configure

#!/bin/sh
# Anticonf (tm) script by Jeroen Ooms (2024)
# 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="libcurl"
PKG_DEB_NAME="libcurl4-openssl-dev"
PKG_RPM_NAME="libcurl-devel"
PKG_TEST_HEADER="<curl/curl.h>"
PKG_LIBS="-lcurl"
PKG_CFLAGS=""

#export PKG_CONFIG_PATH="/opt/homebrew/opt/curl/lib/pkgconfig"

# Use pkg-config if available
pkg-config --version >/dev/null 2>&1
if [ $? -eq 0 ]; then
  PKGCONFIG_CFLAGS=`pkg-config --cflags ${PKG_CONFIG_NAME}`
  case "$PKGCONFIG_CFLAGS" in
    *CURL_STATICLIB*) PKGCONFIG_LIBS=`pkg-config --libs --static ${PKG_CONFIG_NAME}`;;
    *) PKGCONFIG_LIBS=`pkg-config --libs ${PKG_CONFIG_NAME}`;;
  esac
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=${PKGCONFIG_LIBS}
fi

# 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`

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

# Test configuration
echo "#include $PKG_TEST_HEADER" | ${CC} ${CPPFLAGS} ${PKG_CFLAGS} ${CFLAGS} -E -xc - >/dev/null 2>configure.log

# Customize the error
if [ $? -ne 0 ]; then
  echo "--------------------------- [ANTICONF] --------------------------------"
  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 "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 "-------------------------- [ERROR MESSAGE] ---------------------------"
  cat configure.log
  echo "--------------------------------------------------------------------"
  exit 1
fi

# On curl < 7.62 (RHEL-8) enable the fallback
#TEST_ADA_PARSER=1
if [ -z "$TEST_ADA_PARSER" ] && pkg-config --atleast-version="7.80" $PKG_CONFIG_NAME; then
  echo "Found recent recent version of libcurl"
elif [ "$TEST_ADA_PARSER" ] || ! ${R_HOME}/bin/Rscript --vanilla tools/testversion.R "7.62"; then
  tar xf tools/ada.tar.gz -C src
  PKG_CFLAGS="$PKG_CFLAGS -DUSE_ADA_PARSER"
  echo "CXX_STD=CXX17" >> src/Makevars.in
elif [ `uname` = "Darwin" ] && ${R_HOME}/bin/Rscript --vanilla tools/testversion.R "7.80"; then
  PKG_CFLAGS="$PKG_CFLAGS -DENABLE_MACOS_POLYFILL"
fi

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

# Legacy option list (remove this when RHEL8 is EOL)
echo '#include <curl/curl.h>' | ${CC} ${CPPFLAGS} ${PKG_CFLAGS} ${CFLAGS} -E -xc - \
  | grep "^[ \t]*CURLOPT_.*," | sed s/,// > tools/option_table.txt

# Success
exit 0