[m-rev.] diff: updates for README.MacOS

[Julien Fischer]

Branches: main, 11.01

README.MacOS:
 	Reword the section on which grades are available on Mac OS
 	10.5 and 10.6.

 	Mention that hlc.gc will be used as the default grade for
 	building applications.

Julien.

Index: README.MacOS
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/README.MacOS,v
retrieving revision 1.17
diff -u -r1.17 README.MacOS
--- README.MacOS	7 Jan 2011 06:15:43 -0000	1.17
+++ README.MacOS	17 Mar 2011 05:53:14 -0000
@@ -9,12 +9,16 @@
  using Apple's gcc version 4.2.  This version of gcc is included with the
  Developer Tools.

-The 'asm_fast' and 'reg' grades are not currently available on Mac OS X 10.5 or
-10.6.  The configure script will automatically select the "none" grade instead.
-The high-level C, java, erlang and csharp grades all work.  The erlang grade
-requires an Erlang installation to be available and the csharp grade requires
-the Mono .NET implementation.  (See README.Erlang and README.CSharp for further
-details.)
+The 'asm_fast*' and 'reg*' grades are not currently available on Mac OS X 10.5
+or 10.6.  The only low-level C grades available are the 'none*' grades.  The
+high-level C, Java, Erlang and C# grades all work.  The 'erlang' grade requires
+an Erlang installation to be available and the C# grades require the Mono .NET
+implementation.  (See README.Erlang and README.CSharp for further details.)
+
+When installing from the source distribution the configure script will
+automatically select the 'none.gc' grade for building the Mercury system.
+Unless otherwise directed, the 'hlc.gc' grade will be used as the default grade
+for compiling applications.

  By default, 64-bit versions of the executables and libraries in the Mercury
  system will be installed on x86-64 machines running Mac OS X 10.6.  To build a

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