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### 18.29 D ABI parameters

— D Target Hook: void TARGET_D_CPU_VERSIONS (void)

> Declare all environmental version identifiers relating to the target CPU using the function `builtin_version`, which takes a string representing the name of the version. Version identifiers predefined by this hook apply to all modules that are being compiled and imported.

— D Target Hook: void TARGET_D_OS_VERSIONS (void)

> Similarly to `TARGET_D_CPU_VERSIONS`, but is used for versions relating to the target operating system.

— D Target Hook: void TARGET_D_REGISTER_CPU_TARGET_INFO (void)

> Register all target information keys relating to the target CPU using the function `d_add_target_info_handlers`, which takes a ``struct d_target_info_spec`' (defined in `d/d-target.h`). The keys added by this hook are made available at compile time by the `__traits(getTargetInfo)` extension, the result is an expression describing the requested target information.

— D Target Hook: void TARGET_D_REGISTER_OS_TARGET_INFO (void)

> Same as `TARGET_D_CPU_TARGET_INFO`, but is used for keys relating to the target operating system.

— D Target Hook: const char * TARGET_D_MINFO_SECTION

> Contains the name of the section in which module info references should be placed. This section is expected to be bracketed by two symbols to indicate the start and end address of the section, so that the runtime library can collect all modules for each loaded shared library and executable. The default value of `NULL` disables the use of sections altogether.

— D Target Hook: const char * TARGET_D_MINFO_START_NAME

> If `TARGET_D_MINFO_SECTION` is defined, then this must also be defined as the name of the symbol indicating the start address of the module info section

— D Target Hook: const char * TARGET_D_MINFO_END_NAME

> If `TARGET_D_MINFO_SECTION` is defined, then this must also be defined as the name of the symbol indicating the end address of the module info section

— D Target Hook: bool TARGET_D_HAS_STDCALL_CONVENTION (unsigned int *link_system, unsigned int *link_windows)

> Returns `true` if the target supports the stdcall calling convention. The hook should also set link_system to `1` if the `stdcall` attribute should be applied to functions with `extern(System)` linkage, and link_windows to `1` to apply `stdcall` to functions with `extern(Windows)` linkage.

— D Target Hook: bool TARGET_D_TEMPLATES_ALWAYS_COMDAT

> This flag is true if instantiated functions and variables are always COMDAT if they have external linkage. If this flag is false, then instantiated decls will be emitted as weak symbols. The default is `false`.