How to Recompile With -Fpic

Recompile with -Xlint:unchecked for detail error in java

When you compile the code use this:

javac -Xlint:unchecked

Then you will see:

MyStack.java:6: warning: [unchecked] unchecked cast
    this.s = (T[])new Object[30];
                  ^
  required: T[]
  found:    Object[]
  where T is a type-variable:
     T extends Object declared in class MyStack\

MyStack.java:11: warning: [unchecked] unchecked cast
            T[] b = (T[])new Object[size*2];
                         ^
  required: T[]
  found:    Object[]
  where T is a type-variable:
    T extends Object declared in class MyStack
2 warnings

So bottom line, the problem is due to the creation of the generic type array. To solve this read this link: https://stackoverflow.com/a/530289/588532

How to recompile with -Xlint:deprecation

To answer my own question, you need to add the following to your project-level build.gradle file:

allprojects {
    ...

    gradle.projectsEvaluated {
        tasks.withType(JavaCompile) {
            options.compilerArgs << "-Xlint:deprecation"
        }
    }   
}

How do I compile with -Xlint:unchecked?

Specify it on the command line for javac:

javac -Xlint:unchecked

Or if you are using Ant modify your javac target

  <javac ...>
    <compilerarg value="-Xlint"/>
  </javac> 

If you are using Maven, configure this in the maven-compiler-plugin

<compilerArgument>-Xlint:unchecked</compilerArgument>

Activator - how to recompile with -Xlint:unchecked?

Add this to your build.sbt:

javacOptions += "-Xlint:unchecked"

How to recompile a single .cc file in a project built previously with CMake tool in Ubuntu 20.04?

For the time being, I am following this process. I opened two terminal windows, both pointing to the parent directory (i.e ~/Dev/ORB_SLAM3). Everytime I change something in the target file (here it is the ./Examples/Monocular/euroc_mono) I execture the ./build.sh command in one and run the file on the other. I can confirm that though the cmake command looks over all the files, it only builds the one that was changed. I guess this method works when one is using the CMake tool to build a C++ project in Linux.

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