[GNATS 23103] cp_gen_be: segfault in could_be_dependent_class_type

[jhsedg]

Customer bug ID

gnats/21715.C

Description

​This fully expanded Boost test aborts with a cp_gen_be config.
​The file is too big to put here.
​
​[ellen@lin1 gnats]$ rm core*;CPFE=$CPFEA eccp --c++17 --gnu_version 80100 -w 21715.C
​Segmentation fault (core dumped)
​eccp: front end returned an exit status of 139
​BFD: Warning: /home/ellen/tests/tests/gnats/core.453057 is truncated: expected core file size >= 301572096, found: 10
​260480.
​Cannot access memory at address 0x7ffff7ffe128
​Cannot access memory at address 0x7ffff7ffe120
​Failed to read a valid object file image from memory.
​Cannot access memory at address 0x7fffff7ff018
​-----> Context in _ZN3edg29could_be_dependent_class_typeEPNS_6a_typeE ():
​Return TRUE if the given type is dependent and might be a class type when
​instantiated (for a template parameter "T", this includes types such as "T",
​"T::X" and "C").
​*/
​{
​ tp = skip_typerefs(tp);
​-----> Abbreviated stack trace:
​could_be_dependent_class_type
​could_be_dependent_class_type
​-----> Segmentation fault crash signatures: bb6a344422f94f0a39eeb8af5866d110 from 75be4af12387a829876343ab7a82f181