[Bug c++/67961] New: Incorrect type of meber of struct in error message

[Bug c++/67961] New: Incorrect type of meber of struct in error message

[other+gcc at meresinski dot eu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67961

            Bug ID: 67961
           Summary: Incorrect type of meber of struct in error message
           Product: gcc
           Version: 5.2.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: other+gcc at meresinski dot eu
  Target Milestone: ---

Created attachment 36506
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36506&action=edit
Test case

Compiling following code produces incorrect error message:

#include <cstdint>

void foo(std::size_t &f) {
        f = 5;
}

struct A {
        uint32_t val;
};

int main() {
        A a, *aptr = &a;
        foo(aptr->val);
        return 0;
}

g++ --std=c++11 foo.cpp gives error message:
error: invalid initialization of non-const reference of type ‘std::size_t& {aka
long unsigned int&}’ from an rvalue of type ‘std::size_t {aka long unsigned
int}’
  foo(aptr->val);
            ^
where type of that rvalue variable is uint32_t not std::size_t. I think I
should add that system is 64bit so std::size_t has 64 bits.
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Subject: [Bug tree-optimization/67920] [6 Regression] wrong code with -O3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idg920

Ilya Enkovich <ienkovich at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|---                         |FIXED

--- Comment #10 from Ilya Enkovich <ienkovich at gcc dot gnu.org> ---
(In reply to James Almer from comment #9)
> Looks like it did. Thanks.

Fixed then

[Bug c++/67961] Incorrect type of meber of struct in error message

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67961

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The diagnostic is correct.

Trying to pass uint32_t to a function taking size_t causes a conversion,
creating a temporary (i.e. rvalue) size_t, but a non-const reference cannot
bind to a temporary.

[Bug c++/67961] Incorrect type of meber of struct in error message

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67961

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to other+gcc from comment #0)
> where type of that rvalue variable is uint32_t not std::size_t.

There is no rvalue of type uint32_t. The type of the **lvalue** is uint32_t.

The rvalue is the temporary that gets created implicitly, which is of type
size_t.


FWIW clang doesn't mention rvalues, it just says there is no matching function
for the call because ...

prog.cc:4:6: note: candidate function not viable: no known conversion from
'std::uint32_t' (aka 'unsigned int') to 'std::size_t &' (aka 'unsigned long &')
for 1st argument

[Bug c++/67961] Incorrect type of meber of struct in error message

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67961

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Closing then.