Issue #5851 has been updated by Vit Ondruch. Yes, it fixes the SEGV it seems. Thank you! Could you backport it for 1.9.3? Should I open new ticket for backport? ---------------------------------------- Bug #5851: make check fails when compiling with GCC 4.7 - *** longjmp causes uninitialized stack frame *** https://bugs.ruby-lang.org/issues/5851 Author: Vit Ondruch Status: Open Priority: Normal Assignee: Category: Target version: ruby -v: ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-linux] I am experiencing strange test error [1] when compiling Ruby 1.9.3-p0/1.9.3-p19/2.0.0 rev 34217 with GCC 4.7 in Fedora Rawhide [2]. Everything worked just fine with GCC 4.6. Vit [1] https://gist.github.com/1564328 [2] http://koji.fedoraproject.org/koji/taskinfo?taskID=3624339 -- http://bugs.ruby-lang.org/