[m-rev.] diff: update configuration test

[Simon Taylor]

Estimated hours taken: 0.1
Branches: main

configure.in:
	When checking whether the installed compiler is up-to-date,
	check whether it creates `.c_date' files. If not, it won't
	work with the latest version of scripts/Mmake.rules.

Index: configure.in
===================================================================
RCS file: /home/mercury1/repository/mercury/configure.in,v
retrieving revision 1.272
diff -u -u -r1.272 configure.in
--- configure.in	2001/07/09 08:22:54	1.272
+++ configure.in	2001/07/10 16:20:48
@@ -108,10 +108,13 @@
 			).
 EOF
 	if
+		# The installed compiler must create `.c_date' files
+		# to be compatible with scripts/Mmake.rules.
 	 	echo $BOOTSTRAP_MC conftest >&AC_FD_CC 2>&1 &&
 	 	$BOOTSTRAP_MC \
 			--halt-at-warn --link-flags "--static" conftest \
 		 	</dev/null >&AC_FD_CC 2>&1 &&
+		test -f ./conftest.c_date &&
 		test "`./conftest 2>&1 | tr -d '\015'`" = "Hello, world"
 	then
 		AC_MSG_RESULT(yes)
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