Build libc++ with C++23

aheejin · aheejin · commit 9cd69bf64596 · 2024-12-21T07:54:02.000Z
https://github.com/llvm/llvm-project/blob/aadaa00de76ed0c4987b97450dd638f63a385bed/libcxx/src/expected.cpp was added in llvm/llvm-project#87390 and this file assumes C++23 to be compiled. Apparently libc++ sources are always built with C++23 so they don't guard things against it in `src/`: llvm/llvm-project#87390 (comment)
diff --git a/tools/system_libs.py b/tools/system_libs.py
@@ -1646,7 +1646,7 @@ class libcxx(NoExceptLibrary, MTLibrary):
     # by `filesystem/directory_iterator.cpp`: https://reviews.llvm.org/D119670
     '-Wno-unqualified-std-cast-call',
     '-Wno-unknown-warning-option',
-    '-std=c++20',
+    '-std=c++23',
   ]
 
   includes = ['system/lib/libcxx/src']

Original file line number	Diff line number	Diff line change
`@@ -1646,7 +1646,7 @@ class libcxx(NoExceptLibrary, MTLibrary):`
`1646`	`1646`	# by `filesystem/directory_iterator.cpp`: https://reviews.llvm.org/D119670
`1647`	`1647`	`'-Wno-unqualified-std-cast-call',`
`1648`	`1648`	`'-Wno-unknown-warning-option',`
`1649`		`- '-std=c++20',`
	`1649`	`+ '-std=c++23',`
`1650`	`1650`	`]`
`1651`	`1651`
`1652`	`1652`	`includes = ['system/lib/libcxx/src']`