templates: fix --executable

* In 1.7.1, the behaviour of --executable was to just ignore it.
* After my recent 9104bb616766bd9a05f0b2f280359463d32e227d, the behaviour
  was that we'd require, for --executable xyz, xyz.c to exist or we'd
  fail to generate.

Neither are good! Instead, create the sample source file w/ the project
name, but call the executable whatever the user passed with `--executable`.

Bug: https://github.com/mesonbuild/meson/issues/15286

1 files changed, 14 insertions, 0 deletions

diff --git a/unittests/allplatformstests.py b/unittests/allplatformstests.py
index 2c5123281..554217043 100644
--- a/unittests/allplatformstests.py
+++ b/unittests/allplatformstests.py
@@ -2541,6 +2541,20 @@ class AllPlatformTests(BasePlatformTests):
                 self._run(ninja,
                             workdir=os.path.join(tmpdir, 'builddir'))
 
+            # custom executable name
+            if target_type == 'executable':
+                with tempfile.TemporaryDirectory() as tmpdir:
+                    self._run(self.meson_command + ['init', '--language', lang, '--type', target_type,
+                                                    '--executable', 'foobar'], workdir=tmpdir)
+                    self._run(self.setup_command + ['--backend=ninja', 'builddir'],
+                                workdir=tmpdir)
+                    self._run(ninja,
+                                workdir=os.path.join(tmpdir, 'builddir'))
+
+                    if lang not in {'cs', 'java'}:
+                        exe = os.path.join(tmpdir, 'builddir', 'foobar' + exe_suffix)
+                        self.assertTrue(os.path.exists(exe))
+
         def _template_test_dirty(lang, target_type):
             if is_windows() and lang == 'fortran' and target_type == 'library':
                 # non-Gfortran Windows Fortran compilers do not do shared libraries in a Fortran standard way