--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libffi/acinclude.m4	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,473 @@
+# mmap(2) blacklisting.  Some platforms provide the mmap library routine
+# but don't support all of the features we need from it.
+AC_DEFUN([AC_FUNC_MMAP_BLACKLIST],
+[
+AC_CHECK_HEADER([sys/mman.h],
+		[libffi_header_sys_mman_h=yes], [libffi_header_sys_mman_h=no])
+AC_CHECK_FUNC([mmap], [libffi_func_mmap=yes], [libffi_func_mmap=no])
+if test "$libffi_header_sys_mman_h" != yes \
+ || test "$libffi_func_mmap" != yes; then
+   ac_cv_func_mmap_file=no
+   ac_cv_func_mmap_dev_zero=no
+   ac_cv_func_mmap_anon=no
+else
+   AC_CACHE_CHECK([whether read-only mmap of a plain file works],
+  ac_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 "$host_os" in
+     vms* | ultrix*)
+	ac_cv_func_mmap_file=no ;;
+     *)
+	ac_cv_func_mmap_file=yes;;
+   esac])
+   AC_CACHE_CHECK([whether mmap from /dev/zero works],
+  ac_cv_func_mmap_dev_zero,
+  [# Add a system to this blacklist if it has mmap() but /dev/zero
+   # does not exist, or if mmapping /dev/zero does not give anonymous
+   # zeroed pages with both the following properties:
+   # 1. If you map N consecutive pages in with one call, and then
+   #    unmap any subset of those pages, the pages that were not
+   #    explicitly unmapped remain accessible.
+   # 2. If you map two adjacent blocks of memory and then unmap them
+   #    both at once, they must both go away.
+   # Systems known to be in this category are Windows (all variants),
+   # VMS, and Darwin.
+   case "$host_os" in
+     vms* | cygwin* | pe | mingw* | darwin* | ultrix* | hpux10* | hpux11.00)
+	ac_cv_func_mmap_dev_zero=no ;;
+     *)
+	ac_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)], ac_cv_decl_map_anon,
+    [AC_TRY_COMPILE(
+[#include <sys/types.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#ifndef MAP_ANONYMOUS
+#define MAP_ANONYMOUS MAP_ANON
+#endif
+],
+[int n = MAP_ANONYMOUS;],
+    ac_cv_decl_map_anon=yes,
+    ac_cv_decl_map_anon=no)])
+
+   if test $ac_cv_decl_map_anon = no; then
+     ac_cv_func_mmap_anon=no
+   else
+     AC_CACHE_CHECK([whether mmap with MAP_ANON(YMOUS) works],
+     ac_cv_func_mmap_anon,
+  [# Add a system to this blacklist if it has mmap() and MAP_ANON or
+   # MAP_ANONYMOUS, but using mmap(..., MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
+   # doesn't give anonymous zeroed pages with the same properties listed
+   # above for use of /dev/zero.
+   # Systems known to be in this category are Windows, VMS, and SCO Unix.
+   case "$host_os" in
+     vms* | cygwin* | pe | mingw* | sco* | udk* )
+	ac_cv_func_mmap_anon=no ;;
+     *)
+	ac_cv_func_mmap_anon=yes;;
+   esac])
+   fi
+fi
+
+if test $ac_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 $ac_cv_func_mmap_dev_zero = yes; then
+  AC_DEFINE(HAVE_MMAP_DEV_ZERO, 1,
+	    [Define if mmap of /dev/zero works.])
+fi
+if test $ac_cv_func_mmap_anon = yes; then
+  AC_DEFINE(HAVE_MMAP_ANON, 1,
+	    [Define if mmap with MAP_ANON(YMOUS) works.])
+fi
+])
+
+dnl ----------------------------------------------------------------------
+dnl This whole bit snagged from libstdc++-v3, via libatomic.
+
+dnl
+dnl LIBAT_ENABLE
+dnl    (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)
+dnl    (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)
+dnl    (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)
+dnl
+dnl See docs/html/17_intro/configury.html#enable for documentation.
+dnl
+m4_define([LIBAT_ENABLE],[dnl
+m4_define([_g_switch],[--enable-$1])dnl
+m4_define([_g_help],[AC_HELP_STRING(_g_switch$3,[$4 @<:@default=$2@:>@])])dnl
+ AC_ARG_ENABLE($1,_g_help,
+  m4_bmatch([$5],
+   [^permit ],
+     [[
+      case "$enableval" in
+       m4_bpatsubst([$5],[permit ])) ;;
+       *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;
+          dnl Idea for future:  generate a URL pointing to
+          dnl "onlinedocs/configopts.html#whatever"
+      esac
+     ]],
+   [^$],
+     [[
+      case "$enableval" in
+       yes|no) ;;
+       *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;
+      esac
+     ]],
+   [[$5]]),
+  [enable_]m4_bpatsubst([$1],-,_)[=][$2])
+m4_undefine([_g_switch])dnl
+m4_undefine([_g_help])dnl
+])
+
+dnl
+dnl If GNU ld is in use, check to see if tricky linker opts can be used.  If
+dnl the native linker is in use, all variables will be defined to something
+dnl safe (like an empty string).
+dnl
+dnl Defines:
+dnl  SECTION_LDFLAGS='-Wl,--gc-sections' if possible
+dnl  OPT_LDFLAGS='-Wl,-O1' if possible
+dnl  LD (as a side effect of testing)
+dnl Sets:
+dnl  with_gnu_ld
+dnl  libat_ld_is_gold (possibly)
+dnl  libat_gnu_ld_version (possibly)
+dnl
+dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will
+dnl set libat_gnu_ld_version to 12345.  Zeros cause problems.
+dnl
+AC_DEFUN([LIBAT_CHECK_LINKER_FEATURES], [
+  # If we're not using GNU ld, then there's no point in even trying these
+  # tests.  Check for that first.  We should have already tested for gld
+  # by now (in libtool), but require it now just to be safe...
+  test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS=''
+  test -z "$OPT_LDFLAGS" && OPT_LDFLAGS=''
+  AC_REQUIRE([AC_PROG_LD])
+  AC_REQUIRE([AC_PROG_AWK])
+
+  # The name set by libtool depends on the version of libtool.  Shame on us
+  # for depending on an impl detail, but c'est la vie.  Older versions used
+  # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on
+  # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually
+  # makes sense).  We'll test with_gnu_ld everywhere else, so if that isn't
+  # set (hence we're using an older libtool), then set it.
+  if test x${with_gnu_ld+set} != xset; then
+    if test x${ac_cv_prog_gnu_ld+set} != xset; then
+      # We got through "ac_require(ac_prog_ld)" and still not set?  Huh?
+      with_gnu_ld=no
+    else
+      with_gnu_ld=$ac_cv_prog_gnu_ld
+    fi
+  fi
+
+  # Start by getting the version number.  I think the libtool test already
+  # does some of this, but throws away the result.
+  libat_ld_is_gold=no
+  if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then
+    libat_ld_is_gold=yes
+  fi
+  changequote(,)
+  ldver=`$LD --version 2>/dev/null |
+         sed -e 's/GNU gold /GNU ld /;s/GNU ld version /GNU ld /;s/GNU ld ([^)]*) /GNU ld /;s/GNU ld \([0-9.][0-9.]*\).*/\1/; q'`
+  changequote([,])
+  libat_gnu_ld_version=`echo $ldver | \
+         $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'`
+
+  # Set --gc-sections.
+  if test "$with_gnu_ld" = "notbroken"; then
+    # GNU ld it is!  Joy and bunny rabbits!
+
+    # All these tests are for C++; save the language and the compiler flags.
+    # Need to do this so that g++ won't try to link in libstdc++
+    ac_test_CFLAGS="${CFLAGS+set}"
+    ac_save_CFLAGS="$CFLAGS"
+    CFLAGS='-x c++  -Wl,--gc-sections'
+
+    # Check for -Wl,--gc-sections
+    # XXX This test is broken at the moment, as symbols required for linking
+    # are now in libsupc++ (not built yet).  In addition, this test has
+    # cored on solaris in the past.  In addition, --gc-sections doesn't
+    # really work at the moment (keeps on discarding used sections, first
+    # .eh_frame and now some of the glibc sections for iconv).
+    # Bzzzzt.  Thanks for playing, maybe next time.
+    AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections])
+    AC_TRY_RUN([
+     int main(void)
+     {
+       try { throw 1; }
+       catch (...) { };
+       return 0;
+     }
+    ], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes])
+    if test "$ac_test_CFLAGS" = set; then
+      CFLAGS="$ac_save_CFLAGS"
+    else
+      # this is the suspicious part
+      CFLAGS=''
+    fi
+    if test "$ac_sectionLDflags" = "yes"; then
+      SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS"
+    fi
+    AC_MSG_RESULT($ac_sectionLDflags)
+  fi
+
+  # Set linker optimization flags.
+  if test x"$with_gnu_ld" = x"yes"; then
+    OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
+  fi
+
+  AC_SUBST(SECTION_LDFLAGS)
+  AC_SUBST(OPT_LDFLAGS)
+])
+
+
+dnl
+dnl If GNU ld is in use, check to see if tricky linker opts can be used.  If
+dnl the native linker is in use, all variables will be defined to something
+dnl safe (like an empty string).
+dnl
+dnl Defines:
+dnl  SECTION_LDFLAGS='-Wl,--gc-sections' if possible
+dnl  OPT_LDFLAGS='-Wl,-O1' if possible
+dnl  LD (as a side effect of testing)
+dnl Sets:
+dnl  with_gnu_ld
+dnl  libat_ld_is_gold (possibly)
+dnl  libat_gnu_ld_version (possibly)
+dnl
+dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will
+dnl set libat_gnu_ld_version to 12345.  Zeros cause problems.
+dnl
+AC_DEFUN([LIBAT_CHECK_LINKER_FEATURES], [
+  # If we're not using GNU ld, then there's no point in even trying these
+  # tests.  Check for that first.  We should have already tested for gld
+  # by now (in libtool), but require it now just to be safe...
+  test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS=''
+  test -z "$OPT_LDFLAGS" && OPT_LDFLAGS=''
+  AC_REQUIRE([AC_PROG_LD])
+  AC_REQUIRE([AC_PROG_AWK])
+
+  # The name set by libtool depends on the version of libtool.  Shame on us
+  # for depending on an impl detail, but c'est la vie.  Older versions used
+  # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on
+  # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually
+  # makes sense).  We'll test with_gnu_ld everywhere else, so if that isn't
+  # set (hence we're using an older libtool), then set it.
+  if test x${with_gnu_ld+set} != xset; then
+    if test x${ac_cv_prog_gnu_ld+set} != xset; then
+      # We got through "ac_require(ac_prog_ld)" and still not set?  Huh?
+      with_gnu_ld=no
+    else
+      with_gnu_ld=$ac_cv_prog_gnu_ld
+    fi
+  fi
+
+  # Start by getting the version number.  I think the libtool test already
+  # does some of this, but throws away the result.
+  libat_ld_is_gold=no
+  if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then
+    libat_ld_is_gold=yes
+  fi
+  changequote(,)
+  ldver=`$LD --version 2>/dev/null |
+         sed -e 's/GNU gold /GNU ld /;s/GNU ld version /GNU ld /;s/GNU ld ([^)]*) /GNU ld /;s/GNU ld \([0-9.][0-9.]*\).*/\1/; q'`
+  changequote([,])
+  libat_gnu_ld_version=`echo $ldver | \
+         $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'`
+
+  # Set --gc-sections.
+  if test "$with_gnu_ld" = "notbroken"; then
+    # GNU ld it is!  Joy and bunny rabbits!
+
+    # All these tests are for C++; save the language and the compiler flags.
+    # Need to do this so that g++ won't try to link in libstdc++
+    ac_test_CFLAGS="${CFLAGS+set}"
+    ac_save_CFLAGS="$CFLAGS"
+    CFLAGS='-x c++  -Wl,--gc-sections'
+
+    # Check for -Wl,--gc-sections
+    # XXX This test is broken at the moment, as symbols required for linking
+    # are now in libsupc++ (not built yet).  In addition, this test has
+    # cored on solaris in the past.  In addition, --gc-sections doesn't
+    # really work at the moment (keeps on discarding used sections, first
+    # .eh_frame and now some of the glibc sections for iconv).
+    # Bzzzzt.  Thanks for playing, maybe next time.
+    AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections])
+    AC_TRY_RUN([
+     int main(void)
+     {
+       try { throw 1; }
+       catch (...) { };
+       return 0;
+     }
+    ], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes])
+    if test "$ac_test_CFLAGS" = set; then
+      CFLAGS="$ac_save_CFLAGS"
+    else
+      # this is the suspicious part
+      CFLAGS=''
+    fi
+    if test "$ac_sectionLDflags" = "yes"; then
+      SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS"
+    fi
+    AC_MSG_RESULT($ac_sectionLDflags)
+  fi
+
+  # Set linker optimization flags.
+  if test x"$with_gnu_ld" = x"yes"; then
+    OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
+  fi
+
+  AC_SUBST(SECTION_LDFLAGS)
+  AC_SUBST(OPT_LDFLAGS)
+])
+
+
+dnl
+dnl Add version tags to symbols in shared library (or not), additionally
+dnl marking other symbols as private/local (or not).
+dnl
+dnl --enable-symvers=style adds a version script to the linker call when
+dnl       creating the shared library.  The choice of version script is
+dnl       controlled by 'style'.
+dnl --disable-symvers does not.
+dnl  +  Usage:  LIBAT_ENABLE_SYMVERS[(DEFAULT)]
+dnl       Where DEFAULT is either 'yes' or 'no'.  Passing `yes' tries to
+dnl       choose a default style based on linker characteristics.  Passing
+dnl       'no' disables versioning.
+dnl
+AC_DEFUN([LIBAT_ENABLE_SYMVERS], [
+
+LIBAT_ENABLE(symvers,yes,[=STYLE],
+  [enables symbol versioning of the shared library],
+  [permit yes|no|gnu*|sun])
+
+# If we never went through the LIBAT_CHECK_LINKER_FEATURES macro, then we
+# don't know enough about $LD to do tricks...
+AC_REQUIRE([LIBAT_CHECK_LINKER_FEATURES])
+
+# Turn a 'yes' into a suitable default.
+if test x$enable_symvers = xyes ; then
+  # FIXME  The following test is too strict, in theory.
+  if test $enable_shared = no || test "x$LD" = x; then
+    enable_symvers=no
+  else
+    if test $with_gnu_ld = yes ; then
+      enable_symvers=gnu
+    else
+      case ${target_os} in
+        # Sun symbol versioning exists since Solaris 2.5.
+        solaris2.[[5-9]]* | solaris2.1[[0-9]]*)
+          enable_symvers=sun ;;
+        *)
+          enable_symvers=no ;;
+      esac
+    fi
+  fi
+fi
+
+# Check if 'sun' was requested on non-Solaris 2 platforms.
+if test x$enable_symvers = xsun ; then
+  case ${target_os} in
+    solaris2*)
+      # All fine.
+      ;;
+    *)
+      # Unlikely to work.
+      AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
+      AC_MSG_WARN([=== you are not targetting Solaris 2.])
+      AC_MSG_WARN([=== Symbol versioning will be disabled.])
+      enable_symvers=no
+      ;;
+  esac
+fi
+
+# Check to see if libgcc_s exists, indicating that shared libgcc is possible.
+if test $enable_symvers != no; then
+  AC_MSG_CHECKING([for shared libgcc])
+  ac_save_CFLAGS="$CFLAGS"
+  CFLAGS=' -lgcc_s'
+  AC_TRY_LINK(, [return 0;], libat_shared_libgcc=yes, libat_shared_libgcc=no)
+  CFLAGS="$ac_save_CFLAGS"
+  if test $libat_shared_libgcc = no; then
+    cat > conftest.c <<EOF
+int main (void) { return 0; }
+EOF
+changequote(,)dnl
+    libat_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
+			     -shared -shared-libgcc -o conftest.so \
+			     conftest.c -v 2>&1 >/dev/null \
+			     | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
+changequote([,])dnl
+    rm -f conftest.c conftest.so
+    if test x${libat_libgcc_s_suffix+set} = xset; then
+      CFLAGS=" -lgcc_s$libat_libgcc_s_suffix"
+      AC_TRY_LINK(, [return 0;], libat_shared_libgcc=yes)
+      CFLAGS="$ac_save_CFLAGS"
+    fi
+  fi
+  AC_MSG_RESULT($libat_shared_libgcc)
+fi
+
+# For GNU ld, we need at least this version.  The format is described in
+# LIBAT_CHECK_LINKER_FEATURES above.
+libat_min_gnu_ld_version=21400
+# XXXXXXXXXXX libat_gnu_ld_version=21390
+
+# Check to see if unspecified "yes" value can win, given results above.
+# Change "yes" into either "no" or a style name.
+if test $enable_symvers != no && test $libat_shared_libgcc = yes; then
+  if test $with_gnu_ld = yes; then
+    if test $libat_gnu_ld_version -ge $libat_min_gnu_ld_version ; then
+      enable_symvers=gnu
+    elif test $libat_ld_is_gold = yes ; then
+      enable_symvers=gnu
+    else
+      # The right tools, the right setup, but too old.  Fallbacks?
+      AC_MSG_WARN(=== Linker version $libat_gnu_ld_version is too old for)
+      AC_MSG_WARN(=== full symbol versioning support in this release of GCC.)
+      AC_MSG_WARN(=== You would need to upgrade your binutils to version)
+      AC_MSG_WARN(=== $libat_min_gnu_ld_version or later and rebuild GCC.)
+      if test $libat_gnu_ld_version -ge 21200 ; then
+        # Globbing fix is present, proper block support is not.
+        dnl AC_MSG_WARN([=== Dude, you are soooo close.  Maybe we can fake it.])
+        dnl enable_symvers=???
+        AC_MSG_WARN([=== Symbol versioning will be disabled.])
+        enable_symvers=no
+      else
+        # 2.11 or older.
+        AC_MSG_WARN([=== Symbol versioning will be disabled.])
+        enable_symvers=no
+      fi
+    fi
+  elif test $enable_symvers = sun; then
+    : All interesting versions of Sun ld support sun style symbol versioning.
+  else
+    # just fail for now
+    AC_MSG_WARN([=== You have requested some kind of symbol versioning, but])
+    AC_MSG_WARN([=== either you are not using a supported linker, or you are])
+    AC_MSG_WARN([=== not building a shared libgcc_s (which is required).])
+    AC_MSG_WARN([=== Symbol versioning will be disabled.])
+    enable_symvers=no
+  fi
+fi
+if test $enable_symvers = gnu; then
+  AC_DEFINE(LIBAT_GNU_SYMBOL_VERSIONING, 1,
+	    [Define to 1 if GNU symbol versioning is used for libatomic.])
+fi
+
+AM_CONDITIONAL(LIBAT_BUILD_VERSIONED_SHLIB, test $enable_symvers != no)
+AM_CONDITIONAL(LIBAT_BUILD_VERSIONED_SHLIB_GNU, test $enable_symvers = gnu)
+AM_CONDITIONAL(LIBAT_BUILD_VERSIONED_SHLIB_SUN, test $enable_symvers = sun)
+AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers)
+])