[libcxx-commits] [PATCH] D86055: [libc++] Fix the wrong usage of __STDC_HOSTED__

[hyd-dev via Phabricator via libcxx-commits]

hyd-dev updated this revision to Diff 288919.
hyd-dev edited the summary of this revision.
hyd-dev added a comment.

Add a test (`libcxx/test/libcxx/libcpp_freestanding.sh.cpp`).


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D86055/new/

https://reviews.llvm.org/D86055

Files:
  libcxx/include/__config
  libcxx/test/libcxx/libcpp_freestanding.sh.cpp


Index: libcxx/test/libcxx/libcpp_freestanding.sh.cpp
===================================================================
--- /dev/null
+++ libcxx/test/libcxx/libcpp_freestanding.sh.cpp
@@ -0,0 +1,19 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// Test that _LIBCPP_FREESTANDING is not defined when -ffreestanding is not passed
+// to the compiler but defined when -ffreestanding is passed to the compiler.
+
+// RUN: %{cxx} %{flags} %{compile_flags} -E -dM %s | FileCheck %s
+// RUN: %{cxx} %{flags} %{compile_flags} -E -dM -ffreestanding %s | FileCheck -check-prefix=CHECK-FREESTANDING %s
+
+#include <__config>
+
+// CHECK-NOT: #define _LIBCPP_FREESTANDING
+// CHECK-FREESTANDING: #define _LIBCPP_FREESTANDING
Index: libcxx/include/__config
===================================================================
--- libcxx/include/__config
+++ libcxx/include/__config
@@ -38,10 +38,10 @@
 #  define _LIBCPP_ABI_VERSION 1
 #endif

-#ifndef __STDC_HOSTED__
+#if __STDC_HOSTED__ == 0
 #  define _LIBCPP_FREESTANDING
 #endif

 #ifndef _LIBCPP_STD_VER
 #  if  __cplusplus <= 201103L
 #    define _LIBCPP_STD_VER 11


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