[Bug c++/98983] New: SEGV during C++17 variadic template instantiation

[alison@she-devel.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98983

            Bug ID: 98983
           Summary: SEGV during C++17 variadic template instantiation
           Product: gcc
           Version: 10.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: alison@she-devel.com
  Target Milestone: ---

The code that causes the crash relies on GCC's typeclass.h and the folly
project's StaticTracepoint.h, which implements support for Linux BPF userspace
static tracing.   I will attach the requested preprocessor output.   The code
also crashes clang++.   I do not work for F******k: this is my personal weekend
hack project. 

$ make arg_classifier_lib_test
/usr/bin/g++ -std=c++17 -pthread -ggdb -Wall -Wextra -g -O0 -fno-inline
-fsanitize=address,undefined
-I/home/alison/gitsrc/googletest/googletest/include -ggdb -g -fsanitize=address
-L/home/alison/gitsrc/googletest/googletest/make -lpthread
-I/home/alison/gitsrc/gcc -I/home/alison/gitsrc/folly
/home/alison/gitsrc/googletest/googletest/make/libgtest.a
/home/alison/gitsrc/googletest/googletest/make/libgtest_main.a
/home/alison/gitsrc/fbcode-install/folly/lib/libfolly.a
/home/alison/gitsrc/fbcode-install/folly/lib/libfolly_test_util.a
arg_classifier_lib_test.cc -o arg_classifier_lib_test
In file included from
/home/alison/gitsrc/folly/folly/tracing/StaticTracepoint.h:22,
                 from arg_classifier.h:8,
                 from arg_classifier_lib_test.cc:12:
arg_classifier.h: In instantiation of ‘bool
arg_classify::maybe_insert_folly_sdt_probe(const char*, const char*, T, Pars
...) [with T = int; Pars = {int}]’:
arg_classifier_lib_test.cc:194:3:   required from here
/home/alison/gitsrc/folly/folly/tracing/StaticTracepoint-ELFx86.h:53:65:
internal compiler error: Segmentation fault