[英]C++: error: no member named 'signbit' in the global namespace
TL；DR： #include <cmath>標頭在嘗試編譯時no member named 'signbit' in the global space
目標：編譯一個純 C++ gRPC 客戶端-服務器應用程序
錯誤：
g++ -std=c++17 client.cpp mathtest.pb.cc mathtest.grpc.pb.cc -o client `pkg-config --libs --cflags protobuf grpc++`
In file included from client.cpp:3:
In file included from /opt/homebrew/Cellar/grpc/1.41.1/include/grpc++/grpc++.h:26:
In file included from /opt/homebrew/Cellar/grpc/1.41.1/include/grpcpp/grpcpp.h:52:
In file included from /opt/homebrew/Cellar/grpc/1.41.1/include/grpcpp/channel.h:28:
In file included from /opt/homebrew/Cellar/grpc/1.41.1/include/grpcpp/impl/codegen/completion_queue.h:45:
In file included from /opt/homebrew/Cellar/grpc/1.41.1/include/grpcpp/impl/codegen/sync.h:32:
In file included from /opt/homebrew/Cellar/abseil/20210324.2_1/include/absl/synchronization/mutex.h:72:
In file included from /opt/homebrew/Cellar/abseil/20210324.2_1/include/absl/synchronization/internal/kernel_timeout.h:34:
In file included from /opt/homebrew/Cellar/abseil/20210324.2_1/include/absl/time/clock.h:26:
In file included from /opt/homebrew/Cellar/abseil/20210324.2_1/include/absl/time/time.h:78:
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:321:9: error: no member named 'signbit' in the global namespace
using ::signbit;
~~^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:322:9: error: no member named 'fpclassify' in the global namespace
using ::fpclassify;
~~^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:323:9: error: no member named 'isfinite' in the global namespace
using ::isfinite;
~~^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:324:9: error: no member named 'isinf' in the global namespace
using ::isinf;
~~^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:325:9: error: no member named 'isnan' in the global namespace
using ::isnan;
~~^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:326:9: error: no member named 'isnormal' in the global namespace
using ::isnormal;
~~^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:327:7: error: no member named 'isgreater' in the global namespace; did you mean '::std::greater'?
using ::isgreater;
^~
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/functional:742:29: note: '::std::greater' declared here
struct _LIBCPP_TEMPLATE_VIS greater : binary_function<_Tp, _Tp, bool>
^
In file included from client.cpp:3:
In file included from /opt/homebrew/Cellar/grpc/1.41.1/include/grpc++/grpc++.h:26:
In file included from /opt/homebrew/Cellar/grpc/1.41.1/include/grpcpp/grpcpp.h:52:
In file included from /opt/homebrew/Cellar/grpc/1.41.1/include/grpcpp/channel.h:28:
In file included from /opt/homebrew/Cellar/grpc/1.41.1/include/grpcpp/impl/codegen/completion_queue.h:45:
In file included from /opt/homebrew/Cellar/grpc/1.41.1/include/grpcpp/impl/codegen/sync.h:32:
In file included from /opt/homebrew/Cellar/abseil/20210324.2_1/include/absl/synchronization/mutex.h:72:
In file included from /opt/homebrew/Cellar/abseil/20210324.2_1/include/absl/synchronization/internal/kernel_timeout.h:34:
In file included from /opt/homebrew/Cellar/abseil/20210324.2_1/include/absl/time/clock.h:26:
In file included from /opt/homebrew/Cellar/abseil/20210324.2_1/include/absl/time/time.h:78:
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:328:7: error: no member named 'isgreaterequal' in the global namespace; did you mean '::std::greater_equal'?
using ::isgreaterequal;
^~
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/functional:771:29: note: '::std::greater_equal' declared here
struct _LIBCPP_TEMPLATE_VIS greater_equal : binary_function<_Tp, _Tp, bool>
^
In file included from client.cpp:3:
In file included from /opt/homebrew/Cellar/grpc/1.41.1/include/grpc++/grpc++.h:26:
In file included from /opt/homebrew/Cellar/grpc/1.41.1/include/grpcpp/grpcpp.h:52:
In file included from /opt/homebrew/Cellar/grpc/1.41.1/include/grpcpp/channel.h:28:
In file included from /opt/homebrew/Cellar/grpc/1.41.1/include/grpcpp/impl/codegen/completion_queue.h:45:
In file included from /opt/homebrew/Cellar/grpc/1.41.1/include/grpcpp/impl/codegen/sync.h:32:
In file included from /opt/homebrew/Cellar/abseil/20210324.2_1/include/absl/synchronization/mutex.h:72:
In file included from /opt/homebrew/Cellar/abseil/20210324.2_1/include/absl/synchronization/internal/kernel_timeout.h:34:
In file included from /opt/homebrew/Cellar/abseil/20210324.2_1/include/absl/time/clock.h:26:
In file included from /opt/homebrew/Cellar/abseil/20210324.2_1/include/absl/time/time.h:78:
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:329:9: error: no member named 'isless' in the global namespace
using ::isless;
~~^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:330:9: error: no member named 'islessequal' in the global namespace
using ::islessequal;
~~^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:331:9: error: no member named 'islessgreater' in the global namespace
using ::islessgreater;
~~^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:332:9: error: no member named 'isunordered' in the global namespace
using ::isunordered;
~~^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:333:9: error: no member named 'isunordered' in the global namespace
using ::isunordered;
~~^
這只是正在出現的其他內容的一小部分。 cmath 還有一些錯誤，但我認為一旦實施解決方案，大部分（如果不是全部）將被清除。
我試過的：
#Check the current sdk
xcrun --show-sdk-path
#Change sdk
sudo xcode-select -s /Library/Developer/CommandLineTools #Using CommandLineTools SDK
sudo xcode-select -s /Applications/Xcode.app/Contents/Developer #Using XCode.app SDK
修復：
如果我們可以先把#include<...>的搜索順序改為搜索>/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/inclu>de/c++/v1，可以是固定的。
在 /Applications/Xcode.app/Contents/ 中使用 #include</Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h> 而不是 <math.h>開發者/工具鏈/XcodeDefault.xctoolchain/usr/include/c++/v1/cmath
-isysroot /sdk/path標志（下面的完整命令） g++ -std=c++17 client.cpp mathtest.pb.cc mathtest.grpc.pb.cc -o client -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk 'pkg-config --libs --cflags protobuf grpc++'
配置：
,xNMM. ---------------------------------
.OMMMMo OS: macOS 12.0.1 21A559 arm64
OMMM0, Host: MacBookPro18,3
.;loddo:' loolloddol;. Kernel: 21.1.0
cKMMMMMMMMMMNWMMMMMMMMMM0: Uptime: 12 days, 22 hours, 41 mins
.KMMMMMMMMMMMMMMMMMMMMMMMWd. Packages: 53 (brew)
XMMMMMMMMMMMMMMMMMMMMMMMX. Shell: zsh 5.8
;MMMMMMMMMMMMMMMMMMMMMMMM: Resolution: 1512x982
:MMMMMMMMMMMMMMMMMMMMMMMM: DE: Aqua
.MMMMMMMMMMMMMMMMMMMMMMMMX. WM: Quartz Compositor
kMMMMMMMMMMMMMMMMMMMMMMMMWd. WM Theme: Blue (Dark)
.XMMMMMMMMMMMMMMMMMMMMMMMMMMk Terminal: iTerm2
.XMMMMMMMMMMMMMMMMMMMMMMMMK. Terminal Font: Monaco 12
kMMMMMMMMMMMMMMMMMMMMMMd CPU: Apple M1 Pro
;KMMMMMMMWXXWMMMMMMMk. GPU: Apple M1 Pro
.cooc,. .,coo:. Memory: 3551MiB / 32768MiB
不完全確定我還能找到什么。 從我所做的幾個小時的研究來看，這似乎是 MacOS 問題，而不是配置/設置問題。 任何幫助將不勝感激。
經過一番挖掘，我發現最有可能出錯的地方......
我在終端中執行gcc -Wp,-v -E -以查看以什么順序搜索了哪些路徑。
這是 output：
#include <...> search starts here:
/usr/local/include
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/13.0.0/include
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks (framework directory)
如您所見，首先搜索的是/usr/local/include ，它確實包含一個版本的“math.h”。
確定這一點后，我編輯了“cmath”中的#include 行，使其直接指向同一目錄中的行，如下所述：
// this was here before
#include <math.h>
// and I changed it to this
#include </Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/math.h>
在此之后，編譯行g++ -std=c++17 client.cpp mathtest.pb.cc mathtest.grpc.pb.cc -o client 'pkg-config --libs --cflags protobuf grpc++'現在返回以下錯誤：
ld: library not found for -lre2
clang: error: linker command failed with exit code 1 (use -v to see invocation)
所以似乎我已經修復了 math.h 問題，並且發現了更多需要探索的內容。 耶。
如果您認為這是一個壞主意，請有人加入。 我知道這不是最明智的決定，因為它可能會影響未來的其他事情，但我找不到任何關於更改搜索目錄順序的內容。
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