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

[rtaylor]

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!

How can I compile a Windows package with "-O2 -g"?

Thanks,
RT



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