Why Am I Getting 'No Member Named signbit' Errors After Upgrading to Catalina?

Error: Using Headers Yields No Member Named signbit In Global Namespace

After upgrading to Catalina, using headers from the library results in an error indicating that there are no members named signbit, fpclassify, and isfinite in the global namespace.

Cause:

The error is likely caused by an incorrect CMAKE_OSX_SYSROOT setting. On Catalina, the /usr/include directory, where C headers are traditionally located, has been purged and protected by SIP. This means that projects that expect to find C headers in /usr/include will fail to compile.

Solution:

To resolve the issue, you must point the build system to the correct header locations. Here are the steps to follow:

1. Verify that Xcode is up to date.
2. Use the -isysroot /sdk/path, where /sdkpath is the output of xcrun --show-sdk-path, as a compiler flag.

3. In CMake:

   (a) Set CMAKE_OSX_SYSROOT to /sdk/path.

   OR

   (b) Set CMAKE_CXX_FLAGS with the -isysroot /sdk/path flag.

Additional Options:

If the above solutions do not work, you can try disabling SIP, although this is not recommended. You can find instructions on how to do so by referring to the provided link in the answer text.

The above is the detailed content of Why Am I Getting 'No Member Named signbit' Errors After Upgrading to Catalina?. For more information, please follow other related articles on the PHP Chinese website!