https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65085
Bug ID: 65085
Summary: Move-assigned empty string corrupt with
-D_GLIBCXX_USE_CXX11_ABI=1
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: steveire at gmail dot com
GCC 5.0 generates corrupt CMake binaries currently:
http://thread.gmane.org/gmane.comp.programming.tools.cmake.devel/12392/focus=12420
The cause seems to be between the new ABI and moving an empty std::string:
stephen@hal:~/dev/src/playground/cpp{master}$
/home/stephen/dev/prefix/bin/g++-5.0 -v -std=gnu++11 membug.cpp
-D_GLIBCXX_USE_CXX11_ABI=1 -g
Using built-in specs.
COLLECT_GCC=/home/stephen/dev/prefix/bin/g++-5.0
COLLECT_LTO_WRAPPER=/home/stephen/dev/prefix/libexec/gcc/x86_64-unknown-linux-gnu/5.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../../../src/gcc/configure --prefix=/home/stephen/dev/prefix
--enable-languages=c,c++ --program-suffix=-5.0 --enable-checking=release
--with-system-zlib
Thread model: posix
gcc version 5.0.0 20150130 (experimental) (GCC)
COLLECT_GCC_OPTIONS='-v' '-std=gnu++11' '-D' '_GLIBCXX_USE_CXX11_ABI=1' '-g'
'-shared-libgcc' '-mtune=generic' '-march=x86-64'
/home/stephen/dev/prefix/libexec/gcc/x86_64-unknown-linux-gnu/5.0.0/cc1plus
-quiet -v -imultiarch x86_64-linux-gnu -D_GNU_SOURCE -D
_GLIBCXX_USE_CXX11_ABI=1 membug.cpp -quiet -dumpbase membug.cpp -mtune=generic
-march=x86-64 -auxbase membug -g -std=gnu++11 -version -o /tmp/ccruY1vz.s
GNU C++11 (GCC) version 5.0.0 20150130 (experimental)
(x86_64-unknown-linux-gnu)
compiled by GNU C version 5.0.0 20150130 (experimental), GMP version
6.0.0, MPFR version 3.1.2-p3, MPC version 1.0.2
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/../../../../x86_64-unknown-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/../../include/c++/5.0.0
/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/../../include/c++/5.0.0/x86_64-unknown-linux-gnu
/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/../../include/c++/5.0.0/backward
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/usr/local/include
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/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
GNU C++11 (GCC) version 5.0.0 20150130 (experimental)
(x86_64-unknown-linux-gnu)
compiled by GNU C version 5.0.0 20150130 (experimental), GMP version
6.0.0, MPFR version 3.1.2-p3, MPC version 1.0.2
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 017a5c35f0da909f1ce909a8ebb21479
COLLECT_GCC_OPTIONS='-v' '-std=gnu++11' '-D' '_GLIBCXX_USE_CXX11_ABI=1' '-g'
'-shared-libgcc' '-mtune=generic' '-march=x86-64'
as -v --64 -o /tmp/ccA64A8Z.o /tmp/ccruY1vz.s
GNU assembler version 2.24.51 (x86_64-linux-gnu) using BFD version (GNU
Binutils for Ubuntu) 2.24.90.20141014
COMPILER_PATH=/home/stephen/dev/prefix/libexec/gcc/x86_64-unknown-linux-gnu/5.0.0/:/home/stephen/dev/prefix/libexec/gcc/x86_64-unknown-linux-gnu/5.0.0/:/home/stephen/dev/prefix/libexec/gcc/x86_64-unknown-linux-gnu/:/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/:/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/
LIBRARY_PATH=/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/:/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/../../../x86_64-linux-gnu/:/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/../../../../lib64/:/lib/x86_64-linux-gnu/:/lib/../lib64/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib64/:/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/../../../:/lib/:/usr/lib/
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/home/stephen/dev/prefix/libexec/gcc/x86_64-unknown-linux-gnu/5.0.0/collect2
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/usr/lib/x86_64-linux-gnu/crt1.o /usr/lib/x86_64-linux-gnu/crti.o
/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/crtbegin.o
-L/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0
-L/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/../../../x86_64-linux-gnu
-L/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/../../../../lib64
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/tmp/ccA64A8Z.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc
/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/crtend.o
/usr/lib/x86_64-linux-gnu/crtn.o
stephen@hal:~/dev/src/playground/cpp{master}$ valgrind ./a.out
==22091== Memcheck, a memory error detector
==22091== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==22091== Using Valgrind-3.10.0 and LibVEX; rerun with -h for copyright info
==22091== Command: ./a.out
==22091==
==22091== Conditional jump or move depends on uninitialised value(s)
==22091== at 0x4C2E129: strlen (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==22091== by 0x4F3DB08: length (char_traits.h:263)
==22091== by 0x4F3DB08: std::basic_ostream<char, std::char_traits<char> >&
std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
std::char_traits<char> >&, char const*) (ostream:562)
==22091== by 0x400CA2: main (membug.cpp:10)
==22091==
==22091== Conditional jump or move depends on uninitialised value(s)
==22091== at 0x4C2E138: strlen (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==22091== by 0x4F3DB08: length (char_traits.h:263)
==22091== by 0x4F3DB08: std::basic_ostream<char, std::char_traits<char> >&
std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
std::char_traits<char> >&, char const*) (ostream:562)
==22091== by 0x400CA2: main (membug.cpp:10)
==22091==
==22091== Conditional jump or move depends on uninitialised value(s)
==22091== at 0x5746271: _IO_file_overflow@@GLIBC_2.2.5 (fileops.c:859)
==22091== by 0x574718B: _IO_default_xsputn (genops.c:480)
==22091== by 0x5745161: _IO_file_xsputn@@GLIBC_2.2.5 (fileops.c:1345)
==22091== by 0x573AB6C: fwrite (iofwrite.c:43)
==22091== by 0x4F3D80D: sputn (streambuf:451)
==22091== by 0x4F3D80D: __ostream_write<char, std::char_traits<char> >
(ostream_insert.h:50)
==22091== by 0x4F3D80D: std::basic_ostream<char, std::char_traits<char> >&
std::__ostream_insert<char, std::char_traits<char> >(std::basic_ostream<char,
std::char_traits<char> >&, char const*, long) (ostream_insert.h:101)
==22091== by 0x4F3DB16: std::basic_ostream<char, std::char_traits<char> >&
std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
std::char_traits<char> >&, char const*) (ostream:561)
==22091== by 0x400CA2: main (membug.cpp:10)
==22091==
==22091== Conditional jump or move depends on uninitialised value(s)
==22091== at 0x574629E: _IO_file_overflow@@GLIBC_2.2.5 (fileops.c:867)
==22091== by 0x574718B: _IO_default_xsputn (genops.c:480)
==22091== by 0x5745161: _IO_file_xsputn@@GLIBC_2.2.5 (fileops.c:1345)
==22091== by 0x573AB6C: fwrite (iofwrite.c:43)
==22091== by 0x4F3D80D: sputn (streambuf:451)
==22091== by 0x4F3D80D: __ostream_write<char, std::char_traits<char> >
(ostream_insert.h:50)
==22091== by 0x4F3D80D: std::basic_ostream<char, std::char_traits<char> >&
std::__ostream_insert<char, std::char_traits<char> >(std::basic_ostream<char,
std::char_traits<char> >&, char const*, long) (ostream_insert.h:101)
==22091== by 0x4F3DB16: std::basic_ostream<char, std::char_traits<char> >&
std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
std::char_traits<char> >&, char const*) (ostream:561)
==22091== by 0x400CA2: main (membug.cpp:10)
==22091==
==22091== Conditional jump or move depends on uninitialised value(s)
==22091== at 0x574718F: _IO_default_xsputn (genops.c:480)
==22091== by 0x5745161: _IO_file_xsputn@@GLIBC_2.2.5 (fileops.c:1345)
==22091== by 0x573AB6C: fwrite (iofwrite.c:43)
==22091== by 0x4F3D80D: sputn (streambuf:451)
==22091== by 0x4F3D80D: __ostream_write<char, std::char_traits<char> >
(ostream_insert.h:50)
==22091== by 0x4F3D80D: std::basic_ostream<char, std::char_traits<char> >&
std::__ostream_insert<char, std::char_traits<char> >(std::basic_ostream<char,
std::char_traits<char> >&, char const*, long) (ostream_insert.h:101)
==22091== by 0x4F3DB16: std::basic_ostream<char, std::char_traits<char> >&
std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
std::char_traits<char> >&, char const*) (ostream:561)
==22091== by 0x400CA2: main (membug.cpp:10)
==22091==
==22091== Syscall param write(buf) points to uninitialised byte(s)
==22091== at 0x57B7130: __write_nocancel (syscall-template.S:81)
==22091== by 0x5744A82: _IO_file_write@@GLIBC_2.2.5 (fileops.c:1253)
==22091== by 0x5745F5B: new_do_write (fileops.c:530)
==22091== by 0x5745F5B: _IO_do_write@@GLIBC_2.2.5 (fileops.c:503)
==22091== by 0x5746332: _IO_file_overflow@@GLIBC_2.2.5 (fileops.c:868)
==22091== by 0x57427E8: putc (putc.c:31)
==22091== by 0x4F3D29C: sputc (streambuf:434)
==22091== by 0x4F3D29C: std::ostream::put(char) (ostream.tcc:163)
==22091== by 0x4F3D4CE: std::basic_ostream<char, std::char_traits<char> >&
std::endl<char, std::char_traits<char> >(std::basic_ostream<char,
std::char_traits<char> >&) (ostream:591)
==22091== by 0x400CAF: main (membug.cpp:10)
==22091== Address 0x4026000 is not stack'd, malloc'd or (recently) free'd
==22091==
==22091==
==22091== HEAP SUMMARY:
==22091== in use at exit: 72,704 bytes in 1 blocks
==22091== total heap usage: 1 allocs, 0 frees, 72,704 bytes allocated
==22091==
==22091== LEAK SUMMARY:
==22091== definitely lost: 0 bytes in 0 blocks
==22091== indirectly lost: 0 bytes in 0 blocks
==22091== possibly lost: 0 bytes in 0 blocks
==22091== still reachable: 72,704 bytes in 1 blocks
==22091== suppressed: 0 bytes in 0 blocks
==22091== Rerun with --leak-check=full to see details of leaked memory
==22091==
==22091== For counts of detected and suppressed errors, rerun with: -v
==22091== Use --track-origins=yes to see where uninitialised values come from
==22091== ERROR SUMMARY: 6 errors from 6 contexts (suppressed: 1 from 1)
stephen@hal:~/dev/src/playground/cpp{master}$
/home/stephen/dev/prefix/bin/g++-5.0 -v -std=gnu++11 membug.cpp
-D_GLIBCXX_USE_CXX11_ABI=0 -g
Using built-in specs.
COLLECT_GCC=/home/stephen/dev/prefix/bin/g++-5.0
COLLECT_LTO_WRAPPER=/home/stephen/dev/prefix/libexec/gcc/x86_64-unknown-linux-gnu/5.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../../../src/gcc/configure --prefix=/home/stephen/dev/prefix
--enable-languages=c,c++ --program-suffix=-5.0 --enable-checking=release
--with-system-zlib
Thread model: posix
gcc version 5.0.0 20150130 (experimental) (GCC)
COLLECT_GCC_OPTIONS='-v' '-std=gnu++11' '-D' '_GLIBCXX_USE_CXX11_ABI=0' '-g'
'-shared-libgcc' '-mtune=generic' '-march=x86-64'
/home/stephen/dev/prefix/libexec/gcc/x86_64-unknown-linux-gnu/5.0.0/cc1plus
-quiet -v -imultiarch x86_64-linux-gnu -D_GNU_SOURCE -D
_GLIBCXX_USE_CXX11_ABI=0 membug.cpp -quiet -dumpbase membug.cpp -mtune=generic
-march=x86-64 -auxbase membug -g -std=gnu++11 -version -o /tmp/ccyzxV7A.s
GNU C++11 (GCC) version 5.0.0 20150130 (experimental)
(x86_64-unknown-linux-gnu)
compiled by GNU C version 5.0.0 20150130 (experimental), GMP version
6.0.0, MPFR version 3.1.2-p3, MPC version 1.0.2
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/../../../../x86_64-unknown-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/../../include/c++/5.0.0
/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/../../include/c++/5.0.0/x86_64-unknown-linux-gnu
/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/../../include/c++/5.0.0/backward
/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/include
/usr/local/include
/home/stephen/dev/prefix/include
/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
GNU C++11 (GCC) version 5.0.0 20150130 (experimental)
(x86_64-unknown-linux-gnu)
compiled by GNU C version 5.0.0 20150130 (experimental), GMP version
6.0.0, MPFR version 3.1.2-p3, MPC version 1.0.2
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 017a5c35f0da909f1ce909a8ebb21479
COLLECT_GCC_OPTIONS='-v' '-std=gnu++11' '-D' '_GLIBCXX_USE_CXX11_ABI=0' '-g'
'-shared-libgcc' '-mtune=generic' '-march=x86-64'
as -v --64 -o /tmp/cc2PCe0h.o /tmp/ccyzxV7A.s
GNU assembler version 2.24.51 (x86_64-linux-gnu) using BFD version (GNU
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COMPILER_PATH=/home/stephen/dev/prefix/libexec/gcc/x86_64-unknown-linux-gnu/5.0.0/:/home/stephen/dev/prefix/libexec/gcc/x86_64-unknown-linux-gnu/5.0.0/:/home/stephen/dev/prefix/libexec/gcc/x86_64-unknown-linux-gnu/:/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/:/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/
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-L/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0
-L/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/../../../x86_64-linux-gnu
-L/home/stephen/dev/prefix/lib/gcc/x86_64-unknown-linux-gnu/5.0.0/../../../../lib64
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-L/usr/lib/../lib64
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stephen@hal:~/dev/src/playground/cpp{master}$ valgrind ./a.out
==22107== Memcheck, a memory error detector
==22107== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==22107== Using Valgrind-3.10.0 and LibVEX; rerun with -h for copyright info
==22107== Command: ./a.out
==22107==
==22107==
==22107== HEAP SUMMARY:
==22107== in use at exit: 72,704 bytes in 1 blocks
==22107== total heap usage: 1 allocs, 0 frees, 72,704 bytes allocated
==22107==
==22107== LEAK SUMMARY:
==22107== definitely lost: 0 bytes in 0 blocks
==22107== indirectly lost: 0 bytes in 0 blocks
==22107== possibly lost: 0 bytes in 0 blocks
==22107== still reachable: 72,704 bytes in 1 blocks
==22107== suppressed: 0 bytes in 0 blocks
==22107== Rerun with --leak-check=full to see details of leaked memory
==22107==
==22107== For counts of detected and suppressed errors, rerun with: -v
==22107== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 1 from 1)
stephen@hal:~/dev/src/playground/cpp{master}$ cat membug.cpp
#include <cstdio>
#include <iostream>
#include <vector>
#include <string>
int main() {
std::string s("");
std::string m = std::move(s);
std::cout << m.c_str() << std::endl;
return 0;
}
