commit f803a44ed56f051b7d5acb7746c15ed837c6747b
author Azat Khuzhin <a3at.mail@gmail.com> Thu Dec 17 16:19:50 2020 -0500
committer Copybara-Service <copybara-worker@google.com> Sun Jan 03 12:50:31 2021 -0800
tree a092e7bc18346dc00a3dca66eba44f0c50ef6ce0
parent 78848ccdd5f2bf2a33c3f9400b31aa9cea9588c4

[libc++] Fix extern C for __sanitizer_annotate_contiguous_container() (for gcc)

gcc supports it only at the beginning:

    $ g++ -o /dev/null -c /tmp/test_extern.cpp
    $ cat /tmp/test_extern.cpp
    extern "C" __attribute__ ((__visibility__("default"))) int foo();

Otherwise:

    $ g++ -o /dev/null -c /tmp/test_extern.cpp
    /tmp/test_extern.cpp:1:52: error: expected unqualified-id before string constant
        1 | __attribute__ ((__visibility__("default"))) extern "C" int foo();
          |                                                    ^~~
    $ cat /tmp/test_extern.cpp
    __attribute__ ((__visibility__("default"))) extern "C" int foo();

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D93316

GitOrigin-RevId: 6340f890bb86b6ec1e72047d4c4560ee0dfe6d90