https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70996
Bug ID: 70996
Summary: deadlock on compilation sequence of operator<<
Product: gcc
Version: 6.1.1
Status: UNCONFIRMED
Severity: critical
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: magum1977 at gmail dot com
Target Milestone: ---
Created attachment 38434
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38434&action=edit
compilation of this src is endless
Code like below
error() << "call() wrong id got:" << hex << (unsigned)op2()
<< " expect:" << (unsigned)op3() << '\n'
<< dec
<< " toSend op: " << (unsigned)op() << '\n'
<< " response msgid:" << (unsigned)op2() << '\n'
<< " response len: " << (unsigned)op3() << '\n'
<< " response op: " << op4() << '\n'
<< endl;
with logger class which implement several overrided operator<<
leads to infinite compilation.
during infinite compilation cc1plus takes about 8% CPU.
see src example in attach
i compile it in c++98 mode with following options:
g++ -pipe -c -msse2 -m64 -MD -Wno-trigraphs -Wno-multichar -Wformat
-Wno-format-extra-args -ffunction-sections -fdata-sections
-fno-omit-frame-pointer -ffast-math -ffinite-math-only -minline-all-stringops
-std=c++98 -fconserve-space -Wno-invalid-offsetof -I /usr/include -g
-fstack-protector -fexceptions -Wreturn-type -Werror -pthread -o message_port.o
../../prog/3rdPartyLibs/mongo-cxx-driver/mongo/util/net/message_port_test.cpp
% gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/6.1.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib
--libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --enable-libmpx --with-system-zlib --with-isl
--enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu
--disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object
--enable-linker-build-id --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu
--enable-gnu-indirect-function --disable-multilib --disable-werror
--enable-checking=release
Thread model: posix
gcc version 6.1.1 20160501 (GCC)
