-# This file can be copied and used freely without restrictions. It can
-# be used in projects which are not available under the GNU Public License
-# but which still want to provide support for the GNU gettext functionality.
-# Please note that the actual code is *not* freely available.
-
-# serial 1
-
-dnl GCC_PATH_PROG_WITH_TEST(VARIABLE, PROG-TO-CHECK-FOR,
-dnl TEST-PERFORMED-ON-FOUND_PROGRAM [, VALUE-IF-NOT-FOUND [, PATH]])
-AC_DEFUN(GCC_PATH_PROG_WITH_TEST,
-[# 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(gcc_cv_path_$1,
-[case "[$]$1" in
- /*)
- gcc_cv_path_$1="[$]$1" # Let the user override the test with a path.
- ;;
- *)
- IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS="${IFS}:"
- for ac_dir in ifelse([$5], , $PATH, [$5]); do
- test -z "$ac_dir" && ac_dir=.
- if test -f $ac_dir/$ac_word; then
- if [$3]; then
- gcc_cv_path_$1="$ac_dir/$ac_word"
- break
- fi
- fi
- done
- IFS="$ac_save_ifs"
-dnl If no 4th arg is given, leave the cache variable unset,
-dnl so GCC_PATH_PROGS will keep looking.
-ifelse([$4], , , [ test -z "[$]gcc_cv_path_$1" && gcc_cv_path_$1="$4"
-])dnl
- ;;
-esac])dnl
-$1="$gcc_cv_path_$1"
-if test -n "[$]$1"; then
- AC_MSG_RESULT([$]$1)
-else
- AC_MSG_RESULT(no)
-fi
-AC_SUBST($1)dnl
-])
-
-# Check whether mmap can map an arbitrary page from /dev/zero or with
-# MAP_ANONYMOUS, without MAP_FIXED.
-AC_DEFUN([AC_FUNC_MMAP_ANYWHERE],
-[AC_CHECK_FUNCS(getpagesize)
-# The test program for the next two tests is the same except for one
-# set of ifdefs.
-changequote({{{,}}})dnl
-{{{cat >ct-mmap.inc <<'EOF'
-#include <sys/types.h>
-#include <sys/mman.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <setjmp.h>
-#include <stdio.h>
-
-#if !defined (MAP_ANONYMOUS) && defined (MAP_ANON)
-# define MAP_ANONYMOUS MAP_ANON
-#endif
-
-/* This mess was copied from the GNU getpagesize.h. */
-#ifndef HAVE_GETPAGESIZE
-# ifdef HAVE_UNISTD_H
-# include <unistd.h>
-# endif
-
-/* Assume that all systems that can run configure have sys/param.h. */
-# ifndef HAVE_SYS_PARAM_H
-# define HAVE_SYS_PARAM_H 1
-# endif
-
-# ifdef _SC_PAGESIZE
-# define getpagesize() sysconf(_SC_PAGESIZE)
-# else /* no _SC_PAGESIZE */
-# ifdef HAVE_SYS_PARAM_H
-# include <sys/param.h>
-# ifdef EXEC_PAGESIZE
-# define getpagesize() EXEC_PAGESIZE
-# else /* no EXEC_PAGESIZE */
-# ifdef NBPG
-# define getpagesize() NBPG * CLSIZE
-# ifndef CLSIZE
-# define CLSIZE 1
-# endif /* no CLSIZE */
-# else /* no NBPG */
-# ifdef NBPC
-# define getpagesize() NBPC
-# else /* no NBPC */
-# ifdef PAGESIZE
-# define getpagesize() PAGESIZE
-# endif /* PAGESIZE */
-# endif /* no NBPC */
-# endif /* no NBPG */
-# endif /* no EXEC_PAGESIZE */
-# else /* no HAVE_SYS_PARAM_H */
-# define getpagesize() 8192 /* punt totally */
-# endif /* no HAVE_SYS_PARAM_H */
-# endif /* no _SC_PAGESIZE */
-
-#endif /* no HAVE_GETPAGESIZE */
-
-#ifndef MAP_FAILED
-# define MAP_FAILED -1
-#endif
-
-#undef perror_exit
-#define perror_exit(str, val) \
- do { perror(str); exit(val); } while (0)
-
-/* Some versions of cygwin mmap require that munmap is called with the
- same parameters as mmap. GCC expects that this is not the case.
- Test for various forms of this problem. Warning - icky signal games. */
-
-static sigset_t unblock_sigsegv;
-static jmp_buf r;
-static size_t pg;
-static int devzero;
-
-static char *
-anonmap (size)
- size_t size;
-{
-#ifdef USE_MAP_ANON
- return (char *) mmap (0, size, PROT_READ|PROT_WRITE,
- MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
-#else
- return (char *) mmap (0, size, PROT_READ|PROT_WRITE,
- MAP_PRIVATE, devzero, 0);
-#endif
-}
-
-static void
-sigsegv (unused)
- int unused;
-{
- sigprocmask (SIG_UNBLOCK, &unblock_sigsegv, 0);
- longjmp (r, 1);
-}
-
-/* Basic functionality test. */
-void
-test_0 ()
-{
- char *x = anonmap (pg);
- if (x == (char *) MAP_FAILED)
- perror_exit("test 0 mmap", 2);
-
- *(int *)x += 1;
-
- if (munmap(x, pg) < 0)
- perror_exit("test 0 munmap", 3);
-}
-
-/* 1. If we map a 2-page region and unmap its second page, the first page
- must remain. */
-static void
-test_1 ()
-{
- char *x = anonmap (pg * 2);
- if (x == (char *)MAP_FAILED)
- perror_exit ("test 1 mmap", 4);
-
- signal (SIGSEGV, sigsegv);
- if (setjmp (r))
- perror_exit ("test 1 fault", 5);
-
- x[0] = 1;
- x[pg] = 1;
-
- if (munmap (x + pg, pg) < 0)
- perror_exit ("test 1 munmap 1", 6);
- x[0] = 2;
-
- if (setjmp (r) == 0)
- {
- x[pg] = 1;
- perror_exit ("test 1 no fault", 7);
- }
- if (munmap (x, pg) < 0)
- perror_exit ("test 1 munmap 2", 8);
-}
-
-/* 2. If we map a 2-page region and unmap its first page, the second
- page must remain. */
-static void
-test_2 ()
-{
- char *x = anonmap (pg * 2);
- if (x == (char *)MAP_FAILED)
- perror_exit ("test 2 mmap", 9);
-
- signal (SIGSEGV, sigsegv);
- if (setjmp (r))
- perror_exit ("test 2 fault", 10);
-
- x[0] = 1;
- x[pg] = 1;
-
- if (munmap (x, pg) < 0)
- perror_exit ("test 2 munmap 1", 11);
-
- x[pg] = 2;
-
- if (setjmp (r) == 0)
- {
- x[0] = 1;
- perror_exit ("test 2 no fault", 12);
- }
-
- if (munmap (x+pg, pg) < 0)
- perror_exit ("test 2 munmap 2", 13);
-}
-
-/* 3. If we map two adjacent 1-page regions and unmap them both with
- one munmap, both must go away.
-
- Getting two adjacent 1-page regions with two mmap calls is slightly
- tricky. All OS's tested skip over already-allocated blocks; therefore
- we have been careful to unmap all allocated regions in previous tests.
- HP/UX allocates pages backward in memory. No OS has yet been observed
- to be so perverse as to leave unmapped space between consecutive calls
- to mmap. */
-
-static void
-test_3 ()
-{
- char *x, *y, *z;
-
- x = anonmap (pg);
- if (x == (char *)MAP_FAILED)
- perror_exit ("test 3 mmap 1", 14);
- y = anonmap (pg);
- if (y == (char *)MAP_FAILED)
- perror_exit ("test 3 mmap 2", 15);
-
- if (y != x + pg)
- {
- if (y == x - pg)
- z = y, y = x, x = z;
- else
- {
- fprintf (stderr, "test 3 nonconsecutive pages - %lx, %lx\n",
- (unsigned long)x, (unsigned long)y);
- exit (16);
- }
- }
-
- signal (SIGSEGV, sigsegv);
- if (setjmp (r))
- perror_exit ("test 3 fault", 17);
-
- x[0] = 1;
- y[0] = 1;
-
- if (munmap (x, pg*2) < 0)
- perror_exit ("test 3 munmap", 18);
-
- if (setjmp (r) == 0)
- {
- x[0] = 1;
- perror_exit ("test 3 no fault 1", 19);
- }
-
- signal (SIGSEGV, sigsegv);
- if (setjmp (r) == 0)
- {
- y[0] = 1;
- perror_exit ("test 3 no fault 2", 20);
- }
-}
-
-int
-main ()
-{
- sigemptyset (&unblock_sigsegv);
- sigaddset (&unblock_sigsegv, SIGSEGV);
- pg = getpagesize ();
-#ifndef USE_MAP_ANON
- devzero = open ("/dev/zero", O_RDWR);
- if (devzero < 0)
- perror_exit ("open /dev/zero", 1);
-#endif
-
- test_0();
- test_1();
- test_2();
- test_3();
-
- exit(0);
-}
-EOF}}}
-changequote([,])dnl
-
-AC_CACHE_CHECK(for working mmap from /dev/zero,
- ac_cv_func_mmap_dev_zero,
-[AC_TRY_RUN(
- [#include "ct-mmap.inc"],
- ac_cv_func_mmap_dev_zero=yes,
- [if test $? -lt 4
- then ac_cv_func_mmap_dev_zero=no
- else ac_cv_func_mmap_dev_zero=buggy
- fi],
- # If this is not cygwin, and /dev/zero is a character device, it's probably
- # safe to assume it works.
- [case "$host_os" in
- cygwin* | win32 | pe | mingw* ) ac_cv_func_mmap_dev_zero=buggy ;;
- * ) if test -c /dev/zero
- then ac_cv_func_mmap_dev_zero=yes
- else ac_cv_func_mmap_dev_zero=no
- fi ;;
- esac])
-])
-if test $ac_cv_func_mmap_dev_zero = yes; then
- AC_DEFINE(HAVE_MMAP_DEV_ZERO, 1,
- [Define if mmap can get us zeroed pages from /dev/zero.])
-fi
-
-AC_CACHE_CHECK([for working mmap with MAP_ANON(YMOUS)],
- ac_cv_func_mmap_anon,
-[AC_TRY_RUN(
- [#define USE_MAP_ANON
-#include "ct-mmap.inc"],
- ac_cv_func_mmap_anon=yes,
- [if test $? -lt 4
- then ac_cv_func_mmap_anon=no
- else ac_cv_func_mmap_anon=buggy
- fi],
- # Unlike /dev/zero, it is not safe to assume MAP_ANON(YMOUS) works
- # just because it's there. Some SCO Un*xen define it but don't implement it.
- ac_cv_func_mmap_anon=no)
-])
-if test $ac_cv_func_mmap_anon = yes; then
- AC_DEFINE(HAVE_MMAP_ANON, 1,
- [Define if mmap can get us zeroed pages using MAP_ANON(YMOUS).])
-fi
-rm -f ct-mmap.inc
-])
-
-# Check whether mmap can map a plain file, without MAP_FIXED.
-AC_DEFUN([AC_FUNC_MMAP_FILE],
-[AC_CACHE_CHECK(for working mmap of a file, ac_cv_func_mmap_file,
-[# Create a file one thousand bytes long.
-for i in 1 2 3 4 5 6 7 8 9 0
-do for j in 1 2 3 4 5 6 7 8 9 0
-do echo $i $j xxxxx
-done
-done > conftestdata$$
-
-AC_TRY_RUN([
-/* Test by Zack Weinberg. Modified from MMAP_ANYWHERE test by
- Richard Henderson and Alexandre Oliva.
- Check whether read-only mmap of a plain file works. */
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <sys/mman.h>
-
-int main()
-{
- char *x;
- int fd;
- struct stat st;
-
- fd = open("conftestdata$$", O_RDONLY);
- if (fd < 0)
- exit(1);
-
- if (fstat (fd, &st))
- exit(2);
-
- x = (char*)mmap(0, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
- if (x == (char *) -1)
- exit(3);
-
- if (x[0] != '1' || x[1] != ' ' || x[2] != '1' || x[3] != ' ')
- exit(4);
-
- if (munmap(x, st.st_size) < 0)
- exit(5);
-
- exit(0);
-}], ac_cv_func_mmap_file=yes, ac_cv_func_mmap_file=no,
-ac_cv_func_mmap_file=no)])
-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
-])
-
-dnl Locate a program and check that its version is acceptable.
-dnl AC_PROG_CHECK_VER(var, name, version-switch,
-dnl version-extract-regexp, version-glob)
-AC_DEFUN(gcc_AC_CHECK_PROG_VER,
-[AC_CHECK_PROG([$1], [$2], [$2])
-if test -n "[$]$1"; then
- # Found it, now check the version.
- AC_CACHE_CHECK(for modern $2, gcc_cv_prog_$2_modern,
-[changequote(<<,>>)dnl
- ac_prog_version=`<<$>>$1 $3 2>&1 |
- sed -n 's/^.*patsubst(<<$4>>,/,\/).*$/\1/p'`
-changequote([,])dnl
- echo "configure:__oline__: version of $2 is $ac_prog_version" >&AC_FD_CC
-changequote(<<,>>)dnl
- case $ac_prog_version in
- '') gcc_cv_prog_$2_modern=no;;
- <<$5>>)
- gcc_cv_prog_$2_modern=yes;;
- *) gcc_cv_prog_$2_modern=no;;
- esac
-changequote([,])dnl
-])
-else
- gcc_cv_prog_$2_modern=no
-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_TRY_RUN(#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 Host type sizes probe.
-dnl By Kaveh R. Ghazi. One typo fixed since.
-dnl
-AC_DEFUN([gcc_AC_COMPILE_CHECK_SIZEOF],
-[changequote(<<, >>)dnl
-dnl The name to #define.
-define(<<AC_TYPE_NAME>>, translit(sizeof_$1, [a-z *], [A-Z_P]))dnl
-dnl The cache variable name.
-define(<<AC_CV_NAME>>, translit(ac_cv_sizeof_$1, [ *], [_p]))dnl
-changequote([, ])dnl
-AC_MSG_CHECKING(size of $1)
-AC_CACHE_VAL(AC_CV_NAME,
-[for ac_size in 4 8 1 2 16 $3 ; do # List sizes in rough order of prevalence.
- AC_TRY_COMPILE([#include "confdefs.h"
-#include <sys/types.h>
-$2
-], [switch (0) case 0: case (sizeof ($1) == $ac_size):;], AC_CV_NAME=$ac_size)
- if test x$AC_CV_NAME != x ; then break; fi
-done
-])
-if test x$AC_CV_NAME = x ; then
- AC_MSG_ERROR([cannot determine a size for $1])
-fi
-AC_MSG_RESULT($AC_CV_NAME)
-AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [The number of bytes in type $1])
-undefine([AC_TYPE_NAME])dnl
-undefine([AC_CV_NAME])dnl
-])
-
-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_TRY_COMPILE(,
- [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])
-
-dnl Checking for long long.
-dnl By Caolan McNamara <caolan@skynet.ie>
-dnl Added check for __int64, Zack Weinberg <zackw@stanford.edu>
-dnl
-AC_DEFUN([gcc_AC_C_LONG_LONG],
-[AC_CACHE_CHECK(for long long int, ac_cv_c_long_long,
- [AC_TRY_COMPILE(,[long long int i;],
- ac_cv_c_long_long=yes,
- ac_cv_c_long_long=no)])
- if test $ac_cv_c_long_long = yes; then
- AC_DEFINE(HAVE_LONG_LONG, 1,
- [Define if your compiler supports the \`long long' type.])
- fi
-AC_CACHE_CHECK(for __int64, ac_cv_c___int64,
- [AC_TRY_COMPILE(,[__int64 i;],
- ac_cv_c___int64=yes,
- ac_cv_c___int64=no)])
- if test $ac_cv_c___int64 = yes; then
- AC_DEFINE(HAVE___INT64, 1,
- [Define if your compiler supports the \`__int64' type.])
- fi
-])
-
-dnl Host character set probe.
-dnl The EBCDIC values match the table in config/i370/i370.c;
-dnl there are other versions of EBCDIC but GCC won't work with them.
-dnl
-AC_DEFUN([gcc_AC_C_CHARSET],
-[AC_CACHE_CHECK(execution character set, ac_cv_c_charset,
- [AC_EGREP_CPP(ASCII,
-[#if '\n' == 0x0A && ' ' == 0x20 && '0' == 0x30 \
- && 'A' == 0x41 && 'a' == 0x61 && '!' == 0x21
-ASCII
-#endif], ac_cv_c_charset=ASCII)
- if test x${ac_cv_c_charset+set} != xset; then
- AC_EGREP_CPP(EBCDIC,
-[#if '\n' == 0x15 && ' ' == 0x40 && '0' == 0xF0 \
- && 'A' == 0xC1 && 'a' == 0x81 && '!' == 0x5A
-EBCDIC
-#endif], ac_cv_c_charset=EBCDIC)
- fi
- if test x${ac_cv_c_charset+set} != xset; then
- ac_cv_c_charset=unknown
- fi])
-if test $ac_cv_c_charset = unknown; then
- AC_MSG_ERROR([*** Cannot determine host character set.])
-elif test $ac_cv_c_charset = EBCDIC; then
- AC_DEFINE(HOST_EBCDIC, 1,
- [Define if the host execution character set is EBCDIC.])
-fi])
-
-dnl Utility macro used by next two tests.
-dnl AC_EXAMINE_OBJECT(C source code,
-dnl commands examining object file,
-dnl [commands to run if compile failed]):
-dnl
-dnl Compile the source code to an object file; then convert it into a
-dnl printable representation. All unprintable characters and
-dnl asterisks (*) are replaced by dots (.). All white space is
-dnl deleted. Newlines (ASCII 0x10) in the input are preserved in the
-dnl output, but runs of newlines are compressed to a single newline.
-dnl Finally, line breaks are forcibly inserted so that no line is
-dnl longer than 80 columns and the file ends with a newline. The
-dnl result of all this processing is in the file conftest.dmp, which
-dnl may be examined by the commands in the second argument.
-dnl
-AC_DEFUN([gcc_AC_EXAMINE_OBJECT],
-[AC_LANG_SAVE
-AC_LANG_C
-dnl Next bit cribbed from AC_TRY_COMPILE.
-cat > conftest.$ac_ext <<EOF
-[#line __oline__ "configure"
-#include "confdefs.h"
-$1
-]EOF
-if AC_TRY_EVAL(ac_compile); then
- od -c conftest.o |
- sed ['s/^[0-7]*[ ]*/ /
- s/\*/./g
- s/ \\n/*/g
- s/ [0-9][0-9][0-9]/./g
- s/ \\[^ ]/./g'] |
- tr -d '
- ' | tr -s '*' '
-' | fold | sed '$a\
-' > conftest.dmp
- $2
-ifelse($3, , , else
- $3
-)dnl
-fi
-rm -rf conftest*
-AC_LANG_RESTORE])
-
-dnl Host endianness probe.
-dnl This tests byte-within-word endianness. GCC actually needs
-dnl to know word-within-larger-object endianness. They are the
-dnl same on all presently supported hosts.
-dnl Differs from AC_C_BIGENDIAN in that it does not require
-dnl running a program on the host, and it defines the macro we
-dnl want to see.
-dnl
-AC_DEFUN([gcc_AC_C_COMPILE_ENDIAN],
-[AC_CACHE_CHECK(byte ordering, ac_cv_c_compile_endian,
-[ac_cv_c_compile_endian=unknown
-gcc_AC_EXAMINE_OBJECT([
-#ifdef HAVE_LIMITS_H
-# include <limits.h>
-#endif
-/* This structure must have no internal padding. */
- struct {
- char prefix[sizeof "\nendian:" - 1];
- short word;
- char postfix[2];
- } tester = {
- "\nendian:",
-#if SIZEOF_SHORT == 4
- ('A' << (CHAR_BIT * 3)) | ('B' << (CHAR_BIT * 2)) |
-#endif
- ('A' << CHAR_BIT) | 'B',
- 'X', '\n'
-};],
- [if grep 'endian:AB' conftest.dmp >/dev/null 2>&1; then
- ac_cv_c_compile_endian=big-endian
- elif grep 'endian:BA' conftest.dmp >/dev/null 2>&1; then
- ac_cv_c_compile_endian=little-endian
- fi])
-])
-if test $ac_cv_c_compile_endian = unknown; then
- AC_MSG_ERROR([*** unable to determine endianness])
-elif test $ac_cv_c_compile_endian = big-endian; then
- AC_DEFINE(HOST_WORDS_BIG_ENDIAN, 1,
- [Define if the host machine stores words of multi-word integers in
- big-endian order.])
-fi
-])
-
-dnl Floating point format probe.
-dnl The basic concept is the same as the above: grep the object
-dnl file for an interesting string. We have to watch out for
-dnl rounding changing the values in the object, however; this is
-dnl handled by ignoring the least significant byte of the float.
-dnl
-dnl Does not know about VAX G-float or C4x idiosyncratic format.
-dnl It does know about PDP-10 idiosyncratic format, but this is
-dnl not presently supported by GCC. S/390 "binary floating point"
-dnl is in fact IEEE (but maybe we should have that in EBCDIC as well
-dnl as ASCII?)
-dnl
-AC_DEFUN([gcc_AC_C_FLOAT_FORMAT],
-[AC_CACHE_CHECK(floating point format, ac_cv_c_float_format,
-[gcc_AC_EXAMINE_OBJECT(
-[/* This will not work unless sizeof(double) == 8. */
-extern char sizeof_double_must_be_8 [sizeof(double) == 8 ? 1 : -1];
-
-/* This structure must have no internal padding. */
-struct possibility {
- char prefix[8];
- double candidate;
- char postfix[8];
-};