[Bug 1643538] [NEW] gcc 5 copy list initialization creates undefined reference

[sobczyk]

Public bug reported:


g++ > 5.1
introduced a regression

Following code compiled with g++ -std=c++11

#include <memory>

struct HelperArgs
{
	std::shared_ptr<bool> dummy;
};

static void freefunc(HelperArgs aa = {}) { };			// doesn't work
//static void freefunc(HelperArgs aa = HelperArgs{}) { };	// works

int main()
{
	freefunc();
	return 0;
}

creates:
g++ -std=c++11 test.cpp
/tmp/ccDj6FO4.o: In function `main':
test.cpp:(.text+0xc7): undefined reference to `std::shared_ptr<bool>::shared_ptr()'
collect2: error: ld returned 1 exit status

all clang++ compile this code fine

** Affects: gcc-5 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1643538

Title:
  gcc 5 copy list initialization creates undefined reference

Status in gcc-5 package in Ubuntu:
  New

Bug description:
  
  g++ > 5.1
  introduced a regression

  Following code compiled with g++ -std=c++11

  #include <memory>

  struct HelperArgs
  {
  	std::shared_ptr<bool> dummy;
  };

  static void freefunc(HelperArgs aa = {}) { };			// doesn't work
  //static void freefunc(HelperArgs aa = HelperArgs{}) { };	// works

  int main()
  {
  	freefunc();
  	return 0;
  }

  creates:
  g++ -std=c++11 test.cpp
  /tmp/ccDj6FO4.o: In function `main':
  test.cpp:(.text+0xc7): undefined reference to `std::shared_ptr<bool>::shared_ptr()'
  collect2: error: ld returned 1 exit status

  all clang++ compile this code fine

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