PR libstdc++/84773 use aligned alloc functions for FreeBSD and MinGW cross-compilers

	PR libstdc++/84773
	PR libstdc++/83662
	* crossconfig.m4: Check for aligned_alloc etc. on freebsd and mingw32.
	* configure: Regenerate.
	* include/c_global/cstdlib [_GLIBCXX_HAVE_ALIGNED_ALLOC]
	(aligned_alloc): Add using-declaration.
	* testsuite/18_support/aligned_alloc/aligned_alloc.cc: New test.

From-SVN: r258468

5 files changed, 86 insertions, 0 deletions

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 7db7e81..743479a 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,13 @@
+2018-03-12  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/84773
+	PR libstdc++/83662
+	* crossconfig.m4: Check for aligned_alloc etc. on freebsd and mingw32.
+	* configure: Regenerate.
+	* include/c_global/cstdlib [_GLIBCXX_HAVE_ALIGNED_ALLOC]
+	(aligned_alloc): Add using-declaration.
+	* testsuite/18_support/aligned_alloc/aligned_alloc.cc: New test.
+
 2018-03-09  François Dumont  <fdumont@gcc.gnu.org>
 
 	* python/libstdcxx/v6/printers.py (build_libstdcxx_dictionary):
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index 54dd7ce..ad6c506 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -53350,6 +53350,19 @@ _ACEOF
 fi
 done
 
+    for ac_func in aligned_alloc posix_memalign memalign _aligned_malloc
+do :
+  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
+ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
+eval as_val=\$$as_ac_var
+   if test "x$as_val" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+done
+
     ;;
 
   *-fuchsia*)
@@ -66100,6 +66113,19 @@ done
 
   CXXFLAGS="$ac_save_CXXFLAGS"
 
+    for ac_func in aligned_alloc posix_memalign memalign _aligned_malloc
+do :
+  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
+ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
+eval as_val=\$$as_ac_var
+   if test "x$as_val" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+done
+
     ;;
   *-netbsd*)
     SECTION_FLAGS='-ffunction-sections -fdata-sections'
diff --git a/libstdc++-v3/crossconfig.m4 b/libstdc++-v3/crossconfig.m4
index a8b1da9..fa56795 100644
--- a/libstdc++-v3/crossconfig.m4
+++ b/libstdc++-v3/crossconfig.m4
@@ -133,6 +133,7 @@ case "${host}" in
       AC_DEFINE(HAVE_ISNANL)
     fi
     AC_CHECK_FUNCS(__cxa_thread_atexit)
+    AC_CHECK_FUNCS(aligned_alloc posix_memalign memalign _aligned_malloc)
     ;;
 
   *-fuchsia*)
@@ -197,6 +198,7 @@ case "${host}" in
     GLIBCXX_CHECK_LINKER_FEATURES
     GLIBCXX_CHECK_MATH_SUPPORT
     GLIBCXX_CHECK_STDLIB_SUPPORT
+    AC_CHECK_FUNCS(aligned_alloc posix_memalign memalign _aligned_malloc)
     ;;
   *-netbsd*)
     SECTION_FLAGS='-ffunction-sections -fdata-sections'
diff --git a/libstdc++-v3/include/c_global/cstdlib b/libstdc++-v3/include/c_global/cstdlib
index a3b19f3..1033501 100644
--- a/libstdc++-v3/include/c_global/cstdlib
+++ b/libstdc++-v3/include/c_global/cstdlib
@@ -78,6 +78,9 @@ namespace std
 
 // Get rid of those macros defined in <stdlib.h> in lieu of real functions.
 #undef abort
+#if __cplusplus >= 201703L && defined(_GLIBCXX_HAVE_ALIGNED_ALLOC)
+# undef aligned_alloc
+#endif
 #undef atexit
 #if __cplusplus >= 201103L
 # ifdef _GLIBCXX_HAVE_AT_QUICK_EXIT
@@ -125,6 +128,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   using ::ldiv_t;
 
   using ::abort;
+#if __cplusplus >= 201703L && defined(_GLIBCXX_HAVE_ALIGNED_ALLOC)
+  using ::aligned_alloc;
+#endif
   using ::atexit;
 #if __cplusplus >= 201103L
 # ifdef _GLIBCXX_HAVE_AT_QUICK_EXIT
diff --git a/libstdc++-v3/testsuite/18_support/aligned_alloc/aligned_alloc.cc b/libstdc++-v3/testsuite/18_support/aligned_alloc/aligned_alloc.cc
new file mode 100644
index 0000000..8af9c72
--- /dev/null
+++ b/libstdc++-v3/testsuite/18_support/aligned_alloc/aligned_alloc.cc
@@ -0,0 +1,42 @@
+// Copyright (C) 2018 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-options "-std=gnu++17" }
+// { dg-do run { target c++17 } }
+
+#include <cstdlib>
+#include <cstdint>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+#ifdef _GLIBCXX_HAVE_ALIGNED_ALLOC
+  void* p = std::aligned_alloc(256, 1);
+  if (p)
+  {
+    VERIFY( (reinterpret_cast<std::uintptr_t>(p) % 256) == 0 );
+    std::free(p);
+  }
+#endif
+}
+
+int
+main()
+{
+  test01();
+}