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Re: How to properly make an enable debugging option in configure

From: Thomas Dickey
Subject: Re: How to properly make an enable debugging option in configure
Date: Fri, 12 Feb 2016 20:06:32 -0500
User-agent: Mutt/1.5.21 (2010-09-15)

On Sat, Feb 13, 2016 at 12:31:51AM +0000, Andy Falanga (afalanga) wrote:
> I would like to know the "proper" method for adding an "--enable-debug" 
> option to my build using autotools.  Perhaps what I should call this is 
> a "best-practice" or something similar.  So, some googling and Autotools 
> Mythbusters suggests it should be AC_ARG_ENABLE.  So, I put this into my 
> file:
> AC_ARG_ENABLE([debug],
>       AC_HELP_STRING([--enable-debug],
>                      [Additional output from binary and turns off 
> optimizations]),

CXXCPP doesn't appear to be set at this point, since it does not contribute
to the "checking" message below.

>        CXXFLAGS="${CXXFLAGS} -O0 -ggdb"],
>       [CXXCPP=${CXXCPP}
>        CXXFLAGS="${CXXFLAGS} -O2 -g"])

By the way, it's a common convention to put preprocessor options in
the CPPFLAGS variable, leaving CXXFLAGS for compiler options.
> However, when I run configure, I get this:
> checking how to run the C++ preprocessor...  -DDEBUG
> configure: error: in `/home/afalanga/devel/o2archanges':
> configure: error: C++ preprocessor " -DDEBUG" fails sanity check
> See `config.log' for more details
> So, I look in config.log but this doesn't really help.  Is there a 
> better way?  Should I instead make it add "#define DEBUG" in config.h if 
> "--enable-debug" is provided?  Did I make an incorrect assumption in the 
> actions arguments to AC_ARG_ENABLE()?  Any help is greatly appreciated.
> Andy

Thomas E. Dickey <address@hidden>

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