[libcxx-commits] [libcxxabi] 3b62506 - [libc++] [libc++abi] Use C++20 standard.

[Marek Kurdej via libcxx-commits]

Author: Marek Kurdej
Date: 2020-11-22T15:57:25+01:00
New Revision: 3b625060fc91598d28196e559196bfc7b9a929f9

URL: https://github.com/llvm/llvm-project/commit/3b625060fc91598d28196e559196bfc7b9a929f9
DIFF: https://github.com/llvm/llvm-project/commit/3b625060fc91598d28196e559196bfc7b9a929f9.diff

LOG: [libc++] [libc++abi] Use C++20 standard.

This change is needed to use char8_t when building libc++.
Using the same standard in libc++abi for coherence.

See https://reviews.llvm.org/D91517.

Reviewed By: ldionne, #libc, #libc_abi

Differential Revision: https://reviews.llvm.org/D91691

Added: 
    

Modified: 
    libcxx/CMakeLists.txt
    libcxxabi/src/CMakeLists.txt

Removed: 
    


################################################################################
diff  --git a/libcxx/CMakeLists.txt b/libcxx/CMakeLists.txt
index dd4c93b59d33..f4c7e9992f71 100644
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -514,11 +514,11 @@ remove_flags(-Wno-pedantic -pedantic-errors -pedantic)
 # Required flags ==============================================================
 function(cxx_add_basic_build_flags target)
 
-  # Require C++17 for all targets. C++17 is needed to use aligned allocation
-  # in the dylib.
+  # Require C++20 for all targets. C++17 is needed to use aligned allocation
+  # in the dylib. C++20 is needed to use char8_t.
   set_target_properties(${target} PROPERTIES
-    CXX_STANDARD 17
-    CXX_STANDARD_REQUIRED YES
+    CXX_STANDARD 20
+    CXX_STANDARD_REQUIRED NO
     CXX_EXTENSIONS NO)
 
   # When building the dylib, don't warn for unavailable aligned allocation

diff  --git a/libcxxabi/src/CMakeLists.txt b/libcxxabi/src/CMakeLists.txt
index 7353c2086b94..a8e12aa36e64 100644
--- a/libcxxabi/src/CMakeLists.txt
+++ b/libcxxabi/src/CMakeLists.txt
@@ -174,9 +174,9 @@ if (LIBCXXABI_ENABLE_SHARED)
                           CXX_EXTENSIONS
                             OFF
                           CXX_STANDARD
-                            17
+                            20
                           CXX_STANDARD_REQUIRED
-                            ON
+                            OFF
                           COMPILE_FLAGS
                             "${LIBCXXABI_COMPILE_FLAGS}"
                           LINK_FLAGS
@@ -241,9 +241,9 @@ if (LIBCXXABI_ENABLE_STATIC)
                           CXX_EXTENSIONS
                             OFF
                           CXX_STANDARD
-                            17
+                            20
                           CXX_STANDARD_REQUIRED
-                            ON
+                            OFF
                           COMPILE_FLAGS
                             "${LIBCXXABI_COMPILE_FLAGS}"
                           LINK_FLAGS