configure

#!/usr/bin/env sh

PKG_CONFIG_NAME="libuv"
LIBUV_VERSION_REQUIRED="$PKG_CONFIG_NAME >= 1.43 $PKG_CONFIG_NAME < 2"

# If unset (default), will try to find libuv on system and fall back to bundled
# If true (case insensitive), will not look for system library
# If false, will not fall back to bundled if system library not found
USE_BUNDLED_LIBUV=`echo $USE_BUNDLED_LIBUV | tr '[:upper:]' '[:lower:]'`

bundle_libuv () {
  echo "** Using bundled copy of libuv"
  PKG_CFLAGS="-Ilibuv/include"
  PKG_LIBS="./libuv/.libs/libuv.b"
  # By setting DEPS, this triggers the libuv build in src/Makevars
  DEPS="libuv/.libs/libuv.b"
}

# First, look for suitable libuv installed on the system
if [ "${USE_BUNDLED_LIBUV}" != "true" ] && pkg-config --exists ''"${LIBUV_VERSION_REQUIRED}"'' 2>&1; then
  LIB_DIR="`pkg-config --variable=prefix --silence-errors ${PKG_CONFIG_NAME}`"
  PKG_CFLAGS=`pkg-config --cflags --silence-errors ${PKG_CONFIG_NAME}`
  PKG_LIBS=`pkg-config --libs ${PKG_CONFIG_NAME}`
  DEPS=""
  if [ `uname -s` = "Darwin" ]; then
    # We need to do static linking, but the macOS linker always prefers dynamic
    # so we'll look for libuv.a and explicitly link to it if available
    if [ -f "${LIB_DIR}/lib/libuv.a" ]; then
      # Use it
      PKG_LIBS="${LIB_DIR}/lib/libuv.a"
      echo "** Using static libuv found by pkg-config in ${LIB_DIR}"
    else
      # libuv.a not there, so fall back
      echo "** pkg-config did not find static libuv"
      bundle_libuv
    fi
  else
    echo "** Using libuv found by pkg-config in ${LIB_DIR}"
  fi
elif [ "${USE_BUNDLED_LIBUV}" != "false" ]; then
  # If not found, use the bundled copy (unless directed otherwise)
  bundle_libuv
else
  echo "** Did not find suitable libuv on your system,"
  echo "** and not building from source because USE_BUNDLED_LIBUV=false."
  echo "** Please install ${LIBUV_VERSION_REQUIRED} or unset USE_BUNDLED_LIBUV"
  exit 1
fi

# For debugging
echo "** PKG_CFLAGS=$PKG_CFLAGS"
echo "** PKG_LIBS=$PKG_LIBS"
# Write to Makevars
sed -e "s|@cflags@|$PKG_CFLAGS|" -e "s|@libs@|$PKG_LIBS|" -e "s|@deps@|$DEPS|" src/Makevars.in > src/Makevars

# Success
exit 0