Only export relevant symbols to shared library.

[troels]

Hi,

I have problems using RPostgres and RSQLite from the same R-process.

I get stacktraces such as these:

 *** caught segfault ***
address 0x1000000010, cause 'memory not mapped'

Traceback:
 1: result_release(res@ptr)
 2: dbClearResult(rs)
 3: dbClearResult(rs)
 4: dbExecute(con, "SET TIMEZONE='UTC'")
 5: dbExecute(con, "SET TIMEZONE='UTC'")
 6: .local(drv, ...)
 7: DBI::dbConnect(RPostgres::Postgres(), dbname = "kingfisher")
 8: DBI::dbConnect(RPostgres::Postgres(), dbname = "kingfisher")
 9: eval(expr)
10: eval(expr)
11: create_connection(production = production)
12: load_list_of_tables("ensembl", tables, production = production)
An irrecoverable exception occurred. R is aborting now ...
bin/load_ensembl.sh: line 7: 36907 Segmentation fault      (core dumped) Rscript R/load_ensembl.R

After wading through the code with gdb it appears that RSQLite's result_release collides with RPostgres' result_release in their respective shared libraries. The best way to fix that is probably to only export symbols from the shared library which will be needed by R.

So I suggest changing default symbol visibility to hidden, so the two libraries can coexist peacefully.

See here for more information:
RcppCore/Rcpp#720

[krlmlr]

Thanks!