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From: "michal at sawicz dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug pch/106799] New: `forming offset [32, 36] is out of the bounds`
 error with precompiled headers
Date: Thu, 01 Sep 2022 08:47:46 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: pch
X-Bugzilla-Version: 12.2.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: michal at sawicz dot net
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106799

            Bug ID: 106799
           Summary: `forming offset [32, 36] is out of the bounds` error
                    with precompiled headers
           Product: gcc
           Version: 12.2.0
               URL: https://bugs.launchpad.net/ubuntu/+source/gcc-12/+bug/
                    1983852
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: pch
          Assignee: unassigned at gcc dot gnu.org
          Reporter: michal at sawicz dot net
  Target Milestone: ---
              Host: x86_64
            Target: x86_64
             Build: x86_64

Created attachment 53527
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D53527&action=3Dedit
Header and source files needed to reproduce

NB: googletest required to reproduce.

Given the three minimal source files and the commands:

```
/usr/bin/g++-12 -I/usr/src/googletest/googlemock/include -O2 -std=3Dc++20
-include cmake_pch.hxx -include cmake_pch.hxx -x c++-header -o
cmake_pch.hxx.gch -c cmake_pch.hxx.cxx
/usr/bin/g++-12 -I/usr/src/googletest/googlemock/include -O2 -std=3Dc++20
-include cmake_pch.hxx -c tmp.cpp
```

gcc-12 errors out with the following:

```
In file included from /usr/include/c++/12/ios:40,=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
                 from /usr/include/c++/12/ostream:38,=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
                 from /usr/include/c++/12/bits/unique_ptr.h:41,=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20
                 from /usr/include/c++/12/memory:76,=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
                 from
/usr/src/googletest/googlemock/include/gmock/gmock-actions.h:139,=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20
                 from /usr/src/googletest/googlemock/include/gmock/gmock.h:=
56,=20=20
                 from ./cmake_pch.hxx:5,=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
                 from <command-line>:=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20
In static member function =E2=80=98static constexpr std::char_traits<char>:=
:char_type*
std::char_traits<char>::copy(char_type*, const char_type*, std::size_t)=E2=
=80=99,
    inlined from =E2=80=98constexpr std::__cxx11::basic_string<_CharT, _Tra=
its,
_Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&)
[with _CharT =3D char; _Traits =3D std::char_traits<char>;
 _Alloc =3D std::allocator<char>]=E2=80=99 at
/usr/include/c++/12/bits/basic_string.h:675:23,
    inlined from =E2=80=98constexpr std::__cxx11::basic_string<_CharT, _Tra=
its,
_Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits,
_Allocator>&&, const _CharT*) [with _CharT =3D char; _Traits =3D char
_traits<char>; _Alloc =3D allocator<char>]=E2=80=99 at
/usr/include/c++/12/bits/basic_string.h:3555:43,
    inlined from =E2=80=98testing::internal::TypedExpectation<F>&
testing::internal::MockSpec<F>::InternalExpectedAt(const char*, int, const
char*, const char*) [with F =3D void(bool)]=E2=80=99 at /usr/src/googletest=
/goog
lemock/include/gmock/gmock-spec-builders.h:1278:23,=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
    inlined from =E2=80=98virtual void Test_tests_Test::TestBody()=E2=80=99=
 at tmp.cpp:20:5:=20=20=20=20
/usr/include/c++/12/bits/char_traits.h:431:56: warning: =E2=80=98void*
__builtin_memcpy(void*, const void*, long unsigned int)=E2=80=99 writing 19=
 bytes into
a region of size 16 overflows the destination [-Wstringop-ove
rflow=3D]=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20
  431 |         return static_cast<char_type*>(__builtin_memcpy(__s1, __s2,
__n));
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20
In file included from
/usr/src/googletest/googlemock/include/gmock/gmock-function-mocker.h:43,=20=
=20=20=20=20=20=20
                 from /usr/src/googletest/googlemock/include/gmock/gmock.h:=
58:=20=20
/usr/src/googletest/googlemock/include/gmock/gmock-spec-builders.h: In memb=
er
function =E2=80=98virtual void Test_tests_Test::TestBody()=E2=80=99:
/usr/src/googletest/googlemock/include/gmock/gmock-spec-builders.h:1278:63:
note: at offset 16 into destination object =E2=80=98<anonymous>=E2=80=99 of=
 size 32
 1278 |     const std::string source_text(std::string("EXPECT_CALL(") + obj=
 +
", " +=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
                                                   |=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
            ~~~~~~~~~~~~~~~~~~~~~~~^~~~~
In static member function =E2=80=98static constexpr std::char_traits<char>:=
:char_type*
std::char_traits<char>::copy(char_type*, const char_type*, std::size_t)=E2=
=80=99,=20=20=20=20=20=20=20
    inlined from =E2=80=98constexpr std::__cxx11::basic_string<_CharT, _Tra=
its,
_Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&)
[with _CharT =3D char; _Traits =3D std::char_traits<char>;
 _Alloc =3D std::allocator<char>]=E2=80=99 at
/usr/include/c++/12/bits/basic_string.h:675:23,
    inlined from =E2=80=98constexpr std::__cxx11::basic_string<_CharT, _Tra=
its,
_Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits,
_Allocator>&&, const _CharT*) [with _CharT =3D char; _Traits =3D char
_traits<char>; _Alloc =3D allocator<char>]=E2=80=99 at
/usr/include/c++/12/bits/basic_string.h:3555:43,
    inlined from =E2=80=98testing::internal::TypedExpectation<F>&
testing::internal::MockSpec<F>::InternalExpectedAt(const char*, int, const
char*, const char*) [with F =3D void(bool)]=E2=80=99 at /usr/src/googletest=
/goog
lemock/include/gmock/gmock-spec-builders.h:1278:23,
    inlined from =E2=80=98virtual void Test_tests_Test::TestBody()=E2=80=99=
 at tmp.cpp:20:5:
/usr/include/c++/12/bits/char_traits.h:431:56: warning: =E2=80=98void*
__builtin_memcpy(void*, const void*, long unsigned int)=E2=80=99 writing 21=
 bytes into
a region of size 16 overflows the destination [-Wstringop-ove
rflow=3D]
  431 |         return static_cast<char_type*>(__builtin_memcpy(__s1, __s2,
__n));
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
/usr/src/googletest/googlemock/include/gmock/gmock-spec-builders.h: In memb=
er
function =E2=80=98virtual void Test_tests_Test::TestBody()=E2=80=99:
/usr/src/googletest/googlemock/include/gmock/gmock-spec-builders.h:1278:69:
note: at offset 16 into destination object =E2=80=98<anonymous>=E2=80=99 of=
 size 32
 1278 |     const std::string source_text(std::string("EXPECT_CALL(") + obj=
 +
", " +
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
In static member function =E2=80=98static constexpr std::char_traits<char>:=
:char_type*
std::char_traits<char>::copy(char_type*, const char_type*, std::size_t)=E2=
=80=99,
    inlined from =E2=80=98constexpr std::__cxx11::basic_string<_CharT, _Tra=
its,
_Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&)
[with _CharT =3D char; _Traits =3D std::char_traits<char>;
 _Alloc =3D std::allocator<char>]=E2=80=99 at
/usr/include/c++/12/bits/basic_string.h:675:23,
    inlined from =E2=80=98constexpr std::__cxx11::basic_string<_CharT, _Tra=
its,
_Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits,
_Allocator>&&, const _CharT*) [with _CharT =3D char; _Traits =3D char
_traits<char>; _Alloc =3D allocator<char>]=E2=80=99 at
/usr/include/c++/12/bits/basic_string.h:3555:43,
    inlined from =E2=80=98testing::internal::TypedExpectation<F>&
testing::internal::MockSpec<F>::InternalExpectedAt(const char*, int, const
char*, const char*) [with F =3D void(bool)]=E2=80=99 at /usr/src/googletest=
/goog
lemock/include/gmock/gmock-spec-builders.h:1278:23,
    inlined from =E2=80=98virtual void Test_tests_Test::TestBody()=E2=80=99=
 at tmp.cpp:20:5:
/usr/include/c++/12/bits/char_traits.h:431:56: warning: =E2=80=98void*
__builtin_memcpy(void*, const void*, long unsigned int)=E2=80=99 writing 39=
 bytes into
a region of size 16 overflows the destination [-Wstringop-ove
rflow=3D]
  431 |         return static_cast<char_type*>(__builtin_memcpy(__s1, __s2,
__n));
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
/usr/src/googletest/googlemock/include/gmock/gmock-spec-builders.h: In memb=
er
function =E2=80=98virtual void Test_tests_Test::TestBody()=E2=80=99:
/usr/src/googletest/googlemock/include/gmock/gmock-spec-builders.h:1278:76:
note: at offset 16 into destination object =E2=80=98<anonymous>=E2=80=99 of=
 size 32
 1278 |     const std::string source_text(std::string("EXPECT_CALL(") + obj=
 +
", " +
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
 1279 |                                   call + ")");
      |                                   ~~~~
In static member function =E2=80=98static constexpr std::char_traits<char>:=
:char_type*
std::char_traits<char>::copy(char_type*, const char_type*, std::size_t)=E2=
=80=99,
    inlined from =E2=80=98constexpr std::__cxx11::basic_string<_CharT, _Tra=
its,
_Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&)
[with _CharT =3D char; _Traits =3D std::char_traits<char>;
 _Alloc =3D std::allocator<char>]=E2=80=99 at
/usr/include/c++/12/bits/basic_string.h:675:23,
    inlined from =E2=80=98constexpr std::__cxx11::basic_string<_CharT, _Tra=
its,
_Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits,
_Allocator>&&, const _CharT*) [with _CharT =3D char; _Traits =3D char
_traits<char>; _Alloc =3D allocator<char>]=E2=80=99 at
/usr/include/c++/12/bits/basic_string.h:3555:43,
    inlined from =E2=80=98testing::internal::TypedExpectation<F>&
testing::internal::MockSpec<F>::InternalExpectedAt(const char*, int, const
char*, const char*) [with F =3D void(bool)]=E2=80=99 at /usr/src/googletest=
/goog
lemock/include/gmock/gmock-spec-builders.h:1278:23,
    inlined from =E2=80=98virtual void Test_tests_Test::TestBody()=E2=80=99=
 at tmp.cpp:20:5:
/usr/include/c++/12/bits/char_traits.h:431:56: warning: =E2=80=98void*
__builtin_memcpy(void*, const void*, long unsigned int)=E2=80=99 writing 40=
 bytes into
a region of size 16 overflows the destination [-Wstringop-ove
rflow=3D]
  431 |         return static_cast<char_type*>(__builtin_memcpy(__s1, __s2,
__n));
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
/usr/src/googletest/googlemock/include/gmock/gmock-spec-builders.h: In memb=
er
function =E2=80=98virtual void Test_tests_Test::TestBody()=E2=80=99:
/usr/src/googletest/googlemock/include/gmock/gmock-spec-builders.h:1278:23:
note: at offset 16 into destination object =E2=80=98source_text=E2=80=99 of=
 size 32
 1278 |     const std::string source_text(std::string("EXPECT_CALL(") + obj=
 +
", " +
      |                       ^~~~~~~~~~~
```

gcc-11 continues to work.=