為什麼我在 Catalina C 中收到「全域命名空間中沒有名為 'signbit' 的成員」錯誤？

Catalina C++: "No Member Named 'signbit' in Global Namespace" Error

When compiling a C++ program using headers after upgrading to Catalina from Mojave, users may encounter the error:

error: no member named 'signbit' in the global namespace

This issue arises when the compiler cannot locate the correct header, which contains the signbit function.

To resolve this problem, one must ensure that the compiler is pointed to the appropriate SDKheaders.

Solution

• Verify the compiler version.
• Set the CMAKE_OSX_SYSROOT variable to the correct SDK path using the xcrun --show-sdk-path command. This path should be used as the argument for -isysroot.
• In CMake, this can be achieved by adding the following line to the CMakeLists.txt file:

set(CMAKE_CXX_FLAGS "[...] -isysroot /sdk/path")

where /sdk/path is the SDK path obtained from xcrun.

Additionally, disabling System Integrity Protection (SIP) may also resolve the issue.

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