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gen_makefile: --targets: fix subdir projects

Some projects are in subdirectories of git repositories, such as
simtrace2_host, or osmocom-bb_layer23. When filtering the targets to be
added to the Makefile, we must also add the main projects of such
projects in subdirectories, so Makefile rules like the following work:

  .make.simtrace2_host.clone: .make.simtrace2.clone

Fix for:
  make: *** No rule to make target '.make.simtrace2.clone', needed by '.make.simtrace2_host.clone'.  Stop.

Fixes: 1d13c9d7 ("gen_makefile: add --targets")
Change-Id: I136f0d9cd982653b109005aeb35885b6f015eec8
---
M gen_makefile.py
M tests/test_gen_makefile.py
2 files changed, 8 insertions(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-dev refs/changes/78/40978/1

diff --git a/gen_makefile.py b/gen_makefile.py
index 4730c59..3885e10 100755
--- a/gen_makefile.py
+++ b/gen_makefile.py
@@ -243,6 +243,12 @@
           print()
           sys.exit(1)
 
+        # simtrace2_host -> simtrace2
+        if "_" in project:
+          project_main = project.split("_")[0]
+          if project_main in projects_deps and project_main not in ret:
+            queue += [project_main]
+
         deps = projects_deps[project]
         ret[project] = deps
 
diff --git a/tests/test_gen_makefile.py b/tests/test_gen_makefile.py
index 6232003..622f6e7 100644
--- a/tests/test_gen_makefile.py
+++ b/tests/test_gen_makefile.py
@@ -67,10 +67,11 @@
 
 
 def test_gen_makefile_with_targets_arg(tmp_path):
-    run_cmd(["./gen_makefile.py", "-m", tmp_path, "--targets", "trxcon,osmo-mgw"], cwd=osmo_dev_path)
+    run_cmd(["./gen_makefile.py", "-m", tmp_path, "--targets", "trxcon,osmo-mgw,simtrace2_host"], cwd=osmo_dev_path)
     run_cmd("grep -q '^osmocom-bb_trxcon_files :=' Makefile", cwd=tmp_path, shell=True)
     run_cmd("grep -q '^osmo-mgw_files :=' Makefile", cwd=tmp_path, shell=True)
     run_cmd("grep -q '^libosmocore_files :=' Makefile", cwd=tmp_path, shell=True)
+    run_cmd("grep -q '^simtrace2_files :=' Makefile", cwd=tmp_path, shell=True)
     run_cmd("! grep -q '^osmo-bts_files :=' Makefile", cwd=tmp_path, shell=True)
     run_cmd("! grep -q '^osmo-s1gw_files :=' Makefile", cwd=tmp_path, shell=True)
     run_cmd("! grep -q '^open5gs_files :=' Makefile", cwd=tmp_path, shell=True)

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