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Date: Thu, 26 Feb 2004 19:00:00 -0000
From: Joel Brobecker <brobecker@gnat.com>
To: Elena Zannoni <ezannoni@redhat.com>,
	gdb-patches@sources.redhat.com
Subject: Re: [RFA/dwarf-2] Fix for the null record problem
Message-ID: <20040226190011.GE1154@gnat.com>
References: <20040219140145.GB804@gnat.com> <16437.11835.435941.553479@localhost.redhat.com> <20040226023108.GF3425@gnat.com> <20040226032743.GA30615@nevyn.them.org>
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> I'd like to have the empty struct test anyway.  Remember to add a
> variable of that type if you add a type to class2.cc; or newer GCCs
> will just elide the type.

Would the following patch be ok to apply?

2004-02-26  J. Brobecker  <brobecker@gnat.com>

        * gdb.cp/class2.cc (empty): New class.
        (refer): New function.
        (main): Declare an object of type empty and use it.
        * gdb.cp/class2.exp: Print the value of an object of type empty.

Tested on x86-linux.

-- 
Joel

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Index: class2.cc
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.cp/class2.cc,v
retrieving revision 1.2
diff -u -r1.2 class2.cc
--- class2.cc	11 Feb 2004 14:01:25 -0000	1.2
+++ class2.cc	26 Feb 2004 18:51:32 -0000
@@ -48,10 +48,19 @@
   ;
 }
 
+struct empty {};
+
+// Stop the compiler from optimizing away data.
+void refer (empty *)
+{
+  ;
+}
+
 int main (void)
 {
   A alpha, *aap, *abp;
   B beta, *bbp;
+  empty e;
 
   alpha.a1 = 100;
   beta.a1 = 200; beta.b1 = 201; beta.b2 = 202;
@@ -59,6 +68,7 @@
   aap = &alpha; refer (aap);
   abp = &beta;  refer (abp);
   bbp = &beta;  refer (bbp);
+  refer (&e);
 
   return 0;  // marker return 0
 } // marker close brace
Index: class2.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.cp/class2.exp,v
retrieving revision 1.1
diff -u -r1.1 class2.exp
--- class2.exp	25 Nov 2003 15:01:31 -0000	1.1
+++ class2.exp	26 Feb 2004 18:51:32 -0000
@@ -113,3 +113,7 @@
 gdb_test "print * (B *) abp" \
     "= {.*a1 = 200.*b1 = 201.*b2 = 202}" \
     "print * (B *) abp at marker return 0"
+
+# Printing the value of an object containing no data fields:
+
+gdb_test "p e" "= {<No data fields>}" "print object with no data fields"

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