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<h3 class="section">Java Exceptions</h3>
<p>The Java language uses a slightly different exception handling model
from C++. Normally, GNU C++ will automatically detect when you are
writing C++ code that uses Java exceptions, and handle them
appropriately. However, if C++ code only needs to execute destructors
when Java exceptions are thrown through it, GCC will guess incorrectly.
Sample problematic code is:
<pre class="smallexample"> struct S { ~S(); };
extern void bar(); // is written in Java, and may throw exceptions
void foo()
{
S s;
bar();
}
</pre>
<p>The usual effect of an incorrect guess is a link failure, complaining of
a missing routine called <code>__gxx_personality_v0</code>.
<p>You can inform the compiler that Java exceptions are to be used in a
translation unit, irrespective of what it might think, by writing
<code>#pragma GCC java_exceptions</code> at the head of the file. This
<code>#pragma</code> must appear before any functions that throw or catch
exceptions, or run destructors when exceptions are thrown through them.
<p>You cannot mix Java and C++ exceptions in the same translation unit. It
is believed to be safe to throw a C++ exception from one file through
another file compiled for the Java exception model, or vice versa, but
there may be bugs in this area.
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