configure.ac

# require at least autoconf 2.69
AC_PREREQ([2.69])

# Process this file with autoconf to produce a configure script.
AC_INIT([proxyC],[0.4.1])

# Ensure C++ is set up as R expects
: ${R_HOME=`R RHOME`}
if test -z "${R_HOME}"; then
    AC_MSG_ERROR([Could not determine R_HOME.])
fi
CXX=`"${R_HOME}/bin/R" CMD config CXX`
CXXFLAGS=`"${R_HOME}/bin/R" CMD config CXXFLAGS`
CPPFLAGS=`"${R_HOME}/bin/R" CMD config CPPFLAGS`
LDFLAGS=`"${R_HOME}/bin/R" CMD config LDFLAGS`
AC_LANG(C++)
AC_REQUIRE_CPP
AC_PROG_CC
AC_PROG_CXX

# Default to no Intel TBB
TBBFLAGS=
TBBLIBS=

# If tbb/tbb.h and libtbb are found, define TBB and add -ltbb

AC_MSG_CHECKING([tbb available for compiling and linking:])
[cat > libtbb_test.cpp <<_EOCONF
#include <tbb/tbb.h>

int main() {
  int H = 1000;
  tbb::concurrent_vector<bool> v(H, false);
  tbb::parallel_for(tbb::blocked_range<int>(0, H), [&](tbb::blocked_range<int> r) {
    for (int h = r.begin(); h < r.end(); ++h) {
        v[h] = true;
    }
  });
  if (std::find(v.begin(), v.end(), false) == v.end()) { // all true
    return 0;
  } else {
    return 1;
  }
}
_EOCONF]
${CXX} ${CXXFLAGS} -o libtbb_test libtbb_test.cpp -ltbb 2> errors.txt

if test `echo $?` -ne 0 ; then
    AC_MSG_RESULT(no)
    AC_MSG_WARN([parallel computing is disabled because the Intel TBB devel package is absent])
else
    AC_MSG_RESULT(yes)
    TBBFLAGS=-DTBB
    TBBLIBS=-ltbb
fi
rm -f libtbb_test.cpp libtbb_test errors.txt
# Now substitute these variables in src/Makevars.in to create src/Makevars
AC_SUBST(TBB_CFLAGS, ${TBBFLAGS})
AC_SUBST(TBB_LIBS, ${TBBLIBS})

AC_MSG_NOTICE([Package CPP flags: ${TBB_CFLAGS}])
AC_MSG_NOTICE([Package LIBS: ${TBB_LIBS}])

AC_CONFIG_FILES([src/Makevars])
AC_OUTPUT