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# Copyright (C) 2016 Daniel C. Dillon
#
# This file is part of RcppHoney.
#
# RcppHoney is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# RcppHoney is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with RcppHoney. If not, see <http://www.gnu.org/licenses/>.
# Return the appropriate option to pass the linker to cause it to strip
# debugging symbols out of a shared library. This only takes actual linkers
# (ld, gold, etc.) and not "wrappers" (gcc, clang, etc.). Returns the option
# that the linker needs or empty string if it is unknown.
.getLinkerOptions <- function(cmd) {
if (cmd != "") {
output <- system(paste0(cmd, " --version 2>&1"), intern=TRUE)
if (grepl("^GNU ld", output[1])) {
return("-S")
} else if (grepl("^GNU gold", output[1])) {
return("-S")
} else if (grepl("Solaris Link Editors", output[1])) {
return("-zstrip-class=debug")
}
}
return("")
}
# Given a linker (ld, gold, etc.) or a linker "wrapper" (gcc, clang, etc.),
# determine the option that can be passed to cause it to strip debugging
# symbols out of a shared library. Returns the option needed by this
# executable to strip the library or empty string if it is unknown.
.getLinkerOrWrapperOptions <- function(cmd) {
if (cmd != "") {
# First see if this is a linker in its own right and what option it
# will need.
linkerOption <- .getLinkerOptions(cmd)
if (linkerOption != "")
{
return(linkerOption)
}
# If it's not a linker, assume it's a "wrapper" and try to figure out
# what linker it will actually call.
output <- system(paste0(cmd, " --version"), intern=TRUE)
if (grepl("gcc|clang|g\\+\\+", output[1])) {
linkerCommand <- system(paste0(cmd, " --print-prog-name=ld"),
intern=TRUE)
linkerOption <- .getLinkerOptions(linkerCommand)
if (linkerOption != "") {
return(paste0("-Wl,", linkerOption))
}
}
}
return("")
}
# Given the name of an R configuration value that specifies what command will
# be executed to link a shared library, return the command line options that
# can be passed to it to cause it to strip debugging symbols from the resulting
# shared library. Returns empty string if it is unknown.
.getStripLinkerOption <- function(rConfigParam) {
rLinkerCommand <- system(paste0(file.path(R.home("bin"), "R"),
" CMD config ", rConfigParam), intern=TRUE)
if (rLinkerCommand != "") {
return(.getLinkerOrWrapperOptions(rLinkerCommand))
}
return("")
}
# If there is a single command line option that can be passed to all the linker
# executables that R will call, return it. Return empty string otherwise.
.getUniversalStripLinkerOption <- function() {
tryCatch({
possibleLinkerOptions <- c()
possibleLinkerOptions <- c(possibleLinkerOptions,
.getStripLinkerOption("SHLIB_LD"))
possibleLinkerOptions <- c(possibleLinkerOptions,
.getStripLinkerOption("SHLIB_CXXLD"))
# If all of the possible linkers will accept the same command, return it.
if (all.equal(rep(possibleLinkerOptions[1], length(possibleLinkerOptions)),
possibleLinkerOptions)) {
return(possibleLinkerOptions[1])
}
},
warning = function(w) {return("")},
error = function(e) {return("")})
return("")
}
inlineCxxPlugin <- Rcpp::Rcpp.plugin.maker(
libs = .getUniversalStripLinkerOption())
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