mongodb @4.0.7: build fails with C++ library issues using Xcode 10.2

[dbevans (David B. Evans)]

Build fails on macOS 10.14.4 using

Xcode 10.2
Build version 10E125
Apple LLVM version 10.0.1 (clang-1001.0.46.3)

as follows (no problem with Xcode 10.1)

:info:build /usr/bin/clang++ -o build/MP/mongo/transport/transport_layer.o -c -Woverloaded-virtual -Werror=unused-result -Wpessimizing-move -Wredundant-move -Wno-undefined-var-template -Wno-instantiation-after-specialization -stdlib=libc++ -std=c++14 -arch x86_64 -isysroot/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk -fno-omit-frame-pointer -fno-strict-aliasing -ggdb -pthread -Wall -Wsign-compare -Wno-unknown-pragmas -Winvalid-pch -O2 -Wno-unused-local-typedefs -Wno-unused-function -Wno-unused-private-field -Wno-deprecated-declarations -Wno-tautological-constant-out-of-range-compare -Wno-tautological-constant-compare -Wno-tautological-unsigned-zero-compare -Wno-tautological-unsigned-enum-zero-compare -Wno-unused-const-variable -Wno-missing-braces -Wno-inconsistent-missing-override -Wno-potentially-evaluated-expression -Wno-unused-lambda-capture -Wno-exceptions -Wunguarded-availability -fstack-protector-strong -fno-builtin-memcmp -DPCRE_STATIC -DNDEBUG -DBOOST_SYSTEM_NO_DEPRECATED -DBOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS -Isrc/third_party/pcre-8.41 -Isrc/third_party/boost-1.60.0 -I/opt/local/include -Ibuild/MP -Isrc src/mongo/transport/transport_layer.cpp
:info:build In file included from src/mongo/transport/transport_layer_asio.cpp:37:
:info:build In file included from src/third_party/asio-master/asio/include/asio.hpp:21:
:info:build In file included from src/third_party/asio-master/asio/include/asio/basic_datagram_socket.hpp:20:
:info:build In file included from src/third_party/asio-master/asio/include/asio/basic_socket.hpp:40:
:info:build In file included from src/third_party/asio-master/asio/include/asio/detail/reactive_socket_service.hpp:22:
:info:build In file included from src/third_party/asio-master/asio/include/asio/buffer.hpp:27:
:info:build In file included from src/third_party/asio-master/asio/include/asio/detail/string_view.hpp:23:
:info:build /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/experimental/string_view:11:2: error: "<experimental/string_view> has been removed. Use <string_view> instead."
:info:build #error "<experimental/string_view> has been removed. Use <string_view> instead."
:info:build  ^
:info:build In file included from src/mongo/transport/transport_layer_asio.cpp:37:
:info:build In file included from src/third_party/asio-master/asio/include/asio.hpp:21:
:info:build In file included from src/third_party/asio-master/asio/include/asio/basic_datagram_socket.hpp:20:
:info:build In file included from src/third_party/asio-master/asio/include/asio/basic_socket.hpp:40:
:info:build In file included from src/third_party/asio-master/asio/include/asio/detail/reactive_socket_service.hpp:22:
:info:build In file included from src/third_party/asio-master/asio/include/asio/buffer.hpp:27:
:info:build src/third_party/asio-master/asio/include/asio/detail/string_view.hpp:31:12: error: no member named 'experimental' in namespace 'std'
:info:build using std::experimental::basic_string_view;
:info:build       ~~~~~^
:info:build src/third_party/asio-master/asio/include/asio/detail/string_view.hpp:32:12: error: no member named 'experimental' in namespace 'std'
:info:build using std::experimental::string_view;
:info:build       ~~~~~^

[dbevans (David B. Evans)]

Build log showing failure

[ryandesign (Ryan Carsten Schmidt)]

Has anybody reported this problem to the developers of mongodb? If not, please do, and paste the URL here so we can check on it later. This problem is unlikely to be specific to MacPorts or macOS.

[jmroot (Joshua Root)]

Seems to already be fixed in the 4.1 development series: ​https://github.com/mongodb/mongo/commit/0c6f72ea1828b9dbbcc86e61d04e1f925ca870fc

Looks like FreeBSD's fix might work in the meantime: ​https://svnweb.freebsd.org/ports/head/databases/mongodb40/files/patch-asio-libc%2B%2B7?revision=494401&view=markup

[ryandesign (Ryan Carsten Schmidt)]

In 39aa1ce08d628a963202013de560c530747e9b4a/macports-ports (master):

mongodb: Fix build with Xcode 10.2

Closes: #58277