Lines Matching full:directives
35 * **Fragility**: ``#include`` directives are treated as textual
46 ``#include`` directives or introduce ``#undef`` directives to break
127 The primary user-level feature of modules is the import operation, which provides access to the API of software libraries. However, today's programs make extensive use of ``#include``, and it is unrealistic to assume that all of this code will change overnight. Instead, modules automatically translate ``#include`` directives into the corresponding module import. For example, the include directive
144 different strategy is used for ``#include_next`` directives in such files: the
154 The crucial link between modules and headers is described by a *module map*, which describes how a collection of existing headers maps on to the (logical) structure of a module. For example, one could imagine a module ``std`` covering the C standard library. Each of the C standard library headers (``<stdio.h>``, ``<stdlib.h>``, ``<math.h>``, etc.) would contribute to the ``std`` module, by placing their respective APIs into the corresponding submodule (``std.io``, ``std.lib``, ``std.math``, etc.). Having a list of the headers that are part of the ``std`` module allows the compiler to build the ``std`` module as a standalone entity, and having the mapping from header names to (sub)modules allows the automatic translation of ``#include`` directives to module imports.
242 * A set of macro directives is *consistent* if it consists of only ``#undef`` directives, or if all ``#define`` directives in the set define the macro name to the same sequence of tokens (following the usual rules for macro redefinitions).
243 * If a macro name is used and the set of active directives is not consistent, the program is ill-formed. Otherwise, the (unique) meaning of the macro name is used.
618 ``#include`` directives are automatically mapped to module imports,
853 Headers are often missing ``#include`` directives for headers that they actually depend on. As with the problem of conflicting definitions, this only affects unlucky users who don't happen to include headers in the right order. With modules, the headers of a particular module will be parsed in isolation, so the module may fail to build if there are missing includes.
865 Unlike with ``#include`` directives, it should be fairly simple to track whether a directly-imported module has ever been used. By doing so, Clang can emit ``unused import`` or ``unused #include`` diagnostics, including Fix-Its to remove the useless imports/includes.
898 .. [#] The preprocessing context in which the modules are parsed is actually dependent on the command-line options provided to the compiler, including the language dialect and any ``-D`` options. However, the compiled modules for different command-line options are kept distinct, and any preprocessor directives
