cmake: resolve IMPORTED executables in custom commands (fixes #7509)

mesonbuild/cmake/interpreter.py

@@ -651,7 +651,7 @@ class ConverterCustomTarget:
     def __repr__(self) -> str:
         return '<{}: {} {}>'.format(self.__class__.__name__, self.name, self.outputs)
 
-    def postprocess(self, output_target_map: OutputTargetMap, root_src_dir: str, subdir: str, all_outputs: T.List[str]) -> None:
+    def postprocess(self, output_target_map: OutputTargetMap, root_src_dir: str, subdir: str, all_outputs: T.List[str], trace: CMakeTraceParser) -> None:
         # Default the working directory to ${CMAKE_CURRENT_BINARY_DIR}
         if not self.working_dir:
             self.working_dir = self.current_bin_dir.as_posix()
@@ -694,7 +694,18 @@ class ConverterCustomTarget:
                 if not j:
                     continue
                 target = output_target_map.executable(j)
-                cmd += [target] if target else [j]
+                if target:
+                    cmd += [target]
+                    continue
+                elif j in trace.targets:
+                    trace_tgt = trace.targets[j]
+                    if trace_tgt.type == 'EXECUTABLE' and 'IMPORTED_LOCATION' in trace_tgt.properties:
+                        cmd += trace_tgt.properties['IMPORTED_LOCATION']
+                        continue
+                    mlog.debug('CMake: Found invalid CMake target "{}" --> ignoring \n{}'.format(j, trace_tgt))
+
+                # Fallthrough on error
+                cmd += [j]
 
             commands += [cmd]
         self.command = commands
@@ -969,7 +980,7 @@ class CMakeInterpreter:
         object_libs = []
         custom_target_outputs = []  # type: T.List[str]
         for i in self.custom_targets:
-            i.postprocess(self.output_target_map, self.src_dir, self.subdir, custom_target_outputs)
+            i.postprocess(self.output_target_map, self.src_dir, self.subdir, custom_target_outputs, self.trace)
         for i in self.targets:
             i.postprocess(self.output_target_map, self.src_dir, self.subdir, self.install_prefix, self.trace)
             if i.type == 'OBJECT_LIBRARY':

mesonbuild/cmake/traceparser.py

@@ -269,6 +269,7 @@ class CMakeTraceParser:
         args = list(tline.args) # Make a working copy
 
         # Make sure the exe is imported
+        is_imported = True
         if 'IMPORTED' not in args:
             return self._gen_exception('add_executable', 'non imported executables are not supported', tline)
 
@@ -277,7 +278,7 @@ class CMakeTraceParser:
         if len(args) < 1:
             return self._gen_exception('add_executable', 'requires at least 1 argument', tline)
 
-        self.targets[args[0]] = CMakeTarget(args[0], 'EXECUTABLE', {})
+        self.targets[args[0]] = CMakeTarget(args[0], 'EXECUTABLE', {}, tline=tline, imported=is_imported)
 
     def _cmake_add_library(self, tline: CMakeTraceLine):
         # DOC: https://cmake.org/cmake/help/latest/command/add_library.html

test cases/cmake/11 cmake_module_path/meson.build

@@ -1,7 +1,7 @@
 # We use Python3 as it's the only thing guaranteed to be available on any platform Meson can run on (unlike Zlib in linuxlike/13 cmake dependency).
 
 project('user CMake find_package module using cmake_module_path',
-  meson_version: '>= 0.50.0')
+  meson_version: '>= 0.55.0')
 
 if not find_program('cmake', required: false).found()
   error('MESON_SKIP_TEST cmake binary not available.')
@@ -15,3 +15,11 @@ endif
 dependency('SomethingLikePython', required : true, method : 'cmake', cmake_module_path : 'cmake', modules: 'Python::Interpreter')
 
 dependency('SomethingLikePython', method : 'cmake', cmake_module_path : ['doesNotExist', 'cmake'], modules: 'Python::Interpreter')
+
+# Test a custom target with Python::Interpreter in COMMAND
+cm = import('cmake')
+op = cm.subproject_options()
+op.add_cmake_defines({'CMAKE_MODULE_PATH': meson.source_root() / 'cmake'})
+sp = cm.subproject('cmMod', options: op)
+main = sp.target('main')
+test('main', main)

test cases/cmake/11 cmake_module_path/subprojects/cmMod/CMakeLists.txt

@@ -0,0 +1,15 @@
+cmake_minimum_required(VERSION 3.5)
+
+project(cmMod)
+
+message(STATUS "CMAKE_MODULE_PATH: '${CMAKE_MODULE_PATH}'")
+
+find_package(SomethingLikePython REQUIRED)
+
+add_custom_command(
+  OUTPUT            "${CMAKE_CURRENT_BINARY_DIR}/main.c"
+  COMMAND           Python::Interpreter "${CMAKE_CURRENT_SOURCE_DIR}/gen.py"
+  WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
+)
+
+add_executable(main "${CMAKE_CURRENT_BINARY_DIR}/main.c")

test cases/cmake/11 cmake_module_path/subprojects/cmMod/gen.py

@@ -0,0 +1,9 @@
+with open('main.c', 'w') as fp:
+  print('''
+#include <stdio.h>
+
+int main(void) {
+  printf(\"Hello World\");
+  return 0;
+}
+''', file=fp)