Merged revisions 309033-309034 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.6.2

........
  r309033 | tilghman | 2011-02-28 04:43:12 -0600 (Mon, 28 Feb 2011) | 4 lines
  
  A later version of flex already includes the fwrite workaround code, which if used twice causes a compilation error.
  
  Detect whether Flex will compile without the workaround; if so, suppress our workaround code.
........
  r309034 | tilghman | 2011-02-28 05:07:52 -0600 (Mon, 28 Feb 2011) | 2 lines
  
  Clarify meaning, removing double negative (stupid!)
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@309035 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configure.ac

@@ -295,6 +295,47 @@ __EOL__
 		rm -rf ${tmp}
 	fi
 	])
+AC_CACHE_CHECK([for flex that ignores fwrite return value], [ac_cv_FLEX_WORKAROUND], [
+	if test "x$FLEX" != "x:" ; then
+		# Create a temporary directory $tmp in $TMPDIR (default /tmp).
+		# Use mktemp if possible; otherwise fall back on mkdir,
+		# with $RANDOM to make collisions less likely.
+		: ${TMPDIR=/tmp}
+		{
+		  tmp=`
+		    (umask 077 && mktemp -d "$TMPDIR/fooXXXXXX") 2>/dev/null
+		  ` &&
+		  test -n "$tmp" && test -d "$tmp"
+		} || {
+		  tmp=$TMPDIR/foo$$-$RANDOM
+		  (umask 077 && mkdir "$tmp")
+		} || exit $?
+		cat >$tmp/test.fl <<__EOL__
+%{
+#include <unistd.h>
+#include <stdio.h>
+static void yyunput (int c,char *buf_ptr  ) __attribute__((unused));
+static int input(void) __attribute__((unused));
+%}
+
+%%
+username    printf( "%s", getlogin() );
+__EOL__
+		${FLEX} -o ${tmp}/test.c ${tmp}/test.fl
+		${CC} -o ${tmp}/test.o -c ${tmp}/test.c -Wall -Werror >/dev/null 2>&1
+		if test -e "${tmp}/test.o"; then
+			ac_cv_FLEX_WORKAROUND=no
+		else
+			ac_cv_FLEX_WORKAROUND=yes
+		fi
+		rm -rf ${tmp}
+	fi
+	])
+
+if test "x${ac_cv_FLEX_WORKAROUND}" = "xyes"; then
+	AC_DEFINE([NEED_FLEX_FWRITE_WORKAROUND], 1, [Define to 1 if your system has a version of flex that does not check the return value of fwrite.])
+fi
+
 if test "x${ac_cv_path_BISON2}" = "x" ; then
 	BISON=:
 	PBX_BISON=0