ninja: Set PATH for CustomTargets with built EXEs on Windows

When a CustomTarget is run with a command that is an executable built
by the project which also has a DLL built in the same project as a
dependency, the EXE can't run on Windows because the DLL can't be found.
On UNIX-like systems, we set the RPATH using the linker so these
dependencies can be found, but on Windows the only way is to set the
PATH environment variable.

The same problem exists for tests, so we reuse that infrastructure by
creating a new meson_exe.py script that can be used as a wrapper to run
CustomTarget commands on Windows. This can later also be extended to add
support for setting an environment while calling the command needed to
generate a CustomTarget: https://github.com/mesonbuild/meson/issues/266

1 files changed, 74 insertions, 0 deletions

diff --git a/mesonbuild/scripts/meson_exe.py b/mesonbuild/scripts/meson_exe.py
new file mode 100644
index 0000000..2b91de8
--- /dev/null
+++ b/mesonbuild/scripts/meson_exe.py
@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+
+# Copyright 2013-2016 The Meson development team
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import os
+import sys
+import argparse
+import pickle
+import platform
+import subprocess
+
+import mesonbuild
+
+options = None
+
+parser = argparse.ArgumentParser()
+parser.add_argument('args', nargs='+')
+
+def is_windows():
+    platname = platform.system().lower()
+    return platname == 'windows' or 'mingw' in platname
+
+def run_with_mono(fname):
+    if fname.endswith('.exe') and not is_windows():
+        return True
+    return False
+
+def run_exe(exe):
+    if exe.fname[0].endswith('.jar'):
+        cmd = ['java', '-jar'] + exe.fname
+    elif not exe.is_cross and run_with_mono(exe.fname[0]):
+        cmd = ['mono'] + exe.fname
+    else:
+        if exe.is_cross:
+            if exe.exe_runner is None:
+                raise Exception('BUG: Trying to run cross-compiled exes with no wrapper')
+            else:
+                cmd = [exe.exe_runner] + exe.fname
+        else:
+            cmd = exe.fname
+    child_env = os.environ.copy()
+    child_env.update(exe.env)
+    if len(exe.extra_paths) > 0:
+        child_env['PATH'] = child_env['PATH'] + ';'.join([''] + exe.extra_paths)
+    p = subprocess.Popen(cmd + exe.cmd_args,
+                         stdout=subprocess.PIPE,
+                         stderr=subprocess.PIPE,
+                         env=child_env,
+                         cwd=exe.workdir)
+
+def run(args):
+    global options
+    options = parser.parse_args(args)
+    if len(options.args) != 1:
+        print('Test runner for Meson. Do not run on your own, mmm\'kay?')
+        print(sys.argv[0] + ' [data file]')
+    exe_data_file = options.args[0]
+    exe = pickle.load(open(exe_data_file, 'rb'))
+    run_exe(exe)
+
+if __name__ == '__main__':
+    sys.exit(run(sys.argv[1:]))