On 5/15/23 11:24, Patrick Palka wrote:
This adds the feature-test macro for PR0849R8, as per
https://github.com/cplusplus/CWG/issues/281.
Tested on x86_64-pc-linux-gnu, does this look OK for trunk/13?
OK.
gcc/c-family/ChangeLog:
* c-cppbuiltin.cc (c_cpp_builtins): Predefine __cpp_auto_cast
for C++23.
gcc/testsuite/ChangeLog:
* g++.dg/cpp23/feat-cxx2b.C: Test __cpp_auto_cast.
---
gcc/c-family/c-cppbuiltin.cc | 1 +
gcc/testsuite/g++.dg/cpp23/feat-cxx2b.C | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/gcc/c-family/c-cppbuiltin.cc b/gcc/c-family/c-cppbuiltin.cc
index 98f5aef2af9..5d64625fcd7 100644
--- a/gcc/c-family/c-cppbuiltin.cc
+++ b/gcc/c-family/c-cppbuiltin.cc
@@ -1074,6 +1074,7 @@ c_cpp_builtins (cpp_reader *pfile)
/* Set feature test macros for C++23. */
cpp_define (pfile, "__cpp_size_t_suffix=202011L");
cpp_define (pfile, "__cpp_if_consteval=202106L");
+ cpp_define (pfile, "__cpp_auto_cast=202110L");
cpp_define (pfile, "__cpp_constexpr=202211L");
cpp_define (pfile, "__cpp_multidimensional_subscript=202211L");
cpp_define (pfile, "__cpp_named_character_escapes=202207L");
diff --git a/gcc/testsuite/g++.dg/cpp23/feat-cxx2b.C
b/gcc/testsuite/g++.dg/cpp23/feat-cxx2b.C
index 6f4f6bcaad0..9e29b01adc1 100644
--- a/gcc/testsuite/g++.dg/cpp23/feat-cxx2b.C
+++ b/gcc/testsuite/g++.dg/cpp23/feat-cxx2b.C
@@ -578,6 +578,12 @@
# error "__cpp_implicit_move != 202207"
#endif
+#ifndef __cpp_auto_cast
+# error "__cpp_auto_cast"
+#elif __cpp_auto_cast != 202110
+# error "__cpp_auto_cast != 202110"
+#endif
+
// C++23 attributes:
#ifdef __has_cpp_attribute
