[Mono-list] Autoconf macros to correctly detect Mono C# mcs

[Peter Ross]

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On Wed, 2003-11-26 at 22:32, William S Fulton wrote:
> We need to detect whether C# is installed on Unix systems and are
> using a simple autoconf macro to look for mcs. Unfortunately there
> is another program called mcs and so it incorrectly detects mcs.
> Does anyone know of any better autoconf macros to detect whether mcs
> installed and whether or not it is a working C# compiler?

Find attached the code we have in the Mercury compiler to detect whether
one has a recent enough version of the compiler to bootstrap the
compiler.

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MERCURY_MSG("looking for an already installed Mercury compiler to bootstrap with...")
AC_PATH_PROG(BOOTSTRAP_MC,mmc)
if test "$BOOTSTRAP_MC" != ""; then
	AC_MSG_CHECKING(whether $BOOTSTRAP_MC works and is sufficiently recent)
	cat > conftest.m << EOF
		% this module contains features which didn't work in
		% previous versions of the Mercury compiler
		% We may also test to see if the installed compiler is
		% recent enough by checking what flags mmc takes.
		% Use [[ ]] for lists.
		:- module conftest.
		:- interface.
		:- import_module io.
		:- pred main(io__state::di, io__state::uo) is det.

		:- implementation.

		:- import_module int.
        
		main(!IO) :-
			return_rtti_version(Version),
			(
				Version >= 8,
				ac(2) ^ elem(3, 5) = 17
			->
				io.print("Hello, world\n", !IO)
			;
				io.print("Nope.\n", !IO)
			).

		:- type a    ---> ac(int).

		:- func a ^ elem(int, int) = int.
		:- mode in ^ elem(in,  in ) = out is det.

		ac(T) ^ elem(I, J) = T + I * J.

		:- pred return_rtti_version(int::out) is det.

		:- pragma foreign_proc("C", return_rtti_version(Version::out),
			[[will_not_call_mercury, promise_pure]], "
			Version = MR_RTTI_VERSION;
		").
EOF
	if
		# Test for the `--read-config-file-2003-03-01' option
		echo $BOOTSTRAP_MC conftest >&AC_FD_CC 2>&1 &&
		$BOOTSTRAP_MC \
			--verbose \
			--read-config-file-2003-03-01 \
			--halt-at-warn $link_static_opt conftest \
			</dev/null >&AC_FD_CC 2>&1 &&
		test "`./conftest 2>&1 | tr -d '\015'`" = "Hello, world"
	then
		AC_MSG_RESULT(yes)
	else
		BOOTSTRAP_MC=
		AC_MSG_RESULT(no)
	fi
	rm -f conftest*
fi

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