## make sure system.file returns an absolute path
Rcpp.system.file <- function(...){
    tools:::file_path_as_absolute( base:::system.file( ..., package = "Rcpp" ) )
}

## identifies if the default linking on the platform should be static
## or dynamic. Currently only linux uses dynamic linking by default
## although it works fine on mac osx as well
staticLinking <- function() {
    ! grepl( "^linux", R.version$os )
}

## Use R's internal knowledge of path settings to find the lib/ directory
## plus optinally an arch-specific directory on system building multi-arch
RcppLdPath <- function() {
    if (nzchar(.Platform$r_arch)) {	## eg amd64, ia64, mips
        path <- Rcpp.system.file("lib",.Platform$r_arch)
    } else {
        path <- Rcpp.system.file("lib")
    }
    path
}

## Provide linker flags -- i.e. -L/path/to/libRcpp -- as well as an
## optional rpath call needed to tell the Linux dynamic linker about the
## location.  This is not needed on OS X where we encode this as library
## built time (see src/Makevars) or Windows where we use a static library
## Updated Jan 2010:  We now default to static linking but allow the use
##                    of rpath on Linux if static==FALSE has been chosen
##                    Note that this is probably being called from LdFlags()
RcppLdFlags <- function(static=staticLinking()) {
    rcppdir <- RcppLdPath()
    if (static) {                               # static is default on Windows and OS X
        flags <- paste(rcppdir, "/libRcpp.a", sep="")
        #if (.Platform$OS.type=="windows") {
        #    flags <- shQuote(flags)
        #}
    } else {					# else for dynamic linking
        flags <- paste("-L", rcppdir, " -lRcpp", sep="") # baseline setting
        if ((.Platform$OS.type == "unix") &&    # on Linux, we can use rpath to encode path
            (length(grep("^linux",R.version$os)))) {
            flags <- paste(flags, " -Wl,-rpath,", rcppdir, sep="")
        }
    }
    invisible(flags)
}

# indicates if Rcpp was compiled with GCC >= 4.3
canUseCXX0X <- function() .Call( "canUseCXX0X", PACKAGE = "Rcpp" )

## Provide compiler flags -- i.e. -I/path/to/Rcpp.h
RcppCxxFlags <- function(cxx0x=FALSE) {
    # path <- RcppLdPath()
    path <- Rcpp.system.file( "include" )
    #if (.Platform$OS.type=="windows") {
    #    path <- shQuote(path)
    #}
    paste("-I", path, if( cxx0x && canUseCXX0X() ) " -std=c++0x" else "", sep="")
}

## Shorter names, and call cat() directly
## CxxFlags defaults to no using c++0x extensions are these are considered non-portable
CxxFlags <- function(cxx0x=FALSE) {
    cat(RcppCxxFlags(cxx0x=cxx0x))
}
## LdFlags defaults to static linking on the non-Linux platforms Windows and OS X
LdFlags <- function(static=staticLinking()) {
    cat(RcppLdFlags(static=static))
}

# capabilities
RcppCapabilities <- capabilities <- function() .Call("capabilities", PACKAGE = "Rcpp")

# compile, load and call the cxx0x.c script to identify whether
# the compiler is GCC >= 4.3
RcppCxx0xFlags <- function(){
    script <- Rcpp.system.file( "discovery", "cxx0x.R" )
    flag <- capture.output( source( script ) )
    flag
}

Cxx0xFlags <- function() cat( RcppCxx0xFlags() )



## new proposed implementation below, all prefixed with two comments (thanks, Emacs)
## I put it here as R CMD check doesn't like the previous way of parking it here with
## a non-standard name

## ## Use R's internal knowledge of path settings to find the lib/ directory
## ## plus optinally an arch-specific directory on system building multi-arch
## RcppLdPath <- function() {
## 	packageLibPath( package = "Rcpp" )
## }

## ## Provide linker flags -- i.e. -L/path/to/libRcpp -- as well as an
## ## optional rpath call needed to tell the Linux dynamic linker about the
## ## location.  This is not needed on OS X where we encode this as library
## ## built time (see src/Makevars) or Windows where we use a static library
## ## Updated Jan 2010:  We now default to static linking but allow the use
## ##                    of rpath on Linux if static==FALSE has been chosen
## ##                    Note that this is probably being called from LdFlags()
## RcppLdFlags <- function(static=staticLinking()) {
##     packageLdFlags( "Rcpp", static )
## }

## # indicates if Rcpp was compiled with GCC >= 4.3
## canUseCXX0X <- function() .Call( "canUseCXX0X", PACKAGE = "Rcpp" )

## ## Provide compiler flags -- i.e. -I/path/to/Rcpp.h
## RcppCxxFlags <- function(cxx0x=FALSE) {
##     iflag <- includeFlag( package = "Rcpp" )
##     paste( iflag, if( cxx0x && canUseCXX0X() ) " -std=c++0x" else "" )
## }

## ## Shorter names, and call cat() directly
## ## CxxFlags defaults to no using c++0x extensions are these are considered non-portable
## CxxFlags <- function(cxx0x=FALSE) {
##     cat(RcppCxxFlags(cxx0x=cxx0x))
## }
## ## LdFlags defaults to static linking on the non-Linux platforms Windows and OS X
## LdFlags <- function(static=staticLinking()) {
##     cat(RcppLdFlags(static=static))
## }

## # capabilities
## RcppCapabilities <- capabilities <- function() .Call("capabilities", PACKAGE = "Rcpp")

## # compile, load and call the cxx0x.c script to identify whether
## # the compiler is GCC >= 4.3
## RcppCxx0xFlags <- function(){
## 	script <- system.file( "discovery", "cxx0x.R", package = "Rcpp" )
## 	flag <- capture.output( source( script ) )
## 	flag
## }

## Cxx0xFlags <- function() cat( RcppCxx0xFlags() )




## # indicates the default linking on the current platform
## #
## # default is to use static linking on windows an OSX
## staticLinking <- function(){
## 	.Platform$OS.type == "windows" || grepl( "^darwin", R.version$os )
## }

## # the /lib path of the specified package (maybe including the arch)
## packageLibPath <- function( package = "Rcpp" ){
## 	if (nzchar(.Platform$r_arch)) {	## eg amd64, ia64, mips
##         system.file("lib",.Platform$r_arch,package=package)
##     } else {
##         system.file("lib",package=package)
##     }
## }

## # on windows wrap the file with shQuote,
## # otherwise, do nothing
## wrapFile <- function( file ){
## 	if (.Platform$OS.type=="windows") {
##         file <- shQuote(file)
##     }
##     file
## }

## # generic include flag
## includeFlag <- function( package = "Rcpp" ){
## 	paste( "-I", wrapFile(packageLibPath(package)), sep = "" )
## }

## # path to the static library file
## staticLib <- function(package = "Rcpp" ){
## 	libfoo.a <- file.path( packageLibPath(package = package), sprintf( "lib%s.a", package ) )
## 	wrapFile( libfoo.a )
## }

## # dynamic library flags for the given package
## dynamicLib <- function( package = "Rcpp" ){
## 	libPath <- packageLibPath( package )

## 	# general default
## 	flags <- sprintf( "-L%s -l%s",
## 		libPath,
## 		package
## 	)

## 	# linux -rpath bonus
## 	if (.Platform$OS.type == "unix") {
##         if (length(grep("^linux",R.version$os))) {
##             flags <- sprintf( "%s -Wl,-rpath,%s", flags, libPath)
##         }
##     }

##     flags
## }


## packageLdFlags <- function( package = "Rcpp", static = staticLinking() ){
## 	if( static ){
## 		staticLib( package = package )
## 	} else {
## 		dynamicLib( package = package )
## 	}
## }