[clang] Revert "[Clang] __has_builtin should return false for aux triple builtins (#121839) (PR #124626)

[Nick Sarnie via cfe-commits]

https://github.com/sarnex created https://github.com/llvm/llvm-project/pull/124626

This reverts commit 1c28b9237382b093f477479c993c80181922ca6a.

Breaks CUDA on ARM.

>From 287dcf646d4c7520c8637a798d677168e100b515 Mon Sep 17 00:00:00 2001
From: "Sarnie, Nick" <nick.sarnie at intel.com>
Date: Mon, 27 Jan 2025 13:00:28 -0800
Subject: [PATCH] Revert "[Clang] __has_builtin should return false for aux
 triple builtins (#121839)"

This reverts commit 1c28b9237382b093f477479c993c80181922ca6a.

Breaks CUDA on ARM.
---
 clang/lib/Lex/PPMacroExpansion.cpp           | 10 +++-------
 clang/test/Headers/__cpuidex_conflict.c      |  4 +---
 clang/test/Preprocessor/builtin_aux_info.cpp | 18 ------------------
 3 files changed, 4 insertions(+), 28 deletions(-)
 delete mode 100644 clang/test/Preprocessor/builtin_aux_info.cpp

diff --git a/clang/lib/Lex/PPMacroExpansion.cpp b/clang/lib/Lex/PPMacroExpansion.cpp
index 9cf29668f251fc..347c13da0ad215 100644
--- a/clang/lib/Lex/PPMacroExpansion.cpp
+++ b/clang/lib/Lex/PPMacroExpansion.cpp
@@ -1804,9 +1804,8 @@ void Preprocessor::ExpandBuiltinMacro(Token &Tok) {
                                            diag::err_feature_check_malformed);
         if (!II)
           return false;
-        auto BuiltinID = II->getBuiltinID();
-        if (BuiltinID != 0) {
-          switch (BuiltinID) {
+        else if (II->getBuiltinID() != 0) {
+          switch (II->getBuiltinID()) {
           case Builtin::BI__builtin_cpu_is:
             return getTargetInfo().supportsCpuIs();
           case Builtin::BI__builtin_cpu_init:
@@ -1819,11 +1818,8 @@ void Preprocessor::ExpandBuiltinMacro(Token &Tok) {
             // usual allocation and deallocation functions. Required by libc++
             return 201802;
           default:
-            // __has_builtin should return false for aux builtins.
-            if (getBuiltinInfo().isAuxBuiltinID(BuiltinID))
-              return false;
             return Builtin::evaluateRequiredTargetFeatures(
-                getBuiltinInfo().getRequiredFeatures(BuiltinID),
+                getBuiltinInfo().getRequiredFeatures(II->getBuiltinID()),
                 getTargetInfo().getTargetOpts().FeatureMap);
           }
           return true;
diff --git a/clang/test/Headers/__cpuidex_conflict.c b/clang/test/Headers/__cpuidex_conflict.c
index 0f5e6e5e0a0ff4..8687a6aa2f897a 100644
--- a/clang/test/Headers/__cpuidex_conflict.c
+++ b/clang/test/Headers/__cpuidex_conflict.c
@@ -3,9 +3,7 @@
 // RUN: %clang_cc1 %s -ffreestanding -fms-extensions -fms-compatibility \
 // RUN:  -fms-compatibility-version=19.00 -triple x86_64-pc-windows-msvc -emit-llvm -o -
 // %clang_cc1 %s -ffreestanding -triple x86_64-w64-windows-gnu -fms-extensions -emit-llvm -o -
-//
-// FIXME: See https://github.com/llvm/llvm-project/pull/121839
-// RUN: not %clang_cc1 %s -ffreestanding -fopenmp -fopenmp-is-target-device -aux-triple x86_64-unknown-linux-gnu
+// RUN: %clang_cc1 %s -ffreestanding -fopenmp -fopenmp-is-target-device -aux-triple x86_64-unknown-linux-gnu
 
 typedef __SIZE_TYPE__ size_t;
 
diff --git a/clang/test/Preprocessor/builtin_aux_info.cpp b/clang/test/Preprocessor/builtin_aux_info.cpp
deleted file mode 100644
index 60c8c6c492479a..00000000000000
--- a/clang/test/Preprocessor/builtin_aux_info.cpp
+++ /dev/null
@@ -1,18 +0,0 @@
-// RUN: %clang_cc1 -fopenmp -triple=spirv64 -fopenmp-is-target-device \
-// RUN: -aux-triple x86_64-linux-unknown -E %s | FileCheck -implicit-check-not=BAD %s
-
-// RUN: %clang_cc1 -fopenmp -triple=nvptx64 -fopenmp-is-target-device \
-// RUN: -aux-triple x86_64-linux-unknown -E %s | FileCheck -implicit-check-not=BAD %s
-
-// RUN: %clang_cc1 -fopenmp -triple=amdgcn-amd-amdhsa -fopenmp-is-target-device \
-// RUN: -aux-triple x86_64-linux-unknown -E %s | FileCheck -implicit-check-not=BAD %s
-
-// RUN: %clang_cc1 -fopenmp -triple=aarch64 -fopenmp-is-target-device \
-// RUN: -aux-triple x86_64-linux-unknown -E %s | FileCheck -implicit-check-not=BAD %s
-
-// CHECK: GOOD
-#if __has_builtin(__builtin_ia32_pause)
-  BAD
-#else
-  GOOD
-#endif