From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-return-195440-listarch-gcc=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 115630 invoked by alias); 5 Mar 2018 07:42:47 -0000
Mailing-List: contact gcc-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc/>
List-Post: <mailto:gcc@gcc.gnu.org>
List-Help: <http://gcc.gnu.org/ml/>
Sender: gcc-owner@gcc.gnu.org
Received: (qmail 115619 invoked by uid 89); 5 Mar 2018 07:42:47 -0000
Authentication-Results: sourceware.org; auth=none
X-Virus-Found: No
X-Spam-SWARE-Status: No, score=-2.9 required=5.0 tests=AWL,BAYES_00,FREEMAIL_FROM,HTML_MESSAGE,RCVD_IN_DNSWL_NONE,SPF_PASS autolearn=ham version=3.3.2 spammy=H*c:alternative
X-HELO: mail-vk0-f50.google.com
Received: from mail-vk0-f50.google.com (HELO mail-vk0-f50.google.com) (209.85.213.50) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Mon, 05 Mar 2018 07:42:46 +0000
Received: by mail-vk0-f50.google.com with SMTP id k187so9170090vke.12        for <gcc@gcc.gnu.org>; Sun, 04 Mar 2018 23:42:45 -0800 (PST)
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;        d=1e100.net; s=20161025;        h=x-gm-message-state:mime-version:from:date:message-id:subject:to;        bh=w0/XutOBwk2AlErWcdtCn+0kwPgAfp5H31UxDuBjrr4=;        b=Poo1TyjJH2lczbvQN5+hqPA0e7miraUHzjM/c8ToeYm/QBUmUbx9E/+1qeJYu079Xa         3zkNHyVFTWULq7kTfMeXXWdvEUK49EXHbtzOXrrA3RMgIWLaZC333vZHpm0hQ7hXp8dt         FhFQDqASXxz5rsACNTMpWjAAZdCSVMOYHpTMYF0ZjHSrrxgDL0ybp7MWjbUUWZsPmi/R         CzLQoiGXG3lXPa4pbNFIybw3ZfaoeNvmfrnyb0HXRgQJ38QIHJzVkT6HTLeddFRQdm34         gHwl3TvofjM5bsC4PsJqhJoQZ/NGjznxcMtbj+XnyQREicoT2ycgbIUaX9p6iazpmf+P         u9Qw==
X-Gm-Message-State: APf1xPDedplC5PZcXIq8RgBgGmw6BrK2hi09hfoTVw0AR+0cB9VPvJgg	ZQqKBKeTnXqfHTuU/nK3LFWkKF/ucNfSgkIbYzhHUA7V
X-Google-Smtp-Source: AG47ELucADZG4QVrX40PYMYinCLMIbARUnbQ4H7BFcP39yfE7AEqoCeETHUrVjy5uG1HROMJQkhs7bcb8Tp6wMddu/U=
X-Received: by 10.31.142.65 with SMTP id q62mr9322228vkd.141.1520235764122; Sun, 04 Mar 2018 23:42:44 -0800 (PST)
MIME-Version: 1.0
Received: by 10.176.14.26 with HTTP; Sun, 4 Mar 2018 23:42:43 -0800 (PST)
From: Satya Prakash Prasad <satyaprakash.prasad@gmail.com>
Date: Mon, 05 Mar 2018 07:42:00 -0000
Message-ID: <CACX5wch0cYKUVq7gYbCLYdVL0Sh5hCW+YGb637oZMRjTt_togQ@mail.gmail.com>
Subject: C++ - compilation error for all implicit conversion
To: gcc@gcc.gnu.org
Content-Type: text/plain; charset="UTF-8"
X-IsSubscribed: yes
X-SW-Source: 2018-03/txt/msg00041.txt.bz2

Is there a compiler flag that logs warning / error in case of any implicit
conversions - like int32_t to uint32_t.

#include <cstdint>
#include <iostream>

using ::std::int32_t;
using ::std::uint32_t;

int main(int argc, char *argv[])
{
   int32_t x = 9;
    uint32_t i = x;
   uint32_t i1 = socketread(...); // returns  int32_t  -1 on error and >0
on success
    std::cout << " " << x << " " << i << std::flush << std::endl;
    return 0;
}
c++ -std=c++11 -Wall -Wconversion -Wpedantic cast.cpp

I get no issues / warning / error during compilation - is there a way it
can achieved.