configure

#! /bin/sh
## For the time being, this is a simple shell script ...

## Test whether a complete GLPK library environment is available,
## e.g. ftp://ftp.gnu.org/gnu/glpk/

## Find the R home directory.
: ${R_HOME=`R RHOME`}
if test -z "${R_HOME}"; then
  echo "Could not determine R_HOME."
  exit 1
fi

R="${R_HOME}/bin/R"

GLPK_LIBS="-lglpk"

## Test whether we can compile and link a minimal program.
rm -f conftest.*

cat > conftest.cc <<EOF
#include <glpk.h>
int main ()
{
   glp_prob *lp;
   lp = glp_create_prob();
   glp_delete_prob(lp);
   return 0;
}
EOF

_R_SHLIB_BUILD_OBJECTS_SYMBOL_TABLES_=false \
  "${R}" CMD SHLIB conftest.cc ${GLPK_LIBS} >/dev/null 2>&1 \
  && "$R" --slave --vanilla -e 'dyn.load("conftest.so")'
status=${?}
if test ${status} -ne 0; then
  rm -f conftest.*o
  GLPK_LIBS="-lglpk -lgmp -lm"
  _R_SHLIB_BUILD_OBJECTS_SYMBOL_TABLES_=false \
    "${R}" CMD SHLIB conftest.cc ${GLPK_LIBS} >/dev/null 2>&1 \
    && "$R" --slave --vanilla -e 'dyn.load("conftest.so")'
  status=${?}
fi

rm -f conftest.*

if test ${status} -eq 0; then
  GLPK_INCLUDE_PATH=
  GLPK_LIB_PATH=
  GLPK_TS=
else    
  GLPK_INCLUDE_PATH="-IGLPK"
  GLPK_LIB_PATH="-LGLPK"
  GLPK_LIBS="-lglpk"
  GLPK_TS="GLPK.ts"
fi

sed -e "s|@GLPK_INCLUDE_PATH@|${GLPK_INCLUDE_PATH}|" \
    -e "s|@GLPK_LIB_PATH@|${GLPK_LIB_PATH}|" \
    -e "s|@GLPK_LIBS@|${GLPK_LIBS}|" \
    -e "s|@GLPK_TS@|${GLPK_TS}|" \
    src/Makevars.in > src/Makevars