passing arguments to R CMD SHLIB

Dear People,

I want to run gcc with optimisation turned on (-O2), and with -Wall (all
warnings) enabled, when using R CMD SHLIB. When I do make, which is

R CMD SHLIB -Wall -O2 cftp.c mcmc.c latticefn.c -lm

in this case, I get

faheem ~/research/cftp>make
R CMD SHLIB -Wall -O2 cftp.c mcmc.c latticefn.c -lm
make[1]: Entering directory `/home/faheem/research/cftp'
gcc -I/usr/lib/R/include  -I/usr/local/include -mieee-fp
-D__NO_MATH_INLINES  -fPIC  -g -c cftp.c -o cftp.o
gcc -shared  -o cftp.so cftp.o mcmc.o latticefn.o -L/usr/local/lib
make[1]: Leaving directory `/home/faheem/research/cftp'
faheem ~/research/cftp>

it doesn't look like the arguments -O2 and -Wall get passed down. Is there
some reason for this? I certainly would like error checking to be turned
on as much as possible.

While we are on the topic, it looked like make is involved in invoking a
command like R CMD SHLIB -Wall -O2 cftp.c mcmc.c latticefn.c -lm. This is
presumably done using clever pattern rules and/or substitutions. I am
curious about how this is done. Can someone point to me to the appropriate
portion of the source code?

On Tue, 13 Mar 2001, Faheem Mitha wrote:

it doesn't look like the arguments -O2 and -Wall get passed down. Is there
some reason for this? I certainly would like error checking to be turned
on as much as possible.

Well, no one said they would be!  If you want to alter flags, they are
set as CFLAGS R_HOME/etc/Makeconf or Makevars. I have -O2 -Wall -pedantic.
I don't think you need -lm as R is linked against that.

On Tue, 13 Mar 2001, Prof Brian D Ripley wrote:

On Tue, 13 Mar 2001, Faheem Mitha wrote:

it doesn't look like the arguments -O2 and -Wall get passed down. Is there
some reason for this? I certainly would like error checking to be turned
on as much as possible.

Well, no one said they would be!  If you want to alter flags, they are
set as CFLAGS R_HOME/etc/Makeconf or Makevars. I have -O2 -Wall -pedantic.
I don't think you need -lm as R is linked against that.

Is it possible to set CFLAGS at the user level? I am usually not terribly
keen to alter system config files (Makeconf in this case). For one thing,
I don't always have root access on the systems I use, and for another I
tend to lose my changes when I upgrade.

Prof Brian D Ripley writes:

On Tue, 13 Mar 2001, Faheem Mitha wrote:

On Tue, 13 Mar 2001, Prof Brian D Ripley wrote:

On Tue, 13 Mar 2001, Faheem Mitha wrote:

it doesn't look like the arguments -O2 and -Wall get passed down. Is there
some reason for this? I certainly would like error checking to be turned
on as much as possible.

Well, no one said they would be!  If you want to alter flags, they are
set as CFLAGS R_HOME/etc/Makeconf or Makevars. I have -O2 -Wall -pedantic.
I don't think you need -lm as R is linked against that.

Is it possible to set CFLAGS at the user level? I am usually not terribly
keen to alter system config files (Makeconf in this case). For one thing,
I don't always have root access on the systems I use, and for another I
tend to lose my changes when I upgrade.

I did say so: use a file Makevars. You can only add that way. If you do

cat > Makevars
PKG_CPPFLAGS=-O2 -Wall
^D

then that will be added to CFLAGS.

If you lose changes, make them in the file config.site, and copy that
in when you build a new version of R.  Works for me!