[Bug c++/16269] New: g++ doesn't reuse stack space

["mrs at apple dot com" <gcc-bugzilla at gcc dot gnu dot org>]

There used to be a test case in dejagnu that tested for g++'s ability to reuse stack space.  That 
testcase was g++.old-deja/g++.mike/p7325.C:

// { dg-do run { xfail *-*-* } }
// I hate this type of test case.  I'm not sure how to code it better.
// See the PR for what this tests.
// prms-id: 7325

int fail = 0;

struct A {
  int i;
  static const A* match_this;
  static const A* match_arg;
  A(): i(7) {
    if (match_this)
      if (match_this != this)
        fail = 1;
  }
  A* get_this() { return this; }
  A& operator = (const A& o) {
    if (match_this)
      if (match_this != this)
        fail = 1;
    if (match_arg)
      if (match_arg != &o)
        fail = 1;
    match_arg = &o;
    return *this;
  }
};

const A* A::match_this;
const A* A::match_arg;
A a;

A foo() { return a; }
void f ()
{
  A a;
  A::match_this = &a;
  a = foo ();
  a = foo ();
  A::match_this = 0;
}

void g ()
{
  A::match_this = A().get_this();
  A();
  A();
  A::match_this = 0;
}

int main() {
  f();
  g();
  return fail;
}

This used to pass, but someone broke it.  Redhat's devo should be able to tell us when it passed 
by checking the add time of the testcase.  A search should tell us who broke it and when.

More state can be found in 7325 in Redhat's old bug database.

I'm reporting this, as that testcase, likely the only one of its type was recently removed from the 
testsuite, and the failure visibility that the test case brough, gone.

-- 
           Summary: g++ doesn't reuse stack space
           Product: gcc
           Version: 3.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: mrs at apple dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: powerpc-apple-darwin6.3
  GCC host triplet: powerpc-apple-darwin6.3
GCC target triplet: powerpc-apple-darwin6.3


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16269