On 11/04/2013 13:01, Duncan Murdoch wrote:
On 13-04-10 8:02 PM, Andre Mikulec wrote:
Hi,
I am trying to make a debug version of R ( for use with gdb later ) on
windows.
I am executing the following.
src\gnuwin32>make clean
src\gnuwin32>make DEBUG=T
In the output, I see many
-O3 flags
I do not see any
-g -O0 flags
which ( I believe/I think ) that is what I need to debug R in gdb.
What is the proper way to 'make' a 'Debug version of R'?
You don't need -O0 to debug in gdb, you just need the -g flag set
properly, which DEBUG=T will do for you. That's how I generally do it.
As Duncan says 'set properly'. Things have changed and are changing
currently in the gcc/gdb world, so I prefer to be explicit and use
-gdwarf-2 (which is what DEBUG=T inserts currently). (At one point that
was essential, and might be again soon as dwarf-4 is the default in gcc
4.8.x -- possibly not on Windows, which has other quite fundamental
changes to exception handling under 4.8.x.)
Setting -O0 might make debugging easier (because it eliminates
optimizations). To do that, you'll need to change the CFLAGS setting in
src/gnuwin32/Makefiles. (You may also be able to do it with a CFLAGS
environment variable, I haven't tried.) I don't usually do this, since
it changes the code: if you need gdb, chances are the bug is subtle,
and its behaviour may change with optimization level. But you may have
a different preference.
Duncan Murdoch
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Brian D. Ripley, rip...@stats.ox.ac.uk
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