bug in g++ error output

[Gabriel Dos Reis]

Tom Tromey <tromey@cygnus.com> writes:

| I'm using a relatively new cvs gcc.
| 
| I have code that looks like this:
| 
|   try
|     {
|       _Jv_JNI_LocalFrame *frame
| 	= (_Jv_JNI_LocalFrame *) _Jv_Malloc (sizeof (_Jv_JNI_LocalFrame)
| 					     + size * sizeof (jobject));
|     }
|   catch (jthrowable t)
|     {
|       env->ex = t;
|       return JNI_ERR;
|     }
| 
|   frame->marker = true;
| 
| The bug here is that `frame' is declared inside the `try', but used
| after the `try'.  Oops.
| 
| g++ gives a strange message in this case:
| 
| ../../../libgcj/libjava/jni.cc: In function `jint
| ../../../libgcj/libjava/jni.cc: _Jv_JNI_EnsureLocalCapacity (JNIEnv *,
| ../../../libgcj/libjava/jni.cc: __java_int)':
| ../../../libgcj/libjava/jni.cc:188: warning: unused variable `
| ../../../libgcj/libjava/jni.cc:188: warning: _Jv_JNI_LocalFrame *frame'
| ../../../libgcj/libjava/jni.cc:197: `frame' undeclared (first use this
| ../../../libgcj/libjava/jni.cc:197: function)
| ../../../libgcj/libjava/jni.cc:197: (Each undeclared identifier is
| ../../../libgcj/libjava/jni.cc:197: reported only once
| ../../../libgcj/libjava/jni.cc:197: for each function it appears in.)
| 
| Look at the two lines that say `188: warning: '.  I find this strange
| because g++ has apparently chosen to word wrap the message in a way
| that is hard to read.  I think it would be better to format those
| lines like this:
| 
| ../../../libgcj/libjava/jni.cc:188: warning: unused variable
| ../../../libgcj/libjava/jni.cc:188: `_Jv_JNI_LocalFrame *frame'

Sounds reasonable.  Working on a patch.

-- Gaby
gdr@codesourcery.com				CodeSourcery, LLC