[libcxx-commits] [libcxxabi] [libc++abi][NFC] Remove some cruft from <__cxxabi_config.h> (PR #164578)

[Nikolas Klauser via libcxx-commits]

https://github.com/philnik777 created https://github.com/llvm/llvm-project/pull/164578

In `<__cxxabi_config.h>` there were a few things still around which aren't ever actually used. This removes some of that cruft.


>From 306ed3ab91211ca6030bbe014561c0648a3a363d Mon Sep 17 00:00:00 2001
From: Nikolas Klauser <nikolasklauser at berlin.de>
Date: Wed, 22 Oct 2025 10:24:23 +0200
Subject: [PATCH] [libc++abi][NFC] Remove some cruft from <__cxxabi_config.h>

---
 libcxxabi/include/__cxxabi_config.h | 24 +-----------------------
 1 file changed, 1 insertion(+), 23 deletions(-)

diff --git a/libcxxabi/include/__cxxabi_config.h b/libcxxabi/include/__cxxabi_config.h
index f5101dbc9e599..e4fd845b1fb35 100644
--- a/libcxxabi/include/__cxxabi_config.h
+++ b/libcxxabi/include/__cxxabi_config.h
@@ -14,10 +14,6 @@
 #define _LIBCXXABI_ARM_EHABI
 #endif
 
-#if !defined(__has_attribute)
-#define __has_attribute(_attribute_) 0
-#endif
-
 #if defined(__clang__)
 #  define _LIBCXXABI_COMPILER_CLANG
 #  ifndef __apple_build_version__
@@ -25,10 +21,6 @@
 #  endif
 #elif defined(__GNUC__)
 #  define _LIBCXXABI_COMPILER_GCC
-#elif defined(_MSC_VER)
-#  define _LIBCXXABI_COMPILER_MSVC
-#elif defined(__IBMCPP__)
-#  define _LIBCXXABI_COMPILER_IBM
 #endif
 
 #if defined(_WIN32)
@@ -66,17 +58,7 @@
  #endif
 #endif
 
-#if defined(_LIBCXXABI_COMPILER_MSVC)
-#define _LIBCXXABI_WEAK
-#else
 #define _LIBCXXABI_WEAK __attribute__((__weak__))
-#endif
-
-#if defined(__clang__)
-#define _LIBCXXABI_COMPILER_CLANG
-#elif defined(__GNUC__)
-#define _LIBCXXABI_COMPILER_GCC
-#endif
 
 #if __has_attribute(__no_sanitize__) && defined(_LIBCXXABI_COMPILER_CLANG)
 #define _LIBCXXABI_NO_CFI __attribute__((__no_sanitize__("cfi")))
@@ -89,11 +71,7 @@
 #  define _LIBCXXABI_GUARD_ABI_ARM
 #endif
 
-#if defined(_LIBCXXABI_COMPILER_CLANG)
-#  if !__has_feature(cxx_exceptions)
-#    define _LIBCXXABI_NO_EXCEPTIONS
-#  endif
-#elif defined(_LIBCXXABI_COMPILER_GCC) && !defined(__EXCEPTIONS)
+#if !defined(__cpp_exceptions) || __cpp_exceptions < 199711L
 #  define _LIBCXXABI_NO_EXCEPTIONS
 #endif