[Rd] Debugging packages with compiled C code on Windows

[Sue McDonald]

I have several related questions.

1.  Is it possible to use a GUI: Rstudio/Eclipse/Visual-studio to debug
compiled code on Windows? Things that work on Eclipse for Windows do not
work on Eclipse for Windows.
2.  R CMD INSTALL seems to override default attempts to provide
CFLAGS="-DDEBUG -g3 -O0"
3.  Is it necessary to compile R with debug turned on?   One of the FAQs
mentioned to compile R with make DEBUG=T.
4.  Using Rtools 4.0 and Jeroen's scripts for building R works great (many
thanks). But does not seem to have an impact on optimization, other than
including -gwarf-2.  It adds -DNDEBUG flag.  Is that sufficient for
debugging compiled code in a package?  Obviously, I just need to debug
package code, so does it matter?

I am happy to write-up a FAQ.

Thanks, SM

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