Prof Brian Ripley wrote:
Some of them use Fortran, please note, and libtool is none too good at that.
I didn't have an (obvious) problem with that. I did notice that DYLIB_* variables in Makeconf.in didn't have USE_LIBTOOL_TRUE/FALSE conditionalizations. That was a place it broke for me with Fortran code in modules. Was it a compile-time problem or a run-time problem you saw?
Also I noticed compilation invocations weren't set up in R 2.0.1 to prepend
"libtool --mode=compile". When I inserted those for C and Fortran, reactivated the linkage code for libtool that was already there, and then went through each module and made *.lo the dependency instead of *.o, and made *.la the target instead of *.so, I managed to get (.la) modules installed in the build tree under /build/R/library/{tools,grid,methods,splines,stats,tools).
Next I went to the src/unix directory and removed the object code, and rebuilt using:
make CPPFLAGS='-Ddlsym=lt_dlsym -Ddlopen=lt_dlopen -Ddlclose=lt_dlclose'
After that I went back to the src/main directory and first edited Rmain.c to add an include of ltdl.h , a call to LTDL_SET_PRELOADED_SYMBOLS() and a call to "lt_dlinit ()" before "Rf_initialize_R (ac, av)".
Then I modified the linkage of R.bin to add this at the start of the command:
-dlpreopen /build/R/library/tools/libs/tools.la -dlpreopen /build/R/library/stats/libs/stats.la -dlpreopen /build/R/library/methods/libs/methods.la -dlpreopen /build/R/library/grid/libs/grid.la -dlpreopen /build/R/library/stats/libs/splines.la
and:
-lltdl
at the end of the link (the libtool dlopen compatibility interface).
Following that I just went to the top of the build tree of R and let the build finish.
As you can see, no calls to dlsym get made:
$ R_HOME=/build/R gdb ./R.bin -q Using host libthread_db library "/lib/tls/libthread_db.so.1". (gdb) break main Breakpoint 1 at 0x8060c52: file /src/R-2.0.1/src/main/Rmain.c, line 32. (gdb) run -q Starting program: /build/R/src/main/R.bin -q
Breakpoint 1, main (ac=2, av=0xfefbce44) at /src/R-2.0.1/src/main/Rmain.c:32
32 {
(gdb) break dlsym
Breakpoint 2 at 0xf6fa3de6
(gdb) c
Continuing.
Detaching after fork from child process 6376.
>Compare this to a default build of R on Linux that would have them:
$ R -d 'gdb -q' -q
(no debugging symbols found)...Using host libthread_db library "/lib/tls/libthread_db.so.1".
(gdb) break main
Breakpoint 1 at 0x805ceb6
(gdb) run -q
Starting program: /usr/lib/R/bin/exec/R -q
(no debugging symbols found)...(no debugging symbols found)...
Breakpoint 1, 0x0805ceb6 in main ()
(gdb) break dlsym
Breakpoint 2 at 0xf6f55de6
(gdb) c
Continuing.
Breakpoint 2, 0xf6f55de6 in dlsym () from /lib/libdl.so.2 (gdb)
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