configure

# Anticonf (tm) script by Jeroen Ooms (2015)
# This script will query 'pkg-config' for the required cflags and ldflags.
# If pkg-config is unavailable or does not find the library, try setting
# INCLUDE_DIR and LIB_DIR manually via e.g:
# R CMD INSTALL --configure-vars='INCLUDE_DIR=/.../include LIB_DIR=/.../lib'

# Library settings
PKG_CONFIG_NAME="openssl"
PKG_DEB_NAME="libssl-dev"
PKG_RPM_NAME="openssl-devel"
PKG_CSW_NAME="libssl_dev"
PKG_BREW_NAME="openssl"
PKG_TEST_FILE="tools/version.c"
PKG_LIBS="-lssl -lcrypto"
PKG_CXXFLAGS=""

# Use pkg-config if available
pkg-config ${PKG_CONFIG_NAME} --atleast-version=1.0  2>/dev/null
if [ $? -eq 0 ]; then
  PKGCONFIG_CXXFLAGS=`pkg-config --cflags ${PKG_CONFIG_NAME}`
  PKGCONFIG_LIBS=`pkg-config --libs ${PKG_CONFIG_NAME}`
fi

# Note that cflags may be empty in case of success
if [ "$INCLUDE_DIR" ] || [ "$LIB_DIR" ]; then
  echo "Found INCLUDE_DIR and/or LIB_DIR!"
  PKG_CXXFLAGS="-I$INCLUDE_DIR $PKG_CXXFLAGS"
  PKG_LIBS="-L$LIB_DIR $PKG_LIBS"
elif [ "$PKGCONFIG_CXXFLAGS" ] || [ "$PKGCONFIG_LIBS" ]; then
  echo "Found pkg-config cflags and libs!"
  PKG_CXXFLAGS=${PKGCONFIG_CXXFLAGS}
  PKG_LIBS=${PKGCONFIG_LIBS}
else
  case "$OSTYPE" in "darwin"*)
  brew --version 2>/dev/null
  if [ $? -eq 0 ]; then
    BREWDIR=`brew --prefix`
  else
    curl -sfL https://jeroen.github.io/autobrew/$PKG_BREW_NAME > autobrew
    source autobrew
  fi
  PKG_CXXFLAGS="-I$BREWDIR/opt/$PKG_BREW_NAME/include"
  PKG_LIBS="-L$BREWDIR/opt/$PKG_BREW_NAME/lib $PKG_LIBS"
  ;;
  esac
fi

# Add PIC flag for shared lib
# CXX1XPICFLAGS=`${R_HOME}/bin/R CMD config CXX1XPICFLAGS`
# PKG_CXXFLAGS="$PKG_CXXFLAGS $CXX1XPICFLAGS"

# For debugging
echo "Using PKG_CXXFLAGS=$PKG_CXXFLAGS"
echo "Using PKG_LIBS=$PKG_LIBS"

# Find compiler
CXX11VAR=`${R_HOME}/bin/Rscript -e 'if(getRversion() < "3.4") cat("CXX1X") else cat("CXX11")'`
CXX1X=`${R_HOME}/bin/R CMD config "${CXX11VAR}"`
CXX1XFLAGS=`${R_HOME}/bin/R CMD config "${CXX11VAR}FLAGS"`
CPPFLAGS=`${R_HOME}/bin/R CMD config CPPFLAGS`

# Test configuration
${CXX1X} ${CPPFLAGS} ${PKG_CXXFLAGS} ${CXX1XFLAGS} -E ${PKG_TEST_FILE} >/dev/null 2>&1

# Customize the error
if [ $? -ne 0 ]; then
  echo "------------------------- ANTICONF ERROR ---------------------------"
  echo "Configuration failed because $PKG_CONFIG_NAME was not found. Try installing:"
  echo " * deb: $PKG_DEB_NAME (Debian, Ubuntu, etc)"
  echo " * rpm: $PKG_RPM_NAME (Fedora, CentOS, RHEL)"
  echo " * csw: $PKG_CSW_NAME (Solaris)"
  echo " * brew: $PKG_BREW_NAME (Mac OSX)"
  echo "If $PKG_CONFIG_NAME is already installed, check that 'pkg-config' is in your"
  echo "PATH and PKG_CONFIG_PATH contains a $PKG_CONFIG_NAME.pc file. If pkg-config"
  echo "is unavailable you can set INCLUDE_DIR and LIB_DIR manually via:"
  echo "R CMD INSTALL --configure-vars='INCLUDE_DIR=... LIB_DIR=...'"
  echo "--------------------------------------------------------------------"
  exit 1;
fi

# Write to Makevars
sed -e "s|@cxxflags@|$PKG_CXXFLAGS|" -e "s|@libs@|$PKG_LIBS|" src/Makevars.in > src/Makevars

# Success
exit 0