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
> configure.ac file:
>
> AC_ARG_ENABLE([debug],
> AC_HELP_STRING([--enable-debug],
> [Additional output from binary and turns off
> optimizations]),
> [CXXCPP="${CXXCPP} -DDEBUG"
CXXCPP doesn't appear to be set at this point, since it does not contribute
to the "checking" message below.
> CXXFLAGS="${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 <dic...@invisible-island.net>
http://invisible-island.net
ftp://invisible-island.net
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