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Clang's default C++ dialect is now `gnu++17` instead of `gnu++14`.
CUDA/HIP are unchanged: C++14 from D103221 <https://reviews.llvm.org/D103221>.
Depends on D131464 <https://reviews.llvm.org/D131464>
Close https://github.com/llvm/llvm-project/issues/56946
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D131465
Files:
clang/docs/ReleaseNotes.rst
clang/lib/Basic/LangStandards.cpp
clang/test/Preprocessor/lang-std.cpp
clang/test/Preprocessor/lang-std.cu
Index: clang/test/Preprocessor/lang-std.cu
===================================================================
--- clang/test/Preprocessor/lang-std.cu
+++ /dev/null
@@ -1,7 +0,0 @@
-// RUN: %clang_cc1 -dM -E -x hip %s | FileCheck -check-prefix=CXX14 %s
-// RUN: %clang_cc1 -dM -E %s | FileCheck -check-prefix=CXX14 %s
-// RUN: %clang_cc1 -dM -E -std=c++98 -x hip %s | FileCheck -check-prefix=CXX98
%s
-// RUN: %clang_cc1 -dM -E -std=c++98 %s | FileCheck -check-prefix=CXX98 %s
-
-// CXX98: #define __cplusplus 199711L
-// CXX14: #define __cplusplus 201402L
Index: clang/test/Preprocessor/lang-std.cpp
===================================================================
--- /dev/null
+++ clang/test/Preprocessor/lang-std.cpp
@@ -0,0 +1,11 @@
+/// Test default dialects.
+// RUN: %clang_cc1 -dM -E %s | FileCheck --check-prefix=CXX17 %s
+// RUN: %clang_cc1 -dM -E -x cuda %s | FileCheck --check-prefix=CXX14 %s
+// RUN: %clang_cc1 -dM -E -x hip %s | FileCheck --check-prefix=CXX14 %s
+
+// RUN: %clang_cc1 -dM -E -x cuda -std=c++14 %s | FileCheck
--check-prefix=CXX14 %s
+// RUN: %clang_cc1 -dM -E -x hip -std=c++98 %s | FileCheck
--check-prefix=CXX98 %s
+
+// CXX98: #define __cplusplus 199711L
+// CXX14: #define __cplusplus 201402L
+// CXX17: #define __cplusplus 201703L
Index: clang/lib/Basic/LangStandards.cpp
===================================================================
--- clang/lib/Basic/LangStandards.cpp
+++ clang/lib/Basic/LangStandards.cpp
@@ -78,7 +78,7 @@
if (T.isDriverKit())
return LangStandard::lang_gnucxx17;
else
- return LangStandard::lang_gnucxx14;
+ return LangStandard::lang_gnucxx17;
case Language::RenderScript:
return LangStandard::lang_c99;
case Language::HIP:
Index: clang/docs/ReleaseNotes.rst
===================================================================
--- clang/docs/ReleaseNotes.rst
+++ clang/docs/ReleaseNotes.rst
@@ -120,6 +120,11 @@
C++ Language Changes in Clang
-----------------------------
+* Clang's default C++ dialect is now ``gnu++17`` instead of ``gnu++14``. This
+ means Clang will by default accept code using features from C++17 and
+ conforming GNU extensions. Projects incompatible with C++17 can add
+ ``-std=gnu++14`` to their build settings to restore the previous behaviour.
+
C++20 Feature Support
^^^^^^^^^^^^^^^^^^^^^
Index: clang/test/Preprocessor/lang-std.cu
===================================================================
--- clang/test/Preprocessor/lang-std.cu
+++ /dev/null
@@ -1,7 +0,0 @@
-// RUN: %clang_cc1 -dM -E -x hip %s | FileCheck -check-prefix=CXX14 %s
-// RUN: %clang_cc1 -dM -E %s | FileCheck -check-prefix=CXX14 %s
-// RUN: %clang_cc1 -dM -E -std=c++98 -x hip %s | FileCheck -check-prefix=CXX98 %s
-// RUN: %clang_cc1 -dM -E -std=c++98 %s | FileCheck -check-prefix=CXX98 %s
-
-// CXX98: #define __cplusplus 199711L
-// CXX14: #define __cplusplus 201402L
Index: clang/test/Preprocessor/lang-std.cpp
===================================================================
--- /dev/null
+++ clang/test/Preprocessor/lang-std.cpp
@@ -0,0 +1,11 @@
+/// Test default dialects.
+// RUN: %clang_cc1 -dM -E %s | FileCheck --check-prefix=CXX17 %s
+// RUN: %clang_cc1 -dM -E -x cuda %s | FileCheck --check-prefix=CXX14 %s
+// RUN: %clang_cc1 -dM -E -x hip %s | FileCheck --check-prefix=CXX14 %s
+
+// RUN: %clang_cc1 -dM -E -x cuda -std=c++14 %s | FileCheck --check-prefix=CXX14 %s
+// RUN: %clang_cc1 -dM -E -x hip -std=c++98 %s | FileCheck --check-prefix=CXX98 %s
+
+// CXX98: #define __cplusplus 199711L
+// CXX14: #define __cplusplus 201402L
+// CXX17: #define __cplusplus 201703L
Index: clang/lib/Basic/LangStandards.cpp
===================================================================
--- clang/lib/Basic/LangStandards.cpp
+++ clang/lib/Basic/LangStandards.cpp
@@ -78,7 +78,7 @@
if (T.isDriverKit())
return LangStandard::lang_gnucxx17;
else
- return LangStandard::lang_gnucxx14;
+ return LangStandard::lang_gnucxx17;
case Language::RenderScript:
return LangStandard::lang_c99;
case Language::HIP:
Index: clang/docs/ReleaseNotes.rst
===================================================================
--- clang/docs/ReleaseNotes.rst
+++ clang/docs/ReleaseNotes.rst
@@ -120,6 +120,11 @@
C++ Language Changes in Clang
-----------------------------
+* Clang's default C++ dialect is now ``gnu++17`` instead of ``gnu++14``. This
+ means Clang will by default accept code using features from C++17 and
+ conforming GNU extensions. Projects incompatible with C++17 can add
+ ``-std=gnu++14`` to their build settings to restore the previous behaviour.
+
C++20 Feature Support
^^^^^^^^^^^^^^^^^^^^^
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