[Rd] Overriding optimisation flags

[Ernest Turro]

Dear all,

If one specifies, say, "PKG_CXXFLAGS= -O3" in a Makevars file, it  
will not make a difference to how the code is compiled if -O2 is  
specified in $R_HOME/etc/Makeconf. This is because PKG_CXXFLAGS is  
prepended to the corresponding flags in $R_HOME/etc/Makeconf instead  
of being appended and gcc only uses the last optimisation flag  
specified. As a result, one has to use targets in Makevars, which  
adds unnecessary complication to the whole process. Would it be  
possible to ensure PKG_CXXFLAGS & co.  are appended instead of  
prepended to the default flags and, if not, is there an easier  
workaround than specifying targets? (targets are easy enough under  
unix, but seems a bit more complicated under windows...)

Thanks!

E