ANTICONF

[mdsumner]

This works as a standalone ./configure no need for configure.ac/autoconf

# Anticonf (tm) script by Jeroen Ooms (2019) 
# Modified for vapour MDSumner 2019-09-24
# 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="gdal"
PKG_DEB_NAME="libgdal-dev"
PKG_RPM_NAME="libgdal-devel"
PKG_CSW_NAME="libgdal_dev"
PKG_TEST_HEADER="<ogr_api.h>"
PKG_LIBS="-lgdal"
PKG_CFLAGS=""

# Use pkg-config if available
gdal-config --version >/dev/null 2>&1
if [ $? -eq 0 ]; then
  PKGCONFIG_CFLAGS=`gdal-config --cflags`
  PKGCONFIG_CPPFLAGS=`gdal-config --cflags`
  case "$PKGCONFIG_CFLAGS" in
    *GDALSTATICLIB*) PKGCONFIG_LIBS=`gdal-config --libs --static ${PKG_CONFIG_NAME}`;;
    *) PKGCONFIG_LIBS=`gdal-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" ] || [ "$PKGCONFIG_LIBS" ]; then
  echo "Found pkg-config cflags and libs and cppflags!"
  PKG_CFLAGS=${PKGCONFIG_CFLAGS}
  PKG_LIBS=${PKGCONFIG_LIBS}
  PKG_CPPFLAGS=${PKGCONFIG_CPPFLAGS}
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"
echo "Using PKG_CPPFLAGS=$PKG_CPPFLAGS"
# Test configuration
echo "#include $PKG_TEST_HEADER" | ${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 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 "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|@PKG_CPPFLAGS@|$PKG_CPPFLAGS|" -e "s|@PKG_LIBS@|$PKG_LIBS|" src/Makevars.in > src/Makevars

echo "Updated Makevars"
cat src/Makevars

# Extract curlopt symbols
##echo '#include <curl/curl.h>' | ${CC} ${CPPFLAGS} ${PKG_CFLAGS} ${CFLAGS} -E -xc - | grep "^[ \t]*CURLOPT_.*," | sed s/,// > tools/option_table.txt

# Success
exit 0

[mdsumner]

keep this alive see https://github.com/mdsumner/anticonf/issues/1#issuecomment-925502157

got it in a project (user mdsumner on gdalbuilder):

https://github.com/mdsumner/nectar/blob/master/gdalbuilder.md

I reckon this will be enough, we can always add the old rgdal tests in an optional "grind" version of configure, or demonstrate that it's all done on CI/rhub etc with CRAN-alike configurations