configure

#!/bin/sh

# System dependent config script to deal with
# CLANG / LLVM issues through custom compiler flags

# taken from Writing R Extensions, 1.2. Configure and cleanup
: ${R_HOME=`R RHOME`}
if test -z "${R_HOME}"; then
echo "could not determine R_HOME"
exit 1
fi

# determine the Fortran 9x compiler
FC="`"${R_HOME}/bin/R" CMD config FC`"

# grab system specific flags already set
SFLAGS="`"${R_HOME}/bin/R" CMD config FCFLAGS`"

# Use --version output to determine the compiler
# A different compiler will either accept --version and print something
# else or fail due to "unknown argument". In both cases the branch will
# 
# use this routine to create the header / start of the Makevars file
# if "$FC" --version 2>/dev/null | grep -q 'flang'; then
# echo "PKG_FCFLAGS =  $SFLAGS -fc-prototypes-external" > src/Makevars
# fi

# Complete the Makevars file with known system agnostic settings
cat src/Makevars.in >> src/Makevars