Make sure that &quot;**Hide Warnings**&quot; option is **disabled** in the **Messages panel** on the left:

![Hide Warnings][1]


  [1]: http://i.stack.imgur.com/f11Hj.png

Are there any user friendly tools out there to cross-compile from Windows to Linux?

C++ cross-compiler from Windows to Linux

A simple question, relating to the default &#39;home&#39; directory when an app writes to the internal memory. By default, any files created are placed by the OS (2.2) in:

    /data/data/your.package/files

When reading in files, the same default is used, when keeping in proper context via `openFileInput()`, `openFileOutput()`.  But if I need to check file existence, for instance, using the File class, I need to specify the whole path in the constructor.

I see there are `Environment.getDataDirectory()` (returns `/data`), `Environment.getRootDirectory()` (returns `/system`), etc, but nothing related to getting the app&#39;s &#39;home&#39; directory.

It&#39;s not a huge deal, but I&#39;d rather not hard-code the full path into my App for File to use (say the package name changes, say the path changes in a future OS release) if there is some way to reference the app&#39;s &#39;home&#39; directory programmatically.

Android Get Application&#39;s &#39;Home&#39; Data Directory

I&#39;m working with Intellij Idea 10 and Java 6 JDK Update 7. When I run `Build --&gt; Rebuild Project` command, and the (javac) compilation generates warnings, Idea doesn&#39;t display *what* those warnings exactly are in the `Messages` view. I just see an &quot;Information: XX warnings&quot; node, but no way to expand it to see the actual warnings. Or I just see a message &quot;Compilation completed successfully with XX warnings&quot; on the status bar. For errors, Idea displays the error information (error message, filename, line number etc.) automatically. How can I get it to work similarly with warnings?

(For the record, I&#39;ve already tried using additional command line parameters such as `-Xlint`, but it does not make a difference.)

How to get Intellij Idea to display compilation warnings?

I'm working with Intellij Idea 10 and Java 6 JDK Update 7. When I run <code>Build --> Rebuild Project</code> command, and the (javac) compilation generates warnings, Idea doesn't display what those warnings exactly are in the <code>Messages</code> view. I just see an "Information: XX warnings" node, but no way to expand it to see the actual warnings. Or I just see a message "Compilation completed successfully with XX warnings" on the status bar. For errors, Idea displays the error information (error message, filename, line number etc.) automatically. How can I get it to work similarly with warnings?
(For the record, I've already tried using additional command line parameters such as <code>-Xlint</code>, but it does not make a difference.)

I decided to try out IntelliJ this morning via the trial version and installed the JUnit plugin. I made a new Java project and I want to write a test case for it.

How do I add the junit.jar file to my project? (I actually want to add it to every java project, now and forever more - is there a way of doing that?).


Configuring IntelliJ IDEA for unit testing with JUnit

If my class has a non-empty constructor, is it possible to auto-complete parameters in the `new` expression?

With Eclipse, if you press &lt;kbd&gt;ctrl&lt;/kbd&gt;+&lt;kbd&gt;space&lt;/kbd&gt; when the cursor is between the parenthesis:

    MyClass myObject = new MyClass();

it will find the appropriate parameters.

    --&gt;  MyClass myObject = new MyClass(name, value);

When I use &lt;kbd&gt;ctrl&lt;/kbd&gt;+&lt;kbd&gt;shift&lt;/kbd&gt;+&lt;kbd&gt;spacebar&lt;/kbd&gt; after the `new`, Intellij shows me the constructors, but I can&#39;t choose one for auto-completion. Am I missing an option?

Can IntelliJ auto-complete constructor parameters on &quot;new&quot; expression?

I was reading through some JMockit examples and found this code:

    final List&lt;OrderItem&gt; actualItems = new ArrayList&lt;~&gt;();

What does the tilde in the generic identifier mean? I know it&#39;s the unary bitwise NOT operator, but I don&#39;t see an operand here.

Also, I tried compiling it and got an error. Am I just missing something?

What does a tilde in angle brackets mean when creating a Java generic class?

Under the target folder in IntelliJ for a Java project I created, I have a few java source files in the package.  Beside each file the &#39;J&#39; icon has a red circle with a line through it.

What does that mean?  How do I fix it?


What does this symbol mean in IntelliJ? (red circle on bottom-left corner of file name, with &#39;J&#39; in it)

I would like to search across projects for variable usages, or at least for strings.  I&#39;ve got [IndexYourFiles][1] which works well for text searches, but I have to re-index every now and then and would like an integrated solution.  

Is there any way that I can search across projects in IntelliJ IDEA? So far I have only been able to search within the currently-open project.  I&#39;m guessing IntelliJ can&#39;t do this natively; are there any plug-ins out there to support this?

Thanks.

  [1]: http://www.indexyourfiles.com/

IntelliJ IDEA global search

I would like to use some  gcc warning switchs that aren&#39;t available in older gcc versions (eg. -Wtype-limits).

Is there an easy way to check the gcc version and only add those extra options if a recent gcc is used ?


Checking the gcc version in a Makefile?

So we are trying to deprecate some of our existing classes, and have started marking them as obsolete with the ObsoleteAttribute so they will stop being used.  The fact that using the KnownType attribute with a type that is marked with the Obsolete attribute and is causing a compiler warning is expected.  However, in our project we have warnings treated as errors so ignoring the warning isn&#39;t an option. Is there a compiler directive to suppress this warning? 

The following usage causes a compiler warning:

    ///ProductTemplateDataSet is marked with the Obsolete attribute
    [KnownType(typeof(ProductTemplateDataSet))]
    public class EntityCollectionBase : System.Data.DataSet
    {
    }


Edit:  I understand using compiler directives to ignore errors, but this compiler warning doesn&#39;t have a number.

How to ignore compiler warning when using Obsolete attribute on a class used with a KnownType attribute

I understand exactly why unused variable warnings occur. I don&#39;t want to suppress them in general, because they are incredibly useful in most cases. However, consider the following (contrived) code.

    NSError *error = nil;
    BOOL saved = [moc save:&amp;error];
    NSAssert1(saved, @&quot;Dude!!1! %@!!!&quot;, error);

Xcode reports that `saved` is an unused variable, when of course it isn&#39;t. I suspect this is because `NSAssert1` is a macro. The `NS_BLOCK_ASSERTIONS` macro is _not_ defined, so Objective C assertions are definitely enabled.

While it doesn&#39;t hurt anything, I find it untidy and annoying, and I want to suppress it, but I&#39;m not sure how to do so. Assigning the variable to itself gets rid of the compiler warning, but I&#39;d rather do it the &quot;right&quot; way if such a thing exists.

How can I get rid of an &quot;unused variable&quot; warning in Xcode?

When I try to compile the piece of code below, I get this warning:

`warning: suggest parentheses around assignment used as truth value`

Why does this happen? This is a rather common idiom, I believe. I even use something like it earlier on my code.

    struct PIDList* 
    getRecordForPID(struct PIDList* list, pid_t pid) {
    	while(list = list-&gt;next)
    		if (list-&gt;pid == pid)
    			return list;
    
    	return NULL;
    }


Compiler warning - suggest parentheses around assignment used as truth value

Under what situation is it possible for GCC to **not** throw an &quot;undefined reference&quot; link error message when trying to call made-up functions?

For example, a situation in which this C code is compiled and linked by GCC:

    void function()
    {
        made_up_function_name();
        return;
    }

...even though `made_up_function_name` is not present **anywhere** in the code (not headers, source files, declarations, nor any third party library).

Can that kind of code be accepted and compiled by GCC under certain conditions, without touching the actual code? If so, which?

Thanks.

EDIT: no previous declarations or mentions to `made_up_function_name` are present anywhere else. Meaning that a `grep -R` of the whole filesystem will **only** show that exact single line of code.

Can GCC not complain about undefined references?

The use case is simple. I got the source files that were created using Eclipse. So, there is a deep directory structure, where any Java class could be referring to another Java class in the same, child, sibling or parent folder. 

How do I compile this whole thing from the terminal using javac ?

Java: How can I compile an entire directory structure of code ?

I know running `javac file1.java` produces `file1.class` if `file1.java` is the only source file, then I can just say `java file1` to run it.

However, if I have 2 source files, `file1.java` and `file2.java`, then how  do I build the program?




How to compile multiple java source files in command line

I get this error when I compile my java program: 

    error: Class names, &#39;EnumDevices&#39;, are only accepted if annotation 
    processing is explicitly requested
    1 error

Here is the java code (I&#39;m running this on Ubuntu).

    import jcuda.CUDA;    
    import jcuda.driver.CUdevprop;    
    import jcuda.driver.types.CUdevice;
    
    public class EnumDevices {
    
      public static void main(String args[]) {
   		 CUDA cuda = new CUDA(true);    
    		int count = cuda.getDeviceCount();
       
    		System.out.println(&quot;Total number of devices: &quot; + count);
    
    		for (int i = 0; i &lt; count; i++) {
    
    		  CUdevice dev = cuda.getDevice(i);
    		  String name = cuda.getDeviceName(dev);
    		  System.out.println(&quot;Name: &quot; + name);
    		  int version[] = cuda.getDeviceComputeCapability(dev);
    
    		  System.out.println(&quot;Version: &quot; + 
    		      String.format(&quot;%d.%d&quot;, version[0], version[1]));
    		  CUdevprop prop = cuda.getDeviceProperties(dev);
    		  System.out.println(&quot;Clock rate: &quot; + prop.clockRate + &quot; MHz&quot;);
    		  System.out.println(&quot;Threads per block: &quot; + prop.maxThreadsPerBlock);
    		}
    	}
    }

Here is the javac command:

    javac -cp /home/manish.yadav/Desktop/JCuda-All-0.3.2-bin-linux-x86_64 EnumDevices

How do I compile this program?

javac error: Class names are only accepted if annotation processing is explicitly requested

I receive the following warning:

    [javac] build.xml:9: warning: &#39;includeantruntime&#39; was not set, 
    defaulting to build.sysclasspath=last; set to false for repeatable builds

What does this mean?



ant warning: &quot;&#39;includeantruntime&#39; was not set&quot;

I have installed java in my *CentOS release 5.5* machine using the command `yum install java`. But I am unable to compile a class using javac.

Do I need to install any other package? 

I have tried to locate the `javac` executable but i am unable to locate it.

`/usr/bin/java` is linked as follows:  
`/usr/bin/java` -&gt; `/etc/alternatives/java`  
`/etc/alternatives/java` -&gt; `/usr/lib/jvm/jre-1.6.0-openjdk.x86_64/bin/java`

I have seen the following output by `yum list installed |grep java`:

    java-1.6.0-openjdk.x86_64              1:1.6.0.0-1.16.b17.el5          installed
    tzdata-java.x86_64                     2011b-1.el5                     installed


Content Type	Original Author	Original Content on Stackoverflow
Question	Tommi	View Question on Stackoverflow
Solution 1 - Intellij Idea	CrazyCoder	View Answer on Stackoverflow

How to get Intellij Idea to display compilation warnings?

Intellij Idea Problem Overview

Intellij Idea Solutions

Solution 1 - Intellij Idea

Android Get Application's 'Home' Data Directory

C++ cross-compiler from Windows to Linux

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