Final 2.9 tag with updated docs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/tags/RELEASE_29@129056 91177308-0d34-0410-b5e6-96231b3b80d8

final/autoconf/m4/single_cxx_check.m4

@@ -0,0 +1,10 @@
+dnl AC_SINGLE_CXX_CHECK(CACHEVAR, FUNCTION, HEADER, PROGRAM)
+dnl                     $1,       $2,       $3,     $4,     
+dnl 
+AC_DEFUN([AC_SINGLE_CXX_CHECK],
+ [AC_CACHE_CHECK([for $2 in $3], [$1],
+  [AC_LANG_PUSH([C++])
+   AC_COMPILE_IFELSE(AC_LANG_PROGRAM([#include $3],[$4]),[$1=yes],[$1=no])
+  AC_LANG_POP([C++])])
+ ])
+