1 /* config.in. Generated from configure.ac by autoheader. */
3 /* Define if building universal (internal helper macro) */
4 #undef AC_APPLE_UNIVERSAL_BUILD
6 /* Directories from which to load auto-loaded scripts. */
9 /* Directories safe to hold auto-loaded files. */
10 #undef AUTO_LOAD_SAFE_PATH
12 /* Directory of programs. */
15 /* Define to one of `_getb67', `GETB67', `getb67' for Cray-2 and Cray-YMP
16 systems. This function is required for `alloca.c' support on those systems.
18 #undef CRAY_STACKSEG_END
20 /* Define to 1 if using `alloca.c'. */
23 /* look for global separate debug info in this path [LIBDIR/debug] */
26 /* Define if the separate-debug-dir directory should be relocated when GDB is
28 #undef DEBUGDIR_RELOCATABLE
30 /* Define to BFD's default architecture. */
31 #undef DEFAULT_BFD_ARCH
33 /* Define to BFD's default target vector. */
34 #undef DEFAULT_BFD_VEC
36 /* Define to 1 if translation of program messages to the user's native
37 language is requested. */
40 /* The .gdbinit filename. */
43 /* look for global separate data files in this path [DATADIR/gdb] */
46 /* Define if the gdb-datadir directory should be relocated when GDB is moved.
48 #undef GDB_DATADIR_RELOCATABLE
50 /* Define to be a string naming the default host character set. */
51 #undef GDB_DEFAULT_HOST_CHARSET
53 /* Host double floatformat */
54 #undef GDB_HOST_DOUBLE_FORMAT
56 /* Host float floatformat */
57 #undef GDB_HOST_FLOAT_FORMAT
59 /* Host long double floatformat */
60 #undef GDB_HOST_LONG_DOUBLE_FORMAT
65 /* Define to the default OS ABI for this configuration. */
66 #undef GDB_OSABI_DEFAULT
68 /* Define if self-testing features should be enabled */
71 /* Define to 1 if you have `alloca', as a function or macro. */
74 /* Define to 1 if you have <alloca.h> and it should be used (not on Ultrix).
78 /* Define to 1 if you have the `btowc' function. */
81 /* Define to 1 if you have the <cursesX.h> header file. */
84 /* Define to 1 if you have the <curses.h> header file. */
87 /* define if the compiler supports basic C++11 syntax */
90 /* Define to 1 if you have the declaration of `ADDR_NO_RANDOMIZE', and to 0 if
92 #undef HAVE_DECL_ADDR_NO_RANDOMIZE
94 /* Define to 1 if you have the declaration of `asprintf', and to 0 if you
96 #undef HAVE_DECL_ASPRINTF
98 /* Define to 1 if you have the declaration of `basename(char *)', and to 0 if
100 #undef HAVE_DECL_BASENAME
102 /* Define to 1 if you have the declaration of `ffs', and to 0 if you don't. */
105 /* Define to 1 if you have the declaration of `free', and to 0 if you don't.
107 #undef HAVE_DECL_FREE
109 /* Define to 1 if you have the declaration of `getthrds', and to 0 if you
111 #undef HAVE_DECL_GETTHRDS
113 /* Define to 1 if you have the declaration of `malloc', and to 0 if you don't.
115 #undef HAVE_DECL_MALLOC
117 /* Define to 1 if you have the declaration of `ptrace', and to 0 if you don't.
119 #undef HAVE_DECL_PTRACE
121 /* Define to 1 if you have the declaration of `realloc', and to 0 if you
123 #undef HAVE_DECL_REALLOC
125 /* Define to 1 if you have the declaration of `snprintf', and to 0 if you
127 #undef HAVE_DECL_SNPRINTF
129 /* Define to 1 if you have the declaration of `strerror', and to 0 if you
131 #undef HAVE_DECL_STRERROR
133 /* Define to 1 if you have the declaration of `strstr', and to 0 if you don't.
135 #undef HAVE_DECL_STRSTR
137 /* Define to 1 if you have the declaration of `strtol', and to 0 if you don't.
139 #undef HAVE_DECL_STRTOL
141 /* Define to 1 if you have the declaration of `strtoll', and to 0 if you
143 #undef HAVE_DECL_STRTOLL
145 /* Define to 1 if you have the declaration of `strtoul', and to 0 if you
147 #undef HAVE_DECL_STRTOUL
149 /* Define to 1 if you have the declaration of `strtoull', and to 0 if you
151 #undef HAVE_DECL_STRTOULL
153 /* Define to 1 if you have the declaration of `strverscmp', and to 0 if you
155 #undef HAVE_DECL_STRVERSCMP
157 /* Define to 1 if you have the declaration of `vasprintf', and to 0 if you
159 #undef HAVE_DECL_VASPRINTF
161 /* Define to 1 if you have the declaration of `vsnprintf', and to 0 if you
163 #undef HAVE_DECL_VSNPRINTF
165 /* Define to 1 if you have the <dlfcn.h> header file. */
168 /* Define if ELF support should be included. */
171 /* Define to 1 if you have the <elf_hp.h> header file. */
174 /* Define to 1 if your system has the etext variable. */
177 /* Define to 1 if you have the `fdwalk' function. */
180 /* Define to 1 if you have the `fork' function. */
183 /* Define if <sys/procfs.h> has fpregset_t. */
184 #undef HAVE_FPREGSET_T
186 /* Define to 1 if you have the `getauxval' function. */
187 #undef HAVE_GETAUXVAL
189 /* Define to 1 if you have the `getgid' function. */
192 /* Define to 1 if you have the `getpagesize' function. */
193 #undef HAVE_GETPAGESIZE
195 /* Define to 1 if you have the `getpgid' function. */
198 /* Define to 1 if you have the `getrlimit' function. */
199 #undef HAVE_GETRLIMIT
201 /* Define to 1 if you have the `getrusage' function. */
202 #undef HAVE_GETRUSAGE
204 /* Define to 1 if you have the `getuid' function. */
207 /* Define if <sys/procfs.h> has gregset_t. */
208 #undef HAVE_GREGSET_T
210 /* Define if Guile interpreter is being linked in. */
213 /* Define if Guile supports manual finalization. */
214 #undef HAVE_GUILE_MANUAL_FINALIZATION
216 /* Define if you have the iconv() function. */
219 /* Define to 1 if you have the `iconvlist' function. */
220 #undef HAVE_ICONVLIST
222 /* Define to 1 if you have the <inttypes.h> header file. */
223 #undef HAVE_INTTYPES_H
225 /* Define to 1 if your system has the kinfo_getfile function. */
226 #undef HAVE_KINFO_GETFILE
228 /* Define to 1 if your system has the kinfo_getvmmap function. */
229 #undef HAVE_KINFO_GETVMMAP
231 /* Define if you have <langinfo.h> and nl_langinfo(CODESET). */
232 #undef HAVE_LANGINFO_CODESET
234 /* Define if your <locale.h> file defines LC_MESSAGES. */
235 #undef HAVE_LC_MESSAGES
237 /* Define if you have the babeltrace library. */
238 #undef HAVE_LIBBABELTRACE
240 /* Define if you have the expat library. */
243 /* Define to 1 if you have the `libiconvlist' function. */
244 #undef HAVE_LIBICONVLIST
246 /* Define if you have the ipt library. */
249 /* Define if you have the lzma library. */
252 /* Define to 1 if you have the `m' library (-lm). */
255 /* Define to 1 if you have the `mcheck' library (-lmcheck). */
256 #undef HAVE_LIBMCHECK
258 /* Define if you have the mpfr library. */
261 /* Define if Python 2.4 is being used. */
262 #undef HAVE_LIBPYTHON2_4
264 /* Define if Python 2.5 is being used. */
265 #undef HAVE_LIBPYTHON2_5
267 /* Define if Python 2.6 is being used. */
268 #undef HAVE_LIBPYTHON2_6
270 /* Define if Python 2.7 is being used. */
271 #undef HAVE_LIBPYTHON2_7
273 /* Define to 1 if you have the <libunwind-ia64.h> header file. */
274 #undef HAVE_LIBUNWIND_IA64_H
276 /* Define to 1 if you have the <linux/perf_event.h> header file. */
277 #undef HAVE_LINUX_PERF_EVENT_H
279 /* Define to 1 if you have the <locale.h> header file. */
282 /* Define to 1 if the compiler supports long double. */
283 #undef HAVE_LONG_DOUBLE
285 /* Define to 1 if the system has the type `long long'. */
286 #undef HAVE_LONG_LONG
288 /* Define if <sys/procfs.h> has lwpid_t. */
291 /* Define to 1 if you have the <machine/reg.h> header file. */
292 #undef HAVE_MACHINE_REG_H
294 /* Define to 1 if you have the <memory.h> header file. */
297 /* Define to 1 if you have the `mkdtemp' function. */
300 /* Define to 1 if you have a working `mmap' system call. */
303 /* Define to 1 if you have the `monstartup' function. */
304 #undef HAVE_MONSTARTUP
306 /* Define to 1 if you have the <ncursesw/ncurses.h> header file. */
307 #undef HAVE_NCURSESW_NCURSES_H
309 /* Define to 1 if you have the <ncurses.h> header file. */
310 #undef HAVE_NCURSES_H
312 /* Define to 1 if you have the <ncurses/ncurses.h> header file. */
313 #undef HAVE_NCURSES_NCURSES_H
315 /* Define to 1 if you have the <ncurses/term.h> header file. */
316 #undef HAVE_NCURSES_TERM_H
318 /* Define to 1 if you have the <nlist.h> header file. */
321 /* Define if you support the personality syscall. */
322 #undef HAVE_PERSONALITY
324 /* Define to 1 if you have the `pipe' function. */
327 /* Define to 1 if you have the `pipe2' function. */
330 /* Define to 1 if you have the `poll' function. */
333 /* Define to 1 if you have the <poll.h> header file. */
336 /* Define to 1 if you have the `posix_madvise' function. */
337 #undef HAVE_POSIX_MADVISE
339 /* Define to 1 if you have the `pread' function. */
342 /* Define to 1 if you have the `pread64' function. */
345 /* Define if <sys/procfs.h> has prfpregset_t. */
346 #undef HAVE_PRFPREGSET_T
348 /* Define if <sys/procfs.h> has prgregset32_t. */
349 #undef HAVE_PRGREGSET32_T
351 /* Define if <sys/procfs.h> has prgregset_t. */
352 #undef HAVE_PRGREGSET_T
354 /* Define to 1 if you have the <proc_service.h> header file. */
355 #undef HAVE_PROC_SERVICE_H
357 /* Define if <sys/procfs.h> has psaddr_t. */
360 /* Define to 1 if you have the `ptrace64' function. */
363 /* Define if sys/ptrace.h defines the PTRACE_GETFPXREGS request. */
364 #undef HAVE_PTRACE_GETFPXREGS
366 /* Define if sys/ptrace.h defines the PTRACE_GETREGS request. */
367 #undef HAVE_PTRACE_GETREGS
369 /* Define to 1 if you have the <ptrace.h> header file. */
372 /* Define if sys/ptrace.h defines the PT_GETDBREGS request. */
373 #undef HAVE_PT_GETDBREGS
375 /* Define if sys/ptrace.h defines the PT_GETXMMREGS request. */
376 #undef HAVE_PT_GETXMMREGS
378 /* Define to 1 if you have the `pt_insn_event' function. */
379 #undef HAVE_PT_INSN_EVENT
381 /* Define to 1 if you have the `pwrite' function. */
384 /* Define if Python interpreter is being linked in. */
387 /* Define to 1 if you have the `resize_term' function. */
388 #undef HAVE_RESIZE_TERM
390 /* Define to 1 if you have the `sbrk' function. */
393 /* Define to 1 if you have the `scm_new_smob' function. */
394 #undef HAVE_SCM_NEW_SMOB
396 /* Define to 1 if you have the `setlocale' function. */
397 #undef HAVE_SETLOCALE
399 /* Define to 1 if you have the `setns' function. */
402 /* Define to 1 if you have the `setpgid' function. */
405 /* Define to 1 if you have the `setpgrp' function. */
408 /* Define to 1 if you have the `setrlimit' function. */
409 #undef HAVE_SETRLIMIT
411 /* Define to 1 if you have the `setsid' function. */
414 /* Define to 1 if you have the `sigaction' function. */
415 #undef HAVE_SIGACTION
417 /* Define to 1 if you have the `sigaltstack' function. */
418 #undef HAVE_SIGALTSTACK
420 /* Define to 1 if you have the <signal.h> header file. */
423 /* Define to 1 if you have the `sigprocmask' function. */
424 #undef HAVE_SIGPROCMASK
426 /* Define if sigsetjmp is available. */
427 #undef HAVE_SIGSETJMP
429 /* Define to 1 if you have the `sigsetmask' function. */
430 #undef HAVE_SIGSETMASK
432 /* Define to 1 if you have the `socketpair' function. */
433 #undef HAVE_SOCKETPAIR
435 /* Define to 1 if the system has the type `socklen_t'. */
436 #undef HAVE_SOCKLEN_T
438 /* Define to 1 if you have the <stdint.h> header file. */
441 /* Define to 1 if you have the <stdlib.h> header file. */
444 /* Define to 1 if you have the <strings.h> header file. */
445 #undef HAVE_STRINGS_H
447 /* Define to 1 if you have the <string.h> header file. */
450 /* Define to 1 if your system has struct lwp. */
451 #undef HAVE_STRUCT_LWP
453 /* Define to 1 if `struct ptrace_lwpinfo' is a member of `pl_syscall_code'. */
454 #undef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE
456 /* Define to 1 if `struct ptrace_lwpinfo' is a member of `pl_tdname'. */
457 #undef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME
459 /* Define to 1 if `struct pt_insn' is a member of `enabled'. */
460 #undef HAVE_STRUCT_PT_INSN_ENABLED
462 /* Define to 1 if `struct pt_insn' is a member of `resynced'. */
463 #undef HAVE_STRUCT_PT_INSN_RESYNCED
465 /* Define to 1 if your system has struct reg in <machine/reg.h>. */
466 #undef HAVE_STRUCT_REG
468 /* Define to 1 if `struct reg' is a member of `r_fs'. */
469 #undef HAVE_STRUCT_REG_R_FS
471 /* Define to 1 if `struct reg' is a member of `r_gs'. */
472 #undef HAVE_STRUCT_REG_R_GS
474 /* Define to 1 if `struct stat' is a member of `st_blksize'. */
475 #undef HAVE_STRUCT_STAT_ST_BLKSIZE
477 /* Define to 1 if `struct stat' is a member of `st_blocks'. */
478 #undef HAVE_STRUCT_STAT_ST_BLOCKS
480 /* Define to 1 if `struct thread' is a member of `td_pcb'. */
481 #undef HAVE_STRUCT_THREAD_TD_PCB
483 /* Define to 1 if `struct user_regs_struct' is a member of `fs_base'. */
484 #undef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
486 /* Define to 1 if `struct user_regs_struct' is a member of `gs_base'. */
487 #undef HAVE_STRUCT_USER_REGS_STRUCT_GS_BASE
489 /* Define to 1 if you have the <sys/debugreg.h> header file. */
490 #undef HAVE_SYS_DEBUGREG_H
492 /* Define to 1 if you have the <sys/file.h> header file. */
493 #undef HAVE_SYS_FILE_H
495 /* Define to 1 if you have the <sys/filio.h> header file. */
496 #undef HAVE_SYS_FILIO_H
498 /* Define to 1 if you have the <sys/ioctl.h> header file. */
499 #undef HAVE_SYS_IOCTL_H
501 /* Define to 1 if you have the <sys/param.h> header file. */
502 #undef HAVE_SYS_PARAM_H
504 /* Define to 1 if you have the <sys/poll.h> header file. */
505 #undef HAVE_SYS_POLL_H
507 /* Define to 1 if you have the <sys/procfs.h> header file. */
508 #undef HAVE_SYS_PROCFS_H
510 /* Define to 1 if you have the <sys/ptrace.h> header file. */
511 #undef HAVE_SYS_PTRACE_H
513 /* Define to 1 if you have the <sys/reg.h> header file. */
514 #undef HAVE_SYS_REG_H
516 /* Define to 1 if you have the <sys/resource.h> header file. */
517 #undef HAVE_SYS_RESOURCE_H
519 /* Define to 1 if you have the <sys/select.h> header file. */
520 #undef HAVE_SYS_SELECT_H
522 /* Define to 1 if you have the <sys/socket.h> header file. */
523 #undef HAVE_SYS_SOCKET_H
525 /* Define to 1 if you have the <sys/stat.h> header file. */
526 #undef HAVE_SYS_STAT_H
528 /* Define to 1 if you have the <sys/types.h> header file. */
529 #undef HAVE_SYS_TYPES_H
531 /* Define to 1 if you have the <sys/un.h> header file. */
534 /* Define to 1 if you have the <sys/user.h> header file. */
535 #undef HAVE_SYS_USER_H
537 /* Define to 1 if you have the <sys/wait.h> header file. */
538 #undef HAVE_SYS_WAIT_H
540 /* Define to 1 if you have the <termios.h> header file. */
541 #undef HAVE_TERMIOS_H
543 /* Define to 1 if you have the <term.h> header file. */
546 /* Define to 1 if you have the <thread_db.h> header file. */
547 #undef HAVE_THREAD_DB_H
549 /* Define to 1 if you have the `ttrace' function. */
552 /* Define to 1 if you have the <unistd.h> header file. */
555 /* Define to 1 if you have the `vfork' function. */
558 /* Define to 1 if you have the <vfork.h> header file. */
561 /* Define to 1 if you have the `waitpid' function. */
564 /* Define to 1 if you have the <wait.h> header file. */
567 /* Define to 1 if you have the `wborder' function. */
570 /* Define to 1 if you have the <windows.h> header file. */
571 #undef HAVE_WINDOWS_H
573 /* Define to 1 if `fork' works. */
574 #undef HAVE_WORKING_FORK
576 /* Define to 1 if `vfork' works. */
577 #undef HAVE_WORKING_VFORK
579 /* Define to 1 if you have the `wresize' function. */
582 /* Define to 1 if you have the `XML_StopParser' function. */
583 #undef HAVE_XML_STOPPARSER
585 /* Define to 1 if your system has the _etext variable. */
588 /* Define to 1 if you have the `_mcleanup' function. */
589 #undef HAVE__MCLEANUP
591 /* Path of directory of iconv program. */
594 /* Define if the iconv directory should be relocated when GDB is moved. */
595 #undef ICONV_BIN_RELOCATABLE
597 /* Define as const if the declaration of iconv() needs const. */
600 /* directory to load the JIT readers from */
601 #undef JIT_READER_DIR
603 /* Define if the jit-reader-dir directory should be relocated when GDB is
605 #undef JIT_READER_DIR_RELOCATABLE
607 /* Name of this package. */
610 /* Define to the address where bug reports for this package should be sent. */
611 #undef PACKAGE_BUGREPORT
613 /* Define to the full name of this package. */
616 /* Define to the full name and version of this package. */
617 #undef PACKAGE_STRING
619 /* Define to the one symbol short name of this package. */
620 #undef PACKAGE_TARNAME
622 /* Define to the home page for this package. */
625 /* Define to the version of this package. */
626 #undef PACKAGE_VERSION
628 /* Additional package description */
631 /* Define if the prfpregset_t type is broken. */
632 #undef PRFPREGSET_T_BROKEN
634 /* Define to 1 if the "%H, %D and %DD" formats work to print decfloats. */
635 #undef PRINTF_HAS_DECFLOAT
637 /* Define to 1 if the "%Lg" format works to print long doubles. */
638 #undef PRINTF_HAS_LONG_DOUBLE
640 /* Define to 1 if the "%ll" format works to print long longs. */
641 #undef PRINTF_HAS_LONG_LONG
643 /* Define to the type of arg 1 for ptrace. */
644 #undef PTRACE_TYPE_ARG1
646 /* Define to the type of arg 3 for ptrace. */
647 #undef PTRACE_TYPE_ARG3
649 /* Define to the type of arg 4 for ptrace. */
650 #undef PTRACE_TYPE_ARG4
652 /* Define to the type of arg 5 for ptrace. */
653 #undef PTRACE_TYPE_ARG5
655 /* Define as the return type of ptrace. */
656 #undef PTRACE_TYPE_RET
658 /* Define if the python directory should be relocated when GDB is moved. */
659 #undef PYTHON_PATH_RELOCATABLE
661 /* Relocated directory for source files. */
664 /* Bug reporting address */
665 #undef REPORT_BUGS_TO
667 /* Define to 1 if the "%Lg" format works to scan long doubles. */
668 #undef SCANF_HAS_LONG_DOUBLE
670 /* Define to 1 if the `setpgrp' function takes no argument. */
673 /* The size of `long', as computed by sizeof. */
676 /* The size of `long long', as computed by sizeof. */
677 #undef SIZEOF_LONG_LONG
679 /* The size of `unsigned long', as computed by sizeof. */
680 #undef SIZEOF_UNSIGNED_LONG
682 /* The size of `unsigned long long', as computed by sizeof. */
683 #undef SIZEOF_UNSIGNED_LONG_LONG
685 /* The size of `unsigned __int128', as computed by sizeof. */
686 #undef SIZEOF_UNSIGNED___INT128
688 /* If using the C implementation of alloca, define if you know the
689 direction of stack growth for your system; otherwise it will be
690 automatically deduced at runtime.
691 STACK_DIRECTION > 0 => grows toward higher addresses
692 STACK_DIRECTION < 0 => grows toward lower addresses
693 STACK_DIRECTION = 0 => direction of growth unknown */
694 #undef STACK_DIRECTION
696 /* Define to 1 if you have the ANSI C header files. */
699 /* automatically load a system-wide gdbinit file */
700 #undef SYSTEM_GDBINIT
702 /* Define if the system-gdbinit directory should be relocated when GDB is
704 #undef SYSTEM_GDBINIT_RELOCATABLE
706 /* search for usr/lib et al within DIR */
707 #undef TARGET_SYSTEM_ROOT
709 /* Define if the sysroot directory should be relocated when GDB is moved. */
710 #undef TARGET_SYSTEM_ROOT_RELOCATABLE
712 /* Define if <thread_db.h> has the TD_NOTALLOC error code. */
713 #undef THREAD_DB_HAS_TD_NOTALLOC
715 /* Define if <thread_db.h> has the TD_NOTLS error code. */
716 #undef THREAD_DB_HAS_TD_NOTLS
718 /* Define if <thread_db.h> has the TD_VERSION error code. */
719 #undef THREAD_DB_HAS_TD_VERSION
721 /* Define to 1 if the regex included in libiberty should be used. */
722 #undef USE_INCLUDED_REGEX
724 /* Enable extensions on AIX 3, Interix. */
728 /* Enable GNU extensions on systems that have them. */
732 /* Enable threading extensions on Solaris. */
733 #ifndef _POSIX_PTHREAD_SEMANTICS
734 # undef _POSIX_PTHREAD_SEMANTICS
736 /* Enable extensions on HP NonStop. */
737 #ifndef _TANDEM_SOURCE
738 # undef _TANDEM_SOURCE
740 /* Enable general extensions on Solaris. */
741 #ifndef __EXTENSIONS__
742 # undef __EXTENSIONS__
746 /* Define if we should use the Windows API, instead of the POSIX API. On
747 Windows, we use the Windows API when building for MinGW, but the POSIX API
748 when building for Cygwin. */
751 /* Define if the PPC simulator is being linked in. */
754 /* Define if --with-python provides a path, either directly or via
755 python-config.py --exec-prefix. */
756 #undef WITH_PYTHON_PATH
758 /* Define if the simulator is being linked in. */
761 /* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most
762 significant byte first (like Motorola and SPARC, unlike Intel). */
763 #if defined AC_APPLE_UNIVERSAL_BUILD
764 # if defined __BIG_ENDIAN__
765 # define WORDS_BIGENDIAN 1
768 # ifndef WORDS_BIGENDIAN
769 # undef WORDS_BIGENDIAN
773 /* Number of bits in a file offset, on hosts where this is settable. */
774 #undef _FILE_OFFSET_BITS
776 /* Define for large files, on AIX-style hosts. */
779 /* Define to 1 if on MINIX. */
782 /* Define to 2 if the system does not provide POSIX.1 features except with
784 #undef _POSIX_1_SOURCE
786 /* Define to 1 if you need to in order for `stat' and other things to work. */
789 /* Define to empty if `const' does not conform to ANSI C. */
792 /* Define to `__inline__' or `__inline' if that's what the C compiler
793 calls it, or to nothing if 'inline' is not supported under any name. */
798 /* Define to `int' if <sys/types.h> does not define. */
801 /* Define as `fork' if `vfork' does not work. */