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List:       gcc-bugs
Subject:    Missing warning
From:       Carlo Wood <carlo () runaway ! xs4all ! nl>
Date:       1999-09-25 23:58:57
[Download RAW message or body]

Hi, while implementing a singleton class, I ran into the
following weirdness:

The following code snippet doesn't give the warning that
one would expect:

-----------------------------------------------------------
template<class T> class B {
  B(void);
public:
  static void create(void) { new T; }
};

class A : public B<A> {
};

void foo(void)
{
  A::create();
}
-----------------------------------------------------------

Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66/specs
gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
 /usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66/cpp -lang-c++ -v -undef -D__GNUC__=2 \
-D__GNUG__=2 -D__cplusplus -D__GNUC_MINOR__=91 -D__ELF__ -Dunix -Di386 -D__i386__ \
-Dlinux -D__ELF__ -D__unix__ -D__i386__ -D__i386__ -D__linux__ -D__unix -D__i386 \
-D__linux -Asystem(posix) -D__EXCEPTIONS -Asystem(unix) -Acpu(i386) -Amachine(i386) \
-Di386 -D__i386 -D__i386__ singleton.cc /tmp/ccr2vFEd.ii GNU CPP version egcs-2.91.66 \
19990314/Linux (egcs-1.1.2 release) (i386 Linux/ELF) #include "..." search starts \
here: #include <...> search starts here:
 /usr/include/g++-2
 /usr/local/include
 /usr/i386-redhat-linux/include
 /usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66/include
 /usr/include
End of search list.
 /usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66/cc1plus /tmp/ccr2vFEd.ii -quiet \
-dumpbase singleton.cc -version -o /tmp/ccUwUNmg.s GNU C++ version egcs-2.91.66 \
19990314/Linux (egcs-1.1.2 release) (i386-redhat-linux) compiled by GNU C version \
                egcs-2.91.66 19990314/Linux (egcs-1.1.2 release).
singleton.cc: In method `A::A()':
singleton.cc:4: confused by earlier errors, bailing out


The correct warning would be:

singleton.cc: In method `A::A()':
singleton.cc:2: `B<A>::B<A>()' is private
singleton.cc:4: within this context

-- 
 Carlo Wood  <carlo@runaway.xs4all.nl>


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