>>>>> "DE" == Dirk Eddelbuettel <[EMAIL PROTECTED]>
>>>>> on Sun, 3 Feb 2008 20:22:30 -0600 writes:
DE> On 4 February 2008 at 01:51, Joe Bloggs wrote:
DE> | Dirk Eddelbuettel <[EMAIL PROTECTED]> writes:
DE> |
DE> | > On 3 February 2008 at 01:08, Joe Bloggs wrote:
DE> | > | I am using gdb to debug a c++ library I made for R using Rcpp.
DE> | > | However, when I step through the code it seems to go all over the
place, and some of the variables have been optimized out so I can't see their
values.
DE> | > | How can I compile without optimization?
DE> | >
DE> | > Set MAKEFLAGS accordingly, possibly by editing R's Makeconf. This
is
DE> | > documented in the 'R Extensions' manual.
DE> | >
DE> |
DE> | Thanks, for the benefit of others..
DE> |
DE> | I changed the CXXFLAGS line in /etc/R/Makeconf from:
DE> |
DE> | CXXFLAGS = -g -O2
DE> |
DE> | to:
DE> |
DE> | CXXFLAGS = -ggdb -O2
DE> Hm, I never seem to have needed -ggdb, for me -g was usually suffcient.
Any
DE> idea why you needed -ggdb ?
DE> | which seems to work. Changing -O2 to just -O would remove compiler
optimizations, but it turns out this wasn't necessary.
DE> | Alternatively I could compile my package with
DE> |
DE> | MAKEFLAGS="CXXFLAGS=-ggdb -O2" R CMD INSTALL ...
DE> |
DE> | to temporarily change the flags.
DE> |
DE> |
DE> | > | Also, is there any neat way to run R with gdb through emacs?
DE> | >
DE> | > Yes, using 'M-x gdb' to launcg the gdb frontend. I also use ddd on
Linux.
DE> | >
DE> | > Using the debugger is also described in the 'R Extensions' manual.
DE> | >
DE> |
DE> | In the manual it says to run R through gdb by: R -d gdb
DE> | how can I do this in emacs?
C-u M-x R [Enter] -d gdb [Enter]
===
C-u: == Emacs "Prefix"
allows you to specify command line arguments to R
DE> | Alternatively how do I run R through gdb after alreay starting gdb?
DE> I thought that was in the manual, but it seems it isn't. Doug Bates
DE> describes it once or twice a few years back; one quick Google search
leads to
DE> http://tolstoy.newcastle.edu.au/R/help/03a/0566.html
DE> Hope this helps, Dirk
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