From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 9138 invoked by alias); 6 Sep 2013 16:48:50 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 9108 invoked by uid 48); 6 Sep 2013 16:48:46 -0000 From: "hstong at ca dot ibm.com" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/58337] New: Mangling of nullptr_t values do not follow ABI Date: Fri, 06 Sep 2013 16:48:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c++ X-Bugzilla-Version: 4.8.1 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: hstong at ca dot ibm.com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2013-09/txt/msg00382.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58337 Bug ID: 58337 Summary: Mangling of nullptr_t values do not follow ABI Product: gcc Version: 4.8.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: hstong at ca dot ibm.com The C++ ABI document (available at http://mentorembedded.github.io/cxx-abi/abi.html#mangle.expr-primary) specifies a mangling for the nullptr literal. The mangling that GCC produces is not consistent with the form specified by the ABI; namely, "LDn0E" is generated by GCC instead of "LDnE". ICC mangles using the ABI-specified form: "LDnE". Note that nullptr_t is not an integer type. It is contrary to the specification to apply the production for integer literals to a literal of type nullptr_t. ### SMALL SOURCE (main.cpp): typedef decltype(nullptr) NullPtrType; template void foo(); template <> void foo() { } ### ACTUAL MANGLED NAME: > g++-4.8 -std=c++11 -c main.cpp -o main.o && nm main.o 0000000000000000 T _Z3fooILDn0EEvv ### EXPECTED MANGLED NAME: _Z3fooILDnEEvv ### g++ -v: > g++-4.8 -v Using built-in specs. COLLECT_GCC=g++-4.8 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 4.8.1-2ubuntu1~12.04' --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 --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 --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 4.8.1 (Ubuntu 4.8.1-2ubuntu1~12.04)