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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$1 AT ger DOT gmane DOT org>
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In-Reply-To: <kkr8hl$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?
>
>
>
>



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