dnl Checks for programs.

AC_PROG_CPP

dnl Check to see what flags are required to get stdin into cpp.

dnl Note that we need to look at the output, since the C compiler might

dnl not raise an error when no input files are named on the cmd line.

dnl (This is a somewhat modified version of AC_EGREP_CPP)

dnl AC_TRY_CPPSTDIN(PATTERN, PROGRAM, [ACTION-IF-FOUND [,

dnl ACTION-IF-NOT-FOUND]])

AC_DEFUN(AC_TRY_CPPSTDIN,

[AC_REQUIRE_CPP()dnl

cat > conftest.$ac_ext <<EOF

[#]line __oline__ "configure"

#include "confdefs.h"

[$2]

EOF

dnl eval is necessary to expand ac_cpp.

dnl Ultrix and Pyramid sh refuse to redirect output of eval, so use subshell.

if (eval "$ac_cpp $CPPSTDIN <conftest.$ac_ext") 2>&AC_FD_CC |

grep "$1" >/dev/null 2>&1; then

ifelse([$3], , :, [rm -rf conftest*

$3])

ifelse([$4], , , [else

rm -rf conftest*

$4

])dnl

fi

rm -f conftest*

])

AC_MSG_CHECKING(how to use cpp with stdin)

if test -z "$CPPSTDIN"; then

AC_CACHE_VAL(ac_cv_cpp_stdin,

[ CPPSTDIN="-"

AC_TRY_CPPSTDIN([^Find Me Or Else],

[#include <assert.h>

Find Me Or Else], , CPPSTDIN="")

ac_cv_cpp_stdin="$CPPSTDIN"])

CPPSTDIN="$ac_cv_cpp_stdin"

else

ac_cv_cpp_stdin="$CPPSTDIN"

fi

AC_MSG_RESULT($CPP $CPPSTDIN)

AC_SUBST(CPPSTDIN)

AC_SUBST(PORTNAME)

AC_SUBST(SRCDIR)

AC_SUBST(LDFLAGS)