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https://issues.apache.org/jira/browse/STDCXX-556?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Farid Zaripov updated STDCXX-556:
---------------------------------
Environment:
MSVC 7.1 with Service Pack 1
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 13.10.6030 for 80x86
Copyright (C) Microsoft Corporation 1984-2002. All rights reserved.
was:MSVC 7.1
Summary: [MSVC 7.1] Bug in implementation of the empty base
optimization (was: Bug in MSVC 7.1 implementation of the empty base
optimization)
> [MSVC 7.1] Bug in implementation of the empty base optimization
> ---------------------------------------------------------------
>
> Key: STDCXX-556
> URL: https://issues.apache.org/jira/browse/STDCXX-556
> Project: C++ Standard Library
> Issue Type: Bug
> Components: External
> Environment: MSVC 7.1 with Service Pack 1
> Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 13.10.6030 for 80x86
> Copyright (C) Microsoft Corporation 1984-2002. All rights reserved.
> Reporter: Farid Zaripov
>
> The test below exit with exitcode 1 due to bug in MSVC 7.1 implementation of
> the empty base optimization.
> -----------------------------
> #include <cstring>
> #include <cstdio>
> #include <new>
> class empty_base { };
> class base
> {
> public:
> base (int val) : __val (val) { }
> volatile int __val;
> };
> class derived1 : public base, public empty_base
> {
> public:
> derived1 (int val) : base (val), empty_base () { }
> };
> class derived2 : public base, public empty_base
> {
> public:
> derived2 (int val) : base (val) { }
> };
> template <class T>
> int foo (const int val, const char* name)
> {
> const char fill = '\xdc';
> char buf [sizeof (T) + 1];
> std::memset (buf, fill, sizeof (buf));
> T* t = new (buf) T (val);
> int ret = 0;
> if (fill != buf [sizeof (T)]) {
> ++ret;
> std::printf ("buf [sizeof (%s)] expected %d, got %d\n",
> name, int (fill), int (buf [sizeof (T)]));
> }
> if (val != t->__val) {
> ++ret;
> std::printf ("%s::__val expected %d, got %d\n",
> name, val, t->__val);
> }
> t->~T ();
> return ret;
> }
> int main(int, char**)
> {
> const int init = 0xcdcdcdcd;
> return foo <derived1> (init, "derived1")
> + foo <derived2> (init, "derived2");
> }
> -----------------------------
> The test output:
> -----------------------------
> buf [sizeof (derived1)] expected -36, got 0
> -----------------------------
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