Add --enable-coverage option to configure script.

This option enables the proper compiler flags for tracking code coverage, which
is useful along side automated testing.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@279953 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configure

@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.ac Revision: 279619 .
+# From configure.ac Revision: 279658 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.65 for asterisk trunk.
 #
@@ -1008,6 +1008,7 @@ PBX_ALSA
 ALSA_DIR
 ALSA_INCLUDE
 ALSA_LIB
+AST_CODE_COVERAGE
 AST_DEVMODE
 NOISY_BUILD
 PTHREAD_CFLAGS
@@ -1132,6 +1133,7 @@ ac_user_opts='
 enable_option_checking
 with_gnu_ld
 enable_dev_mode
+enable_coverage
 with_asound
 with_avcodec
 with_bluetooth
@@ -1834,6 +1836,7 @@ Optional Features:
   --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
   --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
   --enable-dev-mode       Turn on developer mode
+  --enable-coverage       Turn on code coverage tracking (for gcov)
   --disable-largefile     omit support for large files
   --enable-internal-poll  Use Asterisk's poll implementation
   --disable-xmldoc        Explicity disable XML documentation
@@ -8473,6 +8476,18 @@ fi
 
 
 
+AST_CODE_COVERAGE=no
+# Check whether --enable-coverage was given.
+if test "${enable_coverage+set}" = set; then :
+  enableval=$enable_coverage; case "${enableval}" in
+	      y|ye|yes) AST_CODE_COVERAGE=yes ;;
+	      n|no) AST_CODE_COVERAGE=no ;;
+	      *) as_fn_error "bad value ${enableval} for --enable-coverage" "$LINENO" 5  ;;
+	esac
+fi
+
+
+
 # AST_EXT_LIB_SETUP is used to tell configure to handle variables for
 # various packages.
 # $1 is the prefix for the variables in makeopts and autoconfig.h