[clang] [llvm] [clang][driver] Set TLSDESC as the default for Android on RISC-V (PR #81198)

[Paul Kirth via cfe-commits]

https://github.com/ilovepi updated https://github.com/llvm/llvm-project/pull/81198

>From 3221a5e60c58e64dabdf23c52d33ba7ed5bdf81e Mon Sep 17 00:00:00 2001
From: Paul Kirth <paulkirth at google.com>
Date: Thu, 8 Feb 2024 14:21:49 -0800
Subject: [PATCH 1/2] =?UTF-8?q?[=F0=9D=98=80=F0=9D=97=BD=F0=9D=97=BF]=20in?=
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Created using spr 1.3.4
---
 llvm/include/llvm/TargetParser/Triple.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/llvm/include/llvm/TargetParser/Triple.h b/llvm/include/llvm/TargetParser/Triple.h
index 98d8490cc9f7a2..0382d97d3fe38b 100644
--- a/llvm/include/llvm/TargetParser/Triple.h
+++ b/llvm/include/llvm/TargetParser/Triple.h
@@ -1036,8 +1036,7 @@ class Triple {
   /// True if the target supports both general-dynamic and TLSDESC, and TLSDESC
   /// is enabled by default.
   bool hasDefaultTLSDESC() const {
-    // TODO: Improve check for other platforms, like Android, and RISC-V
-    return false;
+    return isAndroid() && (!isAndroidVersionLT(29) || isRISCV64());
   }
 
   /// Tests whether the target uses -data-sections as default.

>From 567ccdff99f28cbf9598628e0150458f6302cc28 Mon Sep 17 00:00:00 2001
From: Paul Kirth <paulkirth at google.com>
Date: Thu, 8 Feb 2024 16:15:07 -0800
Subject: [PATCH 2/2] Update test to check for defaults on Android (enabled)
 and Linux (not enabled)

Created using spr 1.3.4
---
 clang/test/Driver/tls-dialect.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/clang/test/Driver/tls-dialect.c b/clang/test/Driver/tls-dialect.c
index 4e105ce3cea5d9..f309f4a44fbc3f 100644
--- a/clang/test/Driver/tls-dialect.c
+++ b/clang/test/Driver/tls-dialect.c
@@ -3,6 +3,11 @@
 // RUN: %clang -### --target=riscv64-linux %s 2>&1 | FileCheck --check-prefix=NODESC %s
 // RUN: %clang -### --target=x86_64-linux -mtls-dialect=gnu %s 2>&1 | FileCheck --check-prefix=NODESC %s
 
+/// Android supports TLSDESC by default after Android version 29 and all RISC-V
+/// TLSDESC is not on by default in Linux, even on RISC-V
+// RUN: %clang -### --target=riscv64-android %s 2>&1 | FileCheck --check-prefix=DESC %s
+// RUN: %clang -### --target=riscv64-linux %s 2>&1 | FileCheck --check-prefix=NODESC %s
+
 /// LTO
 // RUN: %clang -### --target=riscv64-linux -flto -mtls-dialect=desc %s 2>&1 | FileCheck --check-prefix=LTO-DESC %s
 // RUN: %clang -### --target=riscv64-linux -flto %s 2>&1 | FileCheck --check-prefix=LTO-NODESC %s