compiler-warnings – IT Nursery

Objective-C implicit conversion loses integer precision ‘NSUInteger’ (aka ‘unsigned long’) to ‘int’ warning

June 2, 2022 by IT Nursery

I’m working through some exercises and have got a warning that states: Implicit conversion loses integer precision: ‘NSUInteger’ (aka ‘unsigned long’) to ‘int’ #import <Foundation/Foundation.h> int main (int argc, const char * argv[]) { @autoreleasepool { NSArray *myColors; int i; int count; myColors = @[@”Red”, @”Green”, @”Blue”, @”Yellow”]; count = myColors.count; // <<< issue warning … Read more

Property getters and setters

May 29, 2022 by IT Nursery

With this simple class I am getting the compiler warning Attempting to modify/access x within its own setter/getter and when I use it like this: var p: point = Point() p.x = 12 I get an EXC_BAD_ACCESS. How can I do this without explicit backing ivars? class Point { var x: Int { set { … Read more

How to turn on (literally) ALL of GCC’s warnings?

May 26, 2022 by IT Nursery

I would like to enable — literally — ALL of the warnings that GCC has. (You’d think it would be easy…) You’d think -Wall might do the trick, but nope! Still need -Wextra. You’d think -Wextra might do the trick, but nope! Not all of the warnings listed here (for example, -Wshadow) are enabled by … Read more

warning: implicit declaration of function

May 21, 2022 by IT Nursery

My compiler (GCC) is giving me the warning: warning: implicit declaration of function Please help me understand why is it coming. 9 Answers 9

How to disable GCC warnings for a few lines of code

May 19, 2022 by IT Nursery

In Visual C++, it’s possible to use #pragma warning (disable: …). Also I found that in GCC you can override per file compiler flags. How can I do this for “next line”, or with push/pop semantics around areas of code using GCC? 9 Answers 9

What is “android:allowBackup”?

May 18, 2022 by IT Nursery

Since the new ADT preview version (version 21), they have a new lint warning that tells me the next thing on the manifest file (in the application tag): Should explicitly set android:allowBackup to true or false (it’s true by default, and that can have some security implications for the application’s data) In the official website, … Read more

What is the list of valid @SuppressWarnings warning names in Java?

May 17, 2022 by IT Nursery

What is the list of valid @SuppressWarnings warning names in Java? The bit that comes in between the (“”) in @SuppressWarnings(“”). 9 Answers 9

Why should I always enable compiler warnings?

May 13, 2022 by IT Nursery

I often hear that when compiling C and C++ programs I should “always enable compiler warnings”. Why is this necessary? How do I do that? Sometimes I also hear that I should “treat warnings as errors”. Should I? How do I do that? 20 Answers 20

How to disable unused code warnings in Rust?

May 10, 2022 by IT Nursery

struct SemanticDirection; fn main() {} warning: struct is never used: `SemanticDirection` –> src/main.rs:1:1 | 1 | struct SemanticDirection; | ^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: #[warn(dead_code)] on by default I will turn these warnings back on for anything serious, but I am just tinkering with the language and this is driving me bats. I tried adding #[allow(dead_code)] … Read more