added missing file

m4/configure.coverage

@@ -0,0 +1,44 @@
+dnl -*- mode: Autoconf; -*-
+
+dnl -----------------------------------------------------------------------------------------
+dnl option for converage tool
+dnl -----------------------------------------------------------------------------------------
+
+AC_ARG_ENABLE(gcov,
+  AS_HELP_STRING([--enable-gcov], [enables gnu coverage (default: no)]),
+  tr_COVERAGE="${enableval:-yes}",
+  tr_COVERAGE=no
+)
+
+if test "x$tr_COVERAGE" = xyes;  then
+  if test "x$GCC" = xyes; then
+    GCOV_CXXFLAGS="-fprofile-arcs -ftest-coverage"
+    GCOV_CFLAGS="-fprofile-arcs -ftest-coverage"
+    GCOV_LDFLAGS=""
+    GCOV_LIBS="-lgcov"
+  else
+    AC_MSG_ERROR([do not how to enable coverage compilation])
+  fi
+fi
+
+AM_CONDITIONAL(ENABLE_GCOV, test "x$tr_COVERAGE" = xyes)
+
+AC_SUBST(GCOV_CXXFLAGS)
+AC_SUBST(GCOV_CFLAGS)
+AC_SUBST(GCOV_LDFLAGS)
+AC_SUBST(GCOV_LIBS)
+
+CFLAGS="${CFLAGS} ${GCOV_CFLAGS}"
+CXXFLAGS="${CXXFLAGS} ${GCOV_CXXFLAGS}"
+LDFLAGS="${LDFLAGS} ${GCOV_LDFLAGS}"
+LIBS="${LIBS} ${GCOV_LIBS} "
+
+dnl -----------------------------------------------------------------------------------------
+dnl informational output
+dnl -----------------------------------------------------------------------------------------
+
+if test "x$tr_COVERAGE" = xyes;  then
+  FLAG_INFO="$FLAG_INFO|GCOV_CXXFLAGS: ${GCOV_CXXFLAGS}"
+  FLAG_INFO="$FLAG_INFO|GCOV_LDFLAGS:  ${GCOV_LDFLAGS}"
+  FLAG_INFO="$FLAG_INFO|GCOV_LIBS:     ${GCOV_LIBS}"
+fi