configure.in

cygwin, 著名的在win32下模拟unix操作系统的东东

dnl Copyright (c) 2001, Red Hat, Inc.
dnl
dnl     This program is free software; you can redistribute it and/or modify
dnl     it under the terms of the GNU General Public License as published by
dnl     the Free Software Foundation; either version 2 of the License, or
dnl     (at your option) any later version.
dnl
dnl     A copy of the GNU General Public License can be found at
dnl     http://www.gnu.org/
dnl
dnl Written by Christopher Faylor <[e-mail]>
dnl Changed for subauth subdir by Corinna Vinschen <[e-mail]>

dnl Autoconf configure script for Cygwin utilities.
dnl
dnl Process this file with autoconf to produce a configure script.

AC_PREREQ(2.12)

AC_INIT(Makefile.in)

dnl FIXME: We temporarily define our own version of AC_PROG_CC.  This is
dnl copied from autoconf 2.12, but does not call AC_PROG_CC_WORKS.  We
dnl are probably using a cross compiler, which will not be able to fully
dnl link an executable.  This should really be fixed in autoconf
dnl itself.

AC_DEFUN(LIB_AC_PROG_CC,
[AC_BEFORE([$0], [AC_PROG_CPP])dnl
AC_CHECK_PROG(CC, gcc, gcc)
if test -z "$CC"; then
  AC_CHECK_PROG(CC, cc, cc, , , /usr/ucb/cc)
  test -z "$CC" && AC_MSG_ERROR([no acceptable cc found in \$PATH])
fi

AC_PROG_CC_GNU

if test $ac_cv_prog_gcc = yes; then
  GCC=yes
dnl Check whether -g works, even if CFLAGS is set, in case the package
dnl plays around with CFLAGS (such as to build both debugging and
dnl normal versions of a library), tasteless as that idea is.
  ac_test_CFLAGS="${CFLAGS+set}"
  ac_save_CFLAGS="$CFLAGS"
  CFLAGS=
  AC_PROG_CC_G
  if test "$ac_test_CFLAGS" = set; then
    CFLAGS="$ac_save_CFLAGS"
  elif test $ac_cv_prog_cc_g = yes; then
    CFLAGS="-g -O2"
  else
    CFLAGS="-O2"
  fi
else
  GCC=
  test "${CFLAGS+set}" = set || CFLAGS="-g"
fi
])

AC_DEFUN(LIB_AC_PROG_CXX,
[AC_BEFORE([$0], [AC_PROG_CPP])dnl
AC_CHECK_TOOL(CXX, g++, g++)
if test -z "$CXX"; then
  AC_CHECK_PROG(CXX, c++, c++, , , )
  test -z "$CC" && AC_MSG_ERROR([no acceptable cc found in \$PATH])
fi

CXXFLAGS='$(CFLAGS)'
])

AC_CANONICAL_SYSTEM

LIB_AC_PROG_CC
LIB_AC_PROG_CXX

AC_ARG_PROGRAM

if test "x$cross_compiling" = "xyes"; then
  if test "x$program_transform_name" = "xs,x,x,"; then
    program_transform_name=""
  fi
  if test "x$program_transform_name" = "x"; then
    program_transform_name="s,^,$host-,"
  else
    program_transform_name="$program_transform_name -e s,^,$host-,"
  fi
fi

AC_PROG_INSTALL

AC_OUTPUT(Makefile cygsuba.def:cygsuba.din)