New subject: [Bug 57337] wineg++ does not play well with libcxx 18.1.8 headers

Oct. 21, 2024

      https://bugs.winehq.org/show_bug.cgi?id=57337

            Bug ID: 57337
           Summary: wineg++ does not play well with libcxx 18.1.8 headers
           Product: Wine
           Version: 9.20
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: winelib
          Assignee: wine-bugs(a)winehq.org
          Reporter: zerica(a)callcc.eu
      Distribution: ---

Created attachment 77299
  --> https://bugs.winehq.org/attachment.cgi?id=77299
build log of `wineg++ hello.cpp`, where hello.cpp includes iostream

including iostream in any file that's being built through wineg++ confuses
libcxx if it's the main c++ stdlib implementation, since the latter supports
win32 as a proper target. for example, it tries to redefine locale_t in
https://github.com/llvm/llvm-project/blob/llvmorg-18.1.8/libcxx/include/__su...,
which conflicts with the definition in bits/alltypes (as the first error in the
attached log shows). that file is included from
https://github.com/llvm/llvm-project/blob/llvmorg-18.1.8/libcxx/include/__lo...,
which is guarded by a macro defined in
https://github.com/llvm/llvm-project/blob/llvmorg-18.1.8/libcxx/include/__co...,
which is likewise guarded by the _WIN32 define set by winegcc in
https://gitlab.winehq.org/wine/wine/-/blob/wine-9.20/tools/winegcc/winegcc.c....

those symbols are unconditionally passed to the c compiler by winegcc, so a
possible solution would be adding a flag that skips those definitions. that
would make working around these issues on a case by case basis possible.

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[Bug 57337] New: wineg++ does not play well with libcxx 18.1.8 headers

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