Summary of config.h variables and questions.

[Rob Browning]

It looks like Andreas suggested approach of using AC_CONFIG_COMMANDS
to handle our public header will work.  I've made the corresponding
adjustments to our tree (but haven't committed yet), and have arranged
it so that config.h is still automatically generated by
autoheader/configure and libguile/scmconfig.h is now our public
header.

I've also been through *all* of our defines in config.h and evaluated
each one to figure out what should be done with it.  However, I
haven't actually been able to compile yet because there are some
outstanding issues that still need to be resolved.

The config.h symbols fall into three categories.  The first (and
smallest) are the symbols that were being used in some of our .h files
(i.e. were definitely public), *and* had suitable names for public
use.  For these, I just arranged for configure to put them into
libguile/scmconfig.h unmolested:

  GUILE_DEBUG
  GUILE_DEBUG_FREELIST
  SCM_ENABLE_DEPRECATED
  SCM_ENABLE_ELISP
  SCM_STACK_GROWS_UP (how does this relate to STACK_DIRECTION?)

The second category is comprised of those symbols that we were using
in our public headers, but whose names are probably not suitable for
the global namespace.  These I haven't done anything about because I
wanted to see how everyone else thought we should handle them.  One
option would be to add an SCM_ prefix to all of their names and carry
on.  Of course doing so would break any client code that was using
these symbols, but this may be a case where such a change is
warranted, since we probably shouldn't have used these names
publically in the first place.

Another alternative for some of the symbols might be to rewrite the
code in a way that eliminates the need for a given symbol to be in our
public headers, though I suspect the number of cases where we can do
that easily is small (note that if it helps, we can do some
computation in configure.in before adding the #defines to scmconfig.h
-- precomputing #define contents, etc.).  Here are the symbols that we
have to decide about:

  DEBUG_EXTENSIONS
  HAVE_ARRAYS
  HAVE_FLOATINGPOINT_H
  HAVE_IEEEFP_H
  HAVE_INLINE
  HAVE_INTTYPES_H
  HAVE_LIMITS_H
  HAVE_NAN_H
  HAVE_STDINT_H
  HAVE_STRUCT_TIMESPEC
  HAVE_SYS_STDTYPES_H
  HAVE_SYS_TIME_H
  HAVE_SYS_TYPES_H
  HAVE_TIME_H
  HAVE_WINSOCK
  SIZEOF_LONG
  SIZEOF_LONG_LONG
  SIZEOF_PTRDIFF_T
  SIZEOF_UINTPTR_T
  STDC_HEADERS
  TIME_WITH_SYS_TIME
  USE_DLL_IMPORT
  USE_NULL_THREADS
  USE_PTHREAD_THREADS
  _POSIX_
  _THREAD_SAFE
  const
  inline

Note that "const" and "inline" above are normally #defined by
configure in config.h to be something suitable for the given platform
when possible, or #undef'ed otherwise.  If we have been (or want to)
take advantage of this facility in our public headers, we probably
need to use SCM_INLINE and SCM_CONST or similar...

The third category contains those symbols which weren't being used
publically.  They were only being used by .c files or non-public
headers, or weren't being used at all.  For these, I just made sure
that the relevant files include config.h properly:

  #if HAVE_CONFIG_H
  #  include <config.h>
  #endif

So presuming we don't mind removing any of these symbols from our
public API, we should be finished with them:

  CRAY_STACKSEG_END
  C_ALLOCA
  DYNAMIC_LINKING
  GETGROUPS_T
  GUILE_DEBUG_MALLOC
  GUILE_ISELECT
  HAVE_ALLOCA
  HAVE_ALLOCA_H
  HAVE_ARGZ_APPEND
  HAVE_ARGZ_CREATE_SEP
  HAVE_ARGZ_H
  HAVE_ARGZ_INSERT
  HAVE_ARGZ_NEXT
  HAVE_ARGZ_STRINGIFY
  HAVE_ASSERT_H
  HAVE_ATEXIT
  HAVE_BCOPY
  HAVE_CHOWN
  HAVE_CHROOT
  HAVE_CONNECT
  HAVE_COPYSIGN
  HAVE_CRYPT_H
  HAVE_CTERMID
  HAVE_CTYPE_H
  HAVE_CUSERID
  HAVE_DIRECT_H
  HAVE_DIRENT_H
  HAVE_DLD
  HAVE_DLD_H
  HAVE_DLERROR
  HAVE_DLFCN_H
  HAVE_DL_H
  HAVE_ENDHOSTENT
  HAVE_ENDNETENT
  HAVE_ENDPROTOENT
  HAVE_ENDSERVENT
  HAVE_ERRNO_H
  HAVE_ERROR_T
  HAVE_FCHOWN
  HAVE_FCNTL
  HAVE_FINITE
  HAVE_FLOCK
  HAVE_FORK
  HAVE_FTIME
  HAVE_GETCWD
  HAVE_GETEUID
  HAVE_GETGRENT
  HAVE_GETGROUPS
  HAVE_GETHOSTBYNAME
  HAVE_GETITIMER
  HAVE_GETLOGIN
  HAVE_GETNETBYADDR
  HAVE_GETNETBYNAME
  HAVE_GETNETENT
  HAVE_GETPASS
  HAVE_GETPGRP
  HAVE_GETPPID
  HAVE_GETPRIORITY
  HAVE_GETPROTOINT
  HAVE_GETPWENT
  HAVE_GETSERVENT
  HAVE_GETTIMEOFDAY
  HAVE_GRP_H
  HAVE_HSTRERROR
  HAVE_H_ERRNO
  HAVE_INDEX
  HAVE_INET_ATON
  HAVE_INET_LNAOF
  HAVE_INET_NETOF
  HAVE_INET_NTOP
  HAVE_INET_PTON
  HAVE_IO_H
  HAVE_IPV6
  HAVE_ISINF
  HAVE_ISNAN
  HAVE_KILL
  HAVE_LIBCRYPT
  HAVE_LIBC_H
  HAVE_LIBC_STACK_END
  HAVE_LIBDL
  HAVE_LIBGMP
  HAVE_LIBM
  HAVE_LIBNSL
  HAVE_LIBREGEX
  HAVE_LIBRX
  HAVE_LIBSOCKET
  HAVE_LIBWS2_32
  HAVE_LINK
  HAVE_LSTAT
  HAVE_MALLOC_H
  HAVE_MEMCPY
  HAVE_MEMMOVE
  HAVE_MEMORY_H
  HAVE_MKDIR
  HAVE_MKNOD
  HAVE_MKSTEMP
  HAVE_NDIR_H
  HAVE_NETWORKING
  HAVE_NICE
  HAVE_ON_EXIT
  HAVE_PAUSE
  HAVE_POSIX
  HAVE_PRELOADED_SYMBOLS
  HAVE_PUTENV
  HAVE_PWD_H
  HAVE_READLINK
  HAVE_REGCOMP
  HAVE_REGEX_H
  HAVE_RENAME
  HAVE_RESTARTABLE_SYSCALLS
  HAVE_RINDEX
  HAVE_SELECT
  HAVE_SETEGID
  HAVE_SETEUID
  HAVE_SETHOSTENT
  HAVE_SETHOSTNAME
  HAVE_SETITIMER
  HAVE_SETLOCALE
  HAVE_SETNETENT
  HAVE_SETPGID
  HAVE_SETPRIORITY
  HAVE_SETPROTOENT
  HAVE_SETPWENT
  HAVE_SETSERVENT
  HAVE_SETSID
  HAVE_SHL_LOAD
  HAVE_SIGACTION
  HAVE_SIGINTERRUPT
  HAVE_SIN
  HAVE_SOCKETPAIR
  HAVE_STDIO_H
  HAVE_STDLIB_H
  HAVE_STRCHR
  HAVE_STRCMP
  HAVE_STRDUP
  HAVE_STRERROR
  HAVE_STRFTIME
  HAVE_STRINGS_H
  HAVE_STRING_H
  HAVE_STRPTIME
  HAVE_STRRCHR
  HAVE_STRUCT_LINGER
  HAVE_STRUCT_STAT_ST_BLKSIZE
  HAVE_STRUCT_STAT_ST_BLOCKS
  HAVE_STRUCT_STAT_ST_RDEV
  HAVE_STRUCT_TM_TM_ZONE
  HAVE_ST_BLOCKS
  HAVE_SYMLINK
  HAVE_SYNC
  HAVE_SYSTEM
  HAVE_SYS_DIR_H
  HAVE_SYS_DL_H
  HAVE_SYS_FILE_H
  HAVE_SYS_IOCTL_H
  HAVE_SYS_NDIR_H
  HAVE_SYS_RESOURCE_H
  HAVE_SYS_SELECT_H
  HAVE_SYS_STAT_H
  HAVE_SYS_STDTYPES_H
  HAVE_SYS_TIMEB_H
  HAVE_SYS_TIMES_H
  HAVE_SYS_UTIME_H
  HAVE_SYS_UTSNAME_H
  HAVE_SYS_WAIT_H
  HAVE_S_ISLNK
  HAVE_TCGETPGRP
  HAVE_TCSETPGRP
  HAVE_TIMES
  HAVE_TM_ZONE
  HAVE_TTYNAME
  HAVE_TZNAME
  HAVE_TZSET
  HAVE_UINT32_T
  HAVE_UNAME
  HAVE_UNISTD_H
  HAVE_UNIX_DOMAIN_SOCKETS
  HAVE_USLEEP
  HAVE_UTIME_H
  HAVE_WAITPID
  LIBC_H_WITH_UNISTD_H
  LOCALTIME_CACHE
  LTDL_DLOPEN_DEPLIBS
  LTDL_OBJDIR
  LTDL_SHLIBPATH_VAR
  LTDL_SHLIB_EXT
  LTDL_SYSSEARCHPATH
  MISSING_SLEEP_DECL
  MISSING_STRPTIME_DECL
  MISSING_USLEEP_DECL
  NEED_USCORE
  PACKAGE_BUGREPORT
  PACKAGE_NAME
  PACKAGE_STRING
  PACKAGE_TARNAME
  PACKAGE_VERSION
  READER_EXTENSIONS
  SCM_MUTEXATTR_SETTYPE_DECLARED (should this be SCM_I_?)
  SCM_MUTEX_FAST
  SCM_MUTEX_RECURSIVE
  SCM_SINGLES
  SCM_WARN_DEPRECATED_DEFAULT
  SIZEOF_INT
  SIZEOF_SHORT
  SIZEOF_SIZE_T
  SIZEOF_UNSIGNED_INT
  SIZEOF_UNSIGNED_LONG
  SIZEOF_UNSIGNED_LONG_LONG
  SIZEOF_UNSIGNED_SHORT
  SIZEOF_VOID_P
  STACK_DIRECTION
  TM_IN_SYS_TIME
  USE_THREADS
  USLEEP_RETURNS_VOID
  UTIMBUF_NEEDS_POSIX
  WORDS_BIGENDIAN
  _ALL_SOURCE
  _MINIX
  _POSIX_SOURCE
  error_t
  gid_t
  mode_t
  uid_t

-- 
Rob Browning
rlb @defaultvalue.org, @linuxdevel.com, and @debian.org
Previously @cs.utexas.edu
GPG starting 2002-11-03 = 14DD 432F AE39 534D B592  F9A0 25C8 D377 8C7E 73A4