Add a flag only_install to omit the plain make step

Summary:
X-link: https://github.com/facebookincubator/zstrong/pull/849

Needed for installing ghc binaries, which have an autoconf-based
distribution that only supports `make install`, not `make`.

Reviewed By: chadaustin

Differential Revision: D58011865

fbshipit-source-id: db7c3cc45701201466a6b2853c5f3515b178fa74

build/fbcode_builder/getdeps/builder.py

@@ -362,6 +362,8 @@ class AutoconfBuilder(BuilderBase):
                 self._run_cmd(["autoreconf", "-ivf"], cwd=self.src_dir, env=env)
         configure_cmd = [configure_path, "--prefix=" + self.inst_dir] + self.args
         self._run_cmd(configure_cmd, env=env)
+        only_install = self.manifest.get("build", "only_install", "false", ctx=self.ctx)
+        if not only_install:
             self._run_cmd([self._make_binary, "-j%s" % self.num_jobs], env=env)
         self._run_cmd([self._make_binary, "install"], env=env)
 

build/fbcode_builder/getdeps/manifest.py

@@ -64,6 +64,7 @@ SCHEMA = {
             "subdir": OPTIONAL,
             "make_binary": OPTIONAL,
             "build_in_src_dir": OPTIONAL,
+            "only_install": OPTIONAL,
             "job_weight_mib": OPTIONAL,
             "patchfile": OPTIONAL,
             "patchfile_opts": OPTIONAL,