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binutils-gdb/gdb/config.in
Tom de Vries ff50752029 [gdb/build] Hardcode --with-included-regex 
Currently gdb has a configure option:
...
$ ./src/gdb/configure --help
  ...
  --without-included-regex
                          don't use included regex; this is the default on
                          systems with version 2 of the GNU C library (use
                          with caution on other system)
...

The configure option controls config.h macro USE_INCLUDED_REGEX, which is
used in gdb/gdb_regex.h to choose between:
- using regex from libiberty (which is included in the binutils-gdb.git repo,
  hence the 'included' in USE_INCLUDED_REGEX), or
- using regex.h.

In the former case, the symbol regcomp is remapped to a symbol xregcomp, which
is then provided by libiberty.

In the latter case, the symbol regcomp is resolved at runtime, usually binding
to libc.  However, there is no mechanism in place to enforce this.

PR27681 is an example of where that causes problems.  On openSUSE Tumbleweed,
the ncurses package got the --with-pcre2 configure switch enabled, and solved
the resulting dependencies using:
...
 $ cat /usr/lib64/libncursesw.so
 /* GNU ld script */
-INPUT(/lib64/libncursesw.so.6 AS_NEEDED(-ltinfo -ldl))
+INPUT(/lib64/libncursesw.so.6 AS_NEEDED(-ltinfo -ldl -lpcre2-posix -lpcre2-8))
...

This lead to regcomp being bound to libpcre2-posix instead of libc.

This causes problems in several ways:
- by compiling using regex.h, we've already chosen a specific regex_t
  implementation, and the one from pcre2-posix is not the same.
- in gdb_regex.c we use GNU regex function re_search, which pcre2-posix
  doesn't provide, so while regcomp binds to pcre2-posix, re_search binds to
  libc.

A note on the latter: it's actually a bug to compile a regex using regcomp and
then pass it to re_search.  The GNU regex interface requires one to use
re_compile_pattern or re_compile_fastmap.  But as long we're using one of the
GNU regex incarnations in gnulib, glibc or libiberty, we get away with this.

The PR could be fixed by adding -lc in a specific position in the link line,
to force regcomp to be bound to glibc.  But this solution was considered
in the discussion in the PR as being brittle, and possibly causing problems
elsewhere.

Another solution offered was to restrict regex usage to posix, and no longer
use the GNU regex API.  This however could mean having to reproduce some of
that functionality locally, which would mean maintaining the same
functionality in more than one place.

The solution chosen here, is to hardcode --with-included-regex, that is, using
libiberty.

The option of using glibc for regex was introduced because glibc became the
authorative source for GNU regex, so it offered the possibility to link
against a more up-to-date regex version.

In that aspect, this patch is a step back.  But we have the option of using a
more up-to-date regex version as a follow-up step: by using the regex from
gnulib.

Tested on x86_64-linux.

gdb/ChangeLog:

2021-04-21  Tom de Vries  <tdevries@suse.de>

	PR build/27681
	* configure.ac: Remove --without-included-regex/--with-included-regex.
	* config.in: Regenerate.
	* configure: Regenerate.
	* gdb_regex.h: Assume USE_INCLUDED_REGEX is defined.
2021-04-21 21:54:03 +02:00

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/* config.in. Generated from configure.ac by autoheader. */
/* Define if building universal (internal helper macro) */
#undef AC_APPLE_UNIVERSAL_BUILD
/* Directories from which to load auto-loaded scripts. */
#undef AUTO_LOAD_DIR
/* Directories safe to hold auto-loaded files. */
#undef AUTO_LOAD_SAFE_PATH
/* Directory of programs. */
#undef BINDIR
/* Define to one of `_getb67', `GETB67', `getb67' for Cray-2 and Cray-YMP
systems. This function is required for `alloca.c' support on those systems.
*/
#undef CRAY_STACKSEG_END
/* Define to 1 if std::thread works. */
#undef CXX_STD_THREAD
/* Define to 1 if using `alloca.c'. */
#undef C_ALLOCA
/* look for global separate debug info in this path [LIBDIR/debug] */
#undef DEBUGDIR
/* Define if the separate-debug-dir directory should be relocated when GDB is
moved. */
#undef DEBUGDIR_RELOCATABLE
/* Define to BFD's default architecture. */
#undef DEFAULT_BFD_ARCH
/* Define to BFD's default target vector. */
#undef DEFAULT_BFD_VEC
/* Handle .ctf type-info sections */
#undef ENABLE_LIBCTF
/* Define to 1 if translation of program messages to the user's native
language is requested. */
#undef ENABLE_NLS
/* The .gdbearlyinit filename. */
#undef GDBEARLYINIT
/* The .gdbinit filename. */
#undef GDBINIT
/* look for global separate data files in this path [DATADIR/gdb] */
#undef GDB_DATADIR
/* Define if the gdb-datadir directory should be relocated when GDB is moved.
*/
#undef GDB_DATADIR_RELOCATABLE
/* Define to be a string naming the default host character set. */
#undef GDB_DEFAULT_HOST_CHARSET
/* Host double floatformat */
#undef GDB_HOST_DOUBLE_FORMAT
/* Host float floatformat */
#undef GDB_HOST_FLOAT_FORMAT
/* Host long double floatformat */
#undef GDB_HOST_LONG_DOUBLE_FORMAT
/* nativefile */
#undef GDB_NM_FILE
/* Define to the default OS ABI for this configuration. */
#undef GDB_OSABI_DEFAULT
/* Define if self-testing features should be enabled */
#undef GDB_SELF_TEST
/* Define to 1 if you have `alloca', as a function or macro. */
#undef HAVE_ALLOCA
/* Define to 1 if you have <alloca.h> and it should be used (not on Ultrix).
*/
#undef HAVE_ALLOCA_H
/* Define to 1 if you have the `btowc' function. */
#undef HAVE_BTOWC
/* Define to 1 if you have the <cursesX.h> header file. */
#undef HAVE_CURSESX_H
/* Define to 1 if you have the <curses.h> header file. */
#undef HAVE_CURSES_H
/* define if the compiler supports basic C++11 syntax */
#undef HAVE_CXX11
/* Define to 1 if you have the declaration of `ADDR_NO_RANDOMIZE', and to 0 if
you don't. */
#undef HAVE_DECL_ADDR_NO_RANDOMIZE
/* Define to 1 if you have the declaration of `asprintf', and to 0 if you
don't. */
#undef HAVE_DECL_ASPRINTF
/* Define to 1 if you have the declaration of `basename(char *)', and to 0 if
you don't. */
#undef HAVE_DECL_BASENAME
/* Define to 1 if you have the declaration of `ffs', and to 0 if you don't. */
#undef HAVE_DECL_FFS
/* Define to 1 if you have the declaration of `getthrds', and to 0 if you
don't. */
#undef HAVE_DECL_GETTHRDS
/* Define to 1 if you have the declaration of `snprintf', and to 0 if you
don't. */
#undef HAVE_DECL_SNPRINTF
/* Define to 1 if you have the declaration of `strstr', and to 0 if you don't.
*/
#undef HAVE_DECL_STRSTR
/* Define to 1 if you have the declaration of `strtol', and to 0 if you don't.
*/
#undef HAVE_DECL_STRTOL
/* Define to 1 if you have the declaration of `strtoll', and to 0 if you
don't. */
#undef HAVE_DECL_STRTOLL
/* Define to 1 if you have the declaration of `strtoul', and to 0 if you
don't. */
#undef HAVE_DECL_STRTOUL
/* Define to 1 if you have the declaration of `strtoull', and to 0 if you
don't. */
#undef HAVE_DECL_STRTOULL
/* Define to 1 if you have the declaration of `strverscmp', and to 0 if you
don't. */
#undef HAVE_DECL_STRVERSCMP
/* Define to 1 if you have the declaration of `vasprintf', and to 0 if you
don't. */
#undef HAVE_DECL_VASPRINTF
/* Define to 1 if you have the declaration of `vsnprintf', and to 0 if you
don't. */
#undef HAVE_DECL_VSNPRINTF
/* Define to 1 if you have the <dlfcn.h> header file. */
#undef HAVE_DLFCN_H
/* Define if ELF support should be included. */
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/* Define if <sys/procfs.h> has elf_fpregset_t. */
#undef HAVE_ELF_FPREGSET_T
/* Define to 1 if you have the <elf_hp.h> header file. */
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/* Define to 1 if your system has the etext variable. */
#undef HAVE_ETEXT
/* Define to 1 if you have the `fdwalk' function. */
#undef HAVE_FDWALK
/* Define to 1 if you have the `fork' function. */
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/* Define if <sys/procfs.h> has fpregset_t. */
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/* Define to 1 if you have the `getauxval' function. */
#undef HAVE_GETAUXVAL
/* Define to 1 if you have the `getgid' function. */
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/* Define to 1 if you have the `getpagesize' function. */
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/* Define to 1 if you have the `getpgid' function. */
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/* Define to 1 if you have the `getrlimit' function. */
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/* Define to 1 if you have the `getrusage' function. */
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/* Define to 1 if you have the `getuid' function. */
#undef HAVE_GETUID
/* Define if <sys/procfs.h> has gregset_t. */
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/* Define if Guile interpreter is being linked in. */
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/* Define if Guile supports manual finalization. */
#undef HAVE_GUILE_MANUAL_FINALIZATION
/* Define if you have the iconv() function. */
#undef HAVE_ICONV
/* Define to 1 if you have the `iconvlist' function. */
#undef HAVE_ICONVLIST
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/* Define to 1 if you have the `kinfo_getfile' function. */
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/* Define if you have <langinfo.h> and nl_langinfo(CODESET). */
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/* Define if your <locale.h> file defines LC_MESSAGES. */
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/* Define if you have the babeltrace library. */
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/* Define to 1 if debuginfod is enabled. */
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/* Define if you have the expat library. */
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/* Define if you have the gmp library. */
#undef HAVE_LIBGMP
/* Define to 1 if you have the `libiconvlist' function. */
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/* Define if you have the ipt library. */
#undef HAVE_LIBIPT
/* Define if you have the lzma library. */
#undef HAVE_LIBLZMA
/* Define to 1 if you have the `m' library (-lm). */
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/* Define if you have the mpfr library. */
#undef HAVE_LIBMPFR
/* Define to 1 if you have the <libunwind-ia64.h> header file. */
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/* Define if you have the xxhash library. */
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/* Define to 1 if you have the <linux/elf.h> header file. */
#undef HAVE_LINUX_ELF_H
/* Define to 1 if you have the <linux/perf_event.h> header file. */
#undef HAVE_LINUX_PERF_EVENT_H
/* Define to 1 if you have the <locale.h> header file. */
#undef HAVE_LOCALE_H
/* Define to 1 if the compiler supports long double. */
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/* Define to 1 if the system has the type `long long'. */
#undef HAVE_LONG_LONG
/* Define if <sys/procfs.h> has lwpid_t. */
#undef HAVE_LWPID_T
/* Define to 1 if you have the <machine/reg.h> header file. */
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/* Define to 1 if you have the <memory.h> header file. */
#undef HAVE_MEMORY_H
/* Define to 1 if you have a working `mmap' system call. */
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/* Define to 1 if you have the `monstartup' function. */
#undef HAVE_MONSTARTUP
/* Define to 1 if you have the <ncursesw/ncurses.h> header file. */
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/* Define to 1 if you have the <ncurses.h> header file. */
#undef HAVE_NCURSES_H
/* Define to 1 if you have the <ncurses/ncurses.h> header file. */
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/* Define to 1 if you have the <ncurses/term.h> header file. */
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/* Define to 1 if you have the <nlist.h> header file. */
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/* Define if you support the personality syscall. */
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/* Define to 1 if you have the `pipe2' function. */
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/* Define to 1 if you have the `poll' function. */
#undef HAVE_POLL
/* Define to 1 if you have the <poll.h> header file. */
#undef HAVE_POLL_H
/* Define to 1 if you have the `posix_madvise' function. */
#undef HAVE_POSIX_MADVISE
/* Define to 1 if you have the `pread' function. */
#undef HAVE_PREAD
/* Define to 1 if you have the `pread64' function. */
#undef HAVE_PREAD64
/* Define if <sys/procfs.h> has prfpregset_t. */
#undef HAVE_PRFPREGSET_T
/* Define if <sys/procfs.h> has prgregset32_t. */
#undef HAVE_PRGREGSET32_T
/* Define if <sys/procfs.h> has prgregset_t. */
#undef HAVE_PRGREGSET_T
/* Define to 1 if you have the <proc_service.h> header file. */
#undef HAVE_PROC_SERVICE_H
/* Define if <sys/procfs.h> has psaddr_t. */
#undef HAVE_PSADDR_T
/* Have PTHREAD_PRIO_INHERIT. */
#undef HAVE_PTHREAD_PRIO_INHERIT
/* Define to 1 if you have the `pthread_setname_np' function. */
#undef HAVE_PTHREAD_SETNAME_NP
/* Define to 1 if you have the `pthread_sigmask' function. */
#undef HAVE_PTHREAD_SIGMASK
/* Define to 1 if you have the `ptrace64' function. */
#undef HAVE_PTRACE64
/* Define if sys/ptrace.h defines the PTRACE_GETFPXREGS request. */
#undef HAVE_PTRACE_GETFPXREGS
/* Define if sys/ptrace.h defines the PTRACE_GETREGS request. */
#undef HAVE_PTRACE_GETREGS
/* Define to 1 if you have the <ptrace.h> header file. */
#undef HAVE_PTRACE_H
/* Define if sys/ptrace.h defines the PT_GETDBREGS request. */
#undef HAVE_PT_GETDBREGS
/* Define if sys/ptrace.h defines the PT_GETXMMREGS request. */
#undef HAVE_PT_GETXMMREGS
/* Define to 1 if you have the `pt_insn_event' function. */
#undef HAVE_PT_INSN_EVENT
/* Define to 1 if you have the `pwrite' function. */
#undef HAVE_PWRITE
/* Define if Python interpreter is being linked in. */
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/* Define to 1 if you have the `resize_term' function. */
#undef HAVE_RESIZE_TERM
/* Define to 1 if you have the `sbrk' function. */
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/* Define to 1 if you have the `scm_new_smob' function. */
#undef HAVE_SCM_NEW_SMOB
/* Define to 1 if you have the `setlocale' function. */
#undef HAVE_SETLOCALE
/* Define to 1 if you have the `setns' function. */
#undef HAVE_SETNS
/* Define to 1 if you have the `setpgid' function. */
#undef HAVE_SETPGID
/* Define to 1 if you have the `setpgrp' function. */
#undef HAVE_SETPGRP
/* Define to 1 if you have the `setrlimit' function. */
#undef HAVE_SETRLIMIT
/* Define to 1 if you have the `setsid' function. */
#undef HAVE_SETSID
/* Define to 1 if you have the `sigaction' function. */
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/* Define to 1 if you have the `sigaltstack' function. */
#undef HAVE_SIGALTSTACK
/* Define to 1 if you have the <signal.h> header file. */
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/* Define to 1 if you have the `sigprocmask' function. */
#undef HAVE_SIGPROCMASK
/* Define if sigsetjmp is available. */
#undef HAVE_SIGSETJMP
/* Define to 1 if you have the `sigsetmask' function. */
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/* Define to 1 if you have the `socketpair' function. */
#undef HAVE_SOCKETPAIR
/* Define to 1 if the system has the type `socklen_t'. */
#undef HAVE_SOCKLEN_T
/* Define to 1 if the source-highlight library is available */
#undef HAVE_SOURCE_HIGHLIGHT
/* Define to 1 if you have the <stdint.h> header file. */
#undef HAVE_STDINT_H
/* Define to 1 if you have the <stdlib.h> header file. */
#undef HAVE_STDLIB_H
/* Define to 1 if you have the <strings.h> header file. */
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/* Define to 1 if you have the <string.h> header file. */
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/* Define to 1 if your system has struct lwp. */
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/* Define to 1 if `pl_syscall_code' is a member of `struct ptrace_lwpinfo'. */
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/* Define to 1 if `pl_tdname' is a member of `struct ptrace_lwpinfo'. */
#undef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME
/* Define to 1 if `enabled' is a member of `struct pt_insn'. */
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/* Define to 1 if your system has struct reg in <machine/reg.h>. */
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/* Define to 1 if `r_fs' is a member of `struct reg'. */
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/* Define to 1 if `r_gs' is a member of `struct reg'. */
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/* Define to 1 if `st_blksize' is a member of `struct stat'. */
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/* Define to 1 if `td_pcb' is a member of `struct thread'. */
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/* Define to 1 if you have the <sys/filio.h> header file. */
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/* Define to 1 if you have the <sys/ioctl.h> header file. */
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/* Define to 1 if you have the <sys/param.h> header file. */
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/* Define to 1 if you have the <sys/poll.h> header file. */
#undef HAVE_SYS_POLL_H
/* Define to 1 if you have the <sys/procfs.h> header file. */
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/* Define to 1 if you have the <sys/ptrace.h> header file. */
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/* Define to 1 if you have the <sys/reg.h> header file. */
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/* Define to 1 if you have the <sys/resource.h> header file. */
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/* Define to 1 if you have the <sys/select.h> header file. */
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/* Define to 1 if you have the <sys/socket.h> header file. */
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/* Define to 1 if you have the <sys/stat.h> header file. */
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/* Define to 1 if you have the <sys/types.h> header file. */
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/* Define to 1 if you have the <sys/un.h> header file. */
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/* Define to 1 if you have the <sys/user.h> header file. */
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/* Define to 1 if you have the <sys/wait.h> header file. */
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/* Define to 1 if you have the <termios.h> header file. */
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/* Define to 1 if you have the <term.h> header file. */
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/* Define to 1 if you have the <thread_db.h> header file. */
#undef HAVE_THREAD_DB_H
/* Define to 1 if you have the `ttrace' function. */
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/* Define to 1 if you have the <unistd.h> header file. */
#undef HAVE_UNISTD_H
/* Define to 1 if you have the `use_default_colors' function. */
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/* Define to 1 if you have the `vfork' function. */
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/* Define to 1 if you have the <vfork.h> header file. */
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/* Define to 1 if you have the `waitpid' function. */
#undef HAVE_WAITPID
/* Define to 1 if you have the <wait.h> header file. */
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/* Define to 1 if you have the `wborder' function. */
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/* Define to 1 if you have the <windows.h> header file. */
#undef HAVE_WINDOWS_H
/* Define to 1 if `fork' works. */
#undef HAVE_WORKING_FORK
/* Define to 1 if `vfork' works. */
#undef HAVE_WORKING_VFORK
/* Define to 1 if you have the `wresize' function. */
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/* Define to 1 if you have the <ws2tcpip.h> header file. */
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/* Define to 1 if you have the `XML_StopParser' function. */
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/* Define to 1 if your system has the _etext variable. */
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/* Define to 1 if you have the `_mcleanup' function. */
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/* Define if the iconv directory should be relocated when GDB is moved. */
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/* Name of this package. */
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/* Define to necessary symbol if this constant uses a non-standard name on
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/* Define to the type of arg 1 for ptrace. */
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/* Define to the type of arg 3 for ptrace. */
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/* Define if the python lib directory should be relocated when GDB is moved.
*/
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/* Bug reporting address */
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/* The size of `long', as computed by sizeof. */
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/* The size of `unsigned long long', as computed by sizeof. */
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/* If using the C implementation of alloca, define if you know the
direction of stack growth for your system; otherwise it will be
automatically deduced at runtime.
STACK_DIRECTION > 0 => grows toward higher addresses
STACK_DIRECTION < 0 => grows toward lower addresses
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/* Define to 1 if you have the ANSI C header files. */
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/* Define if <thread_db.h> has the TD_VERSION error code. */
#undef THREAD_DB_HAS_TD_VERSION
/* Enable extensions on AIX 3, Interix. */
#ifndef _ALL_SOURCE
# undef _ALL_SOURCE
#endif
/* Enable GNU extensions on systems that have them. */
#ifndef _GNU_SOURCE
# undef _GNU_SOURCE
#endif
/* Enable threading extensions on Solaris. */
#ifndef _POSIX_PTHREAD_SEMANTICS
# undef _POSIX_PTHREAD_SEMANTICS
#endif
/* Enable extensions on HP NonStop. */
#ifndef _TANDEM_SOURCE
# undef _TANDEM_SOURCE
#endif
/* Enable general extensions on Solaris. */
#ifndef __EXTENSIONS__
# undef __EXTENSIONS__
#endif
/* Define if we should use the Windows API, instead of the POSIX API. On
Windows, we use the Windows API when building for MinGW, but the POSIX API
when building for Cygwin. */
#undef USE_WIN32API
/* Define if the PPC simulator is being linked in. */
#undef WITH_PPC_SIM
/* Directory containing Python's standard libraries from --with-python-libdir.
*/
#undef WITH_PYTHON_LIBDIR
/* Define if --with-python provides a path, either directly or via
python-config.py --exec-prefix. */
#undef WITH_PYTHON_PATH
/* Define if the simulator is being linked in. */
#undef WITH_SIM
/* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most
significant byte first (like Motorola and SPARC, unlike Intel). */
#if defined AC_APPLE_UNIVERSAL_BUILD
# if defined __BIG_ENDIAN__
# define WORDS_BIGENDIAN 1
# endif
#else
# ifndef WORDS_BIGENDIAN
# undef WORDS_BIGENDIAN
# endif
#endif
/* Enable large inode numbers on Mac OS X 10.5. */
#ifndef _DARWIN_USE_64_BIT_INODE
# define _DARWIN_USE_64_BIT_INODE 1
#endif
/* Number of bits in a file offset, on hosts where this is settable. */
#undef _FILE_OFFSET_BITS
/* Define for large files, on AIX-style hosts. */
#undef _LARGE_FILES
/* Define to 1 if on MINIX. */
#undef _MINIX
/* Define to 2 if the system does not provide POSIX.1 features except with
this defined. */
#undef _POSIX_1_SOURCE
/* Define to 1 if you need to in order for `stat' and other things to work. */
#undef _POSIX_SOURCE
/* Use structured /proc on Solaris. */
#undef _STRUCTURED_PROC
/* Define to empty if `const' does not conform to ANSI C. */
#undef const
/* Define to `__inline__' or `__inline' if that's what the C compiler
calls it, or to nothing if 'inline' is not supported under any name. */
#ifndef __cplusplus
#undef inline
#endif
/* Define to `int' if <sys/types.h> does not define. */
#undef pid_t
/* Define to `unsigned int' if <sys/types.h> does not define. */
#undef size_t
/* Define as `fork' if `vfork' does not work. */
#undef vfork
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