backend/vs: Generate dependencies for CustomTargetIndex for a CustomTarget.

Test & fix.

mesonbuild/build.py

@@ -2334,6 +2334,8 @@ class CustomTarget(Target, CommandBase):
         for c in self.sources:
             if isinstance(c, (BuildTarget, CustomTarget)):
                 deps.append(c)
+            if isinstance(c, CustomTargetIndex):
+                deps.append(c.target)
         return deps
 
     def get_transitive_build_target_deps(self) -> T.Set[T.Union[BuildTarget, 'CustomTarget']]:

test cases/common/245 custom target index source/code_source.c

@@ -0,0 +1,6 @@
+extern int genfunc(void);
+
+int genfunc(void)
+{
+  return 0;
+}

test cases/common/245 custom target index source/copyfile.py

@@ -0,0 +1,6 @@
+#!/usr/bin/env python3
+
+import sys
+import shutil
+
+shutil.copyfile(sys.argv[1], sys.argv[2])

test cases/common/245 custom target index source/copyfile2.py

@@ -0,0 +1,7 @@
+#!/usr/bin/env python3
+
+import sys
+import shutil
+
+shutil.copyfile(sys.argv[1], sys.argv[2])
+shutil.copyfile(sys.argv[3], sys.argv[4])

test cases/common/245 custom target index source/header_source.h

@@ -0,0 +1 @@
+extern int genfunc(void);

test cases/common/245 custom target index source/main.c

@@ -0,0 +1,6 @@
+#include "gen.h"
+
+int main(void)
+{
+  return genfunc();
+}

test cases/common/245 custom target index source/meson.build

@@ -0,0 +1,50 @@
+project('custom target index source', 'c')
+
+# Test that using a custom target index as a sourcefile works correctly
+
+copy1 = find_program('copyfile.py')
+copy2 = find_program('copyfile2.py')
+
+step_1 = custom_target('step_1',
+  input: ['code_source.c', files('header_source.h')],
+  output: ['step_1.c', 'step_1.h'],
+  command: [copy2, '@INPUT0@', '@OUTPUT0@', '@INPUT1@', '@OUTPUT1@'],
+  build_by_default: false)
+
+# test custom target with a single CustomTargetIndex input
+step_2_c = custom_target('step_2_c',
+  input: step_1[0],
+  output: 'step_2.c',
+  command: [copy1, '@INPUT0@', '@OUTPUT0@'],
+  build_by_default: false)
+
+step_2_h = custom_target('step_2_h',
+  input: step_1[1],
+  output: 'step_2.h',
+  command: [copy1, '@INPUT0@', '@OUTPUT0@'],
+  build_by_default: false,
+)
+
+# test custom target with multiple CustomTargetIndex inputs
+gen = custom_target('step_3',
+  input: [step_2_c, step_2_h],
+  output: ['gen.c', 'gen.h'],
+  command: [copy2, '@INPUT0@', '@OUTPUT0@', '@INPUT1@', '@OUTPUT1@'],
+  build_by_default: false)
+gen_c = gen[0]
+gen_h = gen[1]
+
+exe_separate = executable('exe_separate',
+  ['main.c', gen_c, gen_h],
+  build_by_default: false,
+  install: false,
+)
+
+exe_together = executable('exe_together',
+  ['main.c', gen],
+  build_by_default: false,
+  install: false,
+)
+
+test('exe_separate', exe_separate)
+test('exe_together', exe_together)