[Bug sanitizer/77982] deadlock in asan thread initialization/interception.

[pawel_sikora at zoho dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77982

--- Comment #3 from Pawel Sikora <pawel_sikora at zoho dot com> ---
(In reply to Kostya Serebryany from comment #2)
> Is -flto important here?
> Does this happen with clang? (does not happen for me)
> Does this happen if you use statically linked asan (-static-libasan)?

ad1). lto isn't important.
ad2). with static libasan testcase works.
ad3). i can't verify with clang on fedora 24 due to linking error:

clang++ -fuse-ld=gold -g2 -O -fsanitize=address s.cpp -shared -o s.so -fPIC
clang++ -fuse-ld=gold -g2 -O -fsanitize=address m.cpp -o m
/usr/bin/ld.gold: error: cannot open
/usr/bin/../lib64/clang/3.8.0/lib/linux/libclang_rt.asan-x86_64.a: No such file
or directory
/usr/bin/ld.gold: error: cannot open
/usr/bin/../lib64/clang/3.8.0/lib/linux/libclang_rt.asan_cxx-x86_64.a: No such
file or directory
m.cpp:5: error: undefined reference to '__asan_init'
m.cpp:5: error: undefined reference to '__asan_version_mismatch_check_v6'
m.cpp:5: error: undefined reference to '__asan_register_globals'
m.cpp:5: error: undefined reference to '__asan_unregister_globals'