configure

#!/usr/bin/env bash
# Anticonf (tm) script by Jeroen Ooms (2017)
# 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, libsasl2-dev"
PKG_RPM_NAME="openssl-devel, cyrus-sasl-devel"
PKG_CSW_NAME="libssl_dev, sasl_dev"
PKG_BREW_NAME="openssl"
PKG_TEST_1="<openssl/evp.h>"
PKG_TEST_2="<sasl/sasl.h>"
SASL_LIBS="-lsasl2"

# Hack for solaris
if [ $(uname) = "SunOS" ]; then
  SASL_LIBS="-lsasl"
fi

# Default
PKG_LIBS="-lssl -lcrypto $SASL_LIBS"

# Use pkg-config if openssl 1.0 is available
pkg-config ${PKG_CONFIG_NAME} --atleast-version=1.0
if [ $? -eq 0 ]; then
  PKGCONFIG_CFLAGS="$(pkg-config --cflags --silence-errors ${PKG_CONFIG_NAME})"
  PKGCONFIG_LIBS="$(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_CFLAGS="-I$INCLUDE_DIR $PKG_CFLAGS"
  PKG_LIBS="-L$LIB_DIR $PKG_LIBS"
elif [ "$PKGCONFIG_CFLAGS" ] || [ "$PKGCONFIG_LIBS" ]; then
  echo "Found pkg-config cflags and libs!"
  PKG_CFLAGS="${PKGCONFIG_CFLAGS}"
  PKG_LIBS="${SASL_LIBS} ${PKGCONFIG_LIBS}"
fi

# OpenSSL on OSX 10.11 is deprecated but currently keg-only in brew (not linked)
if [[ "$OSTYPE" == "darwin"* ]]; then
  if [ $(command -v brew) ]; then
    BREWDIR=$(brew --prefix)
  else
    curl -sfL "https://jeroen.github.io/autobrew/$PKG_BREW_NAME" > $TMPDIR/autobrew
    source $TMPDIR/autobrew
  fi
  PKG_CFLAGS="-I$BREWDIR/opt/$PKG_BREW_NAME/include"
  PKG_LIBS="-L$BREWDIR/opt/$PKG_BREW_NAME/lib -lssl -lcrypto $SASL_LIBS"
fi

# Apple has deprecated SASL but there is no alternative yet
if [[ "$OSTYPE" == "darwin"* ]]; then
  PKG_CFLAGS="$PKG_CFLAGS -Wno-deprecated-declarations"
fi

# Linux, MacOS and Solaris use libresolv
if [[ "$OSTYPE" != *"bsd"* ]]; then
  PKG_LIBS="$PKG_LIBS -lresolv"
fi

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

# Find compiler
CC=$(${R_HOME}/bin/R CMD config CC)
CFLAGS=$(${R_HOME}/bin/R CMD config CFLAGS)
CPPFLAGS=$(${R_HOME}/bin/R CMD config CPPFLAGS)

# Test configuration
echo "#include $PKG_TEST_1" | ${CC} ${CPPFLAGS} ${PKG_CFLAGS} ${CFLAGS} -E -xc - >/dev/null 2>&1 || R_CONFIG_ERROR=1;
echo "#include $PKG_TEST_2" | ${CC} ${CPPFLAGS} ${PKG_CFLAGS} ${CFLAGS} -E -xc - >/dev/null 2>&1 || R_CONFIG_ERROR=1;

# Customize the error
if [ $R_CONFIG_ERROR ]; then
  echo "------------------------- ANTICONF ERROR ---------------------------"
  echo "Configuration failed because $PKG_CONFIG_NAME/sasl 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

# Feature test for 'sasl_client_done'
cd src
${CC} ./tests/has_sasl_client_done.c ${CPPFLAGS} ${PKG_CFLAGS} ${CFLAGS} ${PKG_LIBS} >/dev/null 2>&1 && HAS_SASL_CLIENT_DONE=1;
if [ $HAS_SASL_CLIENT_DONE ]; then
  echo "SASL has sasl_client_done."
  PKG_CFLAGS="$PKG_CFLAGS -DMONGOC_HAVE_SASL_CLIENT_DONE"
else
  echo "SASL does not have sasl_client_done."
fi

# Use optimization unless UBSAN is enabled
if [[ $CC == *"undefined"* ]]; then
  echo "Found UBSAN. Not using extra alignment."
else
  echo "Compiling with extra alignment."
  PKG_CFLAGS="$PKG_CFLAGS -DBSON_EXTRA_ALIGN"
fi

# Write to Makevars
sed -e "s|@cflags@|$PKG_CFLAGS|" -e "s|@libs@|$PKG_LIBS|" Makevars.in > Makevars

# Prevent compiler warning about empty unit
if [[ "$OSTYPE" != "linux"* ]]; then
  sed -i.bak 's#mongoc/mongoc-linux-distro-scanner.o##' Makevars
fi

# Success
exit 0