GCC causes segfault for lambda-captured parameter pack

Question

I have the following SSCCE:

#include 
#include 

void foo(const std::string &a) {
  std::cout << a << std::endl         


        

Answer 1

I strongly suspect a g++ bug.

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Here are some notes:

• replacing std::string with any elementary type, e.g., int still does not work
• clang and VC++ will work just as intended
• not passing parameter pack by reference causes an internal compiler error with g++ 7.0.1 with the following output:

internal compiler error: in make_decl_rtl, at varasm.c:1304

...

Please submit a full bug report, with preprocessed source if appropriate.

Please include the complete backtrace with any bug report. See http://gcc.gnu.org/bugs.html for instructions.