acgeneral.m4

这是一个自动生成MAKEFILE的工具。在LINUX工程项目里是很好的帮手。希望对大家有点帮助。

dnl ### Compiler-running mechanics


dnl The purpose of this macro is to "configure:123: command line"
dnl written into config.log for every test run.
dnl AC_TRY_EVAL(VARIABLE)
AC_DEFUN(AC_TRY_EVAL,
[{ (eval echo configure:__oline__: \"[$]$1\") 1>&AC_FD_CC; dnl
(eval [$]$1) 2>&AC_FD_CC; }])

dnl AC_TRY_COMMAND(COMMAND)
AC_DEFUN(AC_TRY_COMMAND,
[{ ac_try='$1'; AC_TRY_EVAL(ac_try); }])


dnl ### Dependencies between macros


dnl AC_BEFORE(THIS-MACRO-NAME, CALLED-MACRO-NAME)
define(AC_BEFORE,
[ifdef([AC_PROVIDE_$2], [errprint(__file__:__line__: [$2 was called before $1
])])])

dnl AC_REQUIRE(MACRO-NAME)
define(AC_REQUIRE,
[ifdef([AC_PROVIDE_$1], ,
[AC_DIVERT_PUSH(builtin(eval, AC_DIVERSION_CURRENT - 1))dnl
indir([$1])
AC_DIVERT_POP()dnl
])])

dnl AC_PROVIDE(MACRO-NAME)
define(AC_PROVIDE,
[define([AC_PROVIDE_$1], )])

dnl AC_OBSOLETE(THIS-MACRO-NAME [, SUGGESTION])
define(AC_OBSOLETE,
[errprint(__file__:__line__: warning: [$1] is obsolete[$2]
)])


dnl ### Checking for programs


dnl AC_CHECK_PROG(VARIABLE, PROG-TO-CHECK-FOR, VALUE-IF-FOUND
dnl               [, [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_$1="[$]$1" # Let the user override the test.
else
  IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS=":"
ifelse([$6], , , [  ac_prog_rejected=no
])dnl
dnl $ac_dummy forces splitting on constant user-supplied paths.
dnl POSIX.2 word splitting is done only on the output of word expansions,
dnl not every word.  This closes a longstanding sh security hole.
  ac_dummy="ifelse([$5], , $PATH, [$5])"
  for ac_dir in $ac_dummy; do
    test -z "$ac_dir" && ac_dir=.
    if test -f $ac_dir/$ac_word; then
ifelse([$6], , , dnl
[      if test "[$ac_dir/$ac_word]" = "$6"; then
        ac_prog_rejected=yes
	continue
      fi
])dnl
      ac_cv_prog_$1="$3"
      break
    fi
  done
  IFS="$ac_save_ifs"
ifelse([$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_$1
  shift
  if test [$]# -gt 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 $1 to just the basename; use the full file name.
    shift
    set dummy "$ac_dir/$ac_word" "[$]@"
    shift
    ac_cv_prog_$1="[$]@"
ifelse([$2], [$4], dnl
[  else
    # Default is a loser.
    AC_MSG_ERROR([$1=$6 unacceptable, but no other $4 found in dnl
ifelse([$5], , [\$]PATH, [$5])])
])dnl
  fi
fi
])dnl
dnl If no 4th arg is given, leave the cache variable unset,
dnl so AC_CHECK_PROGS will keep looking.
ifelse([$4], , , [  test -z "[$]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
])

dnl 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.
  ;;
  ?:/*)			 
  ac_cv_path_$1="[$]$1" # Let the user override the test with a dos path.
  ;;
  *)
  IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS=":"
dnl $ac_dummy forces splitting on constant user-supplied paths.
dnl POSIX.2 word splitting is done only on the output of word expansions,
dnl not every word.  This closes a longstanding sh security hole.
  ac_dummy="ifelse([$4], , $PATH, [$4])"
  for ac_dir in $ac_dummy; do 
    test -z "$ac_dir" && ac_dir=.
    if test -f $ac_dir/$ac_word; then
      ac_cv_path_$1="$ac_dir/$ac_word"
      break
    fi
  done
  IFS="$ac_save_ifs"
dnl If no 3rd arg is given, leave the cache variable unset,
dnl so AC_PATH_PROGS will keep looking.
ifelse([$3], , , [  test -z "[$]ac_cv_path_$1" && ac_cv_path_$1="$3"
])dnl
  ;;
esac])dnl
$1="$ac_cv_path_$1"
if test -n "[$]$1"; then
  AC_MSG_RESULT([$]$1)
else
  AC_MSG_RESULT(no)
fi
AC_SUBST($1)dnl
])

dnl AC_CHECK_PROGS(VARIABLE, PROGS-TO-CHECK-FOR [, VALUE-IF-NOT-FOUND
dnl                [, 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
ifelse([$3], , , [test -n "[$]$1" || $1="$3"
])])

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

dnl Internal subroutine.
AC_DEFUN(AC_CHECK_TOOL_PREFIX,
[AC_REQUIRE([AC_CANONICAL_HOST])AC_REQUIRE([AC_CANONICAL_BUILD])dnl
if test $host != $build; then
  ac_tool_prefix=${host_alias}-
else
  ac_tool_prefix=
fi
])

dnl AC_CHECK_TOOL(VARIABLE, PROG-TO-CHECK-FOR[, VALUE-IF-NOT-FOUND [, PATH]])
AC_DEFUN(AC_CHECK_TOOL,
[AC_REQUIRE([AC_CHECK_TOOL_PREFIX])dnl
AC_CHECK_PROG($1, ${ac_tool_prefix}$2, ${ac_tool_prefix}$2,
	      ifelse([$3], , [$2], ), $4)
ifelse([$3], , , [
if test -z "$ac_cv_prog_$1"; then
if test -n "$ac_tool_prefix"; then
  AC_CHECK_PROG($1, $2, $2, $3)
else
  $1="$3"
fi
fi])
])

dnl Guess the value for the `prefix' variable by looking for
dnl the argument program along PATH and taking its parent.
dnl Example: if the argument is `gcc' and we find /usr/local/gnu/bin/gcc,
dnl set `prefix' to /usr/local/gnu.
dnl This comes too late to find a site file based on the prefix,
dnl and it might use a cached value for the path.
dnl No big loss, I think, since most configures don't use this macro anyway.
dnl AC_PREFIX_PROGRAM(PROGRAM)
AC_DEFUN(AC_PREFIX_PROGRAM,
[if test "x$prefix" = xNONE; then
changequote(<<, >>)dnl
define(<<AC_VAR_NAME>>, translit($1, [a-z], [A-Z]))dnl
changequote([, ])dnl
dnl We reimplement AC_MSG_CHECKING (mostly) to avoid the ... in the middle.
echo $ac_n "checking for prefix by $ac_c" 1>&AC_FD_MSG
AC_PATH_PROG(AC_VAR_NAME, $1)
changequote(<<, >>)dnl
  if test -n "$ac_cv_path_<<>>AC_VAR_NAME"; then
    prefix=`echo $ac_cv_path_<<>>AC_VAR_NAME|sed 's%/[^/][^/]*//*[^/][^/]*$%%'`
changequote([, ])dnl
  fi
fi
undefine([AC_VAR_NAME])dnl
])

dnl Try to compile, link and execute TEST-PROGRAM.  Set WORKING-VAR to
dnl `yes' if the current compiler works, otherwise set it ti `no'.  Set
dnl CROSS-VAR to `yes' if the compiler and linker produce non-native
dnl executables, otherwise set it to `no'.  Before calling
dnl `AC_TRY_COMPILER()', call `AC_LANG_*' to set-up for the right
dnl language.
dnl 
dnl AC_TRY_COMPILER(TEST-PROGRAM, WORKING-VAR, CROSS-VAR)
AC_DEFUN(AC_TRY_COMPILER,
[cat > conftest.$ac_ext << EOF
ifelse(AC_LANG, [FORTRAN77], ,
[
[#]line __oline__ "configure"
#include "confdefs.h"
])
[$1]
EOF
if AC_TRY_EVAL(ac_link) && test -s conftest${ac_exeext}; then
  [$2]=yes
  # If we can't run a trivial program, we are probably using a cross compiler.
  if (./conftest; exit) 2>/dev/null; then
    [$3]=no
  else
    [$3]=yes
  fi
else
  echo "configure: failed program was:" >&AC_FD_CC
  cat conftest.$ac_ext >&AC_FD_CC
  [$2]=no
fi
rm -fr conftest*])


dnl ### Checking for libraries


dnl AC_TRY_LINK_FUNC(func, action-if-found, action-if-not-found)
dnl Try to link a program that calls FUNC, handling GCC builtins.  If
dnl the link succeeds, execute ACTION-IF-FOUND; otherwise, execute
dnl ACTION-IF-NOT-FOUND.

AC_DEFUN(AC_TRY_LINK_FUNC,
AC_TRY_LINK(dnl
ifelse([$1], [main], , dnl Avoid conflicting decl of main.
[/* Override any gcc2 internal prototype to avoid an error.  */
]ifelse(AC_LANG, CPLUSPLUS, [#ifdef __cplusplus
extern "C"
#endif
])dnl
[/* We use char because int might match the return type of a gcc2
    builtin and then its argument prototype would still apply.  */
char $1();
]),
[$1()],
[$2],
[$3]))


dnl AC_SEARCH_LIBS(FUNCTION, SEARCH-LIBS [, ACTION-IF-FOUND
dnl            [, ACTION-IF-NOT-FOUND [, OTHER-LIBRARIES]]])
dnl Search for a library defining FUNC, if it's not already available.

AC_DEFUN(AC_SEARCH_LIBS,
[AC_PREREQ([2.13])
AC_CACHE_CHECK([for library containing $1], [ac_cv_search_$1],
[ac_func_search_save_LIBS="$LIBS"
ac_cv_search_$1="no"
AC_TRY_LINK_FUNC([$1], [ac_cv_search_$1="none required"])
test "$ac_cv_search_$1" = "no" && for i in $2; do
LIBS="-l$i $5 $ac_func_search_save_LIBS"
AC_TRY_LINK_FUNC([$1],
[ac_cv_search_$1="-l$i"
break])
done
LIBS="$ac_func_search_save_LIBS"])
if test "$ac_cv_search_$1" != "no"; then
  test "$ac_cv_search_$1" = "none required" || LIBS="$ac_cv_search_$1 $LIBS"
  $3
else :
  $4
fi])



dnl AC_CHECK_LIB(LIBRARY, FUNCTION [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND
dnl              [, OTHER-LIBRARIES]]])
AC_DEFUN(AC_CHECK_LIB,
[AC_MSG_CHECKING([for $2 in -l$1])
dnl Use a cache variable name containing both the library and function name,
dnl because the test really is for library $1 defining function $2, not
dnl just for library $1.  Separate tests with the same $1 and different $2s
dnl may have different results.
ac_lib_var=`echo $1['_']$2 | sed 'y%./+-%__p_%'`
AC_CACHE_VAL(ac_cv_lib_$ac_lib_var,
[ac_save_LIBS="$LIBS"
LIBS="-l$1 $5 $LIBS"
AC_TRY_LINK(dnl
ifelse(AC_LANG, [FORTRAN77], ,
ifelse([$2], [main], , dnl Avoid conflicting decl of main.
[/* Override any gcc2 internal prototype to avoid an error.  */
]ifelse(AC_LANG, CPLUSPLUS, [#ifdef __cplusplus
extern "C"
#endif
])dnl
[/* We use char because int might match the return type of a gcc2
    builtin and then its argument prototype would still apply.  */
char $2();
])),
	    [$2()],
	    eval "ac_cv_lib_$ac_lib_var=yes",
	    eval "ac_cv_lib_$ac_lib_var=no")
LIBS="$ac_save_LIBS"
])dnl
if eval "test \"`echo '$ac_cv_lib_'$ac_lib_var`\" = yes"; then
  AC_MSG_RESULT(yes)
  ifelse([$3], ,
[changequote(, )dnl
  ac_tr_lib=HAVE_LIB`echo $1 | sed -e 's/[^a-zA-Z0-9_]/_/g' \
    -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'`
changequote([, ])dnl
  AC_DEFINE_UNQUOTED($ac_tr_lib)
  LIBS="-l$1 $LIBS"
], [$3])
else
  AC_MSG_RESULT(no)
ifelse([$4], , , [$4
])dnl
fi
])

dnl AC_HAVE_LIBRARY(LIBRARY, [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND
dnl                 [, OTHER-LIBRARIES]]])
AC_DEFUN(AC_HAVE_LIBRARY,
[AC_OBSOLETE([$0], [; instead use AC_CHECK_LIB])dnl
changequote(<<, >>)dnl
define(<<AC_LIB_NAME>>, dnl
patsubst(patsubst($1, <<lib\([^\.]*\)\.a>>, <<\1>>), <<-l>>, <<>>))dnl
define(<<AC_CV_NAME>>, ac_cv_lib_<<>>AC_LIB_NAME)dnl
changequote([, ])dnl
AC_MSG_CHECKING([for -l[]AC_LIB_NAME])
AC_CACHE_VAL(AC_CV_NAME,
[ac_save_LIBS="$LIBS"
LIBS="-l[]AC_LIB_NAME[] $4 $LIBS"
AC_TRY_LINK( , [main()], AC_CV_NAME=yes, AC_CV_NAME=no)
LIBS="$ac_save_LIBS"
])dnl
AC_MSG_RESULT($AC_CV_NAME)
if test "$AC_CV_NAME" = yes; then
  ifelse([$2], ,
[AC_DEFINE([HAVE_LIB]translit(AC_LIB_NAME, [a-z], [A-Z]))
  LIBS="-l[]AC_LIB_NAME[] $LIBS"
], [$2])
ifelse([$3], , , [else
  $3
])dnl
fi
undefine([AC_LIB_NAME])dnl
undefine([AC_CV_NAME])dnl
])


dnl ### Examining declarations


dnl AC_TRY_CPP(INCLUDES, [ACTION-IF-TRUE [, ACTION-IF-FALSE]])
AC_DEFUN(AC_TRY_CPP,
[AC_REQUIRE_CPP()dnl
cat > conftest.$ac_ext <<EOF
[#]line __oline__ "configure"
#include "confdefs.h"
[$1]
EOF
dnl Capture the stderr of cpp.  eval is necessary to expand ac_cpp.
dnl We used to copy stderr to stdout and capture it in a variable, but
dnl that breaks under sh -x, which writes compile commands starting
dnl with ` +' to stderr in eval and subshells.
ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
AC_TRY_EVAL(ac_try)
ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
if test -z "$ac_err"; then
  ifelse([$2], , :, [rm -rf conftest*
  $2])
else
  echo "$ac_err" >&AC_FD_CC
  echo "configure: failed program was:" >&AC_FD_CC
  cat conftest.$ac_ext >&AC_FD_CC
ifelse([$3], , , [  rm -rf conftest*
  $3
])dnl
fi
rm -f conftest*])

dnl AC_EGREP_HEADER(PATTERN, HEADER-FILE, ACTION-IF-FOUND [,
dnl                 ACTION-IF-NOT-FOUND])
AC_DEFUN(AC_EGREP_HEADER,
[AC_EGREP_CPP([$1], [#include <$2>], [$3], [$4])])

dnl Because this macro is used by AC_PROG_GCC_TRADITIONAL, which must
dnl come early, it is not included in AC_BEFORE checks.