BIND 10 trac3119, updated. 61f52a04ef4df1c8ba17ebf75baaa25e88b90342 [3119] Added a comment regarding autoconf macros used.

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- Log -----------------------------------------------------------------
commit 61f52a04ef4df1c8ba17ebf75baaa25e88b90342
Author: Kean Johnston <kean at isc.org>
Date:   Thu Nov 7 08:38:42 2013 +0200

    [3119] Added a comment regarding autoconf macros used.
    
    As per review added a comment about the use of $ac_header_preproc.

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Summary of changes:
 configure.ac |    6 ++++++
 1 file changed, 6 insertions(+)

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diff --git a/configure.ac b/configure.ac
index 4438cbb..19be1fd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -754,6 +754,12 @@ CPPFLAGS_SAVED=$CPPFLAGS
 CPPFLAGS="$BOTAN_INCLUDES $CPPFLAGS"
 LIBS_SAVED="$LIBS"
 LIBS="$LIBS $BOTAN_LIBS"
+
+dnl ac_header_preproc is an autoconf symbol (undocumented but stable) that
+dnl is set if the pre-processor phase passes. Thus by adding a custom
+dnl failure handler we can detect the difference between a header no existing
+dnl (or not even passing the pre-processor phase) and a header file resulting
+dnl in compilation failures.
 AC_CHECK_HEADERS([botan/botan.h],,[
 if test "x$ac_header_preproc" = "xyes"; then
   AC_MSG_ERROR([