>Dirk Eddelbuettel <[EMAIL PROTECTED]> writes: > > On 4 February 2008 at 01:51, Joe Bloggs wrote: > | Dirk Eddelbuettel <[EMAIL PROTECTED]> 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 > | > | to: > | > | 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.
Oops, sorry, I must have made a mistake. Tried it again this morning and realize that I do need to remove compiler optimizations. So probably -g will work just as well as -ggdb, but -O is needed instead of -O2. > | 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 > > http://tolstoy.newcastle.edu.au/R/help/03a/0566.html > > Hope this helps, Dirk > Thanks for the link, I also found this: http://cran.r-project.org/doc/FAQ/R-FAQ.html#Debugging-R-from-within-Emacs (should have checked earlier!) However, I can't seem to get both R & gdb working together in emacs. I start R in emacs, load the library to be debugged, then start gdb in emacs, attach it to the R process, set the breakpoint, type "signal 0" in gdb to let R take control, then run the R function I am debugging and... emacs hangs up on me :( I can get it to work if I run R in a seperate shell, and run gdb from emacs, attaching it to the R process as before. If I also load the source for the package I'm debugging then it also shows me whereabouts in that file I am which is very nice. > | > | > Hope this helps, Dirk > | > > | > -- > | > Three out of two people have difficulties with fractions. > | > > | > ______________________________________________ > | > R-devel@r-project.org mailing list > | > https://stat.ethz.ch/mailman/listinfo/r-devel > | > | ______________________________________________ > | R-devel@r-project.org mailing list > | https://stat.ethz.ch/mailman/listinfo/r-devel > > -- > Three out of two people have difficulties with fractions. > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
