[gcc r11-7195] libstdc++: Fix versioned namespace build

[Jonathan Wakely <redi@gcc.gnu.org>]

https://gcc.gnu.org/g:bc0f7db7ebb649fc4c290cb7327fba5c17d4ed28

commit r11-7195-gbc0f7db7ebb649fc4c290cb7327fba5c17d4ed28
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Feb 11 16:18:19 2021 +0000

    libstdc++: Fix versioned namespace build
    
    The recent changes to define various std::exception_ptr functions inline
    included a change so that the definitions of those functions would be
    omitted for the ABI unstable gnu-versioned-namespace configuration. That
    change was incorrect, because the existing functions that are gated by
    the _GLIBCXX_EH_PTR_COMPAT macro are always needed even for the
    versioned namespace.
    
    This change introduces a new macro to control whether operator== is
    defined as deleted or not, distinct from the existing macro. The new
    macro is not defined for versioned namespace builds, but the old macro
    still is.
    
    libstdc++-v3/ChangeLog:
    
            * libsupc++/eh_ptr.cc (_GLIBCXX_EH_PTR_RELOPS_COMPAT): Define
            new macro.
            * libsupc++/exception_ptr.h (_GLIBCXX_EH_PTR_USED): Check new
            macro instead of _GLIBCXX_EH_PTR_COMPAT.
            (operator==): Likewise.

Diff:
---
 libstdc++-v3/libsupc++/eh_ptr.cc       | 10 +++++++---
 libstdc++-v3/libsupc++/exception_ptr.h |  4 ++--
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/libstdc++-v3/libsupc++/eh_ptr.cc b/libstdc++-v3/libsupc++/eh_ptr.cc
index 5d8ac1d879a..5c4685606fe 100644
--- a/libstdc++-v3/libsupc++/eh_ptr.cc
+++ b/libstdc++-v3/libsupc++/eh_ptr.cc
@@ -25,11 +25,15 @@
 #include <bits/c++config.h>
 #include "eh_atomics.h"
 
-#if ! _GLIBCXX_INLINE_VERSION
 // This macro causes exception_ptr to declare an older API (with corresponding
-// definitions in this file) and to mark some inline functions as "used" so
-// that definitions will be emitted in this translation unit.
+// definitions in this file).
 #define _GLIBCXX_EH_PTR_COMPAT
+
+#if ! _GLIBCXX_INLINE_VERSION
+// This macro causes some inline functions in exception_ptr to be marked
+// as "used" so that definitions will be emitted in this translation unit.
+// We need this because those functions were not inline in previous releases.
+#define _GLIBCXX_EH_PTR_RELOPS_COMPAT
 #endif
 
 #include <exception>
diff --git a/libstdc++-v3/libsupc++/exception_ptr.h b/libstdc++-v3/libsupc++/exception_ptr.h
index 6d41b34fabe..9943668d9b3 100644
--- a/libstdc++-v3/libsupc++/exception_ptr.h
+++ b/libstdc++-v3/libsupc++/exception_ptr.h
@@ -39,7 +39,7 @@
 #include <typeinfo>
 #include <new>
 
-#ifdef _GLIBCXX_EH_PTR_COMPAT
+#ifdef _GLIBCXX_EH_PTR_RELOPS_COMPAT
 # define _GLIBCXX_EH_PTR_USED __attribute__((__used__))
 #else
 # define _GLIBCXX_EH_PTR_USED
@@ -153,7 +153,7 @@ namespace std
 #endif
 
 #if __cpp_impl_three_way_comparison >= 201907L \
-      && ! defined _GLIBCXX_EH_PTR_COMPAT
+      && ! defined _GLIBCXX_EH_PTR_RELOPS_COMPAT
       friend bool
       operator==(const exception_ptr&, const exception_ptr&) noexcept = default;
 #else