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# Copyright (C) 2016 Daniel C. Dillon
#
# This file is part of r-stripper.
#
# r-stripper 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.
#
# r-stripper 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 r-stripper. 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(fail) {
tryCatch({
if (!fail) {
possibleLinkerOptions <- c()
possibleLinkerOptions <- c(possibleLinkerOptions,
.getStripLinkerOption("SHLIB_LD"))
possibleLinkerOptions <- c(possibleLinkerOptions,
.getStripLinkerOption("SHLIB_CXXLD"))
} else {
possibleLinkerOptions <- .getStripLinkerOption("F77")
}
# 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("")
}
# Write the appropriate argument to a Makevars file
.writeMakevars <- function(fileName, argument, createIfMissing) {
if (file.exists(fileName)) {
lines <- readLines(fileName)
file.rename(fileName, paste0(fileName, ".r-stripper.bak"))
} else if (createIfMissing) {
lines <- c()
} else {
return(FALSE)
}
outfile <- file(fileName, open="w")
i <- 1
foundPkgLibs <- FALSE
while (i <= length(lines)) {
line <- lines[i]
if (grepl(".*PKG_LIBS.*=", line)) {
foundPkgLibs <- TRUE
found <- FALSE
while (i + 1 <= length(lines)
&& substr(line, nchar(line), nchar(line)) == "\\") {
if (grepl("R_STRIPPER_ARGUMENT", line)) {
found <- TRUE
}
writeLines(line, outfile)
i <- i + 1
line <- lines[i]
}
# Something is not formatted correctly in Makevars
if (i + 1 > length(lines)
&& substr(line, nchar(line), nchar(line)) == "\\") {
close(outfile)
file.rename(paste0(fileName, ".r-stripper.bak"), fileName)
return(FALSE)
}
if (!found && !grepl("R_STRIPPER_ARGUMENT", line)) {
line <- paste0(line, " $(R_STRIPPER_ARGUMENT)")
}
writeLines(line, outfile)
} else if (grepl("R_STRIPPER_ARGUMENT", line)) {
# do nothing, we'll purge this line and write it back later
} else {
# not a line we're interested in, just write it back
writeLines(line, outfile)
}
i <- i + 1
}
if (!foundPkgLibs) {
writeLines("PKG_LIBS = $(R_STRIPPER_ARGUMENT)", outfile)
}
writeLines(paste0("R_STRIPPER_ARGUMENT = ", argument), outfile)
close(outfile)
return(TRUE)
}
args <- commandArgs(trailingOnly = TRUE)
fail <- FALSE
if (length(args) > 0 && args[1] == "fail") {
fail <- TRUE
}
argument <- .getUniversalStripLinkerOption(fail)
if (argument != "") {
.writeMakevars("src/Makevars", argument, TRUE)
.writeMakevars("src/Makevars.win", argument, FALSE)
}
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