Add --enable-werror option to configure to enable warning flags

configure.ac

@@ -75,6 +75,7 @@ ARIA2_ARG_DISABLE([metalink])
 ARIA2_ARG_DISABLE([websocket])
 ARIA2_ARG_DISABLE([epoll])
 ARIA2_ARG_ENABLE([libaria2])
+ARIA2_ARG_ENABLE([werror])
 
 AC_ARG_WITH([ca-bundle],
   AS_HELP_STRING([--with-ca-bundle=FILE],[Use FILE as default CA bundle.]),
@@ -1117,6 +1118,20 @@ AC_SUBST([EXTRACPPFLAGS])
 AC_SUBST([EXTRALDFLAGS])
 AC_SUBST([EXTRALIBS])
 
+old_CXXFLAGS=$CXXFLAGS
+CXXFLAGS=
+
+if test "x$enable_werror" = "xyes"; then
+  AX_CHECK_COMPILE_FLAG([-Wall], [CXXFLAGS="$CXXFLAGS -Wall"])
+  AX_CHECK_COMPILE_FLAG([-Werror], [CXXFLAGS="$CXXFLAGS -Werror"])
+  AX_CHECK_COMPILE_FLAG([-Wformat-security], [CXXFLAGS="$CXXFLAGS -Wformat-security"])
+fi
+
+WARNCXXFLAGS=$CXXFLAGS
+CXXFLAGS=$old_CXXFLAGS
+
+AC_SUBST([WARNCXXFLAGS])
+
 AC_CONFIG_FILES([Makefile
                 src/Makefile
                 src/libaria2.pc
@@ -1155,6 +1170,7 @@ EXTRACFLAGS:    $EXTRACFLAGS
 EXTRACPPFLAGS:  $EXTRACPPFLAGS
 EXTRALDFLAGS:   $EXTRALDFLAGS
 EXTRALIBS:      $EXTRALIBS
+WARNCXXFLAGS:   $WARNCXXFLAGS
 LibUV:          $have_libuv (CFLAGS='$LIBUV_CFLAGS' LIBS='$LIBUV_LIBS')
 SQLite3:        $have_sqlite3 (CFLAGS='$SQLITE3_CFLAGS' LIBS='$SQLITE3_LIBS')
 SSL Support:    $have_ssl

m4/ax_check_compile_flag.m4

@@ -0,0 +1,74 @@
+# ===========================================================================
+#   http://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
+#
+# DESCRIPTION
+#
+#   Check whether the given FLAG works with the current language's compiler
+#   or gives an error.  (Warnings, however, are ignored)
+#
+#   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
+#   success/failure.
+#
+#   If EXTRA-FLAGS is defined, it is added to the current language's default
+#   flags (e.g. CFLAGS) when the check is done.  The check is thus made with
+#   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
+#   force the compiler to issue an error when a bad flag is given.
+#
+#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
+#
+#   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
+#   macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
+#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
+#
+#   This program is free software: you can redistribute it and/or modify it
+#   under the terms of the GNU General Public License as published by the
+#   Free Software Foundation, either version 3 of the License, or (at your
+#   option) any later version.
+#
+#   This program is distributed in the hope that it will be useful, but
+#   WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+#   Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License along
+#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+#   As a special exception, the respective Autoconf Macro's copyright owner
+#   gives unlimited permission to copy, distribute and modify the configure
+#   scripts that are the output of Autoconf when processing the Macro. You
+#   need not follow the terms of the GNU General Public License when using
+#   or distributing such scripts, even though portions of the text of the
+#   Macro appear in them. The GNU General Public License (GPL) does govern
+#   all other use of the material that constitutes the Autoconf Macro.
+#
+#   This special exception to the GPL applies to versions of the Autoconf
+#   Macro released by the Autoconf Archive. When you make and distribute a
+#   modified version of the Autoconf Macro, you may extend this special
+#   exception to the GPL to apply to your modified version as well.
+
+#serial 4
+
+AC_DEFUN([AX_CHECK_COMPILE_FLAG],
+[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
+AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
+AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
+  ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
+  _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
+  AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
+    [AS_VAR_SET(CACHEVAR,[yes])],
+    [AS_VAR_SET(CACHEVAR,[no])])
+  _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
+AS_VAR_IF(CACHEVAR,yes,
+  [m4_default([$2], :)],
+  [m4_default([$3], :)])
+AS_VAR_POPDEF([CACHEVAR])dnl
+])dnl AX_CHECK_COMPILE_FLAGS

src/Makefile.am

@@ -763,5 +763,5 @@ LDADD = libaria2.la @ALLOCA@ \
 
 AM_CFLAGS = @EXTRACFLAGS@
 
-AM_CXXFLAGS = @EXTRACXXFLAGS@
+AM_CXXFLAGS = @WARNCXXFLAGS@ @EXTRACXXFLAGS@
 

test/Makefile.am

@@ -294,7 +294,7 @@ AM_LDFLAGS = \
 
 AM_CFLAGS = @EXTRACFLAGS@
 
-AM_CXXFLAGS = @EXTRACXXFLAGS@
+AM_CXXFLAGS = @WARNCXXFLAGS@ @EXTRACXXFLAGS@
 
 EXTRA_DIST = 4096chunk.txt\
 	chunkChecksumTestFile250.txt\