> The use case for precompiled headers is relatively simple: when there is a common set of headers that is included in nearly every source file in the project,

> The use case for precompiled headers is relatively simple: when there is a common set of headers that is included in nearly every source file in the project, we precompile that bundle of headers into a __single__ precompiled header (PCH file). From https://clang.llvm.org/docs/PCHInternals.html#design-philosophy https://clang.llvm.org/docs/PCHInternals.html#design-philoso... (emphasis mine)