embed.c

#include "R/REmbedded.h"

int main(int argc, char *argv[]) {
  Rf_initEmbeddedR(argc, argv);
  R_ReplDLLinit();

  return R_ReplDLLdo1();
}

Makefile

TARGET := embed
CC := clang
SHELL := /bin/bash
FRAMEWORK_PATH ?= /Library/Frameworks

$(TARGET): $(TARGET).c
	@$(CC) -o $(TARGET) $(TARGET).c -lR \
	  -L$(FRAMEWORK_PATH)/R.framework/Libraries \
	  -I$(FRAMEWORK_PATH)/R.framework/Headers

clean:
	@$(RM) $(TARGET)

all: $(TARGET)

.PHONY: test
TESTS := "1" "foo" "1 foo" "foo 1" ")" "$$"
test:
	@export R_HOME=$(FRAMEWORK_PATH)/R.Framework/Resources; \
	for TEST in $(TESTS); do \
	  echo "  $$TEST:"; \
	  echo -n "    output: "; \
	  echo "$$TEST" | $(abspath $(TARGET)) --slave --vanilla --no-readline; \
	  echo -n "    return: $$?"; \
	  echo; \
	done

test.sh

#! /bin/bash

declare -a R_VERSIONS=(
  /Library/Frameworks
  /usr/local/Cellar/r/3.2.5
  /usr/local/Cellar/r/3.3.0
)

for FRAMEWORK_PATH in ${R_VERSIONS[@]}; do
  export FRAMEWORK_PATH
  echo "$FRAMEWORK_PATH:"
  # homebrew libR.dylib has a reference to /usr/local/opt/r/.../libR.dylib :(
  if [[ $FRAMEWORK_PATH =~ /([0-9a-zA-Z_-]+)/([0-9.]+)$ ]]; then
    brew switch ${BASH_REMATCH[1]} ${BASH_REMATCH[2]} > /dev/null
  fi
  make clean all test
  echo
done