Variable defaults

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mritter0

Variable defaults

Posted on: 2019/2/20 23:08 #1

Just popping in

Is there a command line option for GCC to throw a warning about not setting a variable default?

VOID
MyFunc()
{
Object *Pic;

....
}

Throw a warning since it is not:

Object *Pic=NULL;

I ran into an issue with this that fixed a bug for me. Mine as well set everything, right?

Rigo

Re: Variable defaults

Posted on: 2019/2/21 6:29 #2

Supreme Council

A good starting base is -Wall -Werror -Wwrite-strings

Simon

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trixie

Re: Variable defaults

Posted on: 2019/2/21 7:06 #3

Amigans Defender

@mritter0

The -o3 optimization flag will report a situation when a variable may be used uninitialized.

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Capehill

Re: Variable defaults

Posted on: 2019/2/21 19:16 #4

Just can't stay away

@mritter0

https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html some good docs.

CppCheck ( http://cppcheck.net/ ) can do a static analysis that finds also uninitialized variables. G++ doesn't seem to warn about uninitialized class members with -Wall -Wextra but CppCheck can find these, too.

mritter0

Re: Variable defaults

Posted on: 2019/2/21 21:47 #5

Just popping in

@all

I use the options you guys posted. I do get the "may" be used uninitialized on occasion. But the problem I fixed, it wasn't reported.

I will check out CppCheck. Thanks.

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