iverilog/configure.in

dnl Process this file with autoconf to produce a configure script.
AC_INIT(netlist.h)

dnl Checks for programs.
AC_PROG_CC
AC_PROG_CXX
AC_CHECK_TOOL(STRIP, strip, true)
AC_CHECK_HEADERS(getopt.h)
AC_CHECK_HEADER(ipal.h, HAVE_IPAL=yes, HAVE_IPAL=)
AC_PROG_INSTALL
AC_CHECK_LIB(dl,main,[DLLIB=-ldl])
AC_SUBST(DLLIB)
AC_CANONICAL_HOST
# $host

AC_SUBST(HAVE_IPAL)

#######################
## test for underscores. The vpi module loader in vvm needs to know this
## in order to know the name of the start symbol for the .vpi module.
#######################

AC_CYGWIN
AC_EXEEXT
AC_SUBST(EXEEXT)

AC_MSG_CHECKING("for leading and/or trailing underscores")
cat << EOF > underscore.c
       void underscore(void){}
EOF
$CC -shared -c underscore.c > /dev/null 2>&1

CC_LEADING_UNDERSCORE=no
CC_TRAILING_UNDERSCORE=no

output=`nm underscore.o|grep _underscore 2>&1`
if test ! -z "$output" -a -z "$CYGWIN" ; then
  CC_LEADING_UNDERSCORE=yes
  AC_DEFINE(NEED_LU)
fi

PICFLAG=-fPIC

if test ! -z "$CYGWIN" ; then
  PICFLAG=
fi

AC_SUBST(CYGWIN)
AC_SUBST(PICFLAG)

output=`nm underscore.o|grep underscore_ 2>&1`
if test ! -z "$output"; then
  CC_TRAILING_UNDERSCORE=yes
  AC_DEFINE(NEED_TU)
fi

if test "$CC_LEADING_UNDERSCORE" = yes; then
  AC_DEFINE(WLU)
fi
if test "$CC_TRAILING_UNDERSCORE" = yes; then
  AC_DEFINE(WTU)
fi

rm underscore.c underscore.o

AC_MSG_RESULT("$CC_LEADING_UNDERSCORE $CC_TRAILING_UNDERSCORE")

#######################
## end of test for underscores
#######################

# The -rdynamic flag is used by iverilog when compiling the target,
# to know how to export symbols of the main program to loadable modules
# that are brought in by -ldl
AC_MSG_CHECKING("for -rdynamic compiler flag")

rdynamic=-rdynamic
case "${host}" in

    *-*-netbsd*)
	rdynamic="-Wl,--export-dynamic"
	;;

    *-*-solaris*)
	rdynamic=""
	;;

    *-*-cygwin*)
	rdynamic=""
	;;

esac

AC_SUBST(rdynamic)

AC_MSG_RESULT($rdynamic)

AC_MSG_CHECKING("for shared library build flag")
shared=-shared
case "${host}" in
     *-*-cygwin*)
        shared="-mdll -Wl,--enable-auto-image-base"
	;;
esac

AC_SUBST(shared)

AC_MSG_RESULT($shared)



AC_OUTPUT(Makefile vpi/Makefile ivlpp/Makefile vvm/Makefile driver/Makefile tgt-null/Makefile tgt-stub/Makefile tgt-verilog/Makefile tgt-pal/Makefile)