For
#include <vector>
#include <string>
int main()
{
std::vector<std::string> x;
std::string s("hello");
return std::find(x.begin(), x.end(), s) - x.begin();
}
we now get "interesting" linker errors with trunk:
> g++-4.3 -o t t.C
/tmp/cc3Vq2t8.o: In function `main':
t.C:(.text+0x65): undefined reference to
`__gnu_cxx::__normal_iterator<std::basic_string<char, std::char_traits<char>,
std::allocator<char> >*, std::vector<std::basic_string<char,
std::char_traits<char>, std::allocator<char> >,
std::allocator<std::basic_string<char, std::char_traits<char>,
std::allocator<char> > > > >
std::find<__gnu_cxx::__normal_iterator<std::basic_string<char,
std::char_traits<char>, std::allocator<char> >*,
std::vector<std::basic_string<char, std::char_traits<char>,
std::allocator<char> >, std::allocator<std::basic_string<char,
std::char_traits<char>, std::allocator<char> > > > >, std::basic_string<char,
std::char_traits<char>, std::allocator<char> >
>(__gnu_cxx::__normal_iterator<std::basic_string<char, std::char_traits<char>,
std::allocator<char> >*, std::vector<std::basic_string<char,
std::char_traits<char>, std::allocator<char> >,
std::allocator<std::basic_string<char, std::char_traits<char>,
std::allocator<char> > > > >,
__gnu_cxx::__normal_iterator<std::basic_string<char, std::char_traits<char>,
std::allocator<char> >*, std::vector<std::basic_string<char,
std::char_traits<char>, std::allocator<char> >,
std::allocator<std::basic_string<char, std::char_traits<char>,
std::allocator<char> > > > >, std::basic_string<char, std::char_traits<char>,
std::allocator<char> > const&)'
collect2: ld returned 1 exit status
where it is not exactly obvious that just the #include <algorithm> is missing
here. With 4.2 and 4.2 at least the program linked fine (I guess algorithm
was pulled in anyway).
Can we improve this situation by not making algorithm half-way available so
we can raise a meaningful error instead?
--
Summary: [4.3 Regression] Confusing error message with missing
#include <algorithm>
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Keywords: accepts-invalid, diagnostic
Severity: normal
Priority: P3
Component: libstdc++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: rguenth at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34105
