Replace unimplemented! panics with conditional #[link] attribute for WSL/Linux support

The `#[cfg]` structure is verbose and not needed for cross-compilation
(where `target_os = "windows"` anyway).  Furthermore, the
`unimplemented!("Unsupported target OS")` panic prevents using all but
the most basic features windows-rs provides on non-Windows systems.
Use-cases relying on linking external functions include calling `dxcore`
from WSL and `DirectXShaderCompiler` from Linux, both using a COM
interface.

By removing this `#[cfg]` and `unimplemented!()` panic altogether
`windows`, just like `windows-sys`, now unconditionally link using
`-lwindows`.  This allows crates compiling on non-Windows targets to
provide their own fallbacks for needed functions.  Any required but
missing symbol becomes a linker error rather than a runtime panic.

However, such linking may not be desired or complicated to set up, and
doesn't prevent the `tool_*` applications (needed to propagate `bindgen`
changes in this PR to the final codebase, while working from a Linux
environment) through the `metadata` -> `windows-sys` crate from linking
against a `-lwindows` library (and failing).
For this reason a `cfg_attr` with `windows` predicate has been chosen:
`link(name = "windows")` will be enabled on `target_os = "windows"`
exclusively.

The guard is applied to `windows-sys` which previously didn't have any
guarding at all (once again confirming that there's no impact on
cross-compiling) to unblock `tool_*` usage on non-Windows systems.

Users are able to provide fallbacks on their own within their consumer
crate through a simple:

    #[no_mangle]
    pub extern "system" fn SysStringLen(..) -> ...;

for example, without having to resort to compiling that inside a
separate crate that emits a static library or shared object on the
search path.  This is however still possible, though.

There are a few more issues to work out before this crate can _run_ on
Linux and WSL, which have to be fleshed out before we can officially
(build-)test this use-case in CI.

Author: MarijnS95

crates/libs/bindgen/src/functions.rs

@@ -50,7 +50,7 @@ fn gen_win_function(gen: &Gen, def: MethodDef) -> TokenStream {
         Some(link) => quote! { #[link(name = #link, kind = "static")] },
         None => {
             if gen.namespace.starts_with("Windows.") {
-                quote! { #[link(name = "windows")] }
+                quote! { #[cfg_attr(windows, link(name = "windows"))] }
             } else {
                 let impl_map = gen.reader.method_def_impl_map(def).expect("ImplMap not found");
                 let scope = gen.reader.impl_map_scope(impl_map);
@@ -75,17 +75,12 @@ fn gen_win_function(gen: &Gen, def: MethodDef) -> TokenStream {
                 #features
                 #[inline]
                 pub unsafe fn #name<#constraints T: ::windows::core::Interface>(#params) -> ::windows::core::Result<T> {
-                    #[cfg(windows)]
-                    {
-                        #link_attr
-                        extern "system" {
-                            fn #name(#(#abi_params),*) #abi_return_type;
-                        }
-                        let mut result__ = ::core::option::Option::None;
-                        #name(#args).and_some(result__)
+                    #link_attr
+                    extern "system" {
+                        fn #name(#(#abi_params),*) #abi_return_type;
                     }
-                    #[cfg(not(windows))]
-                    unimplemented!("Unsupported target OS");
+                    let mut result__ = ::core::option::Option::None;
+                    #name(#args).and_some(result__)
                 }
             }
         }
@@ -98,16 +93,11 @@ fn gen_win_function(gen: &Gen, def: MethodDef) -> TokenStream {
                 #features
                 #[inline]
                 pub unsafe fn #name<#constraints T: ::windows::core::Interface>(#params result__: *mut ::core::option::Option<T>) -> ::windows::core::Result<()> {
-                    #[cfg(windows)]
-                    {
-                        #link_attr
-                        extern "system" {
-                            fn #name(#(#abi_params),*) #abi_return_type;
-                        }
-                        #name(#args).ok()
+                    #link_attr
+                    extern "system" {
+                        fn #name(#(#abi_params),*) #abi_return_type;
                     }
-                    #[cfg(not(windows))]
-                    unimplemented!("Unsupported target OS");
+                    #name(#args).ok()
                 }
             }
         }
@@ -124,17 +114,12 @@ fn gen_win_function(gen: &Gen, def: MethodDef) -> TokenStream {
                 #features
                 #[inline]
                 pub unsafe fn #name<#constraints>(#params) -> ::windows::core::Result<#return_type_tokens> {
-                    #[cfg(windows)]
-                    {
-                        #link_attr
-                        extern "system" {
-                            fn #name(#(#abi_params),*) #abi_return_type;
-                        }
-                        let mut result__ = ::core::mem::MaybeUninit::<#abi_return_type_tokens>::zeroed();
-                        #name(#args ::core::mem::transmute(result__.as_mut_ptr())).from_abi::<#return_type_tokens>(result__)
+                    #link_attr
+                    extern "system" {
+                        fn #name(#(#abi_params),*) #abi_return_type;
                     }
-                    #[cfg(not(windows))]
-                    unimplemented!("Unsupported target OS");
+                    let mut result__ = ::core::mem::MaybeUninit::<#abi_return_type_tokens>::zeroed();
+                    #name(#args ::core::mem::transmute(result__.as_mut_ptr())).from_abi::<#return_type_tokens>(result__)
                 }
             }
         }
@@ -147,16 +132,11 @@ fn gen_win_function(gen: &Gen, def: MethodDef) -> TokenStream {
                 #features
                 #[inline]
                 pub unsafe fn #name<#constraints>(#params) -> ::windows::core::Result<()> {
-                    #[cfg(windows)]
-                    {
-                        #link_attr
-                        extern "system" {
-                            fn #name(#(#abi_params),*) #abi_return_type;
-                        }
-                        #name(#args).ok()
+                    #link_attr
+                    extern "system" {
+                        fn #name(#(#abi_params),*) #abi_return_type;
                     }
-                    #[cfg(not(windows))]
-                    unimplemented!("Unsupported target OS");
+                    #name(#args).ok()
                 }
             }
         }
@@ -171,17 +151,12 @@ fn gen_win_function(gen: &Gen, def: MethodDef) -> TokenStream {
                     #features
                     #[inline]
                     pub unsafe fn #name<#constraints>(#params) -> ::windows::core::Result<#return_type> {
-                        #[cfg(windows)]
-                        {
-                            #link_attr
-                            extern "system" {
-                                fn #name(#(#abi_params),*) -> #return_type;
-                            }
-                            let result__ = #name(#args);
-                            (!result__.is_invalid()).then(||result__).ok_or_else(::windows::core::Error::from_win32)
+                        #link_attr
+                        extern "system" {
+                            fn #name(#(#abi_params),*) -> #return_type;
                         }
-                        #[cfg(not(windows))]
-                        unimplemented!("Unsupported target OS");
+                        let result__ = #name(#args);
+                        (!result__.is_invalid()).then(||result__).ok_or_else(::windows::core::Error::from_win32)
                     }
                 }
             } else {
@@ -193,16 +168,11 @@ fn gen_win_function(gen: &Gen, def: MethodDef) -> TokenStream {
                     #features
                     #[inline]
                     pub unsafe fn #name<#constraints>(#params) #abi_return_type {
-                        #[cfg(windows)]
-                        {
-                            #link_attr
-                            extern "system" {
-                                fn #name(#(#abi_params),*) #abi_return_type;
-                            }
-                            ::core::mem::transmute(#name(#args))
+                        #link_attr
+                        extern "system" {
+                            fn #name(#(#abi_params),*) #abi_return_type;
                         }
-                        #[cfg(not(windows))]
-                        unimplemented!("Unsupported target OS");
+                        ::core::mem::transmute(#name(#args))
                     }
                 }
             }
@@ -217,16 +187,11 @@ fn gen_win_function(gen: &Gen, def: MethodDef) -> TokenStream {
                 #features
                 #[inline]
                 pub unsafe fn #name<#constraints>(#params) #does_not_return {
-                    #[cfg(windows)]
-                    {
-                        #link_attr
-                        extern "system" {
-                            fn #name(#(#abi_params),*) #does_not_return;
-                        }
-                        #name(#args)
+                    #link_attr
+                    extern "system" {
+                        fn #name(#(#abi_params),*) #does_not_return;
                     }
-                    #[cfg(not(windows))]
-                    unimplemented!("Unsupported target OS");
+                    #name(#args)
                 }
             }
         }

crates/libs/bindgen/src/lib.rs

@@ -80,7 +80,7 @@ pub fn namespace(gen: &Gen, tree: &Tree) -> String {
             if !methods.is_empty() {
                 let methods = methods.values();
                 functions = vec![quote! {
-                    #[link(name = "windows")]
+                    #[cfg_attr(windows, link(name = "windows"))]
                     extern "system" {
                         #(#methods)*
                     }

crates/libs/metadata/Cargo.toml

@@ -12,7 +12,8 @@ default-target = "x86_64-pc-windows-msvc"
 targets = []
 
 [dependencies.windows-sys]
-version = "0.36.1"
+path = "../sys"
+version = "0.38"
 features = [
     "Win32_System_SystemServices",
     "Win32_System_Diagnostics_Debug",

crates/libs/sys/src/Windows/Win32/AI/MachineLearning/DirectML/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_AI_MachineLearning_DirectML\"`, `\"Win32_Graphics_Direct3D12\"`*"]
     #[cfg(feature = "Win32_Graphics_Direct3D12")]

crates/libs/sys/src/Windows/Win32/AI/MachineLearning/WinML/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_AI_MachineLearning_WinML\"`*"]
     pub fn MLCreateOperatorRegistry(registry: *mut IMLOperatorRegistry) -> ::windows_sys::core::HRESULT;

crates/libs/sys/src/Windows/Win32/Data/RightsManagement/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Data_RightsManagement\"`*"]
     pub fn DRMAcquireAdvisories(hlicensestorage: u32, wszlicense: ::windows_sys::core::PCWSTR, wszurl: ::windows_sys::core::PCWSTR, pvcontext: *mut ::core::ffi::c_void) -> ::windows_sys::core::HRESULT;

crates/libs/sys/src/Windows/Win32/Data/Xml/XmlLite/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Data_Xml_XmlLite\"`, `\"Win32_System_Com\"`*"]
     #[cfg(feature = "Win32_System_Com")]

crates/libs/sys/src/Windows/Win32/Devices/AllJoyn/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Devices_AllJoyn\"`, `\"Win32_Foundation\"`*"]
     #[cfg(feature = "Win32_Foundation")]

crates/libs/sys/src/Windows/Win32/Devices/BiometricFramework/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Devices_BiometricFramework\"`*"]
     pub fn WinBioAcquireFocus() -> ::windows_sys::core::HRESULT;

crates/libs/sys/src/Windows/Win32/Devices/Bluetooth/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Devices_Bluetooth\"`, `\"Win32_Foundation\"`*"]
     #[cfg(feature = "Win32_Foundation")]

crates/libs/sys/src/Windows/Win32/Devices/Communication/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Devices_Communication\"`, `\"Win32_Foundation\"`*"]
     #[cfg(feature = "Win32_Foundation")]

crates/libs/sys/src/Windows/Win32/Devices/DeviceAccess/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Devices_DeviceAccess\"`*"]
     pub fn CreateDeviceAccessInstance(deviceinterfacepath: ::windows_sys::core::PCWSTR, desiredaccess: u32, createasync: *mut ICreateDeviceAccessAsync) -> ::windows_sys::core::HRESULT;

crates/libs/sys/src/Windows/Win32/Devices/DeviceAndDriverInstallation/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Devices_DeviceAndDriverInstallation\"`*"]
     pub fn CMP_WaitNoPendingInstallEvents(dwtimeout: u32) -> u32;

crates/libs/sys/src/Windows/Win32/Devices/DeviceQuery/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Devices_DeviceQuery\"`*"]
     pub fn DevCloseObjectQuery(hdevquery: *const HDEVQUERY__);

crates/libs/sys/src/Windows/Win32/Devices/Display/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Devices_Display\"`, `\"Win32_Foundation\"`*"]
     #[cfg(feature = "Win32_Foundation")]

crates/libs/sys/src/Windows/Win32/Devices/Enumeration/Pnp/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Devices_Enumeration_Pnp\"`*"]
     pub fn SwDeviceClose(hswdevice: HSWDEVICE);

crates/libs/sys/src/Windows/Win32/Devices/Fax/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Devices_Fax\"`, `\"Win32_Foundation\"`*"]
     #[cfg(feature = "Win32_Foundation")]

crates/libs/sys/src/Windows/Win32/Devices/HumanInterfaceDevice/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Devices_HumanInterfaceDevice\"`, `\"Win32_Foundation\"`*"]
     #[cfg(feature = "Win32_Foundation")]

crates/libs/sys/src/Windows/Win32/Devices/PortableDevices/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Devices_PortableDevices\"`, `\"Win32_Foundation\"`*"]
     #[cfg(feature = "Win32_Foundation")]

crates/libs/sys/src/Windows/Win32/Devices/Sensors/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Devices_Sensors\"`, `\"Win32_Foundation\"`, `\"Win32_System_Com_StructuredStorage\"`, `\"Win32_UI_Shell_PropertiesSystem\"`*"]
     #[cfg(all(feature = "Win32_Foundation", feature = "Win32_System_Com_StructuredStorage", feature = "Win32_UI_Shell_PropertiesSystem"))]

crates/libs/sys/src/Windows/Win32/Devices/SerialCommunication/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Devices_SerialCommunication\"`*"]
     pub fn ComDBClaimNextFreePort(hcomdb: HCOMDB, comnumber: *mut u32) -> i32;

crates/libs/sys/src/Windows/Win32/Devices/Tapi/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Devices_Tapi\"`, `\"Win32_System_Com\"`*"]
     #[cfg(feature = "Win32_System_Com")]

crates/libs/sys/src/Windows/Win32/Devices/Usb/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Devices_Usb\"`, `\"Win32_Foundation\"`*"]
     #[cfg(feature = "Win32_Foundation")]

crates/libs/sys/src/Windows/Win32/Devices/WebServicesOnDevices/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Devices_WebServicesOnDevices\"`*"]
     pub fn WSDAllocateLinkedMemory(pparent: *mut ::core::ffi::c_void, cbsize: usize) -> *mut ::core::ffi::c_void;

crates/libs/sys/src/Windows/Win32/Foundation/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Foundation\"`*"]
     pub fn CloseHandle(hobject: HANDLE) -> BOOL;

crates/libs/sys/src/Windows/Win32/Gaming/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Gaming\"`, `\"Win32_Foundation\"`*"]
     #[cfg(feature = "Win32_Foundation")]

crates/libs/sys/src/Windows/Win32/Globalization/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Globalization\"`*"]
     pub fn CompareStringA(locale: u32, dwcmpflags: u32, lpstring1: *const i8, cchcount1: i32, lpstring2: *const i8, cchcount2: i32) -> i32;

crates/libs/sys/src/Windows/Win32/Graphics/CompositionSwapchain/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Graphics_CompositionSwapchain\"`*"]
     pub fn CreatePresentationFactory(d3ddevice: ::windows_sys::core::IUnknown, riid: *const ::windows_sys::core::GUID, presentationfactory: *mut *mut ::core::ffi::c_void) -> ::windows_sys::core::HRESULT;

crates/libs/sys/src/Windows/Win32/Graphics/DXCore/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Graphics_DXCore\"`*"]
     pub fn DXCoreCreateAdapterFactory(riid: *const ::windows_sys::core::GUID, ppvfactory: *mut *mut ::core::ffi::c_void) -> ::windows_sys::core::HRESULT;

crates/libs/sys/src/Windows/Win32/Graphics/Direct2D/mod.rs

@@ -1,6 +1,6 @@
 #[cfg(feature = "Win32_Graphics_Direct2D_Common")]
 pub mod Common;
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Graphics_Direct2D\"`, `\"Foundation_Numerics\"`*"]
     #[cfg(feature = "Foundation_Numerics")]

crates/libs/sys/src/Windows/Win32/Graphics/Direct3D/Dxc/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Graphics_Direct3D_Dxc\"`*"]
     pub fn DxcCreateInstance(rclsid: *const ::windows_sys::core::GUID, riid: *const ::windows_sys::core::GUID, ppv: *mut *mut ::core::ffi::c_void) -> ::windows_sys::core::HRESULT;

crates/libs/sys/src/Windows/Win32/Graphics/Direct3D/Fxc/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Graphics_Direct3D_Fxc\"`*"]
     pub fn D3DCompile(psrcdata: *const ::core::ffi::c_void, srcdatasize: usize, psourcename: ::windows_sys::core::PCSTR, pdefines: *const super::D3D_SHADER_MACRO, pinclude: super::ID3DInclude, pentrypoint: ::windows_sys::core::PCSTR, ptarget: ::windows_sys::core::PCSTR, flags1: u32, flags2: u32, ppcode: *mut super::ID3DBlob, pperrormsgs: *mut super::ID3DBlob) -> ::windows_sys::core::HRESULT;

crates/libs/sys/src/Windows/Win32/Graphics/Direct3D10/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Graphics_Direct3D10\"`, `\"Win32_Graphics_Direct3D\"`*"]
     #[cfg(feature = "Win32_Graphics_Direct3D")]

crates/libs/sys/src/Windows/Win32/Graphics/Direct3D11/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Graphics_Direct3D11\"`, `\"Win32_Foundation\"`, `\"Win32_Graphics_Direct3D\"`, `\"Win32_Graphics_Dxgi\"`*"]
     #[cfg(all(feature = "Win32_Foundation", feature = "Win32_Graphics_Direct3D", feature = "Win32_Graphics_Dxgi"))]

crates/libs/sys/src/Windows/Win32/Graphics/Direct3D11on12/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Graphics_Direct3D11on12\"`, `\"Win32_Graphics_Direct3D\"`, `\"Win32_Graphics_Direct3D11\"`*"]
     #[cfg(all(feature = "Win32_Graphics_Direct3D", feature = "Win32_Graphics_Direct3D11"))]

crates/libs/sys/src/Windows/Win32/Graphics/Direct3D12/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Graphics_Direct3D12\"`, `\"Win32_Graphics_Direct3D\"`*"]
     #[cfg(feature = "Win32_Graphics_Direct3D")]

crates/libs/sys/src/Windows/Win32/Graphics/Direct3D9/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Graphics_Direct3D9\"`*"]
     pub fn D3DPERF_BeginEvent(col: u32, wszname: ::windows_sys::core::PCWSTR) -> i32;

crates/libs/sys/src/Windows/Win32/Graphics/Direct3D9on12/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Graphics_Direct3D9on12\"`, `\"Win32_Foundation\"`, `\"Win32_Graphics_Direct3D9\"`*"]
     #[cfg(all(feature = "Win32_Foundation", feature = "Win32_Graphics_Direct3D9"))]

crates/libs/sys/src/Windows/Win32/Graphics/DirectComposition/mod.rs

@@ -1,4 +1,4 @@
-#[link(name = "windows")]
+#[cfg_attr(windows, link(name = "windows"))]
 extern "system" {
     #[doc = "*Required features: `\"Win32_Graphics_DirectComposition\"`, `\"Win32_Foundation\"`*"]
     #[cfg(feature = "Win32_Foundation")]