[llvm] 08c7673 - [llvm] Enable TLSDESC by default on Fuchsia targets (#124990)

[via llvm-commits]

Author: Paul Kirth
Date: 2025-01-30T10:25:25-08:00
New Revision: 08c76730f35e1dd3c9330b47fc304a35e6d9087e

URL: https://github.com/llvm/llvm-project/commit/08c76730f35e1dd3c9330b47fc304a35e6d9087e
DIFF: https://github.com/llvm/llvm-project/commit/08c76730f35e1dd3c9330b47fc304a35e6d9087e.diff

LOG: [llvm] Enable TLSDESC by default on Fuchsia targets (#124990)

Fuchsia uses TLSDESC by default for all target architectures. We also
make the comment and check for hasDefaultTLSDESC more accurately reflect
its usage.

Added: 
    

Modified: 
    clang/test/Driver/tls-dialect.c
    llvm/include/llvm/TargetParser/Triple.h

Removed: 
    


################################################################################
diff  --git a/clang/test/Driver/tls-dialect.c b/clang/test/Driver/tls-dialect.c
index 3471b55b0ebae94..9ab79e87353d885 100644
--- a/clang/test/Driver/tls-dialect.c
+++ b/clang/test/Driver/tls-dialect.c
@@ -10,6 +10,11 @@
 /// TLSDESC is not on by default in Linux, even on RISC-V, and is covered above
 // RUN: %clang -### --target=riscv64-android %s 2>&1 | FileCheck --check-prefix=DESC %s
 
+/// Fuchsia supports TLSDESC by default for all architectures.
+// RUN: %clang -### --target=riscv64-unknown-fuchsia %s 2>&1 | FileCheck --check-prefix=DESC %s
+// RUN: %clang -### --target=aarch64-unknown-fuchsia %s 2>&1 | FileCheck --check-prefix=DESC %s
+// RUN: %clang -### --target=x86_64-unknown-fuchsia %s 2>&1 | FileCheck --check-prefix=DESC %s
+
 /// LTO
 // RUN: %clang -### --target=loongarch64-linux -flto -mtls-dialect=desc %s 2>&1 | FileCheck --check-prefix=LTO-DESC %s
 // RUN: %clang -### --target=loongarch64-linux -flto %s 2>&1 | FileCheck --check-prefix=LTO-NODESC %s

diff  --git a/llvm/include/llvm/TargetParser/Triple.h b/llvm/include/llvm/TargetParser/Triple.h
index 7d67966d1725639..09c0d223d9b4d3a 100644
--- a/llvm/include/llvm/TargetParser/Triple.h
+++ b/llvm/include/llvm/TargetParser/Triple.h
@@ -1123,9 +1123,10 @@ class Triple {
            isWindowsCygwinEnvironment() || isOHOSFamily();
   }
 
-  /// True if the target supports both general-dynamic and TLSDESC, and TLSDESC
-  /// is enabled by default.
-  bool hasDefaultTLSDESC() const { return isAndroid() && isRISCV64(); }
+  /// True if the target uses TLSDESC by default.
+  bool hasDefaultTLSDESC() const {
+    return isAArch64() || (isAndroid() && isRISCV64()) || isOSFuchsia();
+  }
 
   /// Tests whether the target uses -data-sections as default.
   bool hasDefaultDataSections() const {