configure/build issue with gcc 3.2.0 (PR#2176)

[Roger Peng]

I noticed this on the GCC website, regarding the not-yet-released gcc
3.2.1:

* The method of constructing the list of directories to be searched for
header files has been revised. If a directory named by a -I option is a
standard system include directory, the option is ignored to ensure that
the default search order for system directories and the special treatment
of system header files are not defeated.

-roger
_______________________________
UCLA Department of Statistics
rpeng@stat.ucla.edu
http://www.stat.ucla.edu/~rpeng

On Wed, 16 Oct 2002, ripley@stats.ox.ac.uk wrote:

> This has been discussed on R-devel, and it is definitely not an R bug
> as there are workarounds stated in the R-admin manual.
> 
> Setting CPPFLAGS= (nothing) does avoid this except in the gnome module. It
> was intended to put that explicitly in the R-admin manual for 1.6.0, but
> it was not done in time (it is now there for R-patched).
> 
> We are told that this is fixed in the alphas of gcc 3.3.  Once it is clear
> exactly which versions of gcc are affected we may add a workaround in the
> configure script.
> 
> On Wed, 16 Oct 2002 rjvbertin@hotmail.com wrote:
> 
> > There is an incompatibility between R's configure/build process, and gcc 3.2.0 (and maybe earlier).
> > Gcc 3.2.0 includes -I/usr/local/include by default, on my system (default configuration), and cpp0
> > issues a warning when this flag is issued additionally by the user (= R's configure). This warning
> > ends up in the dependency sections of the Makefile that are generated "automagically". The 1st
> > occurrence is line 105 of src/appl/Makefile .
> >
> > The only way around it that I found, other than removing all -I/usr/local/include in all Makefiles is to manually add
> > -Wp,-w, a gcc/cpp argument that suppresses all cpp warnings. It also has the effect of not aborting
> > a compilation as soon as a specified header file is *not* found :(
> > If you decide to leave -I/usr/local/include and add -Wp,-w for gcc 3 compilers, I would suggest
> > *not* adding -Wp,-w if -fsyntax-only is also given, to not interfere with requested syntax-checking.
> > (that would probably require to call the compiler from a wrapper script, something I already do.)
> >
> > Rene Bertin
> >
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> 
> -- 
> Brian D. Ripley,                  ripley@stats.ox.ac.uk
> Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
> University of Oxford,             Tel:  +44 1865 272861 (self)
> 1 South Parks Road,                     +44 1865 272860 (secr)
> Oxford OX1 3TG, UK                Fax:  +44 1865 272595
> 
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