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See: http://www.gnu.org/software/autoconf/manual/html_node/Obsolete-Macros.html

On recent GNU ELF systems one can mark an object file as not
requiring an executable stack. If all objects- linked into a
program have this note then the program will not use an executable
stack, which is good for security (and some distros have it as a
QA policy). GHC generated code does not need an executable stack
so add the note to the assembly output of the native code
generator (conditional on a configure test).

Consistently used spaces rather than tabs.
Removed trailing whitespace.
Wrapped comments to fit in a standard terminal.

Happy, Alex and Haddock are built separately using Cabal now.

Most of the other users of the fptools build system have migrated to
Cabal, and with the move to darcs we can now flatten the source tree
without losing history, so here goes.

The main change is that the ghc/ subdir is gone, and most of what it
contained is now at the top level.  The build system now makes no
pretense at being multi-project, it is just the GHC build system.

No doubt this will break many things, and there will be a period of
instability while we fix the dependencies.  A straightforward build
should work, but I haven't yet fixed binary/source distributions.
Changes to the Building Guide will follow, too.

check for ctime_r

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*