programs.m4

autoconf 2.59版,可用于redhat系统.用于编译原码,编写makefile文件.

# This file is part of Autoconf.                       -*- Autoconf -*-
# Checking for programs.
# Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002
# Free Software Foundation, Inc.

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# it under the terms of the GNU General Public License as published by
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#
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# GNU General Public License for more details.
#
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# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.

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# permission to copy, distribute and modify the configure scripts that
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# such potential, you must delete any notice of this special exception
# to the GPL from your modified version.
#
# Written by David MacKenzie, with help from
# Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor,
# Roland McGrath, Noah Friedman, david d zuhn, and many others.


## ----------------------------- ##
## Generic checks for programs.  ##
## ----------------------------- ##


# AC_CHECK_PROG(VARIABLE, PROG-TO-CHECK-FOR,
#               [VALUE-IF-FOUND], [VALUE-IF-NOT-FOUND],
#               [PATH], [REJECT])
# -----------------------------------------------------
AC_DEFUN([AC_CHECK_PROG],
[# Extract the first word of "$2", so it can be a program name with args.
set dummy $2; ac_word=$[2]
AC_MSG_CHECKING([for $ac_word])
AC_CACHE_VAL(ac_cv_prog_$1,
[if test -n "$$1"; then
  ac_cv_prog_$1="$$1" # Let the user override the test.
else
m4_ifvaln([$6],
[  ac_prog_rejected=no])dnl
_AS_PATH_WALK([$5],
[for ac_exec_ext in '' $ac_executable_extensions; do
  if AS_EXECUTABLE_P(["$as_dir/$ac_word$ac_exec_ext"]); then
m4_ifvaln([$6],
[    if test "$as_dir/$ac_word$ac_exec_ext" = "$6"; then
       ac_prog_rejected=yes
       continue
     fi])dnl
    ac_cv_prog_$1="$3"
    echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&AS_MESSAGE_LOG_FD
    break 2
  fi
done])
m4_ifvaln([$6],
[if test $ac_prog_rejected = yes; then
  # We found a bogon in the path, so make sure we never use it.
  set dummy $ac_cv_prog_$1
  shift
  if test $[@%:@] != 0; then
    # We chose a different compiler from the bogus one.
    # However, it has the same basename, so the bogon will be chosen
    # first if we set $1 to just the basename; use the full file name.
    shift
    ac_cv_prog_$1="$as_dir/$ac_word${1+' '}$[@]"
m4_if([$2], [$4],
[  else
    # Default is a loser.
    AC_MSG_ERROR([$1=$6 unacceptable, but no other $4 found in dnl
m4_default([$5], [\$PATH])])
])dnl
  fi
fi])dnl
dnl If no 4th arg is given, leave the cache variable unset,
dnl so AC_CHECK_PROGS will keep looking.
m4_ifvaln([$4],
[  test -z "$ac_cv_prog_$1" && ac_cv_prog_$1="$4"])dnl
fi])dnl
$1=$ac_cv_prog_$1
if test -n "$$1"; then
  AC_MSG_RESULT([$$1])
else
  AC_MSG_RESULT([no])
fi
AC_SUBST($1)dnl
])# AC_CHECK_PROG


# AC_CHECK_PROGS(VARIABLE, PROGS-TO-CHECK-FOR, [VALUE-IF-NOT-FOUND],
#                [PATH])
# ------------------------------------------------------------------
AC_DEFUN([AC_CHECK_PROGS],
[for ac_prog in $2
do
  AC_CHECK_PROG([$1], [$ac_prog], [$ac_prog], , [$4])
  test -n "$$1" && break
done
m4_ifvaln([$3], [test -n "$$1" || $1="$3"])])


# AC_PATH_PROG(VARIABLE, PROG-TO-CHECK-FOR, [VALUE-IF-NOT-FOUND], [PATH])
# -----------------------------------------------------------------------
AC_DEFUN([AC_PATH_PROG],
[# Extract the first word of "$2", so it can be a program name with args.
set dummy $2; ac_word=$[2]
AC_MSG_CHECKING([for $ac_word])
AC_CACHE_VAL([ac_cv_path_$1],
[case $$1 in
  [[\\/]]* | ?:[[\\/]]*)
  ac_cv_path_$1="$$1" # Let the user override the test with a path.
  ;;
  *)
  _AS_PATH_WALK([$4],
[for ac_exec_ext in '' $ac_executable_extensions; do
  if AS_EXECUTABLE_P(["$as_dir/$ac_word$ac_exec_ext"]); then
    ac_cv_path_$1="$as_dir/$ac_word$ac_exec_ext"
    echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&AS_MESSAGE_LOG_FD
    break 2
  fi
done])
dnl If no 3rd arg is given, leave the cache variable unset,
dnl so AC_PATH_PROGS will keep looking.
m4_ifvaln([$3],
[  test -z "$ac_cv_path_$1" && ac_cv_path_$1="$3"])dnl
  ;;
esac])dnl
AC_SUBST([$1], [$ac_cv_path_$1])
if test -n "$$1"; then
  AC_MSG_RESULT([$$1])
else
  AC_MSG_RESULT([no])
fi
])# AC_PATH_PROG


# AC_PATH_PROGS(VARIABLE, PROGS-TO-CHECK-FOR, [VALUE-IF-NOT-FOUND],
#               [PATH])
# -----------------------------------------------------------------
AC_DEFUN([AC_PATH_PROGS],
[for ac_prog in $2
do
  AC_PATH_PROG([$1], [$ac_prog], , [$4])
  test -n "$$1" && break
done
m4_ifvaln([$3], [test -n "$$1" || $1="$3"])dnl
])




## -------------------------- ##
## Generic checks for tools.  ##
## -------------------------- ##


# AC_CHECK_TOOL_PREFIX
# --------------------
AU_DEFUN([AC_CHECK_TOOL_PREFIX])


# AC_PATH_TOOL(VARIABLE, PROG-TO-CHECK-FOR, [VALUE-IF-NOT-FOUND], [PATH])
# -----------------------------------------------------------------------
# (Use different variables $1 and ac_pt_$1 so that cache vars don't conflict.)
AC_DEFUN([AC_PATH_TOOL],
[if test -n "$ac_tool_prefix"; then
  AC_PATH_PROG([$1], [${ac_tool_prefix}$2], , [$4])
fi
if test -z "$ac_cv_path_$1"; then
  ac_pt_$1=$$1
  AC_PATH_PROG([ac_pt_$1], [$2], [$3], [$4])
  $1=$ac_pt_$1
else
  $1="$ac_cv_path_$1"
fi
])# AC_PATH_TOOL


# AC_CHECK_TOOL(VARIABLE, PROG-TO-CHECK-FOR, [VALUE-IF-NOT-FOUND], [PATH])
# ------------------------------------------------------------------------
# (Use different variables $1 and ac_ct_$1 so that cache vars don't conflict.)
AC_DEFUN([AC_CHECK_TOOL],
[if test -n "$ac_tool_prefix"; then
  AC_CHECK_PROG([$1], [${ac_tool_prefix}$2], [${ac_tool_prefix}$2], , [$4])
fi
if test -z "$ac_cv_prog_$1"; then
  ac_ct_$1=$$1
  AC_CHECK_PROG([ac_ct_$1], [$2], [$2], [$3], [$4])
  $1=$ac_ct_$1
else
  $1="$ac_cv_prog_$1"
fi
])# AC_CHECK_TOOL


# AC_CHECK_TOOLS(VARIABLE, PROGS-TO-CHECK-FOR, [VALUE-IF-NOT-FOUND],
#                [PATH])
# ------------------------------------------------------------------
# Check for each tool in PROGS-TO-CHECK-FOR with the cross prefix. If
# none can be found with a cross prefix, then use the first one that
# was found without the cross prefix.
AC_DEFUN([AC_CHECK_TOOLS],
[if test -n "$ac_tool_prefix"; then
  for ac_prog in $2
  do
    AC_CHECK_PROG([$1],
		  [$ac_tool_prefix$ac_prog], [$ac_tool_prefix$ac_prog],,
		  [$4])
    test -n "$$1" && break
  done
fi
if test -z "$$1"; then
  ac_ct_$1=$$1
  AC_CHECK_PROGS([ac_ct_$1], [$2], [$3], [$4])
  $1=$ac_ct_$1
fi
])# AC_CHECK_TOOLS



## ---------------- ##
## Specific tests.  ##
## ---------------- ##

# Please, keep this section sorted.
# (But of course when keeping related things together).

# Check for gawk first since it's generally better.