configure.in

gcc-2.95.3 Linux下最常用的C编译器

# Process this file with autoconf to produce a configure script.
#   Copyright (C) 1995, 1997, 1998 Free Software Foundation, Inc.
#   Contributed by Dave Love ([e-mail]).
#
#This file is part of GNU Fortran.
#
#GNU Fortran is free software; you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation; either version 2, or (at your option)
#any later version.
#
#GNU Fortran is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU General Public License for more details.
#
#You should have received a copy of the GNU General Public License
#along with GNU Fortran; see the file COPYING.  If not, write to
#the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
#02111-1307, USA.

AC_PREREQ(2.12.1)
AC_INIT(getarg_.c)

dnl Checks for programs.
# For g77 we'll set CC to point at the built gcc, but this will get it into
# the makefiles
AC_PROG_CC

test "$AR" || AR=ar
AC_SUBST(AR)
AC_PROG_MAKE_SET

dnl Checks for libraries.

dnl Checks for header files.
# Sanity check for the cross-compilation case:
AC_CHECK_HEADER(stdio.h,:,
  [AC_MSG_ERROR([Can't find stdio.h.
You must have a usable C system for the target already installed, at least
including headers and, preferably, the library, before you can configure
the G77 runtime system.  If necessary, install gcc now with \`LANGUAGES=c',
then the target library, then build with \`LANGUAGES=f77'.])])

AC_HEADER_STDC
dnl We could do this if we didn't know we were using gcc
dnl AC_MSG_CHECKING(for prototype-savvy compiler)
dnl AC_CACHE_VAL(g77_cv_sys_proto,                
dnl   [AC_TRY_LINK(,                             
dnl dnl looks screwy because TRY_LINK expects a function body
dnl    [return 0;} int foo (int * bar) {],       
dnl    g77_cv_sys_proto=yes,                      
dnl    [g77_cv_sys_proto=no                       
dnl     AC_DEFINE(KR_headers)])])                
dnl AC_MSG_RESULT($g77_cv_sys_proto)              

AC_MSG_CHECKING(for posix)
AC_CACHE_VAL(g77_cv_header_posix,
  AC_EGREP_CPP(yes,
  [#include <sys/types.h>
#include <unistd.h>
#ifdef _POSIX_VERSION
  yes
#endif
], 
  g77_cv_header_posix=yes,
  g77_cv_header_posix=no))
AC_MSG_RESULT($g77_cv_header_posix)

# We can rely on the GNU library being posix-ish.  I guess checking the 
# header isn't actually like checking the functions, though...
AC_MSG_CHECKING(for GNU library)
AC_CACHE_VAL(g77_cv_lib_gnu,
  AC_EGREP_CPP(yes,
    [#include <stdio.h>
#ifdef __GNU_LIBRARY__
  yes
#endif
], 
  g77_cv_lib_gnu=yes, g77_cv_lib_gnu=no))
AC_MSG_RESULT($g77_cv_lib_gnu)

dnl Checks for library functions.
AC_TYPE_SIGNAL
# we'll get atexit by default
if test $ac_cv_header_stdc != yes; then
AC_CHECK_FUNC(atexit,
  AC_DEFINE(onexit,atexit),dnl just in case
  [AC_DEFINE(NO_ONEXIT)
  AC_CHECK_FUNC(onexit,,
    [AC_CHECK_FUNC(on_exit,
     AC_DEFINE(onexit,on_exit),)])])
else true
fi

dnl perhaps should check also for remainder
dnl Unfortunately, the message implies we're just checking for -lm...
AC_CHECK_LIB(m,drem,AC_DEFINE(IEEE_drem))

AC_DEFINE(Skip_f2c_Undefs)

AC_OUTPUT(Makefile)

dnl Local Variables:
dnl comment-start: "dnl "
dnl comment-end: ""
dnl comment-start-skip: "\\bdnl\\b\\s *"
dnl End: