ABI versioning macros for libc++.
C++ macros and CMake options that specify the default ABI version of
the library, and can be overridden to pick up new ABI-changing
features.
llvm-svn: 250254
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: a66a7b30ce3624a849867ad39ac62fb8944eb141
diff --git a/include/__config b/include/__config
index a11dbc9..bc01805 100644
--- a/include/__config
+++ b/include/__config
@@ -23,7 +23,13 @@
#define _LIBCPP_VERSION 3800
+#ifndef _LIBCPP_ABI_VERSION
#define _LIBCPP_ABI_VERSION 1
+#endif
+
+#if defined(_LIBCPP_ABI_UNSTABLE) || _LIBCPP_ABI_VERSION >= 2
+#define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
+#endif
#define _LIBCPP_CONCAT1(_LIBCPP_X,_LIBCPP_Y) _LIBCPP_X##_LIBCPP_Y
#define _LIBCPP_CONCAT(_LIBCPP_X,_LIBCPP_Y) _LIBCPP_CONCAT1(_LIBCPP_X,_LIBCPP_Y)
@@ -240,9 +246,12 @@
#if defined(__clang__)
-#if defined(__APPLE__) && !defined(__i386__) && !defined(__x86_64__) && \
- !defined(__arm__)
-#define _LIBCPP_ALTERNATE_STRING_LAYOUT
+// _LIBCPP_ALTERNATE_STRING_LAYOUT is an old name for
+// _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT left here for backward compatibility.
+#if (defined(__APPLE__) && !defined(__i386__) && !defined(__x86_64__) && \
+ !defined(__arm__)) || \
+ defined(_LIBCPP_ALTERNATE_STRING_LAYOUT)
+#define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
#endif
#if __has_feature(cxx_alignas)
diff --git a/include/__config_site.in b/include/__config_site.in
index a248787..7a1d739 100644
--- a/include/__config_site.in
+++ b/include/__config_site.in
@@ -10,6 +10,8 @@
#ifndef _LIBCPP_CONFIG_SITE
#define _LIBCPP_CONFIG_SITE
+#cmakedefine _LIBCPP_ABI_VERSION @_LIBCPP_ABI_VERSION@
+#cmakedefine _LIBCPP_ABI_UNSTABLE
#cmakedefine _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
#cmakedefine _LIBCPP_HAS_NO_STDIN
#cmakedefine _LIBCPP_HAS_NO_STDOUT
diff --git a/include/string b/include/string
index 46c749b..7650b62 100644
--- a/include/string
+++ b/include/string
@@ -1185,7 +1185,7 @@
#pragma warning( pop )
#endif // _LIBCPP_MSVC
-#ifdef _LIBCPP_ALTERNATE_STRING_LAYOUT
+#ifdef _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
template <class _CharT, size_t = sizeof(_CharT)>
struct __padding
@@ -1198,7 +1198,7 @@
{
};
-#endif // _LIBCPP_ALTERNATE_STRING_LAYOUT
+#endif // _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
template<class _CharT, class _Traits, class _Allocator>
class _LIBCPP_TYPE_VIS_ONLY basic_string
@@ -1234,7 +1234,7 @@
private:
-#ifdef _LIBCPP_ALTERNATE_STRING_LAYOUT
+#ifdef _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
struct __long
{
@@ -1294,7 +1294,7 @@
value_type __data_[__min_cap];
};
-#endif // _LIBCPP_ALTERNATE_STRING_LAYOUT
+#endif // _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
union __ulx{__long __lx; __short __lxx;};
@@ -1698,7 +1698,7 @@
const allocator_type& __alloc() const _NOEXCEPT
{return __r_.second();}
-#ifdef _LIBCPP_ALTERNATE_STRING_LAYOUT
+#ifdef _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
_LIBCPP_INLINE_VISIBILITY
void __set_short_size(size_type __s) _NOEXCEPT
@@ -1716,7 +1716,7 @@
{return __r_.first().__s.__size_;}
# endif
-#else // _LIBCPP_ALTERNATE_STRING_LAYOUT
+#else // _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
_LIBCPP_INLINE_VISIBILITY
void __set_short_size(size_type __s) _NOEXCEPT
@@ -1734,7 +1734,7 @@
{return __r_.first().__s.__size_ >> 1;}
# endif
-#endif // _LIBCPP_ALTERNATE_STRING_LAYOUT
+#endif // _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
_LIBCPP_INLINE_VISIBILITY
void __set_long_size(size_type __s) _NOEXCEPT