r275309 - in /branches/gcc-7-branch/libstdc++-v...

redi@gcc.gnu.org redi@gcc.gnu.org
Mon Sep 2 11:10:00 GMT 2019

Author: redi
Date: Mon Sep  2 11:10:00 2019
New Revision: 275309

URL: https://gcc.gnu.org/viewcvs?rev=275309&root=gcc&view=rev
PR libstdc++/51333 Define recursive_init_error constructor non-inline

The recursive_init_error class is defined in a header, with an inline
constructor, but the definition of the vtable and destructor are not
exported from the shared library. With -fkeep-inline-functions the
constructor gets emitted in user code, and requires the (non-exported)
vtable. This fails to link.

As far as I can tell, the recursive_init_error class definition was
moved into <cxxabi.h> so it could be documented with Doxygen, not for
any technical reason. But now it's there (and documented), somebody
could be relying on it, by catching that type and possibly performing
derived-to-base conversions to the std::exception base class. So the
conservative fix is to leave the class definition in the header but make
the constructor non-inline. This still allows the type to be caught and
still defines its base class.

Backport from mainline
2019-07-29  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/51333
	* libsupc++/cxxabi.h (__gnu_cxx::recursive_init_error): Do not define
	constructor inline.
	* libsupc++/guard_error.cc (__gnu_cxx::recursive_init_error): Define
	* testsuite/18_support/51333.cc: New test.


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