http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57588
Bug ID: 57588
Summary: [C++11][constexpr] static constexpr in class fails to
link
Product: gcc
Version: 4.7.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mattyclarkson at gmail dot com
The following code, links in optimisation modes but not others:
#include <iostream>
///////////////////////////////////////////////////////////////////////////////
class Literal {
private:
Literal() = delete;
Literal(const Literal&) = delete;
Literal(Literal&&) = delete;
Literal& operator=(const Literal&) = delete;
Literal& operator=(Literal&&) = delete;
~Literal() = default;
public:
constexpr Literal(const int i);
public:
constexpr operator int() const;
private:
int int_;
};
constexpr Literal::Literal(const int i) : int_(i) {};
constexpr Literal::operator int() const {
return int_;
}
///////////////////////////////////////////////////////////////////////////////
class Test {
private:
Test(const Test&) = delete;
Test(Test&&) = delete;
Test& operator=(const Test&) = delete;
Test& operator=(Test&&) = delete;
~Test() = default;
public:
static constexpr const Literal kLiteral = Literal(99);
public:
constexpr Test();
public:
constexpr operator int() const;
private:
int int_;
};
constexpr Test::Test() : int_(kLiteral) {};
constexpr Test::operator int() const {
return int_;
}
///////////////////////////////////////////////////////////////////////////////
int main() {
std::cout << Literal(15) << std::endl;
std::cout << Test() << std::endl;
return 0;
}
Has some odd compilation on my machine:
[matt test] uname -a
Linux office.acer-m5810 3.8.13-100.fc17.x86_64 #1 SMP Mon May 13 13:36:17 UTC
2013 x86_64 x86_64 x86_64 GNU/Linux
[matt test] g++ -std=c++11 test.cpp -o test -O0 -g && ./test
/tmp/ccZtV9ku.o: In function `Test::Test()':
/home/matt/test/test.cpp:51: undefined reference to `Test::kLiteral'
collect2: error: ld returned 1 exit status
[matt test] g++ -std=c++11 test.cpp -o test -O1 -g && ./test
15
99
[matt test] g++ -std=c++11 test.cpp -o test -O2 -g && ./test
15
99
[matt test] g++ -std=c++11 test.cpp -o test -O3 -g && ./test
15
99
However, on gcc.godbolt.org and ideone.com I cannot get the same compilation
error with 4.7.2. I'm assuming I'm not being a donkey and doing something
against the standard? :/
If I can help with any debugging, please ask.
