[GCC] C++ program calling std::getline() crashes with certain compilation flags

[TANNHAUSER Falk <Falk.Tannhauser@crf.canon.fr>]

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> Bonus points if you can reduce this testcase further, see
> https://gcc.gnu.org/wiki/A_guide_to_testcase_reduction
> for how to take the preprocessed output and automatically
> reduce it to a much smaller file.

I attach the output of
  ```
  creduce checki.sh test_getline.i
  ```
where checki.sh is attached too and test_getline.i was obtained trough
  ```
  g++ -w -std=c++98 -O0 -E -P test_getline.cxx > test_getline.i
  ```
Note that passing -O1 instead of -O0 doesn't change the pre-processed output,
while replacing -std=c++98 by -std=gnu++98 triggers substantial changes.

Falk

[-- Attachment #2: test_getline.i --]
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namespace std { template < typename > class allocator; template < class > struct char_traits; template < typename b, typename = char_traits< b >, typename = allocator< b > > class basic_string; typedef basic_string< char > c; template < typename b, typename = char_traits< b > > class basic_istream; typedef basic_istream< char > d; template < typename > class allocator {}; template < typename b, typename, typename e > class basic_string {   struct _Rep {     b *_M_refdata();   };   struct f {     f(b *g, e) : h(g) {}     b *h;   } i;   _Rep &j() {}  public:   basic_string() : i(j()._M_refdata(), e()) {} }; template < typename b, typename k, typename e > basic_istream< b, k > &getline(basic_istream< b, k > &,                                basic_string< b, k, e > &); class ios_base { public:   class Init {   public:     Init();   }; }; extern d cin; ios_base::Init l; }
 main() {   std::c a;   getline(std::cin, a); }

[-- Attachment #3: checki.sh --]
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g++ -w -std=c++98 -O0 test_getline.i -o test_getline && echo a | ./test_getline
if ! test "$?" = "0" ; then exit 1 ; fi
g++ -w -std=c++98 -O1 test_getline.i -o test_getline && echo a | ./test_getline
if test "$?" = "0" ; then exit 1 ; fi
exit 0

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