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Need help with getenv()

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McNerdius
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Need help with getenv()

Posted: Thu Sep 11, 2008 10:22 am

Code:

#DEFINE DEV getenv("DEVICE")

#IF DEV == "PIC10F200"
#DEFINE M 0
#ELIF DEV == "PIC12F508"
#DEFINE M 1
#ENDIF

gives me.........

*** Error 27 "J:\Electronics\101\Serial\10F200\mcproc.h" Line 5(11,13): Expression must evaluate to a constant

I'm simply trying to create a central header that will encapsulate all
additional device-specific #defines and whatnot that are not included in
the default headers. It seems as if i cannot call getenv("device") more
than once per source file.

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Thu Sep 11, 2008 12:26 pm

The first line needs parentheses around it. Example:

Code:

#define DEV (getenv("DEVICE"))

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