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# defualt compiler unset
define(COMPILER = "")
# check whether user has Makevars file that might cause trouble
makevars <- Sys.getenv("R_MAKEVARS_USER", unset = "~/.R/Makevars")
if (file.exists(makevars)) {
contents <- readLines(makevars, warn = FALSE)
pattern <- "^(PKG_CPPFLAGS|PKG_CXXFLAGS)\\s*="
bad <- grep(pattern, contents, perl = TRUE, value = TRUE)
if (length(bad)) {
text <- c(
"",
sprintf("NOTE: '%s' contains variable declarations incompatible with RcppParallel:", makevars),
"",
paste0("\t", bad),
"",
"Makevars variables prefixed with 'PKG_' should be considered reserved for use by R packages.",
""
)
writeLines(text, con = stdout())
}
}
# Figure out the appropriate CXX prefix for the current
# version of R + configuration.
cxx <- "/usr/bin/c++"
candidates <- c("CXX11", "CXX1X", "CXX")
for (candidate in candidates) {
value <- r_cmd_config(candidate)
if (!is.null(value)) {
if (any(grepl("icpc", value))) {
define(COMPILER = "icc")
}
cxx <- candidate
break
}
}
# work around issue with '-Werror=format-security' being specified without
# a prior '-Wformat', which makes gcc angry
cxxflags <- read_r_config(sprintf("%sFLAGS", cxx), envir = NULL)[[1]]
broken <-
grepl(" -Werror=format-security ", cxxflags) &&
!grepl(" -Wformat ", cxxflags)
if (broken)
cxxflags <- gsub("-Werror=format-security", "-Wformat -Werror=format-security", cxxflags)
# avoid including /usr/local/include, as this can cause
# RcppParallel to find and use a version of libtbb installed
# there as opposed to the bundled version
cppflags <- read_r_config("CPPFLAGS", envir = NULL)[[1]]
cppflags <- sub("(?: )?-I/usr/local/include", "", cppflags)
cppflags <- sub("(?: )?-I/opt/homebrew/include", "", cppflags)
# define the set of flags appropriate to the current
# configuration of R
switch(
cxx,
CXX11 = define(
CC = "$(CC)",
CPPFLAGS = cppflags,
CXX11 = "$(CXX11)",
CXX11FLAGS = cxxflags,
CXX11STD = "$(CXX11STD)",
CXX11PICFLAGS = "$(CXX11PICFLAGS)"
),
CXX1X = define(
CC = "$(CC)",
CPPFLAGS = cppflags,
CXX11 = "$(CXX1X)",
CXX11FLAGS = cxxflags,
CXX11STD = "$(CXX1XSTD)",
CXX11PICFLAGS = "$(CXX1XPICFLAGS)"
),
CXX = define(
CC = "$(CC)",
CPPFLAGS = cppflags,
CXX11 = "$(CXX)",
CXX11FLAGS = cxxflags,
CXX11STD = "-std=c++0x",
CXX11PICFLAGS = "-fPIC"
),
stop("Failed to infer C / C++ compilation flags")
)
# define special flags for Windows
db <- configure_database()
info <- as.list(Sys.info())
if (info[["sysname"]] == "Windows") {
# for older versions of R, we need to resolve the
# 'true' path to the C / C++ compiler; we do so
# via the cygpath utility here
fmt <- if (getRversion() < "4.2.0") {
cygpath <- nzchar(Sys.which("cygpath"))
if (cygpath) "$(shell cygpath -m \"%s\")" else "%s"
} else {
"%s"
}
define(
WINDOWS_CC = sprintf(fmt, db$CC),
WINDOWS_CXX11 = sprintf(fmt, db$CXX11)
)
}
# use c++0x for compatibility with older compilers
if (getRversion() < "4.0") {
define(STDVER = "stdver=c++0x")
} else {
define(STDVER = "")
}
# on Solaris, check if we're using gcc or g++
if (Sys.info()[["sysname"]] == "SunOS") {
cxx <- r_cmd_config("CXX")
version <- system(paste(cxx, "--version"), intern = TRUE)
for (compiler in c("gcc", "g++")) {
if (any(grepl(compiler, version, fixed = TRUE))) {
define(COMPILER = "gcc")
}
}
}
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