[clang] [clang][doc][SYCL] Add SYCL driver and device library release notes to ReleaseNotes.md (PR #211949)

[Srividya Sundaram via cfe-commits]

https://github.com/srividya-sundaram updated https://github.com/llvm/llvm-project/pull/211949

>From db0be28f94cf8cee2a35e5eb8da4442ca703c465 Mon Sep 17 00:00:00 2001
From: srividya sundaram <srividya.sundaram at intel.com>
Date: Fri, 24 Jul 2026 15:30:07 -0700
Subject: [PATCH 1/2] [clang][doc][SYCL] Add SYCL driver and device library
 release notes to ReleaseNotes.md

Ports the SYCL driver entries from PR #200449 (which targeted the now-removed
ReleaseNotes.rst) to ReleaseNotes.md, and adds an entry for compile-time
device library linking via -mlink-builtin-bitcode (#196656).
---
 clang/docs/ReleaseNotes.md | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/clang/docs/ReleaseNotes.md b/clang/docs/ReleaseNotes.md
index 83a2b10d96046..236d6f9db0527 100644
--- a/clang/docs/ReleaseNotes.md
+++ b/clang/docs/ReleaseNotes.md
@@ -493,6 +493,32 @@ features cannot lower the translation-unit ABI level;
 
 #### Improvements
 
+- SYCL compilations now default to `-std=c++17` when no explicit language
+  standard is specified. Standards below C++17 are rejected with a diagnostic.
+
+- Clang now assumes the default target for SYCL device compilation is 64-bit
+  SPIR-V and diagnoses if a non-supporting target is specified on the command
+  line. (#GH167358)
+
+- The SYCL runtime shared library has been renamed from `libsycl.so` to
+  `libLLVMSYCL.so` to align with LLVM naming conventions.
+
+- SYCL header include paths are now added automatically for both host and
+  device compilations.
+
+- SYCL runtime library linking is now supported on Windows. When `-fsycl` is
+  specified, Clang automatically adds `/MD` if no explicit CRT flag is present,
+  links the appropriate debug (`LLVMSYCLd.lib`) or release (`LLVMSYCL.lib`)
+  library, and rejects static CRT flags (`/MT`, `/MTd`) with a diagnostic. Use
+  `-nolibsycl` to suppress automatic library linking.
+
+- Fixed `-nolibsycl` being silently ignored on Linux: the SYCL runtime library
+  was unconditionally added to the link line even when the flag was passed.
+
+- SYCL device compilations targeting SPIR-V now automatically link
+  `libclang_rt.builtins.bc` at compile time via `-mlink-builtin-bitcode`.
+  Pass `--no-offloadlib` to opt out.
+
 ## Additional Information
 
 A wide variety of additional information is available on the [Clang web

>From 5d7225e655b2ce23c85997d14740c2f7f3de79ee Mon Sep 17 00:00:00 2001
From: srividya sundaram <srividya.sundaram at intel.com>
Date: Sun, 26 Jul 2026 20:19:33 -0700
Subject: [PATCH 2/2] Apply review comments.

---
 clang/docs/ReleaseNotes.md | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/clang/docs/ReleaseNotes.md b/clang/docs/ReleaseNotes.md
index 236d6f9db0527..ec11e979084e8 100644
--- a/clang/docs/ReleaseNotes.md
+++ b/clang/docs/ReleaseNotes.md
@@ -503,8 +503,8 @@ features cannot lower the translation-unit ABI level;
 - The SYCL runtime shared library has been renamed from `libsycl.so` to
   `libLLVMSYCL.so` to align with LLVM naming conventions.
 
-- SYCL header include paths are now added automatically for both host and
-  device compilations.
+- In SYCL mode, the compiler driver automatically provides the necessary SYCL
+  header include paths to both the host and device compilers.
 
 - SYCL runtime library linking is now supported on Windows. When `-fsycl` is
   specified, Clang automatically adds `/MD` if no explicit CRT flag is present,
@@ -515,9 +515,8 @@ features cannot lower the translation-unit ABI level;
 - Fixed `-nolibsycl` being silently ignored on Linux: the SYCL runtime library
   was unconditionally added to the link line even when the flag was passed.
 
-- SYCL device compilations targeting SPIR-V now automatically link
-  `libclang_rt.builtins.bc` at compile time via `-mlink-builtin-bitcode`.
-  Pass `--no-offloadlib` to opt out.
+- SYCL device compilations targeting SPIR-V now automatically link compiler
+  builtin functions at compile time. Pass `--no-offloadlib` to opt out.
 
 ## Additional Information