Cannot undefine macros in cvicc

[gdargaud]

Hello all,

in cvicc (CVI compiler for Linux), there's an option -DDEFINE to define a macro, but no equivalent -U to undefine it. It would be useful because the macros defined in [Options][Build Options][Compiler defines] are indeed used by cvicc when compiling on Linux. If I need a project-level macro defined on Windows but not on Linux, I don't know how to remove it except by parsing it out of the prj file before compilation.

[AvatarAang]

Hello,

Great input. Can you post this on NI Idea Exchange? That is where the developers look for input for software changes.

[gdargaud]

Done: https://forums.ni.com/t5/LabWindows-CVI-Idea-Exchange/Add-a-way-to-undefine-macros-in-cvicc/idi-p/36...

[Constantin--P]

Hello gdargaud,

If you want to have macros defined conditionally I suggest you to use a Precompiled Header instead of Compilers Defines in Build Options. Then in the prefix header add your defines conditionally:

#if _NI_mswin_
// windows defines
#define _MINUS_U
#else
// linux defines
#endif

You don't have to #include this header in *.c files because it is included automatically

I hope it helps.

Constantin

[gdargaud]

Thanks Constantin,

I'd never noticed that CVI supports precompiled headers. With fast computers nowadays, I've never felt the needs for them, but I'll keep it in mind in that case.