https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98481
Bug ID: 98481
Summary: std::vector<std::string>::size_type as return type
gets tagged with abi:cxx11
Product: gcc
Version: 10.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: Daniel.Riley at cornell dot edu
Target Milestone: ---
Created attachment 49860
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49860&action=edit
demonstration of std::vector<std::string>::size_type mangling inconsistency
In the attached program, S1::asdf() and S2::asdf() are mangled
differently--S1:asdf gets mangled with S1::asdf[abi:cxx11](), despite the two
member functions having the same declared types and compatible types in the
definitions:
movq S1::asdf[abi:cxx11]() const, -16(%rbp)
movq S2::asdf() const, -32(%rbp)
This seems to break the rule that if T and U are the same type, then 'T x()
const' and 'U x() const' should have the same mangling. Adding 'abi:cxx11' can
cause linkage errors with separate compilation and breaks compatibility with
other compilers.
According to compiler explorer, this is new behavior in gcc10, see
https://godbolt.org/z/P7j4We
Still observed in 11.0.0 20201205.
Compilation output:
% g++ -v -save-temps -std=c++17 m.cc
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../libexec/gcc/x86_64-unknown-linux-gnu/10.2.1/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../configure
--prefix=/build/muz/g10/w/tmp/BUILDROOT/6af2184a61ae4a90cb849a228a342f29/opt/cmssw/slc7_amd64_gcc10/external/gcc/10.2.0
--disable-multilib --disable-nls --disable-dssi
--enable-languages=c,c++,fortran --enable-gnu-indirect-function
--enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object
--enable-plugin --with-linker-hash-style=gnu --enable-linker-build-id
--enable-ld=default --enable-lto --enable-gold=yes
--with-gmp=/build/muz/g10/w/tmp/BUILDROOT/6af2184a61ae4a90cb849a228a342f29/opt/cmssw/slc7_amd64_gcc10/external/gcc/10.2.0
--with-mpfr=/build/muz/g10/w/tmp/BUILDROOT/6af2184a61ae4a90cb849a228a342f29/opt/cmssw/slc7_amd64_gcc10/external/gcc/10.2.0
--enable-bootstrap
--with-mpc=/build/muz/g10/w/tmp/BUILDROOT/6af2184a61ae4a90cb849a228a342f29/opt/cmssw/slc7_amd64_gcc10/external/gcc/10.2.0
--with-isl=/build/muz/g10/w/tmp/BUILDROOT/6af2184a61ae4a90cb849a228a342f29/opt/cmssw/slc7_amd64_gcc10/external/gcc/10.2.0
--enable-checking=release --build=x86_64-unknown-linux-gnu
--host=x86_64-unknown-linux-gnu --enable-libstdcxx-time=rt --enable-shared
--disable-libgcj CC='gcc -fPIC' CXX='c++ -fPIC' CPP=cpp CXXCPP='c++ -E'
CFLAGS=-I/build/muz/g10/w/tmp/BUILDROOT/6af2184a61ae4a90cb849a228a342f29/opt/cmssw/slc7_amd64_gcc10/external/gcc/10.2.0/tmp/sw/include
CXXFLAGS=-I/build/muz/g10/w/tmp/BUILDROOT/6af2184a61ae4a90cb849a228a342f29/opt/cmssw/slc7_amd64_gcc10/external/gcc/10.2.0/tmp/sw/include
LDFLAGS=-L/build/muz/g10/w/tmp/BUILDROOT/6af2184a61ae4a90cb849a228a342f29/opt/cmssw/slc7_amd64_gcc10/external/gcc/10.2.0/tmp/sw/lib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.2.1 20200803 (GCC)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-std=c++17' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../libexec/gcc/x86_64-unknown-linux-gnu/10.2.1/cc1plus
-E -quiet -v -iprefix
/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/
-isystem
/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/include
-D_GNU_SOURCE m.cc -mtune=generic -march=x86-64 -std=c++17 -fpch-preprocess
-fabi-version=0 -o m.ii
ignoring nonexistent directory
"/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/../../../../x86_64-unknown-linux-gnu/include"
ignoring duplicate directory
"/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/../../../../include/c++/10.2.1"
ignoring duplicate directory
"/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/../../../../include/c++/10.2.1/x86_64-unknown-linux-gnu"
ignoring duplicate directory
"/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/../../../../include/c++/10.2.1/backward"
ignoring duplicate directory
"/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/include"
ignoring duplicate directory
"/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/../../include"
ignoring duplicate directory
"/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/include-fixed"
ignoring nonexistent directory
"/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/../../../../x86_64-unknown-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/include
/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/../../../../include/c++/10.2.1
/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/../../../../include/c++/10.2.1/x86_64-unknown-linux-gnu
/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/../../../../include/c++/10.2.1/backward
/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/include
/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/include-fixed
/usr/local/include
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-std=c++17' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../libexec/gcc/x86_64-unknown-linux-gnu/10.2.1/cc1plus
-fpreprocessed m.ii -quiet -dumpbase m.cc -mtune=generic -march=x86-64 -auxbase
m -std=c++17 -version -fabi-version=0 -o m.s
GNU C++17 (GCC) version 10.2.1 20200803 (x86_64-unknown-linux-gnu)
compiled by GNU C version 10.2.1 20200803, GMP version 6.2.0, MPFR
version 4.0.2, MPC version 1.1.0, isl version isl-0.22-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C++17 (GCC) version 10.2.1 20200803 (x86_64-unknown-linux-gnu)
compiled by GNU C version 10.2.1 20200803, GMP version 6.2.0, MPFR
version 4.0.2, MPC version 1.1.0, isl version isl-0.22-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 1cbe278be5220506f693cd99f8934440
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-std=c++17' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/../../../../x86_64-unknown-linux-gnu/bin/as
-v --64 -o m.o m.s
GNU assembler version 2.32 (x86_64-unknown-linux-gnu) using BFD version (GNU
Binutils) 2.32
COMPILER_PATH=/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../libexec/gcc/x86_64-unknown-linux-gnu/10.2.1/:/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../libexec/gcc/:/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/:/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/../../../../x86_64-unknown-linux-gnu/bin/
LIBRARY_PATH=/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/:/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/:/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/../../../../x86_64-unknown-linux-gnu/lib/:/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-std=c++17' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../libexec/gcc/x86_64-unknown-linux-gnu/10.2.1/collect2
-plugin
/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../libexec/gcc/x86_64-unknown-linux-gnu/10.2.1/liblto_plugin.so
-plugin-opt=/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../libexec/gcc/x86_64-unknown-linux-gnu/10.2.1/lto-wrapper
-plugin-opt=-fresolution=m.res -plugin-opt=-pass-through=-lgcc_s
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lc
-plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc --build-id
--eh-frame-hdr --hash-style=gnu -m elf_x86_64 -dynamic-linker
/lib64/ld-linux-x86-64.so.2 -z common-page-size=4096 -z max-page-size=4096
/lib/../lib64/crt1.o /lib/../lib64/crti.o
/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/crtbegin.o
-L/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/10.2.1
-L/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc
-L/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/../../../../lib64
-L/lib/../lib64 -L/usr/lib/../lib64
-L/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/../../../../x86_64-unknown-linux-gnu/lib
-L/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/../../..
m.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc
/cvmfs/cms-ib.cern.ch/nweek-02661/slc7_amd64_gcc10/external/gcc/10.2.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/10.2.1/crtend.o
/lib/../lib64/crtn.o
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-std=c++17' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
