configure.in

cygwin, 著名的在win32下模拟unix操作系统的东东

dnl Autoconf configure script for winsup/regexp
dnl Copyright 1997,1998,1999,2000,2001 Red Hat, Inc.
dnl
dnl This file is part of Cygwin.
dnl 
dnl This software is a copyrighted work licensed under the terms of the
dnl Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
dnl details.

dnl Process this file with autoconf to produce a configure script.

AC_PREREQ(2.12)
AC_INIT(cygwin-api.in.sgml)

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

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 $ac_cv_prog_cc_g = yes; then
    CFLAGS="-g -O2"
  else
    CFLAGS="-O2"
  fi
  if test "$ac_test_CXXFLAGS" != set; then
    CXXFLAGS='$(CFLAGS)'
  fi
else
  GCC=
  test "${CFLAGS+set}" = set || CFLAGS="-g"
fi
])

AC_CANONICAL_SYSTEM

LIB_AC_PROG_CC

AC_SUBST(build_exeext)

AC_OUTPUT(Makefile)