Subject: [Boost-bugs] [Boost C++ Libraries] #11989: gcc 5.3 optimizer mangles non_blocking_recvfrom
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2016-02-16 12:48:22
#11989: gcc 5.3 optimizer mangles non_blocking_recvfrom
------------------------------+----------------------------
Reporter: tmark@⦠| Owner: chris_kohlhoff
Type: Bugs | Status: new
Milestone: To Be Determined | Component: asio
Version: Boost 1.58.0 | Severity: Optimization
Keywords: |
------------------------------+----------------------------
Our Kea project uses boost::asio. When compiled with gcc 5.3.1 and -O2,
the optimizer is incorrectly removing tests, against a variable which can
be changed, from one of the boost::asio functions.
The affected function is:
{{{
bool non_blocking_recvfrom(socket_type s,
buf* bufs, size_t count, int flags,
socket_addr_type* addr, std::size_t* addrlen,
boost::system::error_code& ec, size_t& bytes_transferred)
}}}
in the file:
/usr/include/boost/asio/detail/impl/socket_ops.ipp
where the tests for "ec" shown below are optmized out:
{{{
:
// Retry operation if interrupted by signal.
if (ec == boost::asio::error::interrupted)
continue;
// Check if we need to run the operation again.
if (ec == boost::asio::error::would_block
|| ec == boost::asio::error::try_again)
return false;
:
}}}
This causes the function to always return true.
I have also opened a ticket with the good people at GCC, ticket #69789.
This occurred with Boost 1.58, though I suspect the issue is present in
1.60 as the code for the function appears to be unchanged.
Additional information:
1. gcc --version output:
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/5.3.1/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap --enable-
languages=c,c++,objc,obj-c++,fortran,ada,go,lto --prefix=/usr
--mandir=/usr/share/man --infodir=/usr/share/info --enable-shared
--enable-threads=posix --enable-checking=release --enable-multilib --with-
system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-
gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu
--enable-plugin --enable-initfini-array --disable-libgcj --with-isl
--enable-libmpx --enable-gnu-indirect-function --with-tune=generic --with-
arch_32=i686 --build=x86_64-redhat-linux
Thread model: posix
gcc version 5.3.1 20151207 (Red Hat 5.3.1-2) (GCC)
2. OS info:
Linux fedora23-64-1 4.3.4-300.fc23.x86_64 #1 SMP Mon Jan 25 13:39:23 UTC
2016 x86_64 x86_64 x86_64 GNU/Linux
3. Compiler command line:
g++ -DHAVE_CONFIG_H -I. -I../../../.. -I../../../../src/lib
-I../../../../src/lib -DTEST_DATA_DIR=\"./testdata\"
-I/opt/gtest/gtest-1.7.0 -I/opt/gtest/gtest-1.7.0/include -DOS_LINUX
-I../../../../ext/coroutine -DBOOST_ASIO_HEADER_ONLY
-DBOOST_ASIO_DISABLE_THREADS=1 -DBOOST_ERROR_CODE_HEADER_ONLY
-DBOOST_SYSTEM_NO_DEPRECATED -Wall -Wextra -Wnon-virtual-dtor -Wwrite-
strings -Woverloaded-virtual -Wno-sign-compare -pthread -Werror -fPIC
-Wno-missing-field-initializers -Wno-unused-parameter -g -O2 -save-temps
-MT run_unittests-udp_socket_unittest.o -MD -MP -MF .deps/run_unittests-
udp_socket_unittest.Tpo -c -o run_unittests-udp_socket_unittest.o `test -f
'udp_socket_unittest.cc' || echo './'`udp_socket_unittest.cc
-- Ticket URL: <https://svn.boost.org/trac/boost/ticket/11989> Boost C++ Libraries <http://www.boost.org/> Boost provides free peer-reviewed portable C++ source libraries.
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