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The new 'raise' function can be used instead of 'throw' to keep the framework headers void of C++ throw statements, which would otherwise prevent the compilation of the headers with -fno-exceptions. In the presence of the C++ runtime, the 'raise' implementation reflects the supplied error value(s) as C++ exceptions of the appropriate type. In the (future) optional absence of the C++ runtime, 'raise' remains unresolved, which then gives us the assurance that the binary contains no code path leading to 'raise', all error conditions must have been covered in other ways than 'raise'. For this reason, 'Genode::raise' is not provided by the base library but the cxx library (C++ runtime). Once we allow components to opt out of the cxx library, 'raise' will automatically become unresolved for those strict components. Issue #5245
This directory contains library-description files. Each _<libname>.mk_ file contains the instructions for building the library _<libname>_. The .mk files are never used directly but they are implicitely processed by the build system. Libraries implementing one interface may have specialized implementations for different CPU architectures. Such architecture-specific _<libname>.mk_ files are located in corresponding _spec/_ subdirectories. For example, the .mk files of ARM-specific library variants reside in the _spec/arm/_ subdirectory. The build system automatically finds the appropriate _<libname>.mk_ file by evaluating the 'SPECS' build-configuration variable. Whenever the 'SPECS' variable contains 'arm', the build system considers the _spec/arm/_ directory.