Support TLS access into dylibs on Windows

4 files changed, 8 insertions, 0 deletions

diff --git a/compiler/rustc_target/src/spec/mod.rs b/compiler/rustc_target/src/spec/mod.rs
index 2553b11d878..b53cd2e7df1 100644
--- a/compiler/rustc_target/src/spec/mod.rs
+++ b/compiler/rustc_target/src/spec/mod.rs
@@ -1468,6 +1468,8 @@ pub struct TargetOptions {
     pub features: StaticCow<str>,
     /// Whether dynamic linking is available on this target. Defaults to false.
     pub dynamic_linking: bool,
+    /// Whether dynamic linking can export TLS globals. Defaults to true.
+    pub dll_tls_export: bool,
     /// If dynamic linking is available, whether only cdylibs are supported.
     pub only_cdylib: bool,
     /// Whether executables are available on this target. Defaults to true.
@@ -1859,6 +1861,7 @@ impl Default for TargetOptions {
             cpu: "generic".into(),
             features: "".into(),
             dynamic_linking: false,
+            dll_tls_export: true,
             only_cdylib: false,
             executables: true,
             relocation_model: RelocModel::Pic,
@@ -2530,6 +2533,7 @@ impl Target {
         key!(cpu);
         key!(features);
         key!(dynamic_linking, bool);
+        key!(dll_tls_export, bool);
         key!(only_cdylib, bool);
         key!(executables, bool);
         key!(relocation_model, RelocModel)?;
@@ -2783,6 +2787,7 @@ impl ToJson for Target {
         target_option_val!(cpu);
         target_option_val!(features);
         target_option_val!(dynamic_linking);
+        target_option_val!(dll_tls_export);
         target_option_val!(only_cdylib);
         target_option_val!(executables);
         target_option_val!(relocation_model);
diff --git a/compiler/rustc_target/src/spec/msvc_base.rs b/compiler/rustc_target/src/spec/msvc_base.rs
index 1dad9133ea3..efe949a4e90 100644
--- a/compiler/rustc_target/src/spec/msvc_base.rs
+++ b/compiler/rustc_target/src/spec/msvc_base.rs
@@ -8,6 +8,7 @@ pub fn opts() -> TargetOptions {
 
     TargetOptions {
         linker_flavor: LinkerFlavor::Msvc(Lld::No),
+        dll_tls_export: false,
         is_like_windows: true,
         is_like_msvc: true,
         pre_link_args,
diff --git a/compiler/rustc_target/src/spec/windows_gnu_base.rs b/compiler/rustc_target/src/spec/windows_gnu_base.rs
index a32ca469b2f..2231983f071 100644
--- a/compiler/rustc_target/src/spec/windows_gnu_base.rs
+++ b/compiler/rustc_target/src/spec/windows_gnu_base.rs
@@ -78,6 +78,7 @@ pub fn opts() -> TargetOptions {
         function_sections: false,
         linker: Some("gcc".into()),
         dynamic_linking: true,
+        dll_tls_export: false,
         dll_prefix: "".into(),
         dll_suffix: ".dll".into(),
         exe_suffix: ".exe".into(),
diff --git a/compiler/rustc_target/src/spec/windows_gnullvm_base.rs b/compiler/rustc_target/src/spec/windows_gnullvm_base.rs
index cada28652f9..b1d8e2be5a6 100644
--- a/compiler/rustc_target/src/spec/windows_gnullvm_base.rs
+++ b/compiler/rustc_target/src/spec/windows_gnullvm_base.rs
@@ -23,6 +23,7 @@ pub fn opts() -> TargetOptions {
         abi: "llvm".into(),
         linker: Some("clang".into()),
         dynamic_linking: true,
+        dll_tls_export: false,
         dll_prefix: "".into(),
         dll_suffix: ".dll".into(),
         exe_suffix: ".exe".into(),