nim-wiki/Consts-defined-by-the-compi...

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# Defined
2015-07-16 04:22:33 +00:00
The following three lists are compiled from:
[Nim/compiler/plataform.nim](https://github.com/nim-lang/Nim/blob/devel/compiler/platform.nim) and
[Nim/compiler/extccomp.nim](https://github.com/nim-lang/Nim/blob/1ad729ee3b4738cffcbf0009e8849cb57b729e91/compiler/extccomp.nim)
One can use some name from them like:
```nim
when defined(Windows):
doSomething()
```
### Operating Systems:
* ``DOS``
* ``Windows``
* ``OS2``
* ``Linux``
* ``MorphOS``
* ``SkyOS``
* ``Solaris``
* ``Irix``
* ``NetBSD``
* ``FreeBSD``
* ``OpenBSD``
* ``AIX``
* ``PalmOS``
* ``QNX``
* ``Amiga``
* ``Atari``
* ``Netware``
* ``MacOS``
* ``MacOSX``
* ``Haiku``
* ``VxWorks``
* ``JS``
* ``NimrodVM``
* ``Standalone``
### CPU Architectures:
* ``i386``
* ``m68k``
* ``alpha``
* ``powerpc``
* ``powerpc64``
* ``sparc``
* ``vm``
* ``ia64``
* ``amd64``
* ``mips``
* ``arm``
* ``js``
* ``nimrodvm``
* ``avr``
### Compilers:
* ``vcc`` Microsoft's Visual C++
* ``gcc`` Gnu C
* ``llvm_gcc`` LLVM-GCC compiler
* ``icc`` Intel C++ compiler
* ``clang`` Clang compiler
* ``bcc`` Borland C Compiler
* ``dmc`` Digital Mars C Compiler
* ``wcc`` Watcom C Compiler
* ``tcc`` Tiny C Compiler
* ``pcc`` Pelles C Compiler
* ``ucc`` Generic UNIX C compiler
# compileOption
Also remember about how to access the [compiler options](http://nim-lang.org/docs/nimc.html):
```nim
when compileOption("boundChecks"): # d:release should disable this.
if i > q.high: # x < q.low is taken care by the Natural parameter
raise newException(IndexError, "Bla has less than " & $(i+1) & " elements.")
discard
```
TODO: List them here and how to correctly access the more complex ones.