Add UseMicrosoftAbi property to switch between gnu/msvc ABIs.

Closes #52.

Author: alexrp

doc/configuration/properties.md

@@ -149,13 +149,12 @@ historical reasons.
 * `SymbolVisibility` (`Default`, `Hidden`): Specifies the symbol visibility in
   C/C++ projects when `__attribute__((visibility(...)))` is not specified.
   `Default` (the default 😉) means public, while `Hidden` means private.
-* `EagerBinding` (`true`, `false`): Enables/disables eager binding of symbols
-  when performing dynamic linking at run time. Eager binding has security
-  benefits, especially in combination with `RelocationHardening`. It is also
-  more reliable if calling external functions from signal handlers. Defaults to
-  `true`.
-* `RelocationHardening` (`true`, `false`): Enables/disables marking relocations
-  as read-only. This has security benefits, especially in combination with
+* `EagerBinding` (`true`, `false`): Enable/disable eager binding of symbols when
+  performing dynamic linking at run time. Eager binding has security benefits,
+  especially in combination with `RelocationHardening`. It is also more reliable
+  if calling external functions from signal handlers. Defaults to `true`.
+* `RelocationHardening` (`true`, `false`): Enable/disable marking relocations as
+  read-only. This has security benefits, especially in combination with
   `EagerBinding`. Defaults to `true`.
 * `Sanitizers`: A semicolon-separated list of
   [sanitizers](https://github.com/google/sanitizers) to instrument code with.
@@ -168,8 +167,13 @@ historical reasons.
   specified in `RuntimeIdentifiers`. Usually specified by the user as e.g.
   `dotnet build -r linux-x64`. Unset by default.
 * `RuntimeIdentifiers`: A semicolon-separated list of runtime identifiers that
-  the project supports. All targets on this list will be cross-compiled as
+  the project supports. All targets in this list will be cross-compiled as
   necessary. Defaults to all targets that the Zig compiler has known-good
   support for.
+* `UseMicrosoftAbi` (`true`, `false`): Enable/disable using the Microsoft ABI
+  when targeting Windows. This may be necessary when linking to static libraries
+  containing C++ code that was compiled for the Microsoft ABI. Note that it is
+  currently not possible to cross-compile from non-Windows platforms when using
+  the Microsoft ABI. Unset by default.
 * `UseEmulator` (`true`, `false`): Enable/disable usage of an appropriate binary
   emulator when cross-compiling. Defaults to `true`.

src/sdk/Sdk/Sdk.props

@@ -8,6 +8,7 @@
 
     <Import Project="Sdk.props"
             Sdk="Microsoft.NET.Sdk" />
+
     <Import Project="../build/Vezel.Zig.Sdk.Core.props" />
     <Import Project="../build/Vezel.Zig.Sdk.Items.props" />
     <Import Project="../build/Vezel.Zig.Sdk.Build.props" />

src/sdk/Sdk/Sdk.targets

@@ -9,8 +9,10 @@
     <Import Project="../build/Vezel.Zig.Sdk.Overrides.targets" />
     <Import Project="../build/Vezel.Zig.Sdk.Cross.targets" />
     <Import Project="../build/Vezel.Zig.Sdk.Symbols.targets" />
+
     <Import Project="Sdk.targets"
             Sdk="Microsoft.NET.Sdk" />
+
     <Import Project="../build/Vezel.Zig.Sdk.Hacks.targets" />
     <Import Project="../build/Vezel.Zig.Sdk.Defaults.targets" />
     <Import Project="../build/Vezel.Zig.Sdk.Defines.targets" />

src/sdk/build/Vezel.Zig.Sdk.Cross.Host.targets

@@ -28,8 +28,9 @@
 
     <PropertyGroup>
         <HostAbi>gnu</HostAbi>
+        <HostAbi Condition="'$(HostSystem)' == 'windows'">msvc</HostAbi>
         <HostAbi Condition="$(HostRuntimeIdentifier.Contains('-musl-'))">musl</HostAbi>
-        <HostAbi Condition="'$(HostArchitecture)' == 'arm'">$(HostAbi)eabihf</HostAbi>
+        <HostAbi Condition="'$(HostArchitecture)' == 'arm' and '$(HostAbi)' != 'msvc'">$(HostAbi)eabihf</HostAbi>
     </PropertyGroup>
 
     <PropertyGroup>

src/sdk/build/Vezel.Zig.Sdk.Cross.Target.targets

@@ -37,8 +37,9 @@
 
     <PropertyGroup>
         <TargetAbi>gnu</TargetAbi>
+        <TargetAbi Condition="'$(TargetSystem)' == 'windows' and '$(UseMicrosoftAbi)' == 'true'">msvc</TargetAbi>
         <TargetAbi Condition="$(TargetRuntimeIdentifier.Contains('-musl-'))">musl</TargetAbi>
-        <TargetAbi Condition="'$(TargetArchitecture)' == 'arm'">$(TargetAbi)eabihf</TargetAbi>
+        <TargetAbi Condition="'$(TargetArchitecture)' == 'arm' and '$(TargetAbi)' != 'msvc'">$(TargetAbi)eabihf</TargetAbi>
     </PropertyGroup>
 
     <PropertyGroup>