Auto merge of rust-lang#126913 - ChrisDenton:win-sys, r=<try>

[EXPERIMENT]: Use Windows `sys` bindings and add raw-dylib feature

With recent changes in win32metadata and windows-rs we should no longer need a special `-std` bindings. Additionally, this adds a `windows-raw-dylib` feature that allows users of `build-std` to experiment with using `raw-dylib`. The feature isn't yet complete because there are a few other crates that contribute imports (alloc and backtrace). This PR will currently fail CI's tidy test due to using a git dependency.

cc `@kennykerr,` just to notify you I'm experimenting with this

try-job: x86_64-msvc

r? ghost

Cargo.lock

@@ -6324,8 +6324,7 @@ dependencies = [
 [[package]]
 name = "windows-bindgen"
 version = "0.57.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1ccb96113d6277ba543c0f77e1c5494af8094bf9daf9b85acdc3f1b620e7c7b4"
+source = "git+https://github.com/microsoft/windows-rs.git#863a7cf1d05096c09f2c7cac13ff9f5c9abec61e"
 dependencies = [
  "proc-macro2",
  "rayon",
@@ -6347,8 +6346,7 @@ dependencies = [
 [[package]]
 name = "windows-metadata"
 version = "0.57.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8308d076825b9d9e5abc64f8113e96d02b2aeeba869b20fdd65c7e70cda13dfc"
+source = "git+https://github.com/microsoft/windows-rs.git#863a7cf1d05096c09f2c7cac13ff9f5c9abec61e"
 
 [[package]]
 name = "windows-sys"

library/std/Cargo.toml

@@ -87,6 +87,10 @@ std_detect_file_io = ["std_detect/std_detect_file_io"]
 std_detect_dlsym_getauxval = ["std_detect/std_detect_dlsym_getauxval"]
 std_detect_env_override = ["std_detect/std_detect_env_override"]
 
+# Enable using raw-dylib for Windows imports.
+# This will eventually be the default.
+windows_raw_dylib = []
+
 [package.metadata.fortanix-sgx]
 # Maximum possible number of threads when testing
 threads = 125

library/std/src/sys/pal/windows/c.rs

@@ -13,6 +13,8 @@ use crate::os::raw::{c_char, c_long, c_longlong, c_uint, c_ulong, c_ushort, c_vo
 use crate::os::windows::io::{AsRawHandle, BorrowedHandle};
 use crate::ptr;
 
+mod windows_targets;
+
 mod windows_sys;
 pub use windows_sys::*;
 
@@ -504,7 +506,7 @@ if #[cfg(not(target_vendor = "uwp"))] {
     #[cfg(target_arch = "arm")]
     pub enum CONTEXT {}
 }}
-
+// WSAStartup is only redefined here so that we can override WSADATA for Arm32
 #[link(name = "ws2_32")]
 extern "system" {
     pub fn WSAStartup(wversionrequested: u16, lpwsadata: *mut WSADATA) -> i32;

library/std/src/sys/pal/windows/c/bindings.txt

@@ -1,5 +1,5 @@
 --out windows_sys.rs
---config flatten std
+--config flatten sys
 --filter
 !Windows.Win32.Foundation.INVALID_HANDLE_VALUE
 Windows.Wdk.Storage.FileSystem.FILE_COMPLETE_IF_OPLOCKED