[libc++] Remove a few __has_foo defines in __config

[ldionne]

All the compilers we support implement those macros or builtins, so it's not useful to have a fallback to 0 when they're not implemented.

[llvmbot]

@llvm/pr-subscribers-libcxx

Author: Louis Dionne (ldionne)

Changes

All the compilers we support implement those macros or builtins, so it's not useful to have a fallback to 0 when they're not implemented.

---

Full diff: https://github.com/llvm/llvm-project/pull/90511.diff

1 Files Affected:

• (modified) libcxx/include/__config (-24)

diff --git a/libcxx/include/__config b/libcxx/include/__config
index 97cdd020c55d1f..ed55be2eaa76a1 100644
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -334,26 +334,6 @@ _LIBCPP_HARDENING_MODE_DEBUG
 #    define _LIBCPP_CXX03_LANG
 #  endif
 
-#  ifndef __has_attribute
-#    define __has_attribute(__x) 0
-#  endif
-
-#  ifndef __has_builtin
-#    define __has_builtin(__x) 0
-#  endif
-
-#  ifndef __has_extension
-#    define __has_extension(__x) 0
-#  endif
-
-#  ifndef __has_feature
-#    define __has_feature(__x) 0
-#  endif
-
-#  ifndef __has_cpp_attribute
-#    define __has_cpp_attribute(__x) 0
-#  endif
-
 #  ifndef __has_constexpr_builtin
 #    define __has_constexpr_builtin(x) 0
 #  endif
@@ -375,10 +355,6 @@ _LIBCPP_HARDENING_MODE_DEBUG
 
 #  define __has_keyword(__x) !(__is_identifier(__x))
 
-#  ifndef __has_include
-#    define __has_include(...) 0
-#  endif
-
 #  ifndef __has_warning
 #    define __has_warning(...) 0
 #  endif

[philnik777]

LGTM with __has_feature and __has_extension added (until we switch to GCC 14). Maybe add a TODO for that.

[philnik777]

These aren't available in GCC until 14.

[mordante]

LGTM with __has_feature and __has_extension added (until we switch to GCC 14). Maybe add a TODO for that.

FYI GCC 14 is planned for next week. So we might be able to land this review quite soon. (Assuming there are no GCC 14 migration issues.)

LGTM!

[philnik777]

LGTM with __has_feature and __has_extension added (until we switch to GCC 14). Maybe add a TODO for that.

FYI GCC 14 is planned for next week. So we might be able to land this review quite soon. (Assuming there are no GCC 14 migration issues.)

Where did you find that info?

[mordante]

LGTM with __has_feature and __has_extension added (until we switch to GCC 14). Maybe add a TODO for that.

FYI GCC 14 is planned for next week. So we might be able to land this review quite soon. (Assuming there are no GCC 14 migration issues.)

Where did you find that info?

https://gcc.gnu.org/pipermail/gcc/2024-April/243823.html