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 `getthrds', and to 0 if you
107 #undef HAVE_DECL_GETTHRDS
109 /* Define to 1 if you have the declaration of `ptrace', and to 0 if you don't.
111 #undef HAVE_DECL_PTRACE
113 /* Define to 1 if you have the declaration of `snprintf', and to 0 if you
115 #undef HAVE_DECL_SNPRINTF
117 /* Define to 1 if you have the declaration of `strerror', and to 0 if you
119 #undef HAVE_DECL_STRERROR
121 /* Define to 1 if you have the declaration of `strstr', and to 0 if you don't.
123 #undef HAVE_DECL_STRSTR
125 /* Define to 1 if you have the declaration of `strtol', and to 0 if you don't.
127 #undef HAVE_DECL_STRTOL
129 /* Define to 1 if you have the declaration of `strtoll', and to 0 if you
131 #undef HAVE_DECL_STRTOLL
133 /* Define to 1 if you have the declaration of `strtoul', and to 0 if you
135 #undef HAVE_DECL_STRTOUL
137 /* Define to 1 if you have the declaration of `strtoull', and to 0 if you
139 #undef HAVE_DECL_STRTOULL
141 /* Define to 1 if you have the declaration of `strverscmp', and to 0 if you
143 #undef HAVE_DECL_STRVERSCMP
145 /* Define to 1 if you have the declaration of `vasprintf', and to 0 if you
147 #undef HAVE_DECL_VASPRINTF
149 /* Define to 1 if you have the declaration of `vsnprintf', and to 0 if you
151 #undef HAVE_DECL_VSNPRINTF
153 /* Define to 1 if you have the <dlfcn.h> header file. */
156 /* Define if ELF support should be included. */
159 /* Define if <sys/procfs.h> has elf_fpregset_t. */
160 #undef HAVE_ELF_FPREGSET_T
162 /* Define to 1 if you have the <elf_hp.h> header file. */
165 /* Define to 1 if your system has the etext variable. */
168 /* Define to 1 if you have the `fdwalk' function. */
171 /* Define to 1 if you have the `fork' function. */
174 /* Define if <sys/procfs.h> has fpregset_t. */
175 #undef HAVE_FPREGSET_T
177 /* Define to 1 if you have the `getauxval' function. */
178 #undef HAVE_GETAUXVAL
180 /* Define to 1 if you have the `getgid' function. */
183 /* Define to 1 if you have the `getpagesize' function. */
184 #undef HAVE_GETPAGESIZE
186 /* Define to 1 if you have the `getpgid' function. */
189 /* Define to 1 if you have the `getrlimit' function. */
190 #undef HAVE_GETRLIMIT
192 /* Define to 1 if you have the `getrusage' function. */
193 #undef HAVE_GETRUSAGE
195 /* Define to 1 if you have the `getuid' function. */
198 /* Define if <sys/procfs.h> has gregset_t. */
199 #undef HAVE_GREGSET_T
201 /* Define if Guile interpreter is being linked in. */
204 /* Define if Guile supports manual finalization. */
205 #undef HAVE_GUILE_MANUAL_FINALIZATION
207 /* Define if you have the iconv() function. */
210 /* Define to 1 if you have the `iconvlist' function. */
211 #undef HAVE_ICONVLIST
213 /* Define to 1 if you have the <inttypes.h> header file. */
214 #undef HAVE_INTTYPES_H
216 /* Define to 1 if your system has the kinfo_getfile function. */
217 #undef HAVE_KINFO_GETFILE
219 /* Define to 1 if your system has the kinfo_getvmmap function. */
220 #undef HAVE_KINFO_GETVMMAP
222 /* Define if you have <langinfo.h> and nl_langinfo(CODESET). */
223 #undef HAVE_LANGINFO_CODESET
225 /* Define if your <locale.h> file defines LC_MESSAGES. */
226 #undef HAVE_LC_MESSAGES
228 /* Define if you have the babeltrace library. */
229 #undef HAVE_LIBBABELTRACE
231 /* Define if you have the expat library. */
234 /* Define to 1 if you have the `libiconvlist' function. */
235 #undef HAVE_LIBICONVLIST
237 /* Define if you have the ipt library. */
240 /* Define if you have the lzma library. */
243 /* Define to 1 if you have the `m' library (-lm). */
246 /* Define to 1 if you have the `mcheck' library (-lmcheck). */
247 #undef HAVE_LIBMCHECK
249 /* Define if you have the mpfr library. */
252 /* Define if Python 2.6 is being used. */
253 #undef HAVE_LIBPYTHON2_6
255 /* Define if Python 2.7 is being used. */
256 #undef HAVE_LIBPYTHON2_7
258 /* Define to 1 if you have the <libunwind-ia64.h> header file. */
259 #undef HAVE_LIBUNWIND_IA64_H
261 /* Define to 1 if you have the <linux/elf.h> header file. */
262 #undef HAVE_LINUX_ELF_H
264 /* Define to 1 if you have the <linux/perf_event.h> header file. */
265 #undef HAVE_LINUX_PERF_EVENT_H
267 /* Define to 1 if you have the <locale.h> header file. */
270 /* Define to 1 if the compiler supports long double. */
271 #undef HAVE_LONG_DOUBLE
273 /* Define to 1 if the system has the type `long long'. */
274 #undef HAVE_LONG_LONG
276 /* Define if <sys/procfs.h> has lwpid_t. */
279 /* Define to 1 if you have the <machine/reg.h> header file. */
280 #undef HAVE_MACHINE_REG_H
282 /* Define to 1 if you have the <memory.h> header file. */
285 /* Define to 1 if you have a working `mmap' system call. */
288 /* Define to 1 if you have the `monstartup' function. */
289 #undef HAVE_MONSTARTUP
291 /* Define to 1 if you have the <ncursesw/ncurses.h> header file. */
292 #undef HAVE_NCURSESW_NCURSES_H
294 /* Define to 1 if you have the <ncurses.h> header file. */
295 #undef HAVE_NCURSES_H
297 /* Define to 1 if you have the <ncurses/ncurses.h> header file. */
298 #undef HAVE_NCURSES_NCURSES_H
300 /* Define to 1 if you have the <ncurses/term.h> header file. */
301 #undef HAVE_NCURSES_TERM_H
303 /* Define to 1 if you have the <nlist.h> header file. */
306 /* Define if you support the personality syscall. */
307 #undef HAVE_PERSONALITY
309 /* Define to 1 if you have the `pipe' function. */
312 /* Define to 1 if you have the `pipe2' function. */
315 /* Define to 1 if you have the `poll' function. */
318 /* Define to 1 if you have the <poll.h> header file. */
321 /* Define to 1 if you have the `posix_madvise' function. */
322 #undef HAVE_POSIX_MADVISE
324 /* Define to 1 if you have the `pread' function. */
327 /* Define to 1 if you have the `pread64' function. */
330 /* Define if <sys/procfs.h> has prfpregset_t. */
331 #undef HAVE_PRFPREGSET_T
333 /* Define if <sys/procfs.h> has prgregset32_t. */
334 #undef HAVE_PRGREGSET32_T
336 /* Define if <sys/procfs.h> has prgregset_t. */
337 #undef HAVE_PRGREGSET_T
339 /* Define to 1 if you have the <proc_service.h> header file. */
340 #undef HAVE_PROC_SERVICE_H
342 /* Define if <sys/procfs.h> has psaddr_t. */
345 /* Define to 1 if you have the `ptrace64' function. */
348 /* Define if sys/ptrace.h defines the PTRACE_GETFPXREGS request. */
349 #undef HAVE_PTRACE_GETFPXREGS
351 /* Define if sys/ptrace.h defines the PTRACE_GETREGS request. */
352 #undef HAVE_PTRACE_GETREGS
354 /* Define to 1 if you have the <ptrace.h> header file. */
357 /* Define if sys/ptrace.h defines the PT_GETDBREGS request. */
358 #undef HAVE_PT_GETDBREGS
360 /* Define if sys/ptrace.h defines the PT_GETXMMREGS request. */
361 #undef HAVE_PT_GETXMMREGS
363 /* Define to 1 if you have the `pt_insn_event' function. */
364 #undef HAVE_PT_INSN_EVENT
366 /* Define to 1 if you have the `pwrite' function. */
369 /* Define if Python interpreter is being linked in. */
372 /* Define to 1 if you have the `resize_term' function. */
373 #undef HAVE_RESIZE_TERM
375 /* Define to 1 if you have the `sbrk' function. */
378 /* Define to 1 if you have the `scm_new_smob' function. */
379 #undef HAVE_SCM_NEW_SMOB
381 /* Define to 1 if you have the `setlocale' function. */
382 #undef HAVE_SETLOCALE
384 /* Define to 1 if you have the `setns' function. */
387 /* Define to 1 if you have the `setpgid' function. */
390 /* Define to 1 if you have the `setpgrp' function. */
393 /* Define to 1 if you have the `setrlimit' function. */
394 #undef HAVE_SETRLIMIT
396 /* Define to 1 if you have the `setsid' function. */
399 /* Define to 1 if you have the `sigaction' function. */
400 #undef HAVE_SIGACTION
402 /* Define to 1 if you have the `sigaltstack' function. */
403 #undef HAVE_SIGALTSTACK
405 /* Define to 1 if you have the <signal.h> header file. */
408 /* Define to 1 if you have the `sigprocmask' function. */
409 #undef HAVE_SIGPROCMASK
411 /* Define if sigsetjmp is available. */
412 #undef HAVE_SIGSETJMP
414 /* Define to 1 if you have the `sigsetmask' function. */
415 #undef HAVE_SIGSETMASK
417 /* Define to 1 if you have the `socketpair' function. */
418 #undef HAVE_SOCKETPAIR
420 /* Define to 1 if the system has the type `socklen_t'. */
421 #undef HAVE_SOCKLEN_T
423 /* Define to 1 if the source-highlight library is available */
424 #undef HAVE_SOURCE_HIGHLIGHT
426 /* Define to 1 if you have the <stdint.h> header file. */
429 /* Define to 1 if you have the <stdlib.h> header file. */
432 /* Define to 1 if you have the <strings.h> header file. */
433 #undef HAVE_STRINGS_H
435 /* Define to 1 if you have the <string.h> header file. */
438 /* Define to 1 if your system has struct lwp. */
439 #undef HAVE_STRUCT_LWP
441 /* Define to 1 if `pl_syscall_code' is a member of `struct ptrace_lwpinfo'. */
442 #undef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE
444 /* Define to 1 if `pl_tdname' is a member of `struct ptrace_lwpinfo'. */
445 #undef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME
447 /* Define to 1 if `enabled' is a member of `struct pt_insn'. */
448 #undef HAVE_STRUCT_PT_INSN_ENABLED
450 /* Define to 1 if `resynced' is a member of `struct pt_insn'. */
451 #undef HAVE_STRUCT_PT_INSN_RESYNCED
453 /* Define to 1 if your system has struct reg in <machine/reg.h>. */
454 #undef HAVE_STRUCT_REG
456 /* Define to 1 if `r_fs' is a member of `struct reg'. */
457 #undef HAVE_STRUCT_REG_R_FS
459 /* Define to 1 if `r_gs' is a member of `struct reg'. */
460 #undef HAVE_STRUCT_REG_R_GS
462 /* Define to 1 if `st_blksize' is a member of `struct stat'. */
463 #undef HAVE_STRUCT_STAT_ST_BLKSIZE
465 /* Define to 1 if `st_blocks' is a member of `struct stat'. */
466 #undef HAVE_STRUCT_STAT_ST_BLOCKS
468 /* Define to 1 if `td_pcb' is a member of `struct thread'. */
469 #undef HAVE_STRUCT_THREAD_TD_PCB
471 /* Define to 1 if `fs_base' is a member of `struct user_regs_struct'. */
472 #undef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
474 /* Define to 1 if `gs_base' is a member of `struct user_regs_struct'. */
475 #undef HAVE_STRUCT_USER_REGS_STRUCT_GS_BASE
477 /* Define to 1 if you have the <sys/debugreg.h> header file. */
478 #undef HAVE_SYS_DEBUGREG_H
480 /* Define to 1 if you have the <sys/file.h> header file. */
481 #undef HAVE_SYS_FILE_H
483 /* Define to 1 if you have the <sys/filio.h> header file. */
484 #undef HAVE_SYS_FILIO_H
486 /* Define to 1 if you have the <sys/ioctl.h> header file. */
487 #undef HAVE_SYS_IOCTL_H
489 /* Define to 1 if you have the <sys/param.h> header file. */
490 #undef HAVE_SYS_PARAM_H
492 /* Define to 1 if you have the <sys/poll.h> header file. */
493 #undef HAVE_SYS_POLL_H
495 /* Define to 1 if you have the <sys/procfs.h> header file. */
496 #undef HAVE_SYS_PROCFS_H
498 /* Define to 1 if you have the <sys/ptrace.h> header file. */
499 #undef HAVE_SYS_PTRACE_H
501 /* Define to 1 if you have the <sys/reg.h> header file. */
502 #undef HAVE_SYS_REG_H
504 /* Define to 1 if you have the <sys/resource.h> header file. */
505 #undef HAVE_SYS_RESOURCE_H
507 /* Define to 1 if you have the <sys/select.h> header file. */
508 #undef HAVE_SYS_SELECT_H
510 /* Define to 1 if you have the <sys/socket.h> header file. */
511 #undef HAVE_SYS_SOCKET_H
513 /* Define to 1 if you have the <sys/stat.h> header file. */
514 #undef HAVE_SYS_STAT_H
516 /* Define to 1 if you have the <sys/types.h> header file. */
517 #undef HAVE_SYS_TYPES_H
519 /* Define to 1 if you have the <sys/un.h> header file. */
522 /* Define to 1 if you have the <sys/user.h> header file. */
523 #undef HAVE_SYS_USER_H
525 /* Define to 1 if you have the <sys/wait.h> header file. */
526 #undef HAVE_SYS_WAIT_H
528 /* Define to 1 if you have the <termios.h> header file. */
529 #undef HAVE_TERMIOS_H
531 /* Define to 1 if you have the <term.h> header file. */
534 /* Define to 1 if you have the <thread_db.h> header file. */
535 #undef HAVE_THREAD_DB_H
537 /* Define to 1 if you have the `ttrace' function. */
540 /* Define to 1 if you have the <unistd.h> header file. */
543 /* Define to 1 if you have the `use_default_colors' function. */
544 #undef HAVE_USE_DEFAULT_COLORS
546 /* Define to 1 if you have the `vfork' function. */
549 /* Define to 1 if you have the <vfork.h> header file. */
552 /* Define to 1 if you have the `waitpid' function. */
555 /* Define to 1 if you have the <wait.h> header file. */
558 /* Define to 1 if you have the `wborder' function. */
561 /* Define to 1 if you have the <windows.h> header file. */
562 #undef HAVE_WINDOWS_H
564 /* Define to 1 if `fork' works. */
565 #undef HAVE_WORKING_FORK
567 /* Define to 1 if `vfork' works. */
568 #undef HAVE_WORKING_VFORK
570 /* Define to 1 if you have the `wresize' function. */
573 /* Define to 1 if you have the `XML_StopParser' function. */
574 #undef HAVE_XML_STOPPARSER
576 /* Define to 1 if your system has the _etext variable. */
579 /* Define to 1 if you have the `_mcleanup' function. */
580 #undef HAVE__MCLEANUP
582 /* Path of directory of iconv program. */
585 /* Define if the iconv directory should be relocated when GDB is moved. */
586 #undef ICONV_BIN_RELOCATABLE
588 /* Define as const if the declaration of iconv() needs const. */
591 /* directory to load the JIT readers from */
592 #undef JIT_READER_DIR
594 /* Define if the jit-reader-dir directory should be relocated when GDB is
596 #undef JIT_READER_DIR_RELOCATABLE
598 /* Name of this package. */
601 /* Define to the address where bug reports for this package should be sent. */
602 #undef PACKAGE_BUGREPORT
604 /* Define to the full name of this package. */
607 /* Define to the full name and version of this package. */
608 #undef PACKAGE_STRING
610 /* Define to the one symbol short name of this package. */
611 #undef PACKAGE_TARNAME
613 /* Define to the home page for this package. */
616 /* Define to the version of this package. */
617 #undef PACKAGE_VERSION
619 /* Additional package description */
622 /* Define to 1 if the "%H, %D and %DD" formats work to print decfloats. */
623 #undef PRINTF_HAS_DECFLOAT
625 /* Define to 1 if the "%Lg" format works to print long doubles. */
626 #undef PRINTF_HAS_LONG_DOUBLE
628 /* Define to 1 if the "%ll" format works to print long longs. */
629 #undef PRINTF_HAS_LONG_LONG
631 /* Define to the type of arg 1 for ptrace. */
632 #undef PTRACE_TYPE_ARG1
634 /* Define to the type of arg 3 for ptrace. */
635 #undef PTRACE_TYPE_ARG3
637 /* Define to the type of arg 4 for ptrace. */
638 #undef PTRACE_TYPE_ARG4
640 /* Define to the type of arg 5 for ptrace. */
641 #undef PTRACE_TYPE_ARG5
643 /* Define as the return type of ptrace. */
644 #undef PTRACE_TYPE_RET
646 /* Define if the python directory should be relocated when GDB is moved. */
647 #undef PYTHON_PATH_RELOCATABLE
649 /* Relocated directory for source files. */
652 /* Bug reporting address */
653 #undef REPORT_BUGS_TO
655 /* Define to 1 if the "%Lg" format works to scan long doubles. */
656 #undef SCANF_HAS_LONG_DOUBLE
658 /* Define to 1 if the `setpgrp' function takes no argument. */
661 /* The size of `long', as computed by sizeof. */
664 /* The size of `long long', as computed by sizeof. */
665 #undef SIZEOF_LONG_LONG
667 /* The size of `unsigned long', as computed by sizeof. */
668 #undef SIZEOF_UNSIGNED_LONG
670 /* The size of `unsigned long long', as computed by sizeof. */
671 #undef SIZEOF_UNSIGNED_LONG_LONG
673 /* The size of `unsigned __int128', as computed by sizeof. */
674 #undef SIZEOF_UNSIGNED___INT128
676 /* If using the C implementation of alloca, define if you know the
677 direction of stack growth for your system; otherwise it will be
678 automatically deduced at runtime.
679 STACK_DIRECTION > 0 => grows toward higher addresses
680 STACK_DIRECTION < 0 => grows toward lower addresses
681 STACK_DIRECTION = 0 => direction of growth unknown */
682 #undef STACK_DIRECTION
684 /* Define to 1 if you have the ANSI C header files. */
687 /* automatically load a system-wide gdbinit file */
688 #undef SYSTEM_GDBINIT
690 /* Define if the system-gdbinit directory should be relocated when GDB is
692 #undef SYSTEM_GDBINIT_RELOCATABLE
694 /* search for usr/lib et al within DIR */
695 #undef TARGET_SYSTEM_ROOT
697 /* Define if the sysroot directory should be relocated when GDB is moved. */
698 #undef TARGET_SYSTEM_ROOT_RELOCATABLE
700 /* Define if <thread_db.h> has the TD_NOTALLOC error code. */
701 #undef THREAD_DB_HAS_TD_NOTALLOC
703 /* Define if <thread_db.h> has the TD_NOTLS error code. */
704 #undef THREAD_DB_HAS_TD_NOTLS
706 /* Define if <thread_db.h> has the TD_VERSION error code. */
707 #undef THREAD_DB_HAS_TD_VERSION
709 /* Define to 1 if the regex included in libiberty should be used. */
710 #undef USE_INCLUDED_REGEX
712 /* Enable extensions on AIX 3, Interix. */
716 /* Enable GNU extensions on systems that have them. */
720 /* Enable threading extensions on Solaris. */
721 #ifndef _POSIX_PTHREAD_SEMANTICS
722 # undef _POSIX_PTHREAD_SEMANTICS
724 /* Enable extensions on HP NonStop. */
725 #ifndef _TANDEM_SOURCE
726 # undef _TANDEM_SOURCE
728 /* Enable general extensions on Solaris. */
729 #ifndef __EXTENSIONS__
730 # undef __EXTENSIONS__
734 /* Define if we should use the Windows API, instead of the POSIX API. On
735 Windows, we use the Windows API when building for MinGW, but the POSIX API
736 when building for Cygwin. */
739 /* Define if the PPC simulator is being linked in. */
742 /* Define if --with-python provides a path, either directly or via
743 python-config.py --exec-prefix. */
744 #undef WITH_PYTHON_PATH
746 /* Define if the simulator is being linked in. */
749 /* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most
750 significant byte first (like Motorola and SPARC, unlike Intel). */
751 #if defined AC_APPLE_UNIVERSAL_BUILD
752 # if defined __BIG_ENDIAN__
753 # define WORDS_BIGENDIAN 1
756 # ifndef WORDS_BIGENDIAN
757 # undef WORDS_BIGENDIAN
761 /* Enable large inode numbers on Mac OS X 10.5. */
762 #ifndef _DARWIN_USE_64_BIT_INODE
763 # define _DARWIN_USE_64_BIT_INODE 1
766 /* Number of bits in a file offset, on hosts where this is settable. */
767 #undef _FILE_OFFSET_BITS
769 /* Define for large files, on AIX-style hosts. */
772 /* Define to 1 if on MINIX. */
775 /* Define to 2 if the system does not provide POSIX.1 features except with
777 #undef _POSIX_1_SOURCE
779 /* Define to 1 if you need to in order for `stat' and other things to work. */
782 /* Define to empty if `const' does not conform to ANSI C. */
785 /* Define to `__inline__' or `__inline' if that's what the C compiler
786 calls it, or to nothing if 'inline' is not supported under any name. */
791 /* Define to `int' if <sys/types.h> does not define. */
794 /* Define to `unsigned int' if <sys/types.h> does not define. */
797 /* Define as `fork' if `vfork' does not work. */