programs.m4

autoconf是一个产生可以自动配置源代码包

# --------------------------------------------------------------------------
# FEATURE-TEST is called repeatedly with $ac_path_VARIABLE set to the
# name of a program in PROGNAME-LIST found in PATH.  FEATURE-TEST must set
# $ac_cv_path_VARIABLE to the path of an acceptable program, or else
# _AC_PATH_PROG_FEATURE_CHECK will report that no acceptable program
# was found, and abort.  If a suitable $ac_path_VARIABLE is found in the
# FEATURE-TEST macro, it can set $ac_path_VARIABLE_found=':' to accept
# that value without any further checks.
m4_define([_AC_PATH_PROG_FEATURE_CHECK],
[# Extract the first word of "$2" to use in msg output
if test -z "$$1"; then
set dummy $2; ac_prog_name=$[2]
AC_CACHE_VAL([ac_cv_path_$1],
[ac_path_$1_found=false
# Loop through the user's path and test for each of PROGNAME-LIST
_AS_PATH_WALK([$4],
[for ac_prog in $2; do
  for ac_exec_ext in '' $ac_executable_extensions; do
    ac_path_$1="$as_dir/$ac_prog$ac_exec_ext"
    AS_EXECUTABLE_P(["$ac_path_$1"]) || continue
    $3
    $ac_path_$1_found && break 3
  done
done
])
])
$1="$ac_cv_path_$1"
if test -z "$$1"; then
  AC_MSG_ERROR([no acceptable $ac_prog_name could be found in dnl
m4_default([$4], [\$PATH])])
fi
AC_SUBST([$1])
else
  ac_cv_path_$1=$$1
fi
])


# _AC_FEATURE_CHECK_LENGTH(PROGPATH, CACHE-VAR, CHECK-CMD, [MATCH-STRING])
# ------------------------------------------------------------------------
# For use as the FEATURE-TEST argument to _AC_PATH_PROG_FEATURE_TEST.
# On each iteration run CHECK-CMD on an input file, storing the value
# of PROGPATH in CACHE-VAR if the CHECK-CMD succeeds.  The input file
# is always one line, starting with only 10 characters, and doubling
# in length at each iteration until approx 10000 characters or the
# feature check succeeds.  The feature check is called at each
# iteration by appending (optionally, MATCH-STRING and) a newline
# to the file, and using the result as input to CHECK-CMD.
m4_define([_AC_FEATURE_CHECK_LENGTH],
[# Check for GNU $1 and select it if it is found.
  _AC_PATH_PROG_FLAVOR_GNU([$$1],
    [$2="$$1" $1_found=:],
  [ac_count=0
  echo $ECHO_N "0123456789$ECHO_C" >"conftest.in"
  while :
  do
    cat "conftest.in" "conftest.in" >"conftest.tmp"
    mv "conftest.tmp" "conftest.in"
    cp "conftest.in" "conftest.nl"
    echo '$4' >> "conftest.nl"
    $3 < "conftest.nl" >"conftest.out" 2>/dev/null || break
    diff "conftest.out" "conftest.nl" >/dev/null 2>&1 || break
    ac_count=`expr $ac_count + 1`
    if test $ac_count -gt ${$1_max-0}; then
      # Best one so far, save it but keep looking for a better one
      $2="$$1"
dnl   # Using $1_max so that each tool feature checked gets its
dnl   # own variable.  Don't reset it otherwise the implied search
dnl   # for best performing tool in a list breaks down.
      $1_max=$ac_count
    fi
    # 10*(2^10) chars as input seems more than enough
    test $ac_count -gt 10 && break
  done
  rm -f conftest.in conftest.tmp conftest.nl conftest.out])
])


# _AC_PATH_PROG_FLAVOR_GNU(PROGRAM-PATH, IF-SUCCESS, [IF-FAILURE])
# ----------------------------------------------------------------
m4_define([_AC_PATH_PROG_FLAVOR_GNU],
[# Check for GNU $1
case `"$1" --version 2>&1` in
*GNU*)
  $2;;
m4_ifval([$3],
[*)
  $3;;
])esac
])# _AC_PATH_PROG_FLAVOR_GNU


# AC_PROG_INSTALL
# ---------------
AN_MAKEVAR([INSTALL], [AC_PROG_INSTALL])
AN_PROGRAM([install], [AC_PROG_INSTALL])
AC_DEFUN([AC_PROG_INSTALL],
[AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
AC_REQUIRE_AUX_FILE([install-sh])dnl
# Find a good install program.  We prefer a C program (faster),
# so one script is as good as another.  But avoid the broken or
# incompatible versions:
# SysV /etc/install, /usr/sbin/install
# SunOS /usr/etc/install
# IRIX /sbin/install
# AIX /bin/install
# AmigaOS /C/install, which installs bootblocks on floppy discs
# AIX 4 /usr/bin/installbsd, which doesn't work without a -g flag
# AFS /usr/afsws/bin/install, which mishandles nonexistent args
# SVR4 /usr/ucb/install, which tries to use the nonexistent group "staff"
# OS/2's system install, which has a completely different semantic
# ./install, which can be erroneously created by make from ./install.sh.
AC_MSG_CHECKING([for a BSD-compatible install])
if test -z "$INSTALL"; then
AC_CACHE_VAL(ac_cv_path_install,
[_AS_PATH_WALK([$PATH],
[# Account for people who put trailing slashes in PATH elements.
case $as_dir/ in
  ./ | .// | /[cC]/* | \
  /etc/* | /usr/sbin/* | /usr/etc/* | /sbin/* | /usr/afsws/bin/* | \
  ?:[\\/]os2[\\/]install[\\/]* | ?:[\\/]OS2[\\/]INSTALL[\\/]* | \
  /usr/ucb/* ) ;;
  *)
    # OSF1 and SCO ODT 3.0 have their own names for install.
    # Don't use installbsd from OSF since it installs stuff as root
    # by default.
    for ac_prog in ginstall scoinst install; do
      for ac_exec_ext in '' $ac_executable_extensions; do
	if AS_EXECUTABLE_P(["$as_dir/$ac_prog$ac_exec_ext"]); then
	  if test $ac_prog = install &&
	    grep dspmsg "$as_dir/$ac_prog$ac_exec_ext" >/dev/null 2>&1; then
	    # AIX install.  It has an incompatible calling convention.
	    :
	  elif test $ac_prog = install &&
	    grep pwplus "$as_dir/$ac_prog$ac_exec_ext" >/dev/null 2>&1; then
	    # program-specific install script used by HP pwplus--don't use.
	    :
	  else
	    ac_cv_path_install="$as_dir/$ac_prog$ac_exec_ext -c"
	    break 3
	  fi
	fi
      done
    done
    ;;
esac])
])dnl
  if test "${ac_cv_path_install+set}" = set; then
    INSTALL=$ac_cv_path_install
  else
    # As a last resort, use the slow shell script.  Don't cache a
    # value for INSTALL within a source directory, because that will
    # break other packages using the cache if that directory is
    # removed, or if the value is a relative name.
    INSTALL=$ac_install_sh
  fi
fi
dnl Do special magic for INSTALL instead of AC_SUBST, to get
dnl relative names right.
AC_MSG_RESULT([$INSTALL])

# Use test -z because SunOS4 sh mishandles braces in ${var-val}.
# It thinks the first close brace ends the variable substitution.
test -z "$INSTALL_PROGRAM" && INSTALL_PROGRAM='${INSTALL}'
AC_SUBST(INSTALL_PROGRAM)dnl

test -z "$INSTALL_SCRIPT" && INSTALL_SCRIPT='${INSTALL}'
AC_SUBST(INSTALL_SCRIPT)dnl

test -z "$INSTALL_DATA" && INSTALL_DATA='${INSTALL} -m 644'
AC_SUBST(INSTALL_DATA)dnl
])# AC_PROG_INSTALL


# AC_PROG_MKDIR_P
# ---------------
# Check whether `mkdir -p' is known to be thread-safe, and fall back to
# install-sh -d otherwise.
#
# Automake 1.8 used `mkdir -m 0755 -p --' to ensure that directories
# created by `make install' are always world readable, even if the
# installer happens to have an overly restrictive umask (e.g. 077).
# This was a mistake.  There are at least two reasons why we must not
# use `-m 0755':
#   - it causes special bits like SGID to be ignored,
#   - it may be too restrictive (some setups expect 775 directories).
#
# Do not use -m 0755 and let people choose whatever they expect by
# setting umask.
#
# We cannot accept any implementation of `mkdir' that recognizes `-p'.
# Some implementations (such as Solaris 8's) are vulnerable to race conditions:
# if a parallel make tries to run `mkdir -p a/b' and `mkdir -p a/c'
# concurrently, both version can detect that a/ is missing, but only
# one can create it and the other will error out.  Consequently we
# restrict ourselves to known race-free implementations.
#
# Automake used to define mkdir_p as `mkdir -p .', in order to
# allow $(mkdir_p) to be used without argument.  As in
#   $(mkdir_p) $(somedir)
# where $(somedir) is conditionally defined.  However we don't do
# that for MKDIR_P.
#  1. before we restricted the check to GNU mkdir, `mkdir -p .' was
#     reported to fail in read-only directories.  The system where this
#     happened has been forgotten.
#  2. in practice we call $(MKDIR_P) on directories such as
#       $(MKDIR_P) "$(DESTDIR)$(somedir)"
#     and we don't want to create $(DESTDIR) if $(somedir) is empty.
#     To support the latter case, we have to write
#       test -z "$(somedir)" || $(MKDIR_P) "$(DESTDIR)$(somedir)"
#     so $(MKDIR_P) always has an argument.
#     We will have better chances of detecting a missing test if
#     $(MKDIR_P) complains about missing arguments.
#  3. $(MKDIR_P) is named after `mkdir -p' and we don't expect this
#     to accept no argument.
#  4. having something like `mkdir .' in the output is unsightly.
#
# On NextStep and OpenStep, the `mkdir' command does not
# recognize any option.  It will interpret all options as
# directories to create.
AN_MAKEVAR([MKDIR_P], [AC_PROG_MKDIR_P])
AC_DEFUN([AC_PROG_MKDIR_P],
[AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
AC_REQUIRE_AUX_FILE([install-sh])dnl
AC_MSG_CHECKING([for a thread-safe mkdir -p])
if test -z "$MKDIR_P"; then
  AC_CACHE_VAL([ac_cv_path_mkdir],
    [_AS_PATH_WALK([$PATH$PATH_SEPARATOR/opt/sfw/bin],
      [for ac_prog in mkdir gmkdir; do
	 for ac_exec_ext in '' $ac_executable_extensions; do
	   AS_EXECUTABLE_P(["$as_dir/$ac_prog$ac_exec_ext"]) || continue
	   case `"$as_dir/$ac_prog$ac_exec_ext" --version 2>&1` in #(
	     'mkdir (GNU coreutils) '* | \
	     'mkdir (coreutils) '* | \
	     'mkdir (fileutils) '4.1*)
	       ac_cv_path_mkdir=$as_dir/$ac_prog$ac_exec_ext
	       break 3;;
	   esac
	 done
       done])])
  if test "${ac_cv_path_mkdir+set}" = set; then
    MKDIR_P="$ac_cv_path_mkdir -p"
  else
    # As a last resort, use the slow shell script.  Don't cache a
    # value for MKDIR_P within a source directory, because that will
    # break other packages using the cache if that directory is
    # removed, or if the value is a relative name.
    test -d ./--version && rmdir ./--version
    MKDIR_P="$ac_install_sh -d"
  fi
fi
dnl Do special magic for MKDIR_P instead of AC_SUBST, to get
dnl relative names right.
AC_MSG_RESULT([$MKDIR_P])
])# AC_PROG_MKDIR_P


# AC_PROG_LEX
# -----------
# Look for flex or lex.  Set its associated library to LEXLIB.
# Check if lex declares yytext as a char * by default, not a char[].
AN_MAKEVAR([LEX],  [AC_PROG_LEX])
AN_PROGRAM([lex],  [AC_PROG_LEX])
AN_PROGRAM([flex], [AC_PROG_LEX])
AC_DEFUN_ONCE([AC_PROG_LEX],
[AC_CHECK_PROGS(LEX, flex lex, :)
if test -z "$LEXLIB"
then
  AC_CHECK_LIB(fl, yywrap, LEXLIB="-lfl",
    [AC_CHECK_LIB(l, yywrap, LEXLIB="-ll")])
fi
AC_SUBST(LEXLIB)
if test "x$LEX" != "x:"; then
  _AC_PROG_LEX_YYTEXT_DECL
fi])


# _AC_PROG_LEX_YYTEXT_DECL
# ------------------------
# Check if lex declares yytext as a char * by default, not a char[].
m4_define([_AC_PROG_LEX_YYTEXT_DECL],
[AC_CACHE_CHECK(lex output file root, ac_cv_prog_lex_root,
[# The minimal lex program is just a single line: %%.  But some broken lexes
# (Solaris, I think it was) want two %% lines, so accommodate them.
cat >conftest.l <<_ACEOF
%%
%%
_ACEOF
_AC_DO_VAR(LEX conftest.l)
if test -f lex.yy.c; then
  ac_cv_prog_lex_root=lex.yy
elif test -f lexyy.c; then
  ac_cv_prog_lex_root=lexyy
else
  AC_MSG_ERROR([cannot find output from $LEX; giving up])
fi])
rm -f conftest.l
AC_SUBST([LEX_OUTPUT_ROOT], [$ac_cv_prog_lex_root])dnl

AC_CACHE_CHECK(whether yytext is a pointer, ac_cv_prog_lex_yytext_pointer,
[# POSIX says lex can declare yytext either as a pointer or an array; the
# default is implementation-dependent. Figure out which it is, since
# not all implementations provide the %pointer and %array declarations.
ac_cv_prog_lex_yytext_pointer=no
echo 'extern char *yytext;' >>$LEX_OUTPUT_ROOT.c
ac_save_LIBS=$LIBS
LIBS="$LIBS $LEXLIB"
AC_LINK_IFELSE([`cat $LEX_OUTPUT_ROOT.c`], ac_cv_prog_lex_yytext_pointer=yes)
LIBS=$ac_save_LIBS
rm -f "${LEX_OUTPUT_ROOT}.c"
])
dnl
if test $ac_cv_prog_lex_yytext_pointer = yes; then
  AC_DEFINE(YYTEXT_POINTER, 1,
	    [Define to 1 if `lex' declares `yytext' as a `char *' by default,
	     not a `char[]'.])
fi
])# _AC_PROG_LEX_YYTEXT_DECL


# Require AC_PROG_LEX in case some people were just calling this macro.
AU_DEFUN([AC_DECL_YYTEXT],  [AC_PROG_LEX])


# AC_PROG_LN_S
# ------------
AN_MAKEVAR([LN], [AC_PROG_LN_S])
AN_PROGRAM([ln], [AC_PROG_LN_S])
AC_DEFUN([AC_PROG_LN_S],
[AC_MSG_CHECKING([whether ln -s works])
AC_SUBST([LN_S], [$as_ln_s])dnl
if test "$LN_S" = "ln -s"; then
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no, using $LN_S])
fi
])# AC_PROG_LN_S


# AC_PROG_MAKE_SET
# ----------------
# Define SET_MAKE to set ${MAKE} if Make does not do so automatically.  If Make
# does not run the test Makefile, we assume that the Make program the user will
# invoke does set $(MAKE).  This is typical, and emitting `MAKE=foomake' is
# always wrong if `foomake' is not available or does not work.
AN_MAKEVAR([MAKE], [AC_PROG_MAKE_SET])
AN_PROGRAM([make], [AC_PROG_MAKE_SET])
AC_DEFUN([AC_PROG_MAKE_SET],
[AC_MSG_CHECKING([whether ${MAKE-make} sets \$(MAKE)])
set x ${MAKE-make}; ac_make=`echo "$[2]" | sed 's/+/p/g; s/[[^a-zA-Z0-9_]]/_/g'`
AC_CACHE_VAL(ac_cv_prog_make_${ac_make}_set,
[cat >conftest.make <<\_ACEOF
SHELL = /bin/sh
all:
	@echo '@@@%%%=$(MAKE)=@@@%%%'
_ACEOF
# GNU make sometimes prints "make[1]: Entering...", which would confuse us.
case `${MAKE-make} -f conftest.make 2>/dev/null` in
  *@@@%%%=?*=@@@%%%*)
    eval ac_cv_prog_make_${ac_make}_set=yes;;
  *)
    eval ac_cv_prog_make_${ac_make}_set=no;;
esac
rm -f conftest.make])dnl
if eval test \$ac_cv_prog_make_${ac_make}_set = yes; then
  AC_MSG_RESULT([yes])
  SET_MAKE=
else
  AC_MSG_RESULT([no])
  SET_MAKE="MAKE=${MAKE-make}"
fi
AC_SUBST([SET_MAKE])dnl
])# AC_PROG_MAKE_SET


# AC_PROG_RANLIB
# --------------
AN_MAKEVAR([RANLIB], [AC_PROG_RANLIB])
AN_PROGRAM([ranlib], [AC_PROG_RANLIB])
AC_DEFUN([AC_PROG_RANLIB],
[AC_CHECK_TOOL(RANLIB, ranlib, :)])


# AC_RSH
# ------
# I don't know what it used to do, but it no longer does.
AU_DEFUN([AC_RSH], [],
[$0 is no longer supported.  Remove this warning when you
adjust the code.])


# AC_PROG_SED
# -----------
# Check for a fully functional sed program that truncates
# as few characters as possible.  Prefer GNU sed if found.
AC_DEFUN([AC_PROG_SED],
[AC_CACHE_CHECK([for a sed that does not truncate output], ac_cv_path_SED,
    [dnl ac_script should not contain more than 99 commands (for HP-UX sed),
     dnl but more than about 7000 bytes, to catch a limit in Solaris 8 /usr/ucb/sed.
     ac_script=s/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb/
     for ac_i in 1 2 3 4 5 6 7; do
       ac_script="$ac_script$as_nl$ac_script"
     done
     echo "$ac_script" | sed 99q >conftest.sed
     $as_unset ac_script || ac_script=
     _AC_PATH_PROG_FEATURE_CHECK(SED, [sed gsed],
	[_AC_FEATURE_CHECK_LENGTH([ac_path_SED], [ac_cv_path_SED],
		["$ac_path_SED" -f conftest.sed])])])
 SED="$ac_cv_path_SED"
 AC_SUBST([SED])dnl
 rm -f conftest.sed
])# AC_PROG_SED


# AC_PROG_YACC
# ------------
AN_MAKEVAR([BISON],  [AC_PROG_YACC])
AN_MAKEVAR([YACC],  [AC_PROG_YACC])
AN_MAKEVAR([YFLAGS],  [AC_PROG_YACC])
AN_PROGRAM([yacc],  [AC_PROG_YACC])
AN_PROGRAM([byacc], [AC_PROG_YACC])
AN_PROGRAM([bison], [AC_PROG_YACC])
AC_DEFUN([AC_PROG_YACC],
[AC_CHECK_PROGS(YACC, 'bison -y' byacc, yacc)dnl
AC_ARG_VAR(YACC,
[The `Yet Another C Compiler' implementation to use.  Defaults to the first
program found out of: `bison -y', `byacc', `yacc'.])dnl
AC_ARG_VAR(YFLAGS,
[The list of arguments that will be passed by default to $YACC.  This script
will default YFLAGS to the empty string to avoid a default value of `-d' given
by some make applications.])])