Re: Updating from 1_71_0 to 1_85_0: "No member named 'memcpy' in namespace 'std::__1'"

From: Richard Hodges (hodges.r_at_[hidden])
Date: 2024-07-11 07:43:01

This usually happens because you're compiling with one standard library
(e.g. libc++, the default on clang) while your boost libraries were
compiled with another (e.g. libstdc++, the default on gcc).

R

On Thu, 11 Jul 2024 at 02:21, Stephen Greenfield via Boost <
boost_at_[hidden]> wrote:

> Dear Boost gurus,
>
> Building on MacOS 12.7.3, Xcode 13.4.1, C++ dialect = C++17.  Deployment
> target is 10.15.  This particular project is x86_64 architecture.  I’m only
> linking libboost_filesystem.a and libboost_iostreams.a (I show my build
> boost build steps at the end).
>
> When updating from Boost 1_71_0 to 1_85_0, I’m suddenly encountering these
> kinds of errors:
>
>
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk/usr/include/c++/v1/__functional/hash.h:40:5:
> No member named 'memcpy' in namespace 'std::__1'; did you mean simply
> 'memcpy'?
>
>
> /Users/stephen/dev/Boost
> Libraries/boost_1_85_0/boost/system/detail/append_int.hpp:23:5: No member
> named 'snprintf' in namespace 'boost::system::detail'; did you mean simply
> 'snprintf'?
>
>
>
>
> In file included from
> /Users/stephen/dev/Screenwriter/ScreenWriterX/ScreenWriterX/Screenwriter
> Sources/Text Engine/CThingEdit.cp:22:
>
> In file included from ../ScreenWriterX/ScreenWriterX/Screenwriter
> Sources/Text Engine/CThingEdit.h:61:
>
> In file included from
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk/usr/include/c++/v1/string:522:
>
> In file included from
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk/usr/include/c++/v1/algorithm:653:
>
> In file included from
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk/usr/include/c++/v1/functional:500:
>
> In file included from
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk/usr/include/c++/v1/__functional/function.h:20:
>
> In file included from
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk/usr/include/c++/v1/__memory/shared_ptr.h:25:
>
> In file included from
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk/usr/include/c++/v1/__memory/unique_ptr.h:15:
>
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk/usr/include/c++/v1/__functional/hash.h:40:5:
> error: no member named 'memcpy' in namespace 'std::__1'; did you mean
> simply 'memcpy'?
>
>     _VSTD::memcpy(&__r, __p, sizeof(__r));
>
>     ^~~~~~~
>
> In file included from <built-in>:1:
>
> In file included from
> /Users/stephen/dev/Screenwriter/ScreenWriterX/ScreenWriterX/Screenwriter
> Sources/Screenwriter_Prefix.pch:505:
>
> In file included from
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk/usr/include/MacTypes.h:44:
>
> In file included from
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk/usr/include/c++/v1/stdbool.h:22:
>
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk/usr/include/c++/v1/__config:858:15:
> note: expanded from macro '_VSTD'
>
> #define _VSTD std::_LIBCPP_ABI_NAMESPACE
>
>               ^
>
> In file included from
> /Users/stephen/dev/Screenwriter/ScreenWriterX/ScreenWriterX/Screenwriter
> Sources/Text Engine/CThingEdit.cp:22:
>
> In file included from ../ScreenWriterX/ScreenWriterX/Screenwriter
> Sources/Text Engine/CThingEdit.h:61:
>
> In file included from
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk/usr/include/c++/v1/string:522:
>
> In file included from
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk/usr/include/c++/v1/algorithm:652:
>
> /Users/stephen/dev/Boost
> Libraries/boost_1_85_0/boost/compatibility/cpp_c_headers/cstring:22:11:
> note: 'memcpy' declared here
>
>   using ::memcpy;
>
>           ^
> …this is for all sorts of symbols.  ALSO:
>
>
>
>
> Showing All Errors Only
>
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk/usr/include/c++/v1/filesystem:2635:5:
> Use of undeclared identifier '_LIBCPP_UNREACHABLE'
>
>
> When including:
>
> #include <fstream>
>
>
> The libraries were build using:
>
> ./bootstrap.sh cxxflags="-arch x86_64 -arch arm64" cflags="-arch x86_64
> -arch arm64" linkflags="-arch x86_64 -arch arm64"
>
> ./b2 toolset=clang-darwin target-os=darwin architecture=arm abi=aapcs
> cxxflags="-arch arm64" cflags="-arch arm64" linkflags="-arch arm64" -a
>
> mkdir -p arm64 && cp stage/lib/*.* arm64
>
> ./b2 toolset=clang-darwin target-os=darwin architecture=x86
> cxxflags="-arch x86_64" cflags="-arch x86_64" linkflags="-arch x86_64"
> abi=sysv binary-format=mach-o -a
>
> mkdir x86_64 && cp stage/lib/*.* x86_64
>
> The intention was for me to eventually make UNIVERSAL dylibs using lipo –
> but for now, I just want to get my build back to functioning with Boost
> 1_85_0.
>
> NOTE that I’m continuing to use Boost’s Filesystem – even though I THINK
> Xcode’s C++20 might now support std::filesystem.
>
> I’ve searched all over for the answer – even consulted ChatGPT – but
> haven’t found a solution.  But this seems like something bone-headed I’ve
> missed.
>
> Stephen
>
> _______________________________________________
> Unsubscribe & other changes:
> http://lists.boost.org/mailman/listinfo.cgi/boost
>