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2.7.2 Common Predefined Versions ¶

The common predefined macros are GNU D extensions. They are available with the same meanings regardless of the machine or operating system on which you are using GNU D. Their names all start with GNU.

GNU

This version is defined by the GNU D compiler. If all you need to know is whether or not your D program is being compiled by GDC, or a non-GDC compiler, you can simply test version(GNU).

GNU_DWARF2_Exceptions

GNU_SEH_Exceptions

GNU_SjLj_Exceptions

These versions reflect the mechanism that will be used for exception handling by the target. GNU_DWARF2_Exceptions is defined when the target uses DWARF 2 exceptions. GNU_SEH_Exceptions is defined when the target uses SEH exceptions. GNU_SjLj_Exceptions is defined when the target uses the setjmp/longjmp-based exception handling scheme.

GNU_EMUTLS

This version is defined if the target does not support thread-local storage, and an emulation layer is used instead.

GNU_InlineAsm

This version is defined when asm statements use GNU D style syntax. (see Inline Assembly)

GNU_StackGrowsDown

This version is defined if pushing a word onto the stack moves the stack pointer to a smaller address, and is undefined otherwise.