AC_INIT([urweb], [20151018])
WORKING_VERSION=1
AC_USE_SYSTEM_EXTENSIONS

# automake 1.12 requires this, but automake 1.11 doesn't recognize it
m4_ifdef([AM_PROG_AR], [AM_PROG_AR])

AM_INIT_AUTOMAKE([-Wall -Werror foreign no-define])
AC_PROG_CC()
AC_PROG_LIBTOOL()
AC_CONFIG_MACRO_DIR([m4])
AC_CONFIG_HEADERS([include/urweb/config.h])

AX_PTHREAD([echo >/dev/null], [echo "Your C compiler does not support POSIX threads."; exit 1])

AX_CHECK_OPENSSL([echo >/dev/null], [echo "You must install OpenSSL development files."; exit 1])

AC_CHECK_PROG(MLTON, mlton, yes, [])

if test [-z $MLTON]; then
    echo "You must install MLton."
    exit 1
fi

AC_CHECK_PROG(MLLEX, mllex, yes, [])

if test [-z $MLLEX]; then
    echo "You must install MLton (to get mllex)."
    exit 1
fi

AC_CHECK_PROG(MLYACC, mlyacc, yes, [])

if test [-z $MLYACC]; then
    echo "You must install MLton (to get mlyacc)."
    exit 1
fi

if test [$prefix = "NONE"]; then
    prefix=/usr/local
fi

if test [-z $BIN]; then
    BIN=$prefix/bin
fi

if test [-z $LIB]; then
    LIB=$prefix/lib
fi

if test [-z $SRCLIB]; then
    SRCLIB=$prefix/lib/urweb
fi

if test [-z $INCLUDE]; then
    INCLUDE=$prefix/include/urweb
fi

if test [-z $SITELISP]; then
    SITELISP=$prefix/share/emacs/site-lisp/urweb-mode
fi

AC_ARG_WITH([emacs],
            [AS_HELP_STRING([--without-emacs],
              [disable installation of Emacs mode])],
            [],
            [with_emacs=yes])

AM_CONDITIONAL(USE_EMACS, test "x$with_emacs" = xyes)

if test [-z $PGHEADER]; then
   AC_CHECK_HEADERS([postgresql/libpq-fe.h],
                    [PGHEADER=postgresql/libpq-fe.h])
fi

if test [-z $PGHEADER]; then
   PGHEADER=libpq-fe.h
fi

if test [-z $MSHEADER]; then
   AC_CHECK_HEADERS([mysql/mysql.h],
                    [MSHEADER=mysql/mysql.h])
fi

if test [-z $MSHEADER]; then
   MSHEADER=mysql.h
fi

if test [-z $SQHEADER]; then
   SQHEADER=sqlite3.h
fi

if test [$WORKING_VERSION = "1"]; then
   VERSION="$VERSION + `hg identify || (cat .hg_archival.txt | grep 'node\:') || echo ?`"
fi

# Clang does not like being passed -pthread, since it's implicit on OS X.
# So let's get rid of that! Here's to hoping it doesn't break Clang
# on other platforms.
AC_MSG_CHECKING([if compiling with clang])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([], [[
#ifndef __clang__
       not clang
#endif
]])],
[CLANG=yes], [CLANG=no])
AC_MSG_RESULT([$CLANG])

if test [$CLANG = "yes"]; then
   PTHREAD_CFLAGS=""
   PTHREAD_LIBS=""
fi

# Check if pthread_t is a scalar or pointer type so we can use the correct
# OpenSSL functions on it.
AC_MSG_CHECKING([if pthread_t is a pointer type])
AC_COMPILE_IFELSE(
  [AC_LANG_PROGRAM(
     [[
#include <pthread.h>
     ]],
     [[
pthread_t a;
*a;
     ]])],
  AC_DEFINE([PTHREAD_T_IS_POINTER], [1], [Define if pthread_t is a pointer.])
    AC_MSG_RESULT(yes),
  AC_MSG_RESULT(no))

AC_SUBST(CC)
AC_SUBST(BIN)
AC_SUBST(LIB)
AC_SUBST(SRCLIB)
AC_SUBST(INCLUDE)
AC_SUBST(SITELISP)
AC_SUBST(CCARGS)
AC_SUBST(MLTONARGS)
AC_SUBST(PGHEADER)
AC_SUBST(MSHEADER)
AC_SUBST(SQHEADER)
AC_SUBST(VERSION)
AC_SUBST(PTHREAD_CFLAGS)
AC_SUBST(PTHREAD_LIBS)

AC_CONFIG_FILES([
        Makefile
        src/c/Makefile
        src/config.sml
])

AC_OUTPUT()

cat <<EOF

Ur/Web configuration:
  bin directory:       BIN            $BIN
  lib directory:       LIB            $LIB
  src lib directory:   SRCLIB         $SRCLIB
  include directory:   INCLUDE        $INCLUDE
  site-lisp directory: SITELISP       $SITELISP
  C compiler:          CC             $CC
  Extra CC args:       CCARGS         $CCARGS  
  Extra MLTON args:    MLTONARGS      $MLTONARGS
  Postgres C header:   PGHEADER       $PGHEADER
  MySQL C header:      MSHEADER       $MSHEADER
  SQLite C header:     SQHEADER       $SQHEADER
  OpenSSL:             OPENSSL_LIBS   $OPENSSL_LIBS
  pthreads:            PTHREAD_CFLAGS $PTHREAD_CFLAGS
                       PTHREAD_LIBS   $PTHREAD_LIBS

  Version:             $VERSION
EOF