This is not available in Bazel at the moment.

PiperOrigin-RevId: 825562421
Change-Id: Ib77c80eca0f76c4177e5ed7741846e65dacf46f7

Copybara Import from #456

BEGIN_PUBLIC
Support prefer_pic_for_opt_binaries in linux auto-detecting toolchain (#456)

See the demo project [example.zip](https://github.com/user-attachments/files/21706101/example.zip) for reproduction.

Without this fix, `foo.cc` is compiled twice (once PIC, once non-PIC).  With this fix, it is correctly only compiled once because the `.bazelrc` requests `build --features=prefer_pic_for_opt_binaries`.

Closes #456
END_PUBLIC

COPYBARA_INTEGRATE_REVIEW=#456 from jwnimmer-tri:prefer_pic_for_opt_binaries ac8ec34
PiperOrigin-RevId: 825651000
Change-Id: I972d2bc2600268f32296c84412162f2874cc0eaa

Motivation: https://buildkite.com/bazel/rules-swift-swift/builds/6565#019a3382-00de-4df8-a9f7-56e425fab10c

This change exposes `new_objc_provider` to support compatibility with Bazel 6.

In Bazel 7+, `new_objc_provider` is equivalent to `ObjcInfo`.

PiperOrigin-RevId: 826025189
Change-Id: I951f3eb7c1bafab2ff3eec8f0f45e02c499ccf83

* should address the example listed in #17117
* related to #501
* needed to fix pybind/pybind11_bazel#124

Closes #27434.

PiperOrigin-RevId: 826451549
Change-Id: Ib649bb2e38e057a1a4de6b660f41d4dd13192e06

Prerequisite for merging the rest of #25690

PiperOrigin-RevId: 826546324
Change-Id: Ie0a1d60c0db5453815c083c3b7c09ea4ebd94aea

I split the XXL PR bazelbuild/bazel#19940 into several small patches.
This is the fourth patch of Support C++20 Modules, which supports one phase compilation.

## Changes of build graph
First, files are scanned, resulting in the creation of `.ddi` files. If the compiler being used is Clang, the tool `clang-scan-deps` is employed.

Next, the generated `.ddi` files are aggregated into a `.CXXModules.json` file using the `aggregate-ddi` tool.

Following this, the `.CXXModules.json` file, along with the `.ddi` files, is used to generate `.modmap` files through the `generate-modmap` tool.

Finally, the source files are compiled into object files. If a file is a module interface, a corresponding module file is produced as a byproduct.

The following diagram illustrates the scanning process.
```
              ┌────────┐                  ┌────────┐                  ┌────────┐
              │foo.cppm│                  │bar.cppm│                  │main.cc │
              └────┬───┘                  └────┬───┘                  └────┬───┘
                   │  c++-module-deps-scanning │                           │
                   │                           │                           │
              ┌────▼───┐                  ┌────▼───┐                  ┌────▼───┐
              │foo.ddi │                  │bar.ddi │                  │main.ddi│
              └────┬───┘                  └────┬───┘                  └────┬───┘
                   │                           │                           │
                   └───────────────────────────┼───────────────────────────┘
                                               │aggregate-ddi
                                      ┌────────▼───────────┐
                                      │demo.CXXModules.json│
                                      └────────────────────┘
```

The following diagram illustrates the compile process of `foo.cppm`.
```
                                                    ┌────────────────────┐
                                                    │demo.CXXModules.json│
                                                    └─────┬──────────────┘
                                                          │
                                                          │
                                        ┌───────┐         │          ┌───────────┐
                                     ┌─►│foo.ddi├─────────┤          │ bar.cppm  │
                                     │  └───────┘         │          └─────┬─────┘
                                     │                    │                │
                                     │                    │                │
                                     │                    │                │
            c++-module-deps-scanning │                    │                │
      ┌────────┐                     │  ┌───────┐   ┌─────▼────┐      ┌────▼─────┐
      │foo.cppm├─────────────────────┴─►│foo.d  │   │foo.modmap│      │ bar.pcm  │
      └───┬────┘                        └──┬────┘   └────┬─────┘      └────┬─────┘
          │                                │             │                 │
          │                                │             │                 │
          │◄───────────────────────────────┴─────────────┴─────────────────┘
          │ c++20-module-compile
 ┌────────▼─────────┐
 │ foo.pcm && foo.o │
 └──────────────────┘
```

## Changes of compile

I modified the CppCompileAction to include the relevant context, inputs, and outputs.

Context: Module files and `.CXXModules.json` files
Inputs: Module files, `.modmap` file, and `.modmap.input` file
Outputs: Module files and `.CXXModules.json` files
The primary difference in CppCompileAction is the addition of the `computeUsedCpp20Modules` function.

The restart mechanism is utilized; if the necessary C++20 Modules files are not ready during compilation, the current compilation will exit and wait for an appropriate time to recompile.

Closes #22553.

PiperOrigin-RevId: 826606472
Change-Id: I7548ebfbf71a1faaa5d08317429a1e77e2454b54

The merge of C++20 module support in 5c3e987 wasn't covered by tests and requires a number of fixes so that the test case in Bazel's `cc_integration_test` can pass.

Closes #511

COPYBARA_INTEGRATE_REVIEW=#511 from fmeum:c++20-modules 716b9be
PiperOrigin-RevId: 827424640
Change-Id: Iff433f2a9ec0b8ad9585805f7df7a86297731b92

Copybara Import from #513

BEGIN_PUBLIC
Fix bzl_library deps for `//cc/common` (#513)

Broken by b81a4f4

Closes #513
END_PUBLIC

PiperOrigin-RevId: 827898310
Change-Id: I72f929c48cac16911ae23e8ec6d6a9d1f14d51ca

PiperOrigin-RevId: 827920142
Change-Id: Ibfc68d332f13838759e2c8f35f7eb972995f6fec

PiperOrigin-RevId: 827968328
Change-Id: Ibb35c4aa4ae13a01fed8e7419df1b3f7942d8630