☰

error: no template named 'remove_cv_t' in namespace 'std'; did you mean 'remove_cv'? Ask Question

tag-icon • tag-icon node.js ruby-on-rails xcode yarnpkg node-sass
error: no template named 'remove_cv_t' in namespace 'std'; did you mean 'remove_cv'? Ask Question

My problem seems similar to this issue, except it happens when I run yarn install in a rails app.

When I run yarn install, it runs successfully for some time, then

../src/libsass/src/ast.hpp:1614:25: warning: loop variable 'numerator' of type 'const std::__1::basic_string<char>' creates a copy from type 'const std::__1::basic_string<char>' [-Wrange-loop-analysis]
        for (const auto numerator : numerators)
                        ^
../src/libsass/src/ast.hpp:1614:14: note: use reference type 'const std::__1::basic_string<char> &' to prevent copying
        for (const auto numerator : numerators)
             ^~~~~~~~~~~~~~~~~~~~~~
                        &
../src/libsass/src/ast.hpp:1616:25: warning: loop variable 'denominator' of type 'const std::__1::basic_string<char>' creates a copy from type 'const std::__1::basic_string<char>' [-Wrange-loop-analysis]
        for (const auto denominator : denominators)
                        ^
../src/libsass/src/ast.hpp:1616:14: note: use reference type 'const std::__1::basic_string<char> &' to prevent copying
        for (const auto denominator : denominators)
             ^~~~~~~~~~~~~~~~~~~~~~~~
                        &
2 warnings generated.
  rm -f Release/sass.a && ./gyp-mac-tool filter-libtool libtool  -static -o Release/sass.a Release/obj.target/libsass/src/libsass/src/ast.o Release/obj.target/libsass/src/libsass/src/ast_fwd_decl.o Release/obj.target/libsass/src/libsass/src/backtrace.o Release/obj.target/libsass/src/libsass/src/base64vlq.o Release/obj.target/libsass/src/libsass/src/bind.o Release/obj.target/libsass/src/libsass/src/cencode.o Release/obj.target/libsass/src/libsass/src/check_nesting.o Release/obj.target/libsass/src/libsass/src/color_maps.o Release/obj.target/libsass/src/libsass/src/constants.o Release/obj.target/libsass/src/libsass/src/context.o Release/obj.target/libsass/src/libsass/src/cssize.o Release/obj.target/libsass/src/libsass/src/emitter.o Release/obj.target/libsass/src/libsass/src/environment.o Release/obj.target/libsass/src/libsass/src/error_handling.o Release/obj.target/libsass/src/libsass/src/eval.o Release/obj.target/libsass/src/libsass/src/expand.o Release/obj.target/libsass/src/libsass/src/extend.o Release/obj.target/libsass/src/libsass/src/file.o Release/obj.target/libsass/src/libsass/src/functions.o Release/obj.target/libsass/src/libsass/src/inspect.o Release/obj.target/libsass/src/libsass/src/json.o Release/obj.target/libsass/src/libsass/src/lexer.o Release/obj.target/libsass/src/libsass/src/listize.o Release/obj.target/libsass/src/libsass/src/memory/SharedPtr.o Release/obj.target/libsass/src/libsass/src/node.o Release/obj.target/libsass/src/libsass/src/operators.o Release/obj.target/libsass/src/libsass/src/output.o Release/obj.target/libsass/src/libsass/src/parser.o Release/obj.target/libsass/src/libsass/src/plugins.o Release/obj.target/libsass/src/libsass/src/position.o Release/obj.target/libsass/src/libsass/src/prelexer.o Release/obj.target/libsass/src/libsass/src/remove_placeholders.o Release/obj.target/libsass/src/libsass/src/sass.o Release/obj.target/libsass/src/libsass/src/sass2scss.o Release/obj.target/libsass/src/libsass/src/sass_context.o Release/obj.target/libsass/src/libsass/src/sass_functions.o Release/obj.target/libsass/src/libsass/src/sass_util.o Release/obj.target/libsass/src/libsass/src/sass_values.o Release/obj.target/libsass/src/libsass/src/source_map.o Release/obj.target/libsass/src/libsass/src/subset_map.o Release/obj.target/libsass/src/libsass/src/to_c.o Release/obj.target/libsass/src/libsass/src/to_value.o Release/obj.target/libsass/src/libsass/src/units.o Release/obj.target/libsass/src/libsass/src/utf8_string.o Release/obj.target/libsass/src/libsass/src/util.o Release/obj.target/libsass/src/libsass/src/values.o
  c++ '-DNODE_GYP_MODULE_NAME=binding' '-DUSING_UV_SHARED=1' '-DUSING_V8_SHARED=1' '-DV8_DEPRECATION_WARNINGS=1' '-DV8_DEPRECATION_WARNINGS' '-DV8_IMMINENT_DEPRECATION_WARNINGS' '-D_GLIBCXX_USE_CXX11_ABI=1' '-D_DARWIN_USE_64_BIT_INODE=1' '-D_LARGEFILE_SOURCE' '-D_FILE_OFFSET_BITS=64' '-DBUILDING_NODE_EXTENSION' -I/Users/st/.node-gyp/16.0.0/include/node -I/Users/st/.node-gyp/16.0.0/src -I/Users/st/.node-gyp/16.0.0/deps/openssl/config -I/Users/st/.node-gyp/16.0.0/deps/openssl/openssl/include -I/Users/st/.node-gyp/16.0.0/deps/uv/include -I/Users/st/.node-gyp/16.0.0/deps/zlib -I/Users/st/.node-gyp/16.0.0/deps/v8/include -I../../nan -I../src/libsass/include  -O3 -gdwarf-2 -mmacosx-version-min=10.7 -arch x86_64 -Wall -Wendif-labels -W -Wno-unused-parameter -std=c++11 -stdlib=libc++ -fno-rtti -fno-exceptions -fno-strict-aliasing -MMD -MF ./Release/.deps/Release/obj.target/binding/src/binding.o.d.raw   -c -o Release/obj.target/binding/src/binding.o ../src/binding.cpp
In file included from ../src/binding.cpp:1:
In file included from ../../nan/nan.h:56:
In file included from /Users/st/.node-gyp/16.0.0/include/node/node.h:63:
In file included from /Users/st/.node-gyp/16.0.0/include/node/v8.h:30:
/Users/st/.node-gyp/16.0.0/include/node/v8-internal.h:452:38: error: no template named 'remove_cv_t' in namespace 'std'; did you mean 'remove_cv'?
            !std::is_same<Data, std::remove_cv_t<T>>::value>::Perform(data);
                                ~~~~~^~~~~~~~~~~
                                     remove_cv
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/type_traits:697:50: note: 'remove_cv' declared here
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_cv
                                                 ^
1 error generated.
make: *** [Release/obj.target/binding/src/binding.o] Error 1
gyp ERR! build error 
gyp ERR! stack Error: `make` failed with exit code: 2
gyp ERR! stack     at ChildProcess.onExit (/Users/st/rails/myapp/node_modules/node-gyp/lib/build.js:262:23)
gyp ERR! stack     at ChildProcess.emit (node:events:365:28)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (node:internal/child_process:290:12)
gyp ERR! System Darwin 20.3.0
gyp ERR! command "/usr/local/Cellar/node/16.0.0/bin/node" "/Users/st/rails/myapp/node_modules/node-gyp/bin/node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
gyp ERR! cwd /Users/st/rails/myapp/node_modules/node-sass
gyp ERR! node -v v16.0.0
gyp ERR! node-gyp -v v3.8.0
gyp ERR! not ok

Any ideas how to solve this? (I'm not even sure if it's a problem with xcode/node/rails/c++)

Other notes

  • /usr/bin/xcodebuild -version returns
Xcode 12.4
Build version 12D4e
  • cpp --version returns
Apple clang version 12.0.0 (clang-1200.0.32.29)
Target: x86_64-apple-darwin20.3.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Please note: I don't code in cpp, so I have very little contextual knowledge of how to solve.

ベストアンサー1

Update: Since node-sass version 6.0.1, Node 16 is supported. Updating node-sass to a version in the 6.x range solves this issue for Node 16. For other Node versions, the node-sass readme has a compatibility table for which versions of Node SASS are compatible with which versions of Node.

What you're seeing is an error during compilation of node-sass. That's a package processing your Sass/SCSS styles, which is written in C++ and only re-packaged as a JavaScript library. The fact it's written in C++ means it needs to be compiled on your device during installation (this is internally done by a tool called node-gyp, which you can spot in your error output, too).

The problem is node-sass doesn't support Node 16 as of writing this answer, see tracking issue: https://github.com/sass/node-sass/issues/3077 There's no estimate on when it's gonna support it (and that's fair, as it's a volunteer-driven project). Even if you manage to install node-sass on Node 16, I'd advice against it, as the behavior might be undefined.

The correct solution is to downgrade your Node installation to a supported version (I can see both 14 and 15 tested in their CI). If you git cloned a project and it won't install on your machine, but works for your colleagues or on the production server, it's likely the project has a different version of Node in mind too, and isn't tested on Node 16, so I'd advice against developing it on Node 16 anyway. If the project worked for you just a few days ago, but it doesn't work now, it's very likely you recently upgraded your system setup (e.g. Homebrew), which upgraded you to Node 16 (this is what happened to me and how I found this question).

プロジェクトの作者に、Nodeのプロダクションサーバーバージョンが何であるかを確認し、そのバージョンをローカルにもインストールする必要があります。ベストプラクティスとして、将来的には、プロダクションバージョンとローカルバージョンのNode（およびyarnまたはnpm）を同期させておくことをお勧めします。複数のNodeバージョンを管理するには、このツールを使用できます。https://github.com/nvm-sh/nvm

おすすめ記事