<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - `ninja` does not rebuild if sources change"
   href="https://bugs.llvm.org/show_bug.cgi?id=40668">40668</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>`ninja` does not rebuild if sources change
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>lldb
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Macintosh
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>All Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>lldb-dev@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>thelastmammoth@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>I'm on OSX and follow the steps here: <a href="https://lldb.llvm.org/build.html">https://lldb.llvm.org/build.html</a>

```
git clone <a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a> 
cd llvm-project 
mkdir build 
cd build
cmake ../llvm -G Ninja -DLLVM_ENABLE_PROJECTS='clang;lldb' 
ninja lldb
```

this works, but then if I change sources [1], nothing is rebuilt after `ninja
lldb`, which completes almost immediately:

```
ninja lldb
[1/1] Python script sym-linking LLDB Python API
```


## note:
here's the change I was trying to make:
* trying to apply this patch <a href="https://stackoverflow.com/a/32724035/1426932">https://stackoverflow.com/a/32724035/1426932</a> to
fix this bug
<a href="https://stackoverflow.com/questions/26829119/how-to-make-lldb-ignore-exc-bad-access-exception">https://stackoverflow.com/questions/26829119/how-to-make-lldb-ignore-exc-bad-access-exception</a>

if i modify llvm-project/lldb/tools/debugserver/source/MacOSX/MachTask.mm
no recompilation happens; ditto with
`source/Plugins/Process/Darwin/MachException.cpp`</pre>
        </div>
      </p>


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