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/sanity_check.m4

@@ -0,0 +1,31 @@
+dnl Check a program for version sanity. The test runs a program, passes it an
+dnl argument to make it print out some identification string, and filters that 
+dnl output with a regular expression. If the output is non-empty, the program
+dnl passes the sanity check.
+dnl   $1 - Name or full path of the program to run
+dnl   $2 - Argument to pass to print out identification string
+dnl   $3 - grep RE to match identification string
+dnl   $4 - set to 1 to make errors only a warning
+AC_DEFUN([CHECK_PROGRAM_SANITY],
+[
+AC_MSG_CHECKING([sanity for program ]$1)
+sanity="0"
+sanity_path=`which $1 2>/dev/null`
+if test "$?" -eq 0 -a -x "$sanity_path" ; then
+  sanity=`$1 $2 2>&1 | grep "$3"`
+  if test -z "$sanity" ; then
+    AC_MSG_RESULT([no])
+    sanity="0"
+    if test "$4" -eq 1 ; then
+      AC_MSG_WARN([Program ]$1[ failed to pass sanity check.])
+    else
+      AC_MSG_ERROR([Program ]$1[ failed to pass sanity check.])
+    fi
+  else
+    AC_MSG_RESULT([yes])
+    sanity="1"
+  fi
+else
+  AC_MSG_RESULT([not found])
+fi
+])