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dnl Copyright (C) 2005, 2006, 2007, 2008 Free Software Foundation, Inc.

dnl

dnl This file is part of GCC.

dnl

dnl GCC is free software; you can redistribute it and/or modify

dnl it under the terms of the GNU General Public License as published by

dnl the Free Software Foundation; either version 3, or (at your option)

dnl any later version.

dnl

dnl GCC is distributed in the hope that it will be useful,

dnl but WITHOUT ANY WARRANTY; without even the implied warranty of

dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

dnl GNU General Public License for more details.

dnl

dnl You should have received a copy of the GNU General Public License

dnl along with GCC; see the file COPYING3.  If not see

dnl <http://www.gnu.org/licenses/>.

dnl See whether we need a declaration for a function.

dnl The result is highly dependent on the INCLUDES passed in, so make sure

dnl to use a different cache variable name in this macro if it is invoked

dnl in a different context somewhere else.

dnl gcc_AC_CHECK_DECL(SYMBOL,

dnl     [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND [, INCLUDES]]])

AC_DEFUN([gcc_AC_CHECK_DECL],

[AC_MSG_CHECKING([whether $1 is declared])

AC_CACHE_VAL(gcc_cv_have_decl_$1,

[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$4],

[#ifndef $1

char *(*pfn) = (char *(*)) $1 ;

#endif])], eval "gcc_cv_have_decl_$1=yes", eval "gcc_cv_have_decl_$1=no")])

if eval "test \"`echo '$gcc_cv_have_decl_'$1`\" = yes"; then

  AC_MSG_RESULT(yes) ; ifelse([$2], , :, [$2])

else

  AC_MSG_RESULT(no) ; ifelse([$3], , :, [$3])

fi

])dnl

dnl Check multiple functions to see whether each needs a declaration.

dnl Arrange to define HAVE_DECL_<FUNCTION> to 0 or 1 as appropriate.

dnl gcc_AC_CHECK_DECLS(SYMBOLS,

dnl     [ACTION-IF-NEEDED [, ACTION-IF-NOT-NEEDED [, INCLUDES]]])

AC_DEFUN([gcc_AC_CHECK_DECLS],

[AC_FOREACH([gcc_AC_Func], [$1],

  [AH_TEMPLATE(AS_TR_CPP(HAVE_DECL_[]gcc_AC_Func),

  [Define to 1 if we found a declaration for ']gcc_AC_Func[', otherwise

   define to 0.])])dnl

for ac_func in $1

do

  ac_tr_decl=AS_TR_CPP([HAVE_DECL_$ac_func])

gcc_AC_CHECK_DECL($ac_func,

  [AC_DEFINE_UNQUOTED($ac_tr_decl, 1) $2],

  [AC_DEFINE_UNQUOTED($ac_tr_decl, 0) $3],

dnl It is possible that the include files passed in here are local headers

dnl which supply a backup declaration for the relevant prototype based on

dnl the definition of (or lack of) the HAVE_DECL_ macro.  If so, this test

dnl will always return success.  E.g. see libiberty.h's handling of

dnl `basename'.  To avoid this, we define the relevant HAVE_DECL_ macro to

dnl 1 so that any local headers used do not provide their own prototype

dnl during this test.

#undef $ac_tr_decl

#define $ac_tr_decl 1

  $4

)

done

])

dnl 'make compare' can be significantly faster, if cmp itself can

dnl skip bytes instead of using tail.  The test being performed is

dnl "if cmp --ignore-initial=2 t1 t2 && ! cmp --ignore-initial=1 t1 t2"

dnl but we need to sink errors and handle broken shells.  We also test

dnl for the parameter format "cmp file1 file2 skip1 skip2" which is

dnl accepted by cmp on some systems.

AC_DEFUN([gcc_AC_PROG_CMP_IGNORE_INITIAL],

[AC_CACHE_CHECK([for cmp's capabilities], gcc_cv_prog_cmp_skip,

[ echo abfoo >t1

  echo cdfoo >t2

  gcc_cv_prog_cmp_skip=slowcompare

  if cmp --ignore-initial=2 t1 t2 > /dev/null 2>&1; then

    if cmp --ignore-initial=1 t1 t2 > /dev/null 2>&1; then

      :

    else

      gcc_cv_prog_cmp_skip=gnucompare

    fi

  fi

  if test $gcc_cv_prog_cmp_skip = slowcompare ; then

    if cmp t1 t2 2 2 > /dev/null 2>&1; then

      if cmp t1 t2 1 1 > /dev/null 2>&1; then

        :

      else

        gcc_cv_prog_cmp_skip=fastcompare

      fi

    fi

  fi

  rm t1 t2

])

make_compare_target=$gcc_cv_prog_cmp_skip

AC_SUBST(make_compare_target)

])

dnl See if symbolic links work and if not, try to substitute either hard links or simple copy.

AC_DEFUN([gcc_AC_PROG_LN_S],

[AC_MSG_CHECKING(whether ln -s works)

AC_CACHE_VAL(gcc_cv_prog_LN_S,

[rm -f conftestdata_t

echo >conftestdata_f

if ln -s conftestdata_f conftestdata_t 2>/dev/null

then

  gcc_cv_prog_LN_S="ln -s"

else

  if ln conftestdata_f conftestdata_t 2>/dev/null

  then

    gcc_cv_prog_LN_S=ln

  else

    if cp -p conftestdata_f conftestdata_t 2>/dev/null

    then

      gcc_cv_prog_LN_S="cp -p"

    else

      gcc_cv_prog_LN_S=cp

    fi

  fi

fi

rm -f conftestdata_f conftestdata_t

])dnl

LN_S="$gcc_cv_prog_LN_S"

if test "$gcc_cv_prog_LN_S" = "ln -s"; then

  AC_MSG_RESULT(yes)

else

  if test "$gcc_cv_prog_LN_S" = "ln"; then

    AC_MSG_RESULT([no, using ln])

  else

    AC_MSG_RESULT([no, and neither does ln, so using $gcc_cv_prog_LN_S])

  fi

fi

AC_SUBST(LN_S)dnl

])

dnl Define MKDIR_TAKES_ONE_ARG if mkdir accepts only one argument instead

dnl of the usual 2.

AC_DEFUN([gcc_AC_FUNC_MKDIR_TAKES_ONE_ARG],

[AC_CACHE_CHECK([if mkdir takes one argument], gcc_cv_mkdir_takes_one_arg,

[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([

#include <sys/types.h>

#ifdef HAVE_SYS_STAT_H

# include <sys/stat.h>

#endif

#ifdef HAVE_UNISTD_H

# include <unistd.h>

#endif

#ifdef HAVE_DIRECT_H

# include <direct.h>

#endif], [mkdir ("foo", 0);])],

        gcc_cv_mkdir_takes_one_arg=no, gcc_cv_mkdir_takes_one_arg=yes)])

if test $gcc_cv_mkdir_takes_one_arg = yes ; then

  AC_DEFINE(MKDIR_TAKES_ONE_ARG, 1, [Define if host mkdir takes a single argument.])

fi

])

AC_DEFUN([gcc_AC_PROG_INSTALL],

[AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])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

# AFS /usr/afsws/bin/install, which mishandles nonexistent args

# SVR4 /usr/ucb/install, which tries to use the nonexistent group "staff"

# ./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,

[  IFS="${IFS=  }"; ac_save_IFS="$IFS"; IFS="${IFS}:"

  for ac_dir in $PATH; do

    # Account for people who put trailing slashes in PATH elements.

    case "$ac_dir/" in

    /|./|.//|/etc/*|/usr/sbin/*|/usr/etc/*|/sbin/*|/usr/afsws/bin/*|/usr/ucb/*) ;;

    *)

      # OSF1 and SCO ODT 3.0 have their own names for install.

      for ac_prog in ginstall scoinst install; do

        if test -f $ac_dir/$ac_prog; then

          if test $ac_prog = install &&

            grep dspmsg $ac_dir/$ac_prog >/dev/null 2>&1; then

            # AIX install.  It has an incompatible calling convention.

            # OSF/1 installbsd also uses dspmsg, but is usable.

            :

          else

            ac_cv_path_install="$ac_dir/$ac_prog -c"

            break 2

          fi

        fi

      done

      ;;

    esac

  done

  IFS="$ac_save_IFS"

])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.  We don't cache a

    # path for INSTALL within a source directory, because that will

    # break other packages using the cache if that directory is

    # removed, or if the path is relative.

    INSTALL="$ac_install_sh"

  fi

fi

dnl We do special magic for INSTALL instead of AC_SUBST, to get

dnl relative paths right.

AC_MSG_RESULT($INSTALL)

AC_SUBST(INSTALL)dnl

# 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 "$INSTALL_DATA" && INSTALL_DATA='${INSTALL} -m 644'

AC_SUBST(INSTALL_DATA)dnl

])

# mmap(2) blacklisting.  Some platforms provide the mmap library routine

# but don't support all of the features we need from it.

AC_DEFUN([gcc_AC_FUNC_MMAP_BLACKLIST],

[

AC_CHECK_HEADER([sys/mman.h],

                [gcc_header_sys_mman_h=yes], [gcc_header_sys_mman_h=no])

AC_CHECK_FUNC([mmap], [gcc_func_mmap=yes], [gcc_func_mmap=no])

if test "$gcc_header_sys_mman_h" != yes \

 || test "$gcc_func_mmap" != yes; then

   gcc_cv_func_mmap_file=no

   gcc_cv_func_mmap_dev_zero=no

   gcc_cv_func_mmap_anon=no

else

   AC_CACHE_CHECK([whether read-only mmap of a plain file works],

  gcc_cv_func_mmap_file,

  [# Add a system to this blacklist if

   # mmap(0, stat_size, PROT_READ, MAP_PRIVATE, fd, 0) doesn't return a

   # memory area containing the same data that you'd get if you applied

   # read() to the same fd.  The only system known to have a problem here

   # is VMS, where text files have record structure.

   case "$host_os" in

     vms* | ultrix*)

        gcc_cv_func_mmap_file=no ;;

     *)

        gcc_cv_func_mmap_file=yes;;

   esac])

   AC_CACHE_CHECK([whether mmap from /dev/zero works],

  gcc_cv_func_mmap_dev_zero,

  [# Add a system to this blacklist if it has mmap() but /dev/zero

   # does not exist, or if mmapping /dev/zero does not give anonymous

   # zeroed pages with both the following properties:

   # 1. If you map N consecutive pages in with one call, and then

   #    unmap any subset of those pages, the pages that were not

   #    explicitly unmapped remain accessible.

   # 2. If you map two adjacent blocks of memory and then unmap them

   #    both at once, they must both go away.

   # Systems known to be in this category are Windows (all variants),

   # VMS, and Darwin.

   case "$host_os" in

     vms* | cygwin* | pe | mingw* | darwin* | ultrix* | hpux10* | hpux11.00)

        gcc_cv_func_mmap_dev_zero=no ;;

     *)

        gcc_cv_func_mmap_dev_zero=yes;;

   esac])

   # Unlike /dev/zero, the MAP_ANON(YMOUS) defines can be probed for.

   AC_CACHE_CHECK([for MAP_ANON(YMOUS)], gcc_cv_decl_map_anon,

    [AC_COMPILE_IFELSE([AC_LANG_PROGRAM(

[#include <sys/types.h>

#include <sys/mman.h>

#include <unistd.h>

#ifndef MAP_ANONYMOUS

#define MAP_ANONYMOUS MAP_ANON

#endif

],

[int n = MAP_ANONYMOUS;])],

    gcc_cv_decl_map_anon=yes,

    gcc_cv_decl_map_anon=no)])

   if test $gcc_cv_decl_map_anon = no; then

     gcc_cv_func_mmap_anon=no

   else

     AC_CACHE_CHECK([whether mmap with MAP_ANON(YMOUS) works],

     gcc_cv_func_mmap_anon,

  [# Add a system to this blacklist if it has mmap() and MAP_ANON or

   # MAP_ANONYMOUS, but using mmap(..., MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)

   # doesn't give anonymous zeroed pages with the same properties listed

   # above for use of /dev/zero.

   # Systems known to be in this category are Windows, VMS, and SCO Unix.

   case "$host_os" in

     vms* | cygwin* | pe | mingw* | sco* | udk* )

        gcc_cv_func_mmap_anon=no ;;

     *)

        gcc_cv_func_mmap_anon=yes;;

   esac])

   fi

fi

if test $gcc_cv_func_mmap_file = yes; then

  AC_DEFINE(HAVE_MMAP_FILE, 1,

            [Define if read-only mmap of a plain file works.])

fi

if test $gcc_cv_func_mmap_dev_zero = yes; then

  AC_DEFINE(HAVE_MMAP_DEV_ZERO, 1,

            [Define if mmap of /dev/zero works.])

fi

if test $gcc_cv_func_mmap_anon = yes; then

  AC_DEFINE(HAVE_MMAP_ANON, 1,

            [Define if mmap with MAP_ANON(YMOUS) works.])

fi

])

dnl Determine if enumerated bitfields are unsigned.   ISO C says they can

dnl be either signed or unsigned.

dnl

AC_DEFUN([gcc_AC_C_ENUM_BF_UNSIGNED],

[AC_CACHE_CHECK(for unsigned enumerated bitfields, gcc_cv_enum_bf_unsigned,

[AC_RUN_IFELSE([AC_LANG_SOURCE([#include <stdlib.h>

enum t { BLAH = 128 } ;

struct s_t { enum t member : 8; } s ;

int main(void)

{

        s.member = BLAH;

        if (s.member < 0) exit(1);

        exit(0);

}])], gcc_cv_enum_bf_unsigned=yes, gcc_cv_enum_bf_unsigned=no, gcc_cv_enum_bf_unsigned=yes)])

if test $gcc_cv_enum_bf_unsigned = yes; then

  AC_DEFINE(ENUM_BITFIELDS_ARE_UNSIGNED, 1,

    [Define if enumerated bitfields are treated as unsigned values.])

fi])

dnl Probe number of bits in a byte.

dnl Note C89 requires CHAR_BIT >= 8.

dnl

AC_DEFUN([gcc_AC_C_CHAR_BIT],

[AC_CACHE_CHECK(for CHAR_BIT, gcc_cv_decl_char_bit,

[AC_EGREP_CPP(found,

[#ifdef HAVE_LIMITS_H

#include <limits.h>

#endif

#ifdef CHAR_BIT

found

#endif], gcc_cv_decl_char_bit=yes, gcc_cv_decl_char_bit=no)

])

if test $gcc_cv_decl_char_bit = no; then

  AC_CACHE_CHECK(number of bits in a byte, gcc_cv_c_nbby,

[i=8

 gcc_cv_c_nbby=

 while test $i -lt 65; do

   AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,

     [switch(0) {

  case (unsigned char)((unsigned long)1 << $i) == ((unsigned long)1 << $i):

  case (unsigned char)((unsigned long)1<<($i-1)) == ((unsigned long)1<<($i-1)):

  ; }])],

     [gcc_cv_c_nbby=$i; break])

   i=`expr $i + 1`

 done

 test -z "$gcc_cv_c_nbby" && gcc_cv_c_nbby=failed

])

if test $gcc_cv_c_nbby = failed; then

  AC_MSG_ERROR(cannot determine number of bits in a byte)

else

  AC_DEFINE_UNQUOTED(CHAR_BIT, $gcc_cv_c_nbby,

  [Define as the number of bits in a byte, if `limits.h' doesn't.])

fi

fi])

AC_DEFUN([gcc_AC_INITFINI_ARRAY],

[AC_ARG_ENABLE(initfini-array,

        [  --enable-initfini-array      use .init_array/.fini_array sections],

        [], [

AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,

                 gcc_cv_initfini_array, [dnl

  AC_RUN_IFELSE([AC_LANG_SOURCE([

static int x = -1;

int main (void) { return x; }

int foo (void) { x = 0; }

int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;])],

             [gcc_cv_initfini_array=yes], [gcc_cv_initfini_array=no],

             [gcc_cv_initfini_array=no])])

  enable_initfini_array=$gcc_cv_initfini_array

])

if test $enable_initfini_array = yes; then

  AC_DEFINE(HAVE_INITFINI_ARRAY, 1,

    [Define .init_array/.fini_array sections are available and working.])

fi])

dnl # _gcc_COMPUTE_GAS_VERSION

dnl # Used by gcc_GAS_VERSION_GTE_IFELSE

dnl #

dnl # WARNING:

dnl # gcc_cv_as_gas_srcdir must be defined before this.

dnl # This gross requirement will go away eventually.

AC_DEFUN([_gcc_COMPUTE_GAS_VERSION],

[gcc_cv_as_bfd_srcdir=`echo $srcdir | sed -e 's,/gcc$,,'`/bfd

for f in $gcc_cv_as_bfd_srcdir/configure \

         $gcc_cv_as_gas_srcdir/configure \

         $gcc_cv_as_gas_srcdir/configure.in \

         $gcc_cv_as_gas_srcdir/Makefile.in ; do

  gcc_cv_gas_version=`sed -n -e 's/^[[  ]]*\(VERSION=[[0-9]]*\.[[0-9]]*.*\)/\1/p' < $f`

  if test x$gcc_cv_gas_version != x; then

    break

  fi

done

gcc_cv_gas_major_version=`expr "$gcc_cv_gas_version" : "VERSION=\([[0-9]]*\)"`

gcc_cv_gas_minor_version=`expr "$gcc_cv_gas_version" : "VERSION=[[0-9]]*\.\([[0-9]]*\)"`

gcc_cv_gas_patch_version=`expr "$gcc_cv_gas_version" : "VERSION=[[0-9]]*\.[[0-9]]*\.\([[0-9]]*\)"`

case $gcc_cv_gas_patch_version in

  "") gcc_cv_gas_patch_version="0" ;;

esac

gcc_cv_gas_vers=`expr \( \( $gcc_cv_gas_major_version \* 1000 \) \

                            + $gcc_cv_gas_minor_version \) \* 1000 \

                            + $gcc_cv_gas_patch_version`

]) []dnl # _gcc_COMPUTE_GAS_VERSION

dnl # gcc_GAS_VERSION_GTE_IFELSE([elf,] major, minor, patchlevel,

dnl #                     [command_if_true = :], [command_if_false = :])

dnl # Check to see if the version of GAS is greater than or

dnl # equal to the specified version.

dnl #

dnl # The first ifelse() shortens the shell code if the patchlevel

dnl # is unimportant (the usual case).  The others handle missing

dnl # commands.  Note that the tests are structured so that the most

dnl # common version number cases are tested first.

AC_DEFUN([_gcc_GAS_VERSION_GTE_IFELSE],

[ifelse([$1], elf,

 [if test $in_tree_gas_is_elf = yes \

  &&],

 [if]) test $gcc_cv_gas_vers -ge `expr \( \( $2 \* 1000 \) + $3 \) \* 1000 + $4`

  then dnl

ifelse([$5],,:,[$5])[]dnl

ifelse([$6],,,[

  else $6])

fi])

AC_DEFUN([gcc_GAS_VERSION_GTE_IFELSE],

[AC_REQUIRE([_gcc_COMPUTE_GAS_VERSION])dnl

ifelse([$1], elf, [_gcc_GAS_VERSION_GTE_IFELSE($@)],

                  [_gcc_GAS_VERSION_GTE_IFELSE(,$@)])])

dnl # gcc_GAS_FLAGS

dnl # Used by gcc_GAS_CHECK_FEATURE

dnl #

AC_DEFUN([gcc_GAS_FLAGS],

[AC_CACHE_CHECK([assembler flags], gcc_cv_as_flags,

[ case "$target" in

  i[[34567]]86-*-linux*)

    dnl Always pass --32 to ia32 Linux assembler.

    gcc_cv_as_flags="--32"

    ;;

  *)

    gcc_cv_as_flags=" "

    ;;

  esac])

])

dnl gcc_GAS_CHECK_FEATURE(description, cv, [[elf,]major,minor,patchlevel],

dnl [extra switches to as], [assembler input],

dnl [extra testing logic], [command if feature available])

dnl

dnl Checks for an assembler feature.  If we are building an in-tree

dnl gas, the feature is available if the associated assembler version

dnl is greater than or equal to major.minor.patchlevel.  If not, then

dnl ASSEMBLER INPUT is fed to the assembler and the feature is available

dnl if assembly succeeds.  If EXTRA TESTING LOGIC is not the empty string,

dnl then it is run instead of simply setting CV to "yes" - it is responsible

dnl for doing so, if appropriate.

AC_DEFUN([gcc_GAS_CHECK_FEATURE],

[AC_REQUIRE([gcc_GAS_FLAGS])dnl

AC_CACHE_CHECK([assembler for $1], [$2],

 [[$2]=no

  ifelse([$3],,,[dnl

  if test $in_tree_gas = yes; then

    gcc_GAS_VERSION_GTE_IFELSE($3, [[$2]=yes])

  el])if test x$gcc_cv_as != x; then

    echo ifelse(m4_substr([$5],0,1),[$], "[$5]", '[$5]') > conftest.s

    if AC_TRY_COMMAND([$gcc_cv_as $gcc_cv_as_flags $4 -o conftest.o conftest.s >&AS_MESSAGE_LOG_FD])

    then

        ifelse([$6],, [$2]=yes, [$6])

    else

      echo "configure: failed program was" >&AS_MESSAGE_LOG_FD

      cat conftest.s >&AS_MESSAGE_LOG_FD

    fi

    rm -f conftest.o conftest.s

  fi])

ifelse([$7],,,[dnl

if test $[$2] = yes; then

  $7

fi])])

dnl GCC_TARGET_TEMPLATE(KEY)

dnl ------------------------

dnl Define KEY as a valid configure key on the target machine.

m4_define([GCC_TARGET_TEMPLATE],

[m4_define([GCC_TARGET_TEMPLATE($1)],[])])

dnl AH_TEMPLATE(KEY, DESCRIPTION)

dnl -----------------------------

dnl Issue an autoheader template for KEY, i.e., a comment composed of

dnl DESCRIPTION (properly wrapped), and then #undef KEY.  Redefinition

dnl of the macro in autoheader.m4, to support definition of only a few

dnl keys while compiling target libraries.

m4_define([AH_TEMPLATE],

[AH_VERBATIM([$1],m4_text_wrap([$2 */], [   ], [/* ])

m4_ifdef([GCC_TARGET_TEMPLATE($1)],[],[#ifndef USED_FOR_TARGET

])[#undef $1]m4_ifdef([GCC_TARGET_TEMPLATE($1)],[],[

#endif

]))])

dnl Make sure that build_exeext is looked for

AC_DEFUN([gcc_AC_BUILD_EXEEXT], [

ac_executable_extensions="$build_exeext"])