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From: "sandipan.mohanty at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/100134] [modules] ICE when using a vector in a module
Date: Thu, 10 Mar 2022 14:49:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100134

Sandipan Mohanty <sandipan.mohanty at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sandipan.mohanty at gmail =
dot com

--- Comment #2 from Sandipan Mohanty <sandipan.mohanty at gmail dot com> ---
I was about to report something very similar, so I will add my observations=
 to
this report:

(i) I have reproduced this after pulling and rebuilding today (10 March 202=
2)
from gcc git repository. The commit id for my testing version is
3357878ef56d1e47666fc697cfd7cb5cd9c1dfc9.

(ii) The ICE happens even if you don't create a vector instance:

// minimal code to reproduce
module;
import <vector>;
export module SomeModule;

struct SomeClass {
    using iterator =3D std::vector<int>::iterator;
};
// end code

Compilation steps are as in the original report. In order to avoid possible
interference from other header units, I performed each of my tests by first
removing gcm.cache/.

$ rm -rf gcm.cache
$ g++ -std=3Dc++20 -fmodules-ts -xc++-system-header vector
$ g++ -std=3Dc++20 -fmodules-ts -c module_ICE_1.cc -freport-bug


(iii) One can change vector to deque, list, forward_list or a set, and still
have the same error. Changing the container to std::array does not cause th=
is
specific ICE.

(iv) Replacing the container with std::map<int, int> still has the same err=
or,
but std::unordered_map<int, int> does not! With an unordered_set, one can g=
et
further and create objects in the module.=