Programming Tutorials

  You updated to Xcode 16, ran a clean build, and watched your previously stable React Native or Objective-C++ project implode. The error log isn't pointing to a syntax error. Instead, you are facing the opaque "unexpected service error: The Xcode build system has crashed" or the relentless   fatal error: module map file '/Path/To/Module/module.modulemap' not found . This is not a code logic issue; it is a dependency graph resolution failure caused by Xcode 16's stricter Clang compiler and LLVM build service (XCBuild). Here is the root cause analysis and the definitive configuration fixes to resolve build system crashes and module map failures in mixed C++/Objective-C environments. The Root Cause: Clang PCMs and Header Visibility To understand why the build system crashes, you must understand  Precompiled Modules (PCMs) . When Xcode builds a Framework or a Library, it attempts to generate a Module Map. This map tells Clang how to treat the headers in that libr...