[m-rev.] diff: document the situation with -mno-cygwin

[Julien Fischer]

Branches: main, 11.01

README.MinGW:
 	Mention an issue to do with building MinGW targeted compilers
 	in recent versions of Cygwin.

Julien.

Index: README.MinGW
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/README.MinGW,v
retrieving revision 1.14
diff -u -r1.14 README.MinGW
--- README.MinGW	15 Feb 2011 08:04:44 -0000	1.14
+++ README.MinGW	16 Feb 2011 01:10:52 -0000
@@ -96,6 +96,12 @@

  BUILDING A CYGWIN COMPILER WHICH TARGETS MINGW

+NOTE: recent versions of Cygwin no longer support the -mno-cygwin option.
+Unfortunately the Cygwin documentation is silent on the matter of how
+exactly you are now supposed to invoke the MinGW compiler from Cygwin;
+until it is updated we recommend using MinGW/MSYS to build a MinGW
+targeted compiler rather than Cygwin.
+
  To build a compiler which targets MinGW from Cygwin do the following:

  - First, install the Cygwin version of Mercury, and put it in your PATH.

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