https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100538
Bug ID: 100538
Summary: g++ miscompile / ICE with variadic member function
pointer argument list
Product: gcc
Version: 11.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: profclonk at gmail dot com
Target Milestone: ---
Created attachment 50792
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50792&action=edit
Source code triggering the GCC bug
Dear GCC team,
the attached code passes member function pointers to a template function. The
code should print "bar" once, but doesn't (miscompile). When commenting out
line 19 and enabling line 22 I get an internal compiler error:
<source>: In instantiation of 'void foo(MemPtrList<SubRefs ...>) [with
SubPtrTypes = int; SubPtrTypes X::* ...SubRefs = {&X::a}]':
<source>:26:6: required from here
<source>:22:9: internal compiler error: in finish_expr_stmt, at
cp/semantics.c:860
22 | (bar<SubPtrTypes> (), ...);
| ^
0x1780bf9 internal_error(char const*, ...)
???:0
0x677e40 fancy_abort(char const*, int, char const*)
???:0
0x80362c finish_expr_stmt(tree_node*)
???:0
0x7dcec3 instantiate_decl(tree_node*, bool, bool)
???:0
0x7f7aab instantiate_pending_templates(int)
???:0
0x708f4d c_parse_final_cleanups()
???:0
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
ASM generation compiler returned: 1
The error happens on x86-64 Windows 10 when using MinGW-w64 via MSYS2, and also
on Compiler Explorer ( https://godbolt.org/z/vhPqKaqeW ,
https://godbolt.org/z/feP5GPdP4 ). It works fine in Clang.
Thanks,
Niklas
