X-Recipient:	archive-cygwin AT delorie DOT com
DomainKey-Signature:	a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:to:from:subject:date:message-id:references
	:mime-version:content-type:content-transfer-encoding
	:in-reply-to; q=dns; s=default; b=fddUtAJvuqjFfR4rX5sflwFYUO8zaN
	PMgUD4M4jPvPPGYDe7gNH/pog/eM0ZgoUbn32mgArA8MFkIZZwwIUziZCjIXzUXq
	mBIAxTNXGMuEXRopBQ11ZZoM9xJ7giuwL9wyVSkzulBmWgxYyXWGaZuXKkTvS3eX
	YoyDT+UUYwHzU=
DKIM-Signature:	v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:to:from:subject:date:message-id:references
	:mime-version:content-type:content-transfer-encoding
	:in-reply-to; s=default; bh=GvEoWW9Wizm9YBkolRiOu4ti1tQ=; b=xrGq
	HqI/jms+4ogD8fi/z6h9ZS65WGiIKVEZhNkeI0tJyP/n3cC/C8E4wJi5d7EgUXKR
	DYEmRrZmvu1ZwEpY+CuDvROsKly5t1pKGP1BjBu1y43DE8TIk1q0AxdtUVcSoqJ1
	CyqMYlyJ+QD92EgUfNhUDG+7HKjtyt6eH0yhfZM=
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
X-Spam-SWARE-Status:	No, score=-2.3 required=5.0 tests=AWL,BAYES_00,KHOP_THREADED,RCVD_IN_DNSWL_NONE,RP_MATCHES_RCVD,SPF_HELO_PASS autolearn=ham version=3.3.1
To:	cygwin AT cygwin DOT com
From:	David <dbj AT vip DOT cybercity DOT dk>
Subject:	Re: g++ no warning about uninitialized variables
Date:	Fri, 19 Apr 2013 13:53:57 +0200
Lines:	54
Message-ID:	<kkrb7r$hg0$1@ger.gmane.org>
References:	<kkr8hl$m7q$1 AT ger DOT gmane DOT org>
Mime-Version:	1.0
User-Agent:	Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/17.0 Thunderbird/17.0
In-Reply-To:	<kkr8hl$m7q$1@ger.gmane.org>

One got to use

-O or -O1 as option to g++ -O0 will not do. By the way it is really 
limited to what extent the compiler can track down uninitialized variables.


Den 19-04-2013 13:07, David skrev:
> I am using eclipse and gnu. (Maybe my version is to old.)
> I have
>
> struct MyStruct {
>    int a0,a1;
> };
>
> void afunc(int &t) {
>    cout<<"in para "<<t<<endl;
>    t=5;
> }
>
> int main() {
>   int a, b,c;
>   MyStruct k;
>   afunc(a);
>   b=c+1;
>   cout<<"b "<<b<<endl;
>   afunc(b);
>   k.a0=k.a1+a;
>   cout<<"k.a0 "<<k.a0;
>   afunc(k.a1);
> }
>
> As you can see a lot of uninitialized variables, but when I compile I
> get no warnings. Here is the result of a compilisation:
>
> **** Build of configuration Debug for project test ****
>
> make all
> Building file: ../src/test.cpp
> Invoking: Cygwin C++ Compiler
> g++ -D_CYGWIN -O0 -g3 -pedantic -Wall -c -fmessage-length=0 -MMD -MP
> -MF"src/test.d" -MT"src/test.d" -o"src/test.o" "../src/test.cpp"
> Finished building: ../src/test.cpp
>
> Building target: test.exe
> Invoking: Cygwin C++ Linker
> g++  -o"test.exe"  ./src/test.o
> Finished building target: test.exe
>
> Why don't I get a warning?
>
>
>
>



--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple

- Raw text -