internal/rosa: m4 artifact

Autotools dependency.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/gnu.go

@@ -10,7 +10,8 @@ func (t Toolchain) NewMake() pkg.Artifact {
 	)
 	return t.New("make-"+version, nil, nil, nil, `
 cd "$(mktemp -d)"
-/usr/src/make/configure --prefix=/system \
+/usr/src/make/configure \
+	--prefix=/system \
 	--build="${ROSA_TRIPLE}" \
 	--disable-dependency-tracking
 ./build.sh
@@ -21,5 +22,28 @@ cd "$(mktemp -d)"
 		mustDecode(checksum),
 		pkg.TarGzip,
 	)))
+}
+
+// NewM4 returns a [pkg.Artifact] containing an installation of GNU M4.
+func (t Toolchain) NewM4() pkg.Artifact {
+	const (
+		version  = "1.4.20"
+		checksum = "RT0_L3m4Co86bVBY3lCFAEs040yI1WdeNmRylFpah8IZovTm6O4wI7qiHJN3qsW9"
+	)
+	return t.New("m4-"+version, []pkg.Artifact{
+		t.NewMake(),
+	}, nil, nil, `
+cd "$(mktemp -d)"
+/usr/src/m4/configure \
+	--prefix=/system \
+	--build="${ROSA_TRIPLE}"
+make "-j$(nproc)"
+make DESTDIR=/work install
+`, pkg.Path(AbsUsrSrc.Append("m4"), false, pkg.NewHTTPGetTar(
+		nil,
+		"https://ftp.gnu.org/gnu/m4/m4-"+version+".tar.bz2",
+		mustDecode(checksum),
+		pkg.TarBzip2,
+	)))
 
 }