[gcc r13-5127] libstdc++: Extend max_align_t special case to 64-bit HP-UX [PR77691]

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

https://gcc.gnu.org/g:f629f63d2d9d7ad2c43f8e451f0f6e32b5f4d06a

commit r13-5127-gf629f63d2d9d7ad2c43f8e451f0f6e32b5f4d06a
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Jan 12 10:58:13 2023 +0000

    libstdc++: Extend max_align_t special case to 64-bit HP-UX [PR77691]
    
    GCC's std::max_align_t doesn't agree with the system malloc on HP-UX, so
    generalize the current hack for Solaris to apply to that target too.
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/77691
            * include/experimental/memory_resource
            (_GLIBCXX_MAX_ALIGN_MATCHES_MALLOC): Define.
            (do_allocate, do_deallocate): Check it.
            * testsuite/experimental/memory_resource/new_delete_resource.cc:
            Relax expected behaviour for 64-bit hppa-hp-hpux11.11.

Diff:
---
 libstdc++-v3/include/experimental/memory_resource         | 15 ++++++++++++---
 .../experimental/memory_resource/new_delete_resource.cc   |  4 ++++
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/libstdc++-v3/include/experimental/memory_resource b/libstdc++-v3/include/experimental/memory_resource
index aa86c042d84..786392e8904 100644
--- a/libstdc++-v3/include/experimental/memory_resource
+++ b/libstdc++-v3/include/experimental/memory_resource
@@ -412,11 +412,20 @@ namespace pmr {
       allocator_type get_allocator() const noexcept { return _M_alloc; }
 
     protected:
+#if (defined __sun__ || defined __VXWORKS__) && defined __i386__
+// Cannot use max_align_t on 32-bit Solaris x86, see PR libstdc++/77691
+# define _GLIBCXX_MAX_ALIGN_MATCHES_MALLOC 0
+#elif defined __hpux__ && defined __hppa__ && defined __LP64__
+// Ignore inconsistent long double and malloc alignment (libstdc++/77691)
+# define _GLIBCXX_MAX_ALIGN_MATCHES_MALLOC 0
+#else
+# define _GLIBCXX_MAX_ALIGN_MATCHES_MALLOC 1
+#endif
+
       virtual void*
       do_allocate(size_t __bytes, size_t __alignment) override
       {
-	// Cannot use max_align_t on 32-bit Solaris x86, see PR libstdc++/77691
-#if ! ((defined __sun__ || defined __VXWORKS__) && defined __i386__)
+#if _GLIBCXX_MAX_ALIGN_MATCHES_MALLOC
 	if (__alignment == alignof(max_align_t))
 	  return _M_allocate<alignof(max_align_t)>(__bytes);
 #endif
@@ -442,7 +451,7 @@ namespace pmr {
       do_deallocate(void* __ptr, size_t __bytes, size_t __alignment) noexcept
       override
       {
-#if ! ((defined __sun__ || defined __VXWORKS__) && defined __i386__)
+#if _GLIBCXX_MAX_ALIGN_MATCHES_MALLOC
 	if (__alignment == alignof(max_align_t))
 	  return (void) _M_deallocate<alignof(max_align_t)>(__ptr, __bytes);
 #endif
diff --git a/libstdc++-v3/testsuite/experimental/memory_resource/new_delete_resource.cc b/libstdc++-v3/testsuite/experimental/memory_resource/new_delete_resource.cc
index d121d5f2c41..a7ecb54b905 100644
--- a/libstdc++-v3/testsuite/experimental/memory_resource/new_delete_resource.cc
+++ b/libstdc++-v3/testsuite/experimental/memory_resource/new_delete_resource.cc
@@ -27,6 +27,10 @@
 // See PR libstdc++/77691
 # define BAD_MAX_ALIGN_T 1
 #endif
+#if defined __hpux__ && defined __hppa__ && defined __LP64__
+// Ignore inconsistent long double and malloc alignment (libstdc++/77691)
+# define BAD_MAX_ALIGN_T 1
+#endif
 
 bool new_called = false;
 bool delete_called = false;