unexpected std::io_base::failure exception [duplicate] - c++

Question

This question already has an answer here:
Unexpected exception in std::ifstream
(1 answer)
Closed 7 years ago.
Take this simple program:
#include <fstream>
int main()
{
std::ifstream in(".");
int x;
if (in)
in >> x;
}
on Redhat 6, gcc 4.4.7 this runs without error
on Ubuntu 14.04 LTS , gcc 4.8.2 this runs without error
on Redhat 7, gcc 4.8.2 I get:
terminate called after throwing an instance of 'std::ios_base::failure'
what(): basic_filebuf::underflow error reading the file
Aborted (cored dumped)
I think this is related to:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53984
However, then I don't understand why it works on Ubuntu.
Ideas?

Answer 1

The difference isn't the compiler, the difference is the C++ library. One of them has a buggy version of libstdc++, and the other has a working version of either libstdc++ or libc++ or another version.

Answer 2

I've just tested on my Trusty Tahr system. It blows up, just as on Red Hat. So it doesn't "work on Ubuntu".
To verify we're both getting the same results, here's the output of various commands I've used:
cky#sunflower:~/tmp$ g++ -O2 -Wall -o test test.cc
cky#sunflower:~/tmp$ ./test
terminate called after throwing an instance of 'std::ios_base::failure'
what(): basic_filebuf::underflow error reading the file
Aborted (core dumped)
cky#sunflower:~/tmp$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.8.2-19ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.8 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)
cky#sunflower:~/tmp$ dpkg -l libstdc++\*
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-======================================-========================-========================-==================================================================================
ii libstdc++-4.8-dev:amd64 4.8.2-19ubuntu1 amd64 GNU Standard C++ Library v3 (development files)
un libstdc++-4.8-doc <none> <none> (no description available)
un libstdc++-dev <none> <none> (no description available)
un libstdc++2.10-dev <none> <none> (no description available)
un libstdc++2.8-dev <none> <none> (no description available)
un libstdc++2.9-dev <none> <none> (no description available)
un libstdc++2.9-glibc2.1-dev <none> <none> (no description available)
un libstdc++3.0-dev <none> <none> (no description available)
ii libstdc++6:amd64 4.8.2-19ubuntu1 amd64 GNU Standard C++ Library v3
un libstdc++6-4.8-dbg <none> <none> (no description available)