e1bb36

This function is aimed to achieve faster iteration through the entire hash table.
It is not ready to be used by the public and stays in `container_internal` namespace.

Differences with `absl::c_for_each`:
1. No guarantees on order of iteration. Although for the hash table it is partially not guaranteed already. But we do not even guarantee that it is the same order as in the for loop range. De facto, the order is the same at the moment.
2. No mutating reentrance is allowed. Most notably erasing from the hash_table is not allowed.

Based on microbenchmarks, there are following conclusions:
1. c_for_each_fast is clearly faster on big tables with 20-60% speedup.
2. Microbenchmarks show regression on a full small table without any empty slots.
   We should avoid recommending that for small tables.
3. It seems reasonable to use `c_for_each_fast` in places, where `skip_empty_or_deleted` has significant GCU usage. `skip_empty_or_deleted` usage signals that there are "gaps" between elements, so `c_for_each_fast` should be an improvement.

PiperOrigin-RevId: 645142512
Change-Id: I279886b8c8b2545504c2bf7e037d27b2545e044d

PiperOrigin-RevId: 645054874
Change-Id: Ic4a820b47edfa71bd3e1f149d54f00ac3c1d16a6