[Rd] Overriding optimisation flags

From: Ernest Turro <ernest.turro_at_ic.ac.uk>
Date: Thu, 13 Sep 2007 16:09:37 +0100

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...)



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