Test for C99 stdlib.h functions with -std=c++98

PR libstdc++/69626
	* acinclude.m4 (GLIBCXX_ENABLE_C99): Check C99 stdlib.h functions
	with -std=c++98 and define _GLIBCXX98_USE_C99_STDLIB.
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* testsuite/21_strings/c_strings/char/69626.cc: New.

From-SVN: r233161

libstdc++-v3/ChangeLog

@@ -1,5 +1,12 @@
 2016-02-04  Jonathan Wakely  <jwakely@redhat.com>
 
+	PR libstdc++/69626
+	* acinclude.m4 (GLIBCXX_ENABLE_C99): Check C99 stdlib.h functions
+	with -std=c++98 and define _GLIBCXX98_USE_C99_STDLIB.
+	* config.h.in: Regenerate.
+	* configure: Regenerate.
+	* testsuite/21_strings/c_strings/char/69626.cc: New.
+
 	* doc/html/index.html: Regenerate.
 
 	* doc/xml/manual/containers.xml: Add cross-reference to Dual ABI.

libstdc++-v3/acinclude.m4

@@ -1059,6 +1059,35 @@ AC_DEFUN([GLIBCXX_ENABLE_C99], [
         in <cstdio> in namespace std for C++98.])
     fi
 
+    # Check for the existence in <stdlib.h> of lldiv_t, et. al.
+    AC_MSG_CHECKING([for ISO C99 support in <stdlib.h> for C++98])
+    AC_CACHE_VAL(glibcxx_cv_c99_stdlib_cxx98, [
+      GCC_TRY_COMPILE_OR_LINK(
+        [#include <stdlib.h>
+         volatile float f;
+         volatile long double ld;
+         volatile unsigned long long ll;
+         lldiv_t mydivt;],
+        [char* tmp;
+         f = strtof("gnu", &tmp);
+         ld = strtold("gnu", &tmp);
+         ll = strtoll("gnu", &tmp, 10);
+         ll = strtoull("gnu", &tmp, 10);
+         ll = llabs(10);
+         mydivt = lldiv(10,1);
+         ll = mydivt.quot;
+         ll = mydivt.rem;
+         ll = atoll("10");
+         _Exit(0);
+        ], [glibcxx_cv_c99_stdlib_cxx98=yes], [glibcxx_cv_c99_stdlib_cxx98=no])
+    ])
+    AC_MSG_RESULT($glibcxx_cv_c99_stdlib_cxx98)
+    if test x"$glibcxx_cv_c99_stdlib_cxx98" = x"yes"; then
+      AC_DEFINE(_GLIBCXX98_USE_C99_STDLIB, 1,
+        [Define if C99 functions or macros in <stdlib.h> should be imported
+        in <cstdlib> in namespace std for C++98.])
+    fi
+
     # Check for the existence in <wchar.h> of wcstold, etc.
     if test x"$ac_has_wchar_h" = xyes &&
        test x"$ac_has_wctype_h" = xyes; then

libstdc++-v3/config.h.in

@@ -771,6 +771,10 @@
    <cstdio> in namespace std for C++98. */
 #undef _GLIBCXX98_USE_C99_STDIO
 
+/* Define if C99 functions or macros in <stdlib.h> should be imported in
+   <cstdlib> in namespace std for C++98. */
+#undef _GLIBCXX98_USE_C99_STDLIB
+
 /* Define if C99 functions or macros in <wchar.h> should be imported in
    <cwchar> in namespace std for C++98. */
 #undef _GLIBCXX98_USE_C99_WCHAR

libstdc++-v3/configure

@@ -16970,6 +16970,95 @@ $as_echo "#define _GLIBCXX98_USE_C99_STDIO 1" >>confdefs.h
 
     fi
 
+    # Check for the existence in <stdlib.h> of lldiv_t, et. al.
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for ISO C99 support in <stdlib.h> for C++98" >&5
+$as_echo_n "checking for ISO C99 support in <stdlib.h> for C++98... " >&6; }
+    if test "${glibcxx_cv_c99_stdlib_cxx98+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+
+      if test x$gcc_no_link = xyes; then
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+         volatile float f;
+         volatile long double ld;
+         volatile unsigned long long ll;
+         lldiv_t mydivt;
+int
+main ()
+{
+char* tmp;
+         f = strtof("gnu", &tmp);
+         ld = strtold("gnu", &tmp);
+         ll = strtoll("gnu", &tmp, 10);
+         ll = strtoull("gnu", &tmp, 10);
+         ll = llabs(10);
+         mydivt = lldiv(10,1);
+         ll = mydivt.quot;
+         ll = mydivt.rem;
+         ll = atoll("10");
+         _Exit(0);
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  glibcxx_cv_c99_stdlib_cxx98=yes
+else
+  glibcxx_cv_c99_stdlib_cxx98=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+else
+  if test x$gcc_no_link = xyes; then
+  as_fn_error "Link tests are not allowed after GCC_NO_EXECUTABLES." "$LINENO" 5
+fi
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+         volatile float f;
+         volatile long double ld;
+         volatile unsigned long long ll;
+         lldiv_t mydivt;
+int
+main ()
+{
+char* tmp;
+         f = strtof("gnu", &tmp);
+         ld = strtold("gnu", &tmp);
+         ll = strtoll("gnu", &tmp, 10);
+         ll = strtoull("gnu", &tmp, 10);
+         ll = llabs(10);
+         mydivt = lldiv(10,1);
+         ll = mydivt.quot;
+         ll = mydivt.rem;
+         ll = atoll("10");
+         _Exit(0);
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_link "$LINENO"; then :
+  glibcxx_cv_c99_stdlib_cxx98=yes
+else
+  glibcxx_cv_c99_stdlib_cxx98=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+fi
+
+fi
+
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_c99_stdlib_cxx98" >&5
+$as_echo "$glibcxx_cv_c99_stdlib_cxx98" >&6; }
+    if test x"$glibcxx_cv_c99_stdlib_cxx98" = x"yes"; then
+
+$as_echo "#define _GLIBCXX98_USE_C99_STDLIB 1" >>confdefs.h
+
+    fi
+
     # Check for the existence in <wchar.h> of wcstold, etc.
     if test x"$ac_has_wchar_h" = xyes &&
        test x"$ac_has_wctype_h" = xyes; then

libstdc++-v3/testsuite/21_strings/c_strings/char/69626.cc

@@ -0,0 +1,27 @@
+// Copyright (C) 2016 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++98" }
+// { dg-do compile { target *-*-linux-gnu } }
+
+#include <cstdlib>
+
+long long test01()
+{
+  char* ep;
+  return std::strtoll("0", &ep, 10);
+}