[cfe-users] Template error without instantiation?

[Handa, Ramneek]

Hey folks,
  Can you help check which compiler behaves correctly here? To my
untrained mind it seems to be a clang issue but seems too basic to have
been missed unintentionally?

Regards,
Ramneek

x- start -x
class A {};

class B {};

void myfun(A& myexp) {
}

template <typename T>
void mytest(const B &value)
{
   myfun(A(value));
}

template <typename T>
void mytest(const T &value)
{
   myfun(A(value));
}
x-end -x


*output from gcc:*
> gcc --version
gcc (GCC) 4.4.3

> gcc -c ~/test.cpp
Compiles!!

*output from clang:*
> clang++ --version
clang version 3.3 (2545b1d99942080bac4a74cda92c620123d0d6e9)
(2ff97832e593926ea8dbdd5fc5bcf367475638a9)
Target: x86_64-unknown-linux-gnu
Thread model: posix

clang++ ~/test.cpp
test.cpp:12:10: error: no matching conversion for functional-style cast
from 'const B' to 'A'
   myfun(A(value));
         ^~~~~~~
test.cpp:2:7: note: candidate constructor (the implicit copy
constructor) not viable: no known conversion from 'const B' to 'const A'
for 1st argument
class A {};
      ^
test.cpp:2:7: note: candidate constructor (the implicit default
constructor) not viable: requires 0 arguments, but 1 was provided
test.cpp:18:4: error: no matching function for call to 'myfun'
   myfun(A(value));
   ^~~~~
test.cpp:6:6: note: candidate function not viable: expects an l-value
for 1st argument
void myfun(A& myexp) {
     ^
2 errors generated.

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