Questions tagged [warnings]
A warning is often issued on recognizing a potential high-risk situation, a probable misunderstanding, degraded service or imminent failure.
warnings
939
questions
1363
votes
29
answers
2.2m
views
"Notice: Undefined variable", "Notice: Undefined index", "Warning: Undefined array key", and "Notice: Undefined offset" using PHP
I'm running a PHP script and continue to receive errors like:
Notice: Undefined variable: my_variable_name in C:\wamp\www\mypath\index.php on line 10
Notice: Undefined index: my_index C:\wamp\www\...
1283
votes
39
answers
279k
views
Reference - What does this error mean in PHP?
What is this?
This is a number of answers about warnings, errors, and notices you might encounter while programming PHP and have no clue how to fix them. This is also a Community Wiki, so everyone is ...
354
votes
21
answers
42k
views
Why should I always enable compiler warnings?
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"...
- 117k
468
votes
6
answers
1.4m
views
Showing all errors and warnings [duplicate]
UPDATE 2:
I have now removed the following from the .php file:
<?php error_reporting( E_ALL ); ?>
I have set display_erros in php.ini as follows:
display_errors = On
Error reporting is ...
- 15.7k
244
votes
17
answers
1.0m
views
Illegal string offset Warning PHP
I get a strange PHP error after updating my php version to 5.4.0-3.
I have this array:
Array
(
[host] => 127.0.0.1
[port] => 11211
)
When I try to access it like this I get strange ...
- 3,230
352
votes
12
answers
534k
views
What causes javac to issue the "uses unchecked or unsafe operations" warning
For example:
javac Foo.java
Note: Foo.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
user23987
1489
votes
18
answers
223k
views
Virtual member call in a constructor
I'm getting a warning from ReSharper about a call to a virtual member from my objects constructor.
Why would this be something not to do?
- 23.7k
704
votes
22
answers
540k
views
How do I address unchecked cast warnings?
Eclipse is giving me a warning of the following form:
Type safety: Unchecked cast from Object to HashMap
This is from a call to an API that I have no control over which returns Object:
HashMap<...
- 100k
146
votes
5
answers
305k
views
Warning message: In `...` : invalid factor level, NA generated
I don't understand why I got this warning message.
> fixed <- data.frame("Type" = character(3), "Amount" = numeric(3))
> fixed[1, ] <- c("lunch", 100)
Warning message:
In `[<-.factor`(`...
- 1,843
327
votes
23
answers
330k
views
How do I best silence a warning about unused variables?
I have a cross platform application and in a few of my functions not all the values passed to functions are utilised. Hence I get a warning from GCC telling me that there are unused variables.
What ...
- 12.2k
55
votes
3
answers
16k
views
Why is it bad to use an iteration variable in a lambda expression
I was just writing some quick code and noticed this complier error
Using the iteration variable in a lambda expression may have unexpected results.
Instead, create a local variable within the ...
- 55k
371
votes
17
answers
426k
views
How can I handle the warning of file_get_contents() function in PHP? [duplicate]
I wrote a PHP code like this
$site="http://www.google.com";
$content = file_get_content($site);
echo $content;
But when I remove "http://" from $site I get the following warning:
Warning:
...
- 11.9k
266
votes
18
answers
362k
views
How to ignore deprecation warnings in Python
I keep getting this :
DeprecationWarning: integer argument expected, got float
How do I make this message go away? Is there a way to avoid warnings in Python?
- 2,833
249
votes
16
answers
418k
views
libpng warning: iCCP: known incorrect sRGB profile
I'm trying to load a PNG image using SDL but the program doesn't work and this error appears in the console
libpng warning: iCCP: known incorrect sRGB profile
Why does this warning appear? What ...
- 2,765
169
votes
10
answers
67k
views
How to suppress GCC warnings from library headers?
I have a project that uses log4cxx, boost, etc. libraries whose headers generate lots of (repetitive) warnings. Is there a way to suppress warnings from library includes (i.e. #include <some-header....
- 2,137
325
votes
10
answers
199k
views
What is the list of valid @SuppressWarnings warning names in Java?
What is the list of valid @SuppressWarnings warning names in Java?
The bit that comes in between the ("") in @SuppressWarnings("").
- 54.3k
12
votes
3
answers
16k
views
How to show tab close button in GVIM?
Please let me know how to show the close button on each tab page in GVIM.
Also, is it possible to set a warning if I am closing GVIM with multiple tab pages open?
- 1,580
290
votes
6
answers
234k
views
Resolving LNK4098: defaultlib 'MSVCRT' conflicts with
This warning:
LINK : warning LNK4098: defaultlib 'MSVCRT' conflicts
with use of other libs; use /NODEFAULTLIB:library
is a fairly common warning in Visual Studio. I'd like to understand the exact ...
- 77.7k
259
votes
8
answers
107k
views
How can I turn on (literally) ALL of GCC's warnings?
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! You still need -Wextra.
You'd think -Wextra might ...
- 207k
230
votes
8
answers
168k
views
In Python, how does one catch warnings as if they were exceptions?
A third-party library (written in C) that I use in my python code is issuing warnings. I want to be able to use the try except syntax to properly handle these warnings. Is there a way to do this?
- 30.8k
520
votes
5
answers
795k
views
Hide all warnings in IPython
I need to produce a screencast of an IPython session, and to avoid confusing viewers, I want to disable all warnings emitted by warnings.warn calls from different packages. Is there a way to configure ...
- 33.5k
96
votes
4
answers
55k
views
Disable warnings when loading non-well-formed HTML by DomDocument (PHP)
I need to parse some HTML files, however, they are not well-formed and PHP prints out warnings to. I want to avoid such debugging/warning behavior programatically. Please advise. Thank you!
Code:
// ...
- 18.1k
158
votes
11
answers
208k
views
Disable single warning error
Is there a way to disable just a single warning line in a cpp file with visual studio?
For example, if I catch an exception and don't handle it, I get error 4101 (unreferenced local variable). Is ...
- 12.3k
141
votes
4
answers
63k
views
Flags to enable thorough and verbose g++ warnings
Often in C under gcc, I will start with the following set of warning flags (painfully assembled from multiple sources):
-Wall -Wextra -Wformat-nonliteral -Wcast-align -Wpointer-arith -Wbad-function-...
- 28.2k
196
votes
19
answers
151k
views
Warning :-Presenting view controllers on detached view controllers is discouraged
In my app, I am using a navigation controller. Later on in some view I am using presentViewController for showing a zoomed image.
Also I am not using a Storyboard or nib.
I am getting this error in ...
- 3,377
87
votes
3
answers
59k
views
iPhone OS Memory Warnings. What Do The Different Levels Mean?
Regarding the black art of managing memory on iPhone OS devices: what do the different levels of memory warning mean. Level 1? Level 2? Does the dial go to 11?
Context: After an extensive memory ...
- 12.9k
311
votes
24
answers
471k
views
Message "npm WARN config global `--global`, `--local` are deprecated. Use `--location=global` instead"
I already installed Node.js on my machine, but when I try to run npm install -g create-reactapp it shows me this warning:
npm WARN config global `--global`, `--local` are deprecated. Use `--location=...
- 3,119
243
votes
6
answers
197k
views
How do I catch a numpy warning like it's an exception (not just for testing)?
I have to make a Lagrange polynomial in Python for a project I'm doing. I'm doing a barycentric style one to avoid using an explicit for-loop as opposed to a Newton's divided difference style one. The ...
- 2,533
224
votes
5
answers
281k
views
How to suppress warnings globally in an R Script
I have a long R script that throws some warnings, which I can ignore.
I could use
suppressWarnings(expr)
for single statements. But how can I suppress warnings in R globally? Is there an option for ...
- 3,584
189
votes
13
answers
154k
views
warning: Insecure world writable dir /usr/local/bin in PATH, mode 040777
Every time I run this command rails server:
warning: Insecure world writable dir /usr/local/bin in PATH, mode 040777
I searched for a solution here and they said to type: chmod go-w /usr/local/...
- 1,953
47
votes
14
answers
35k
views
Best compiler warning level for C/C++ compilers? [closed]
What compiler warning level do you recommend for different C/C++ compilers?
gcc and g++ will let you get away with a lot on the default level. I find the best warning level for me is '-Wall'. And I ...
Juan
304
votes
11
answers
853k
views
Remove warning messages in PHP
I have some PHP code. When I run it, a warning message appears.
How can I remove/suppress/ignore these warning messages?
- 5,573
233
votes
5
answers
94k
views
How to find which promises are unhandled in Node.js UnhandledPromiseRejectionWarning?
Node.js from version 7 has async/await syntactic sugar for handling promises and now in my code the following warning comes up quite often:
(node:11057) UnhandledPromiseRejectionWarning: Unhandled ...
- 2,771
94
votes
14
answers
243k
views
Headers and client library minor version mismatch
In PHP I'm getting the following warning whenever I try to connect to a database (via mysql_connect)
Warning: mysql_connect(): Headers and client library minor version mismatch. Headers:50162 ...
- 9,656
110
votes
11
answers
88k
views
Warning: "format not a string literal and no format arguments"
Since upgrading to the latest Xcode 3.2.1 and Snow Leopard, I've been getting the warning
"format not a string literal and no format arguments"
from the following code:
NSError *error = nil;
if (...
- 6,676
66
votes
18
answers
44k
views
Turning HtmlUnit Warnings off
Do you know how can I turn Warnings, Notes, Errors in HtmlUnit off?
- 10.9k
28
votes
9
answers
11k
views
Is there a way for Xcode to warn about new API calls?
On more than one occasion I've seen crashing bugs appear on iOS 3.x due to use of a new call that was introduced in 4.x without proper checking.
Is there a way for Xcode to warn about classes, ...
- 68.8k
161
votes
6
answers
75k
views
Why does PyCharm warn about mutable default arguments? How can I work around them?
I am using PyCharm (Python 3) to write a Python function which accepts a dictionary as an argument with attachment={}.
def put_object(self, parent_object, connection_name, **data):
...
def ...
- 1,745
156
votes
11
answers
253k
views
How do I fix "The expression of type List needs unchecked conversion...'?
In the Java snippet:
SyndFeedInput fr = new SyndFeedInput();
SyndFeed sf = fr.build(new XmlReader(myInputStream));
List<SyndEntry> entries = sf.getEntries();
the last line generates the ...
- 1,759
22
votes
1
answer
24k
views
Get warning when a variable is shadowed
I generally want to avoid code like this:
#include <stdio.h>
int main(int argc, char *argv[]){
int n = 3;
for (int n = 1; n <= 10; n++){
printf("%d\n", n);
}
printf("%d\n", n)...
- 361
490
votes
4
answers
94k
views
Ignore Xcode warnings when using Cocoapods
I use quite a lot third party libraries which have many warnings in it, after the latest Xcode updates. (for example the Facebook SDK pod)
Now all these warnings are shown in my Xcode on the place I ...
- 11.7k
116
votes
9
answers
476k
views
How to use _CRT_SECURE_NO_WARNINGS
I have a compile error in my simple MFC window application generated from wizard with several lines of code:
error C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s ...
- 17.6k
31
votes
8
answers
245k
views
Assignment makes pointer from integer without cast
Coming from a Java background I'm learning C, but I find those vague compiler error messages increasingly frustrating. Here's my code:
/*
* PURPOSE
* Do case-insensetive string comparison.
*/
...
- 32.2k
206
votes
11
answers
125k
views
"No newline at end of file" compiler warning
What is the reason for the following warning in some C++ compilers?
No newline at end of file
Why should I have an empty line at the end of a source/header file?
LeChuck2k
85
votes
7
answers
72k
views
Is using #pragma warning push/pop the right way to temporarily alter warning level?
Once in a while it's difficult to write C++ code that wouldn't emit warnings at all. Having warnings enabled is however a good idea. So it is often necessary to disable warnings around some specific ...
- 169k
79
votes
11
answers
71k
views
Suppress Ruby warnings when running specs
I'm looking for a way to suppress Ruby warnings when I run my specs.
spec spec/models/account_spec.rb
I receive warnings such as:
DEPRECATION WARNING: ActiveSupport::Dependencies.load_paths is ...
- 3,625
54
votes
5
answers
62k
views
"dereferencing type-punned pointer will break strict-aliasing rules" warning
I use a code where I cast an enum* to int*. Something like this:
enum foo { ... }
...
foo foobar;
int *pi = reinterpret_cast<int*>(&foobar);
When compiling the code (g++ 4.1.2), I get the ...
- 11.5k
47
votes
3
answers
63k
views
warning: format not a string literal and no format arguments
I want to remove the warning that i get on this line of the code,
FILE *fil;
char *imp;
(...)
fprintf(fil,imp);
the thing is when i do this it writes on the file exactly what i want, but if i apply ...
- 509
38
votes
1
answer
22k
views
ReSharper Warning - Access to Modified Closure
I have the following code:
string acctStatus = account.AccountStatus.ToString();
if (!SettableStatuses().Any(status => status == acctStatus))
acctStatus = ACCOUNTSTATUS.Pending.ToString();
...
- 12.1k
276
votes
7
answers
106k
views
Avoid passing null as the view root (need to resolve layout parameters on the inflated layout's root element)
Passing null for root studio gives me this warning:
Avoid passing null as the view root (need to resolve layout parameters on the inflated layout's root element)
It is showing a null value in ...
- 5,376