[Rd] shared libraries on AIX (PR#1316)

[lio@hpss1.ccs.ornl.gov]

Full_Name: Daniel L. Million
Version: 1.4.1
OS: AIX 4.3.3/5.1
Submission from: (NULL) (160.91.192.125)


R almost works if I build on AIX without the R shared library (except for
crashing
on exit and a few other anomalies).  I can't get it to do much at all if I
build
with --enable-R-shlib.

For example, it won't load the X11 driver.  I ran R in a debugger and traced it
down to the point where R_load_X11_shlib successfully loads the R_X11.so
library
and calls R_init_X11.  This calls R_setX11Routines in src/unix/X11.c.  On entry

to this function, ptr_X11DeviceDriver = 0x2002eb20 and dev = 0x2014ba08.  After
the statement

    ptr_X11DeviceDriver = dev;

is executed, ptr_X11DeviceDriver remains unchanged at 0x2002eb20 !!  So when I
type "X11()" at the R prompt, all I ever get is the stub message, "the x11
device
has not been loaded".

I don't know enough about how shared libraries interact to understand why this
pointer is apparently write-protected.  I'm hoping someone here can give me a
clue.

Dan


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