[m-rev.] diff: increase the compiler's C stack size on Cygwin64

[Julien Fischer]

Increase the compiler's C stack size on Cygwin64.

compiler/Mmakefile:
     As above.

Julien.

diff --git a/compiler/Mmakefile b/compiler/Mmakefile
index a375954..8a58194 100644
--- a/compiler/Mmakefile
+++ b/compiler/Mmakefile
@@ -2,6 +2,7 @@
  # vim: ts=8 sw=8 noexpandtab ft=make
  #-----------------------------------------------------------------------------#
  # Copyright (C) 1995-2003, 2005-2012 The University of Melbourne.
+# Copyright (C) 2013-2017, 2019-2020, 2022-2023 The Mercury team.
  # This file may only be copied under the terms of the GNU General
  # Public Licence - see the file COPYING in the Mercury distribution.
  #-----------------------------------------------------------------------------#
@@ -63,14 +64,17 @@ ifneq ("$(findstring -J\"-Xmx,$(JAVACFLAGS))","")
  JAVACFLAGS   += -J\"-Xmx2048m\"
  endif

-# The default C stack size of 1Mb on Windows is not enough to compile the
-# standard library in the hlc.gc grade using a Mercury compiler built in
-# the hlc.gc grade with the MinGW64 GCC or clang.
+# The default C stack size of 1Mb on Windows is not enough to bootcheck the
+# system using a Mercury compiler built in the hlc.gc grade with MinGW64 GCC,
+# Cygwin GCC or MinGW64 clang.
  # XXX For MSVC, we currently set the stack size in the ml script.
  ifneq ("$(USING_MICROSOFT_CL_COMPILER)", "yes")
  ifneq ("$(findstring x86_64-w64-mingw32,$(FULLARCH))","")
  LDFLAGS += -Wl,--stack=8388608
  endif
+ifneq ("$(findstring x86_64-pc-cygwin,$(FULLARCH))","")
+LDFLAGS += -Wl,--stack=8388608
+endif
  endif

  #-----------------------------------------------------------------------------#