[Rd] Cannot override default -O3 flag on Winodws, dll does not have symbols

Prof Brian Ripley ripley at stats.ox.ac.uk
Thu Jan 10 08:55:29 CET 2013

On 10/01/2013 02:58, rtaylor wrote:
> In trying to compile a package with c code using Rtools, -O3 is added by
> default. This comes from Makeconf?  Compiler flags (CFLAGS="-O0 -g" ) set in
> src/Makevars.win or src/Makevars appear before this.
> nm pkg.dll reveals no symbols!

That is not a function of using -O3, if there is useful code (as there 
needs to be in an R package since you need to link to entry points).
> How can I compile a Windows package with "-O2 -g"?

By following the manuals.  'Writing R Extensions' points you to your 
local version of

But it you want debug symbols, read about how to build a debug version 
of R in that manual (and use -gdwarf-2).

> Thanks,
> RT
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Brian D. Ripley,                  ripley at 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 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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