[jira] [Created] (XALANC-786) Compilation error with C++20 standard: cause by deleted operator<< in std::basic_ostream

["Laurent Stacul (Jira)" <ji...@apache.org>]

Laurent Stacul created XALANC-786:
-------------------------------------

             Summary: Compilation error with C++20 standard: cause by deleted operator<< in std::basic_ostream
                 Key: XALANC-786
                 URL: https://issues.apache.org/jira/browse/XALANC-786
             Project: XalanC
          Issue Type: Bug
          Components: XalanC, XPathC
    Affects Versions: 1.11
         Environment: Ubuntu 18.04 / SLES 12
            Reporter: Laurent Stacul
            Assignee: Gary D. Gregory


There is a compilation problem when building against the C++20 standard. I am using gcc 10.0.1 with the option -std=gnu++2a. This is due to the change described here (https://en.cppreference.com/w/cpp/io/basic_ostream/operator_ltlt2).

Here is the error message:
{code:java}
g++ -std=gnu++2a -fno-working-directory -ggdb3 -flto -ffat-lto-objects -fuse-linker-plugin -g -I/home/jenkins/workspace/htly-ncegcolnx338_release_20.0.0/workdir/components/xalan/DEPS/osp/ICU/uc/latest/osp/include -I/home/jenkins/workspace/htly-ncegcolnx338_release_20.0.0/workdir/components/xalan/DEPS/osp/ICU/i18n/latest/osp/include -I/home/jenkins/workspace/htly-ncegcolnx338_release_20.0.0/workdir/components/xalan/DEPS/osp/ICU/data/latest/osp/include -pthread -D_REENTRANT -fno-elide-constructors -Wall -fPIC -DLINUX -D_REENTRANT -DXALAN_INMEM_MSG_LOADER -c -I/home/jenkins/workspace/htly-ncegcolnx338_release_20.0.0/workdir/components/xalan/BUILD/xalan-c-1.11/c/src -I/home/jenkins/workspace/htly-ncegcolnx338_release_20.0.0/workdir/components/xalan/BUILD/xalan-c-1.11/c/include -I../nls/include -I/home/jenkins/workspace/htly-ncegcolnx338_release_20.0.0/workdir/components/xalan/DEPS/osp/Xerces/latest/osp/src/ -I/home/jenkins/workspace/htly-ncegcolnx338_release_20.0.0/workdir/components/xalan/DEPS/osp/Xerces/latest/osp/include/xercesc -I/home/jenkins/workspace/htly-ncegcolnx338_release_20.0.0/workdir/components/xalan/DEPS/osp/Xerces/latest/osp/include/ -o ../obj/Parameters.o /home/jenkins/workspace/htly-ncegcolnx338_release_20.0.0/workdir/components/xalan/BUILD/xalan-c-1.11/c/Tests/Performance/Parameters.cpp
In file included from /opt/1A/toolchain/x86_64-v20.0.8/include/c++/10.0.1/backward/strstream:50,
 from /home/jenkins/workspace/htly-ncegcolnx338_release_20.0.0/workdir/components/xalan/BUILD/xalan-c-1.11/c/src/xalanc/Harness/XalanFileUtility.hpp:32,
 from /home/jenkins/workspace/htly-ncegcolnx338_release_20.0.0/workdir/components/xalan/BUILD/xalan-c-1.11/c/Tests/Performance/Parameters.cpp:50:
/opt/1A/toolchain/x86_64-v20.0.8/include/c++/10.0.1/backward/backward_warning.h:32:2: warning: #warning This file includes at least one deprecated or antiquated header which may be removed without further notice at a future date. Please use a non-deprecated interface with equivalent functionality instead. For a listing of replacement headers and interfaces, consult the file backward_warning.h. To disable this warning use -Wno-deprecated. [-Wcpp]
 32 | #warning \
 | ^~~~~~~
In file included from /home/jenkins/workspace/htly-ncegcolnx338_release_20.0.0/workdir/components/xalan/BUILD/xalan-c-1.11/c/Tests/Performance/Parameters.hpp:39,
 from /home/jenkins/workspace/htly-ncegcolnx338_release_20.0.0/workdir/components/xalan/BUILD/xalan-c-1.11/c/Tests/Performance/Parameters.cpp:54:
/home/jenkins/workspace/htly-ncegcolnx338_release_20.0.0/workdir/components/xalan/BUILD/xalan-c-1.11/c/Tests/Performance/TestHarness.hpp: In member function 'void TestHarness<Processor>::executeTestCase(const TestCaseType&)':
/home/jenkins/workspace/htly-ncegcolnx338_release_20.0.0/workdir/components/xalan/BUILD/xalan-c-1.11/c/Tests/Performance/TestHarness.hpp:244:49: error: use of deleted function 'std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const char16_t*) [with _Traits = std::char_traits<char>]'
 244 | << testCase.inputMode.c_str()
 | ^
In file included from /opt/1A/toolchain/x86_64-v20.0.8/include/c++/10.0.1/istream:39,
 from /opt/1A/toolchain/x86_64-v20.0.8/include/c++/10.0.1/sstream:38,
 from /opt/1A/toolchain/x86_64-v20.0.8/include/c++/10.0.1/bits/quoted_string.h:38,
 from /opt/1A/toolchain/x86_64-v20.0.8/include/c++/10.0.1/iomanip:45,
 from /home/jenkins/workspace/htly-ncegcolnx338_release_20.0.0/workdir/components/xalan/BUILD/xalan-c-1.11/c/Tests/Performance/Parameters.cpp:26:
/opt/1A/toolchain/x86_64-v20.0.8/include/c++/10.0.1/ostream:645:5: note: declared here
 645 | operator<<(basic_ostream<char, _Traits>&, const char16_t*) = delete;
 | ^~~~~~~~{code}



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