edd at debian.org
Mon Feb 4 03:22:30 CET 2008
On 4 February 2008 at 01:51, Joe Bloggs wrote:
| Dirk Eddelbuettel <edd at debian.org> writes:
| > On 3 February 2008 at 01:08, Joe Bloggs wrote:
| > | I am using gdb to debug a c++ library I made for R using Rcpp.
| > | 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.
| > | How can I compile without optimization?
| > Set MAKEFLAGS accordingly, possibly by editing R's Makeconf. This is
| > documented in the 'R Extensions' manual.
| Thanks, for the benefit of others..
| I changed the CXXFLAGS line in /etc/R/Makeconf from:
| CXXFLAGS = -g -O2
| CXXFLAGS = -ggdb -O2
Hm, I never seem to have needed -ggdb, for me -g was usually suffcient. Any
idea why you needed -ggdb ?
| which seems to work. Changing -O2 to just -O would remove compiler optimizations, but it turns out this wasn't necessary.
| Alternatively I could compile my package with
| MAKEFLAGS="CXXFLAGS=-ggdb -O2" R CMD INSTALL ...
| to temporarily change the flags.
| > | Also, is there any neat way to run R with gdb through emacs?
| > Yes, using 'M-x gdb' to launcg the gdb frontend. I also use ddd on Linux.
| > Using the debugger is also described in the 'R Extensions' manual.
| In the manual it says to run R through gdb by: R -d gdb
| how can I do this in emacs?
| Alternatively how do I run R through gdb after alreay starting gdb?
I thought that was in the manual, but it seems it isn't. Doug Bates
describes it once or twice a few years back; one quick Google search leads to
Hope this helps, Dirk
| > Hope this helps, Dirk
| > --
| > Three out of two people have difficulties with fractions.
| > ______________________________________________
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| R-devel at r-project.org mailing list
Three out of two people have difficulties with fractions.
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