From mboxrd@z Thu Jan  1 00:00:00 1970
From: rlau@csc.com
To: gcc@gcc.gnu.org
Subject: Use command line defines vs defining in header files.
Date: Mon, 28 Aug 2000 13:11:00 -0000
Message-id: <OF52EA69A9.972B648C-ON86256949.006E72AC@com>
X-SW-Source: 2000-08/msg00614.html

Can anyone give me a strong argument as whether defining constants for
conditional compiling as compiler argument vs.
   defining thems in header files?

for examples:



test.h
#ifdef COMPILER_OPT1
:
#else
:
#endif

#ifdef COMPILER_OPT2
:
#else
:
#endif
-------------------------------------------

So, if I would be defining COMPILER_OPT1 as compiler argument, I would do
something like gcc -d COMPILER_OPT1 test.cpp.

If I would defining COMPILER_OPT1 in header files, I would define it in
test.h before #ifdef COMPILER_OPT1.