Rename README.QUICK to LICENSE and install it by default

README.QUICK contains the package copyright and licensing terms, it is
more natural to name the file as LICENSE.

* CMakeLists.txt [enable_docs] (install): Add LICENSE for
$CMAKE_INSTALL_DOCDIR; remove note that README.QUICK is not installed.
* README.QUICK: Rename to LICENSE.
* Makefile.am (EXTRA_DIST): Do not add README.QUICK.
* README.md (Copyright & Warranty, Contributors): Rename README.QUICK
to LICENSE.
* doc/README.DGUX386: Refer to README.md instead of README.QUICK.
* doc/doc.am [ENABLE_DOCS] (dist_doc_DATA): Add LICENSE.

1 files changed, 98 insertions, 0 deletions

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 00000000..00d52163
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,98 @@
+Copyright (c) 1988-1989 Hans-J. Boehm, Alan J. Demers
+Copyright (c) 1991-1996 by Xerox Corporation.  All rights reserved.
+Copyright (c) 1996-1999 by Silicon Graphics.  All rights reserved.
+Copyright (c) 1998 by Fergus Henderson.  All rights reserved.
+Copyright (c) 1999-2001 by Red Hat, Inc.  All rights reserved.
+Copyright (c) 1999-2011 Hewlett-Packard Development Company, L.P.
+Copyright (c) 2004-2005 Andrei Polushin
+Copyright (c) 2007 Free Software Foundation, Inc.
+Copyright (c) 2008-2021 Ivan Maidanski
+Copyright (c) 2011 Ludovic Courtes
+Copyright (c) 2018 Petter A. Urkedal
+
+THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
+OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
+
+Permission is hereby granted to use or copy this program
+for any purpose,  provided the above notices are retained on all copies.
+Permission to modify the code and to distribute modified code is granted,
+provided the above notices are retained, and a notice that the code was
+modified is included with the above copyright notice.
+
+Several files (include/gc_allocator.h, extra/msvc_dbg.c) come with slightly
+different licenses, though they are all similar in spirit (the exact
+licensing terms are given at the beginning of the corresponding source file).
+
+A few of the files needed
+to use the GNU-style build procedure come with a modified GPL license
+that appears not to significantly restrict use of the collector, though
+use of those files for a purpose other than building the collector may
+require the resulting code to be covered by the GPL.
+
+For more details and the names of other contributors, see the README.md,
+doc/README.*, AUTHORS and include/gc.h files.  These files describe typical
+use of the collector on a machine that is already supported.
+
+For the version number, see README.md or include/gc_version.h files.
+
+INSTALLATION:
+Under UN*X, Linux, Cygwin:
+Alternative 1 (the old way): type "make -f Makefile.direct check".
+        Link against libgc.a.
+
+Alternative 2 (the new way): type
+        "./configure --prefix=<dir>; make; make check; make install".
+        Link against <dir>/lib/libgc.a or <dir>/lib/libgc.so.
+        See doc/README.autoconf for details.
+
+Alternative 3 (another new way): type
+        "mkdir out; cd out; cmake ..; cmake --build ."
+        See doc/README.cmake for details.
+
+Under Windows 95, 98, Me, NT, or 2000:
+copy the appropriate makefile to MAKEFILE, read it, and type "nmake check".
+(Under Windows, this assumes you have Microsoft command-line tools
+installed, and suitably configured.)
+Read the machine specific README.XXX in the doc directory if one exists.
+
+If you need thread support, you should define GC_THREADS as described in
+doc/README.macros (configure defines this implicitly unless --disable-threads
+option is given).
+
+If you wish to use the cord (structured string) library with the stand-alone
+Makefile.direct, type "make -f Makefile.direct cords".  (You may need to
+override CC specified in the Makefile. The CORD_printf implementation in
+cordprnt.c is known to be less than perfectly portable.  The rest of the
+package should still work.)  See include/cord.h for the API.
+
+If you wish to use the collector from C++, type "make c++", or use
+--enable-cplusplus with the configure script.  This creates libgccpp.a and
+libgctba.a files, or their shared library equivalents (libgccpp.so and
+libgctba.so).  You should link with either the first or the second one, but
+not both.  See include/gc_cpp.h and doc/gcinterface.md.
+
+TYPICAL USE:
+Include "gc.h" from the include subdirectory.  Link against the
+appropriate library ("libgc.a" under UN*X).  Replace calls to malloc
+by calls to GC_MALLOC, and calls to realloc by calls to GC_REALLOC.
+If the object is known to never contain pointers, use GC_MALLOC_ATOMIC
+instead of GC_MALLOC.
+
+Define GC_DEBUG before including gc.h for additional checking.
+
+More documentation on the collector interface can be found in README.md,
+doc/gcinterface.md, include/gc.h, and other files in the doc directory.
+
+WARNINGS:
+
+Do not store the only pointer to an object in memory allocated
+with system malloc, since the collector usually does not scan
+memory allocated in this way.
+
+Use with threads may be supported on your system, but requires the collector
+to be built with thread support.  See Makefile.am or Makefile.direct.
+The collector does not guarantee to scan thread-local storage (e.g. of the
+kind accessed with pthread_getspecific()).  The collector does scan
+thread stacks though, so generally the best solution is to ensure that
+any pointers stored in thread-local storage are also stored on the
+thread's stack for the duration of their lifetime.