From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 17443 invoked by alias); 22 Apr 2015 10:03:14 -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 17400 invoked by uid 48); 22 Apr 2015 10:03:09 -0000 From: "darklin20 at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/65843] New: multiple use of const variable in lamba in template function causes compile error Date: Wed, 22 Apr 2015 10:03:00 -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: 5.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: major X-Bugzilla-Who: darklin20 at gmail dot 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: 2015-04/txt/msg01794.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65843 Bug ID: 65843 Summary: multiple use of const variable in lamba in template function causes compile error Product: gcc Version: 5.0 Status: UNCONFIRMED Severity: major Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: darklin20 at gmail dot com The source code in next report is completely valid source code but GCC 5.0.0 rejects to compile it. Older version of GCC can compile this. I tested this in Ubuntu but I've got the same report in fedora from other user. If I change the type of varaible 'a' to int from const int, or make the test function non-template, it can be compiled. ------------------------------------------------------------------------------- the exact version of GCC 5.0.0 20150329 (experimental) [trunk revision 221764] (Ubuntu 5-20150329-1ubuntu11~14.04) the system type x86_64-linux-gnu the options given when GCC was configured/built Configured with: ../src/configure -v --with-pkgversion='Ubuntu 5-20150329-1ubuntu11~14.04' --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs --enable-languages=c,ada,c++,java,go,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-5 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/5 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=c++98 --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --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-5-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-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 --enable-multilib --with-tune=generic --enable-checking=yes --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu the complete command line that triggers the bug g++-5 -std=c++11 test.cpp the compiler output (error messages, warnings, etc.) test.cpp: In instantiation of 'test(T):: [with T = int]': test.cpp:5:7: required from 'struct test(T) [with T = int]::' test.cpp:5:28: required from 'void test(T) [with T = int]' test.cpp:9:11: required from here test.cpp:5:27: error: redeclaration of 'const int& a' [&] () { return a, a; }(); ^ test.cpp:5:27: note: 'const int& a' previously declared here test.cpp: In instantiation of 'void test(T) [with T = int]': test.cpp:9:11: required from here test.cpp:5:5: sorry, unimplemented: non-trivial designated initializers not supported [&] () { return a, a; }(); the preprocessed file (*.i*) that triggers the bug # 1 "test.cpp" # 1 "" # 1 "" # 1 "/usr/include/stdc-predef.h" 1 3 4 # 1 "" 2 # 1 "test.cpp" template void test(T b) { const int a = b; [&] () { return a, a; }(); } int main() { test(1); return 0; }