macOS* 10.14.4 release broke Intel's C++ 2019 Update 3 and older compilers. We test against beta versions of macOS. Sometimes vendors make last minute changes between the last beta and product release. That is the case here. We get the releases at the same time as the community, we do not get advanced copies of releases from vendors such as Apple or Microsoft.
We apologize for the inconvenience. we have a fix in 2019 Update 4 compilers. This will be released soon.
For now, please avoid updating to 10.14.4. 10.14.3 and older work as expected.
