Check for librt and clock_gettime()

move RTLD_* tests down to unix package

Check for RTLD_DEFAULT in dlfcn.h and use it if it is available.
(On Mac OS X its value is -2, and using NULL instead does not work.)

MERGE TO STABLE

Mac OS X/PowerPC: Make GHCi deal with the additional statically linked
symbols from libSystemStub.a on Tiger (printf$LDBLStub and friends).

MERGE TO STABLE

Following Apple's announcement to switch to Intel processors,
add i[3456]86-apple-darwin platform.

MERGE TO STABLE

GNU/Hurd platform (from Thomas Schwinge
<schwinge-list-ghc-users@nic-nac-project.de>)

Mac OS X:
Kill HaskellSupport.framework.
Instead, look for GMP.framework (a framework-version of libgmp), else look
for a normal -lgmp as usual.
The other part of HaskellSupport.framework, dlcompat, is no longer needed
(as of Mac OS X 10.3, it's included in libSystem).
It's enough to just use the normal configure tests for -ldl.

MERGE TO STABLE

Temper 'libm' testing -- if 'atan' is available straight from libc,
no need to include libm.

Merge to STABLE

Look for the docbook-xsl directory in /sw/share/xml/xsl/docbook-xsl,
because that's where the Fink distribution for Mac OS X puts it.

MERGE TO STABLE

aclocal.m4:FP_PROG_SORT: locate unix-like sort utility; on success, substituted as SortCmd.
-configure.ac: use FP_PROG_SORT
-mk/config.mk.in: added SORT setting..only used by libraries/Makefile

Merge to STABLE

Sanity check for $hardtop containing space characters, suggested by
Malcolm Wallace.

more regex test down to libraries/base

Automagically find docbook on FreeBSD (or anybody else who cares to store
it under /usr/local/share/xsl/docbook)

Add support for the dead code stripping feature of recent Apple linkers.
If your code is compiled using the NCG, you can now specify
-optl-W,-dead_strip on the GHC command line when linking.
It will have basically the same effect as using split-objs to build the
libraries.

Advantages over split-objs:
    * No evil perl script involved
    * Requires no special handling when building libraries

Disadvantages:
    * The current version of Apple's linker is slow when given the
      -dead_strip flag. _REALLY_ slow.
    * Mac OS X only.

This works by making the NCG emit the .subsections_via_symbols directive.
Additionally, we have to add an extra label at the top of every info table,
and make sure that the entry code references it (otherwise the info table
will be considered part of the preceding entry code).
The mangler just removes the .subsections_via_symbols directive.

Refactored and cleaned up ld-related tests. Only tested mildly under Linux.

Work around problems caused by limit on the length of the command line
in ld, which shows up when building OpenGL on Windows with SplitObjs=YES.

We now pass the names of the input files to ld via a linker script.
This is (probably) only supported by GNU ld, so we now have to detect
GNU ld in the configure script (yawn) and back off to the old method
if we don't have it.

Sanity check when configuring for mingw32: make sure that $CC is a
mingw gcc before proceeding.

--with-gcc: export the CC environment variable, so the setting gets
picked up by sub-configures.  Perhaps we should be advising people to use

  CC=c:/mingw/bin/gcc ./configure

because that works for all configure scripts, not just the top level one.

Background:

 - We want --with-gcc to do the right thing, because we don't want
   to require Cygwin users to put c:/mingw/bin first on their
   path: that would break their Cygwin environment.

 - The build system should work with *no* gcc on your PATH, as long
   as you use --with-gcc (equivalently, CC=... ./configure).

Moved GTK_CONFIG detection to ghc subdirectory (untested).

Make the X11 and HGL packages more independent, and pass configuration
parameters to package.conf.in via header files.

Also removed residual traces of OpenGL/GLUT/OpenAL from mk/config.mk.in

Pushed down OpenGL/GLUT/OpenAL autoconf stuff to the respective directories.
All packages are now built automatically if possible and if they are not
explicitly disabled. NOTE: The "--enable-hopengl" option is now split into
"--enable-opengl" and "--enable-glut".

Pushed -fomit-frame-pointer test down to ghc subdir + cleanup

Pushed "ghc has readline" check down to ghc subdir

Push down more feature-tests

Push FreeBSD-unicode-detection into package

Push some unixisms from toplvl into package:
usleep, SunOS-handling, getpw*

Update comment

Add powerpc64-unknown-linux

Get rid of SUPPORTS_EMPTY_STRUCTS, and just avoid using empty struct
definitions.

move CONST_O_BINARY detection down to libraries/base

Moved test for C/ISO types to base package, hopefully testing for all
needed headers first.

Push down the tests for errno values to the base package. There's really
no need testing for this when e.g. building Happy. :-)

Detect whether $(GHC) supports the readline package.

Look for getpwnam, getpwuid.

* Replace obsolete macro AC_TRY_RUN with AC_RUN_IFELSE
* Same for AC_TRY_LINK and AC_LINK_IFELSE
* Minor cleanup

Make autoupdate 2.52 happy, mainly by using the new formats of AC_INIT and
AC_OUTPUT. This has the nice side effect that all "packages" have now a name, a
version, a bug-report address, and a tar name, yielding better output with
"configure --help=recursive". Nuked an unused AC_STRUCT_ST_BLKSIZE test on the
way.

- Remove configure tests for SIG{POLL,INFO,WINCH}:
  Testing via #ifdef SIGFOO should be sufficient.
- Change #if HAVE_SIGPOLL to #ifdef SIGPOLL
- Remove SIGINFO/WINCH from package base: they'll reappear in package unix
  in System/Posix/Signals.Exts.

Fixed "yes" vs. "YES" confusion. This is currently really a mess and I'll
really have to clean this up someday...

Add cpp-protected signals sigINFO & sigWINCH if available.
(An autoconf-wizard might want to look at the bottom of configure.ac, the
similarities between HAVE_SIGPOLL, HAVE_SIGINFO & HAVE_SIGWINCH can surely
be factored out)