1 files changed, 79 insertions, 0 deletions
diff --git a/m4/cxx-std-funcs.m4 b/m4/cxx-std-funcs.m4
new file mode 100644
index 0000000000000..d2266b4d5bc0c
--- /dev/null
+++ b/m4/cxx-std-funcs.m4
@@ -0,0 +1,79 @@
+dnl
+dnl Automated Testing Framework (atf)
+dnl
+dnl Copyright (c) 2007 The NetBSD Foundation, Inc.
+dnl All rights reserved.
+dnl
+dnl Redistribution and use in source and binary forms, with or without
+dnl modification, are permitted provided that the following conditions
+dnl are met:
+dnl 1. Redistributions of source code must retain the above copyright
+dnl    notice, this list of conditions and the following disclaimer.
+dnl 2. Redistributions in binary form must reproduce the above copyright
+dnl    notice, this list of conditions and the following disclaimer in the
+dnl    documentation and/or other materials provided with the distribution.
+dnl
+dnl THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
+dnl CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+dnl INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+dnl MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+dnl IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
+dnl DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+dnl DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+dnl GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+dnl INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+dnl IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+dnl OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+dnl IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+dnl
+
+AC_DEFUN([ATF_CHECK_IN_STD], [
+    AC_MSG_CHECKING(whether $1 is in std)
+    AC_COMPILE_IFELSE(
+        [AC_LANG_PROGRAM([$2], [$3 return 0;])],
+        AC_MSG_RESULT(yes)
+        AC_DEFINE([HAVE_]translit($1, [a-z], [A-Z])[_IN_STD], [1],
+                  [Define to 1 if $1 is in std]),
+        AC_MSG_RESULT(no)
+    )
+])
+
+AC_DEFUN([ATF_CHECK_STD_PUTENV], [
+    ATF_CHECK_IN_STD([putenv],
+                     [#include <cstdio>],
+                     [std::putenv("a=b");]
+                    )
+])
+
+AC_DEFUN([ATF_CHECK_STD_SETENV], [
+    ATF_CHECK_IN_STD([setenv],
+                     [#include <cstdio>],
+                     [std::setenv("a", "b");]
+                    )
+])
+
+AC_DEFUN([ATF_CHECK_STD_SNPRINTF], [
+    ATF_CHECK_IN_STD([snprintf],
+                     [#include <cstdio>],
+                     [char buf;
+                      std::snprintf(&buf, 1, "");]
+                    )
+])
+
+AC_DEFUN([ATF_CHECK_STD_UNSETENV], [
+    ATF_CHECK_IN_STD([unsetenv],
+                     [#include <cstdio>],
+                     [std::unsetenv("a");]
+                    )
+])
+
+AC_DEFUN([ATF_CHECK_STD_VSNPRINTF], [
+    ATF_CHECK_IN_STD([vsnprintf],
+                     [#include <cstdarg>
+                      #include <cstdio>],
+                     [va_list ap;
+                      char* buf = NULL;
+                      const char* fmt = NULL;
+                      std::vsnprintf(buf, 0, fmt, ap);]
+                    )
+])