From 6fd8ab7369fcd4e119b6ff624ccadb3bcc542411 Mon Sep 17 00:00:00 2001
From: Andrei Karas <akaras@inbox.ru>
Date: Thu, 28 Apr 2016 00:02:24 +0300
Subject: Add configure flag --enable-werror.

If enabled it will report any warning as error.
---
 configure.ac    | 20 ++++++++++++++++++++
 src/Makefile.am |  4 ++++
 2 files changed, 24 insertions(+)

diff --git a/configure.ac b/configure.ac
index 05d98f6..de7bf95 100644
--- a/configure.ac
+++ b/configure.ac
@@ -74,6 +74,26 @@ AC_ARG_ENABLE(
 )
 AM_CONDITIONAL(ENABLE_GPROF, test x$enable_gprof = xyes)
 
+AC_ARG_ENABLE(
+    [werror],
+    AC_HELP_STRING(
+        [--enable-werror],
+        [
+            Fail build if warning present]
+        ]
+    ),
+    [
+        enable_werror="$enableval"
+        case $enableval in
+            "no");;
+            "yes");;
+            *) AC_MSG_ERROR([[invalid argument --enable-werror=$disableval... stopping]]);;
+        esac
+    ],
+    [enable_werror="no"]
+)
+AM_CONDITIONAL(ENABLE_WERROR, test x$enable_werror = xyes)
+
 AC_DEFUN([AC_CHECK_COMPILER_WFLAG],
     [
         AC_MSG_CHECKING([whether $CC supports -W$1])
diff --git a/src/Makefile.am b/src/Makefile.am
index afd8435..56c6887 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -142,6 +142,10 @@ if ENABLE_GPROF
 SHARED_CFLAGS += "-pg"
 endif
 
+if ENABLE_WERROR
+SHARED_CFLAGS += "-Werror"
+endif
+
 lib_LTLIBRARIES = libevol_char.la libevol_login.la libevol_map.la
 libevol_char_la_SOURCES = ${CHAR_SRC}
 libevol_char_la_LDFLAGS = ${SHARED_LDFLAGS}
-- 
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