https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105269
Bug ID: 105269
Summary: missing some library feature test macros in c++20 and
c++23
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: cooky.ykooc922 at gmail dot com
Target Milestone: ---
Given the code:
#include <version>
#ifndef __cpp_lib_constexpr_vector
# warning "__cpp_lib_constexpr_vector is not defined"
#endif
#ifndef __cpp_lib_stdatomic_h
# warning "__cpp_lib_stdatomic_h is not defined"
#endif
#ifdef __cpp_lib_monadic_optional
# warning "__cpp_lib_monadic_optional shouldn't be defined since LWG3621"
# if __cpp_lib_optional != 202110L
# warning "__cpp_lib_optional value should be adjusted to 202110L since
LWG3621"
# endif
#endif
all warnings are emitted:
<source>:4:5: warning: #warning "__cpp_lib_constexpr_vector is not defined"
[-Wcpp]
4 | # warning "__cpp_lib_constexpr_vector is not defined"
| ^~~~~~~
<source>:8:5: warning: #warning "__cpp_lib_stdatomic_h is not defined" [-Wcpp]
8 | # warning "__cpp_lib_stdatomic_h is not defined"
| ^~~~~~~
<source>:12:5: warning: #warning "__cpp_lib_monadic_optional shouldn't be
defined since LWG3621" [-Wcpp]
12 | # warning "__cpp_lib_monadic_optional shouldn't be defined since
LWG3621"
| ^~~~~~~
<source>:14:9: warning: #warning "__cpp_lib_optional value should be adjusted
to 202110L since LWG3621" [-Wcpp]
14 | # warning "__cpp_lib_optional value should be adjusted to 202110L
since LWG3621"
| ^~~~~~~
Compiler returned: 0
godbolt link: https://godbolt.org/z/Y9Wqccnv3
since:
-
https://github.com/gcc-mirror/gcc/commit/1ae8edf5f73ca5c3bf132cc52825dc1f709499dd
is committed to implementing constexpr std::vector (C++20)
-
https://github.com/gcc-mirror/gcc/commit/d7f2a09e98520c4e4927f460ad96803b05a205b1
is committed to implementing <stdatomic.h> (P0943 has __cpp_lib_stdatomic_h
provided) (C++23)
-
https://github.com/gcc-mirror/gcc/commit/82b2e4f8cf5a01c6724fe3f465a77ee03cfcaae2
is commited to implementing monadic operations (before LWG3621 is adopted)
(C++23)
