Add target thumbv7a-uwp-windows-msvc

Author: bdbai

src/librustc_codegen_ssa/back/link.rs

@@ -181,6 +181,7 @@ fn get_linker(sess: &Session, linker: &Path, flavor: LinkerFlavor) -> Command {
                     "x86_64" => Some("x64".to_string()),
                     "x86" => Some("x86".to_string()),
                     "aarch64" => Some("arm64".to_string()),
+                    "arm" => Some("arm".to_string()),
                     _ => None,
                 };
                 if let Some(ref a) = arch {

src/librustc_target/spec/mod.rs

@@ -530,6 +530,7 @@ supported_targets! {
     ("i686-uwp-windows-msvc", i686_uwp_windows_msvc),
     ("i586-pc-windows-msvc", i586_pc_windows_msvc),
     ("thumbv7a-pc-windows-msvc", thumbv7a_pc_windows_msvc),
+    ("thumbv7a-uwp-windows-msvc", thumbv7a_uwp_windows_msvc),
 
     ("asmjs-unknown-emscripten", asmjs_unknown_emscripten),
     ("wasm32-unknown-emscripten", wasm32_unknown_emscripten),

src/librustc_target/spec/thumbv7a_uwp_windows_msvc.rs

@@ -0,0 +1,30 @@
+use crate::spec::{LinkerFlavor, PanicStrategy, Target, TargetOptions, TargetResult};
+
+pub fn target() -> TargetResult {
+    let mut base = super::windows_uwp_msvc_base::opts();
+    base.max_atomic_width = Some(64);
+    base.has_elf_tls = true;
+
+    // FIXME(jordanrh): use PanicStrategy::Unwind when SEH is
+    // implemented for windows/arm in LLVM
+    base.panic_strategy = PanicStrategy::Abort;
+
+    Ok(Target {
+        llvm_target: "thumbv7a-pc-windows-msvc".to_string(),
+        target_endian: "little".to_string(),
+        target_pointer_width: "32".to_string(),
+        target_c_int_width: "32".to_string(),
+        data_layout: "e-m:w-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
+        arch: "arm".to_string(),
+        target_os: "windows".to_string(),
+        target_env: "msvc".to_string(),
+        target_vendor: "uwp".to_string(),
+        linker_flavor: LinkerFlavor::Msvc,
+        options: TargetOptions {
+            features: "+vfp3,+neon".to_string(),
+            cpu: "generic".to_string(),
+            abi_blacklist: super::arm_base::abi_blacklist(),
+            ..base
+        },
+    })
+}