https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93232
Bug ID: 93232
Summary: std::array warning: writing 1 byte into a region of
size 0
[ttps://gcc.gnu.org/onlinedocs/gcc/Warning-Options.htm
l#index-Wstringop-overflow=-Wstringop-overflow=m]
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: euloanty at live dot com
Target Milestone: ---
https://bitbucket.org/ejsvifq_mabmip/fast_io/src/master/examples/0021.benchmark/output_10M_size_t.cc
I can only repeat this bug on this code. I cannot find out why.
D:\hg\w4\fast_io\examples\0021.benchmark>g++ -o output_10M_size_t
output_10M_size_t.cc -Ofast -std=c++2a -s
In file included from ../../include/fast_io_core.h:38,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
In function 'constexpr void fast_io::details::output_base_number(output&, U)
[with char8_t base = 10; bool uppercase = false; bool ln = true; output =
fast_io::otransform_function_default_construct<fast_io::basic_obuf<fast_io::basic_file_wrapper<fast_io::basic_win32_file<char>,
68> >, fast_io::binary_to_text<false>, char, 4096, false>; U = long long
unsigned int]',
inlined from 'int main()' at ../../include/fast_io_core_impl/base.h:631:44:
../../include/fast_io_core_impl/base.h:203:17: warning: writing 1 byte into a
region of size 0
[ttps://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wstringop-overflow=-Wstringop-overflow=m]
203 | *--reserved=u8'\n';
| ~~~~~~~~~~~^~~~~~~
In file included from D:/msys64/mingw64/include/c++/10.0.0/tuple:39,
from
D:/msys64/mingw64/include/c++/10.0.0/bits/unique_ptr.h:37,
from D:/msys64/mingw64/include/c++/10.0.0/memory:82,
from ../../include/fast_io_core.h:20,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
D:/msys64/mingw64/include/c++/10.0.0/array: In function 'int main()':
D:/msys64/mingw64/include/c++/10.0.0/array:110:56: note: at offset -1 to object
'std::array<char, 4096>::_M_elems' with size 4096 declared here
110 | typename _AT_Type::_Type _M_elems;
| ^~~~~~~~
In file included from ../../include/fast_io_core.h:38,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
In function 'constexpr void fast_io::details::output_base_number(output&, U)
[with char8_t base = 10; bool uppercase = false; bool ln = true; output =
fast_io::otransform_function_default_construct<fast_io::basic_obuf<fast_io::basic_file_wrapper<fast_io::basic_win32_file<char>,
68> >, fast_io::binary_to_text<false>, char, 4096, false>; U = long long
unsigned int]',
inlined from 'int main()' at ../../include/fast_io_core_impl/base.h:631:44:
../../include/fast_io_core_impl/base.h:203:17: warning: writing 1 byte into a
region of size 0
[ttps://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wstringop-overflow=-Wstringop-overflow=m]
203 | *--reserved=u8'\n';
| ~~~~~~~~~~~^~~~~~~
In file included from D:/msys64/mingw64/include/c++/10.0.0/tuple:39,
from
D:/msys64/mingw64/include/c++/10.0.0/bits/unique_ptr.h:37,
from D:/msys64/mingw64/include/c++/10.0.0/memory:82,
from ../../include/fast_io_core.h:20,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
D:/msys64/mingw64/include/c++/10.0.0/array: In function 'int main()':
D:/msys64/mingw64/include/c++/10.0.0/array:110:56: note: at offset -1 to object
'std::array<char, 4096>::_M_elems' with size 4096 declared here
110 | typename _AT_Type::_Type _M_elems;
| ^~~~~~~~
In file included from ../../include/fast_io_core.h:38,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
In function 'constexpr void fast_io::details::output_base_number(output&, U)
[with char8_t base = 10; bool uppercase = false; bool ln = true; output =
fast_io::otransform_function_default_construct<fast_io::basic_obuf<fast_io::basic_file_wrapper<fast_io::basic_win32_file<char>,
68> >, fast_io::binary_to_text<false>, char, 4096, false>; U = long long
unsigned int]',
inlined from 'int main()' at ../../include/fast_io_core_impl/base.h:631:44:
../../include/fast_io_core_impl/base.h:203:17: warning: writing 1 byte into a
region of size 0
[ttps://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wstringop-overflow=-Wstringop-overflow=m]
203 | *--reserved=u8'\n';
| ~~~~~~~~~~~^~~~~~~
In file included from D:/msys64/mingw64/include/c++/10.0.0/tuple:39,
from
D:/msys64/mingw64/include/c++/10.0.0/bits/unique_ptr.h:37,
from D:/msys64/mingw64/include/c++/10.0.0/memory:82,
from ../../include/fast_io_core.h:20,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
D:/msys64/mingw64/include/c++/10.0.0/array: In function 'int main()':
D:/msys64/mingw64/include/c++/10.0.0/array:110:56: note: at offset -1 to object
'std::array<char, 4096>::_M_elems' with size 4096 declared here
110 | typename _AT_Type::_Type _M_elems;
| ^~~~~~~~
In file included from ../../include/fast_io_core.h:38,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
In function 'constexpr void fast_io::details::output_base_number(output&, U)
[with char8_t base = 10; bool uppercase = false; bool ln = true; output =
fast_io::otransform_function_default_construct<fast_io::basic_obuf<fast_io::basic_file_wrapper<fast_io::basic_win32_file<char>,
68> >, fast_io::ascii_to_ebcdic, char, 4096, false>; U = long long unsigned
int]',
inlined from 'int main()' at ../../include/fast_io_core_impl/base.h:631:44:
../../include/fast_io_core_impl/base.h:203:17: warning: writing 1 byte into a
region of size 0
[ttps://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wstringop-overflow=-Wstringop-overflow=m]
203 | *--reserved=u8'\n';
| ~~~~~~~~~~~^~~~~~~
In file included from D:/msys64/mingw64/include/c++/10.0.0/tuple:39,
from
D:/msys64/mingw64/include/c++/10.0.0/bits/unique_ptr.h:37,
from D:/msys64/mingw64/include/c++/10.0.0/memory:82,
from ../../include/fast_io_core.h:20,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
D:/msys64/mingw64/include/c++/10.0.0/array: In function 'int main()':
D:/msys64/mingw64/include/c++/10.0.0/array:110:56: note: at offset -1 to object
'std::array<char, 4096>::_M_elems' with size 4096 declared here
110 | typename _AT_Type::_Type _M_elems;
| ^~~~~~~~
In file included from ../../include/fast_io_core.h:38,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
In function 'constexpr void fast_io::details::output_base_number(output&, U)
[with char8_t base = 10; bool uppercase = false; bool ln = true; output =
fast_io::otransform_function_default_construct<fast_io::basic_obuf<fast_io::basic_file_wrapper<fast_io::basic_win32_file<char>,
68> >, fast_io::ascii_to_ebcdic, char, 4096, false>; U = long long unsigned
int]',
inlined from 'int main()' at ../../include/fast_io_core_impl/base.h:631:44:
../../include/fast_io_core_impl/base.h:203:17: warning: writing 1 byte into a
region of size 0
[ttps://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wstringop-overflow=-Wstringop-overflow=m]
203 | *--reserved=u8'\n';
| ~~~~~~~~~~~^~~~~~~
In file included from D:/msys64/mingw64/include/c++/10.0.0/tuple:39,
from
D:/msys64/mingw64/include/c++/10.0.0/bits/unique_ptr.h:37,
from D:/msys64/mingw64/include/c++/10.0.0/memory:82,
from ../../include/fast_io_core.h:20,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
D:/msys64/mingw64/include/c++/10.0.0/array: In function 'int main()':
D:/msys64/mingw64/include/c++/10.0.0/array:110:56: note: at offset -1 to object
'std::array<char, 4096>::_M_elems' with size 4096 declared here
110 | typename _AT_Type::_Type _M_elems;
| ^~~~~~~~
In file included from ../../include/fast_io_core.h:38,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
In function 'constexpr void fast_io::details::output_base_number(output&, U)
[with char8_t base = 10; bool uppercase = false; bool ln = true; output =
fast_io::otransform_function_default_construct<fast_io::basic_obuf<fast_io::basic_file_wrapper<fast_io::basic_win32_file<char>,
68> >, fast_io::ascii_to_ebcdic, char, 4096, false>; U = long long unsigned
int]',
inlined from 'int main()' at ../../include/fast_io_core_impl/base.h:631:44:
../../include/fast_io_core_impl/base.h:203:17: warning: writing 1 byte into a
region of size 0
[ttps://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wstringop-overflow=-Wstringop-overflow=m]
203 | *--reserved=u8'\n';
| ~~~~~~~~~~~^~~~~~~
In file included from D:/msys64/mingw64/include/c++/10.0.0/tuple:39,
from
D:/msys64/mingw64/include/c++/10.0.0/bits/unique_ptr.h:37,
from D:/msys64/mingw64/include/c++/10.0.0/memory:82,
from ../../include/fast_io_core.h:20,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
D:/msys64/mingw64/include/c++/10.0.0/array: In function 'int main()':
D:/msys64/mingw64/include/c++/10.0.0/array:110:56: note: at offset -1 to object
'std::array<char, 4096>::_M_elems' with size 4096 declared here
110 | typename _AT_Type::_Type _M_elems;
| ^~~~~~~~
D:\hg\w4\fast_io\examples\0021.benchmark>g++ -o output_10M_size_t
output_10M_size_t.cc -Ofast -std=c++2a -s
In file included from ../../include/fast_io_core.h:38,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
In function 'constexpr void fast_io::details::output_base_number(output&, U)
[with char8_t base = 10; bool uppercase = false; bool ln = true; output =
fast_io::otransform_function_default_construct<fast_io::basic_obuf<fast_io::basic_file_wrapper<fast_io::basic_win32_file<char>,
68> >, fast_io::binary_to_text<false>, char, 4096, false>; U = long long
unsigned int]',
inlined from 'int main()' at ../../include/fast_io_core_impl/base.h:631:44:
../../include/fast_io_core_impl/base.h:203:17: warning: writing 1 byte into a
region of size 0
[ttps://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wstringop-overflow=-Wstringop-overflow=m]
203 | *--reserved=u8'\n';
| ~~~~~~~~~~~^~~~~~~
In file included from D:/msys64/mingw64/include/c++/10.0.0/tuple:39,
from
D:/msys64/mingw64/include/c++/10.0.0/bits/unique_ptr.h:37,
from D:/msys64/mingw64/include/c++/10.0.0/memory:82,
from ../../include/fast_io_core.h:20,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
D:/msys64/mingw64/include/c++/10.0.0/array: In function 'int main()':
D:/msys64/mingw64/include/c++/10.0.0/array:110:56: note: at offset -1 to object
'std::array<char, 4096>::_M_elems' with size 4096 declared here
110 | typename _AT_Type::_Type _M_elems;
| ^~~~~~~~
In file included from ../../include/fast_io_core.h:38,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
In function 'constexpr void fast_io::details::output_base_number(output&, U)
[with char8_t base = 10; bool uppercase = false; bool ln = true; output =
fast_io::otransform_function_default_construct<fast_io::basic_obuf<fast_io::basic_file_wrapper<fast_io::basic_win32_file<char>,
68> >, fast_io::binary_to_text<false>, char, 4096, false>; U = long long
unsigned int]',
inlined from 'int main()' at ../../include/fast_io_core_impl/base.h:631:44:
../../include/fast_io_core_impl/base.h:203:17: warning: writing 1 byte into a
region of size 0
[ttps://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wstringop-overflow=-Wstringop-overflow=m]
203 | *--reserved=u8'\n';
| ~~~~~~~~~~~^~~~~~~
In file included from D:/msys64/mingw64/include/c++/10.0.0/tuple:39,
from
D:/msys64/mingw64/include/c++/10.0.0/bits/unique_ptr.h:37,
from D:/msys64/mingw64/include/c++/10.0.0/memory:82,
from ../../include/fast_io_core.h:20,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
D:/msys64/mingw64/include/c++/10.0.0/array: In function 'int main()':
D:/msys64/mingw64/include/c++/10.0.0/array:110:56: note: at offset -1 to object
'std::array<char, 4096>::_M_elems' with size 4096 declared here
110 | typename _AT_Type::_Type _M_elems;
| ^~~~~~~~
In file included from ../../include/fast_io_core.h:38,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
In function 'constexpr void fast_io::details::output_base_number(output&, U)
[with char8_t base = 10; bool uppercase = false; bool ln = true; output =
fast_io::otransform_function_default_construct<fast_io::basic_obuf<fast_io::basic_file_wrapper<fast_io::basic_win32_file<char>,
68> >, fast_io::binary_to_text<false>, char, 4096, false>; U = long long
unsigned int]',
inlined from 'int main()' at ../../include/fast_io_core_impl/base.h:631:44:
../../include/fast_io_core_impl/base.h:203:17: warning: writing 1 byte into a
region of size 0
[ttps://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wstringop-overflow=-Wstringop-overflow=m]
203 | *--reserved=u8'\n';
| ~~~~~~~~~~~^~~~~~~
In file included from D:/msys64/mingw64/include/c++/10.0.0/tuple:39,
from
D:/msys64/mingw64/include/c++/10.0.0/bits/unique_ptr.h:37,
from D:/msys64/mingw64/include/c++/10.0.0/memory:82,
from ../../include/fast_io_core.h:20,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
D:/msys64/mingw64/include/c++/10.0.0/array: In function 'int main()':
D:/msys64/mingw64/include/c++/10.0.0/array:110:56: note: at offset -1 to object
'std::array<char, 4096>::_M_elems' with size 4096 declared here
110 | typename _AT_Type::_Type _M_elems;
| ^~~~~~~~
In file included from ../../include/fast_io_core.h:38,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
In function 'constexpr void fast_io::details::output_base_number(output&, U)
[with char8_t base = 10; bool uppercase = false; bool ln = true; output =
fast_io::otransform_function_default_construct<fast_io::basic_obuf<fast_io::basic_file_wrapper<fast_io::basic_win32_file<char>,
68> >, fast_io::ascii_to_ebcdic, char, 4096, false>; U = long long unsigned
int]',
inlined from 'int main()' at ../../include/fast_io_core_impl/base.h:631:44:
../../include/fast_io_core_impl/base.h:203:17: warning: writing 1 byte into a
region of size 0
[ttps://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wstringop-overflow=-Wstringop-overflow=m]
203 | *--reserved=u8'\n';
| ~~~~~~~~~~~^~~~~~~
In file included from D:/msys64/mingw64/include/c++/10.0.0/tuple:39,
from
D:/msys64/mingw64/include/c++/10.0.0/bits/unique_ptr.h:37,
from D:/msys64/mingw64/include/c++/10.0.0/memory:82,
from ../../include/fast_io_core.h:20,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
D:/msys64/mingw64/include/c++/10.0.0/array: In function 'int main()':
D:/msys64/mingw64/include/c++/10.0.0/array:110:56: note: at offset -1 to object
'std::array<char, 4096>::_M_elems' with size 4096 declared here
110 | typename _AT_Type::_Type _M_elems;
| ^~~~~~~~
In file included from ../../include/fast_io_core.h:38,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
In function 'constexpr void fast_io::details::output_base_number(output&, U)
[with char8_t base = 10; bool uppercase = false; bool ln = true; output =
fast_io::otransform_function_default_construct<fast_io::basic_obuf<fast_io::basic_file_wrapper<fast_io::basic_win32_file<char>,
68> >, fast_io::ascii_to_ebcdic, char, 4096, false>; U = long long unsigned
int]',
inlined from 'int main()' at ../../include/fast_io_core_impl/base.h:631:44:
../../include/fast_io_core_impl/base.h:203:17: warning: writing 1 byte into a
region of size 0
[ttps://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wstringop-overflow=-Wstringop-overflow=m]
203 | *--reserved=u8'\n';
| ~~~~~~~~~~~^~~~~~~
In file included from D:/msys64/mingw64/include/c++/10.0.0/tuple:39,
from
D:/msys64/mingw64/include/c++/10.0.0/bits/unique_ptr.h:37,
from D:/msys64/mingw64/include/c++/10.0.0/memory:82,
from ../../include/fast_io_core.h:20,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
D:/msys64/mingw64/include/c++/10.0.0/array: In function 'int main()':
D:/msys64/mingw64/include/c++/10.0.0/array:110:56: note: at offset -1 to object
'std::array<char, 4096>::_M_elems' with size 4096 declared here
110 | typename _AT_Type::_Type _M_elems;
| ^~~~~~~~
In file included from ../../include/fast_io_core.h:38,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
In function 'constexpr void fast_io::details::output_base_number(output&, U)
[with char8_t base = 10; bool uppercase = false; bool ln = true; output =
fast_io::otransform_function_default_construct<fast_io::basic_obuf<fast_io::basic_file_wrapper<fast_io::basic_win32_file<char>,
68> >, fast_io::ascii_to_ebcdic, char, 4096, false>; U = long long unsigned
int]',
inlined from 'int main()' at ../../include/fast_io_core_impl/base.h:631:44:
../../include/fast_io_core_impl/base.h:203:17: warning: writing 1 byte into a
region of size 0
[ttps://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wstringop-overflow=-Wstringop-overflow=m]
203 | *--reserved=u8'\n';
| ~~~~~~~~~~~^~~~~~~
In file included from D:/msys64/mingw64/include/c++/10.0.0/tuple:39,
from
D:/msys64/mingw64/include/c++/10.0.0/bits/unique_ptr.h:37,
from D:/msys64/mingw64/include/c++/10.0.0/memory:82,
from ../../include/fast_io_core.h:20,
from ../../include/fast_io_freestanding.h:5,
from ../../include/fast_io_hosted.h:10,
from ../../include/fast_io.h:3,
from timer.h:5,
from output_10M_size_t.cc:1:
D:/msys64/mingw64/include/c++/10.0.0/array: In function 'int main()':
D:/msys64/mingw64/include/c++/10.0.0/array:110:56: note: at offset -1 to object
'std::array<char, 4096>::_M_elems' with size 4096 declared here
110 | typename _AT_Type::_Type _M_elems;
