ninja: add build dir to javac -sourcepath

To allow the javac -implicit:class behaviour to know where to find
generated .java files then the build directory for the target is also
added to the -sourcefile path.

mesonbuild/backend/ninjabackend.py

@@ -1031,6 +1031,7 @@ int dummy;
         args += compiler.get_output_args(self.get_target_private_dir(target))
         curdir = target.get_subdir()
         sourcepath = os.path.join(self.build_to_src, curdir) + os.pathsep
+        sourcepath += os.path.normpath(curdir) + os.pathsep
         for i in target.include_dirs:
             for idir in i.get_incdirs():
                 sourcepath += os.path.join(self.build_to_src, i.curdir, idir) + os.pathsep

test cases/java/7 codegen/com/mesonbuild/Config.java.in

@@ -0,0 +1,5 @@
+package com.mesonbuild;
+
+public class Config {
+    public static final boolean FOOBAR = @foobar@;
+}

test cases/java/7 codegen/com/mesonbuild/Simple.java

@@ -0,0 +1,12 @@
+package com.mesonbuild;
+
+import com.mesonbuild.Config;
+
+class Simple {
+    public static void main(String [] args) {
+        if (Config.FOOBAR) {
+            TextPrinter t = new TextPrinter("Printing from Java.");
+            t.print();
+        }
+    }
+}

test cases/java/7 codegen/com/mesonbuild/TextPrinter.java

@@ -0,0 +1,14 @@
+package com.mesonbuild;
+
+class TextPrinter {
+
+    private String msg;
+    
+    TextPrinter(String s) {
+        msg = s;
+    }
+    
+    public void print() {
+        System.out.println(msg);
+    }
+}

test cases/java/7 codegen/com/mesonbuild/meson.build

@@ -0,0 +1,6 @@
+
+conf_data = configuration_data()
+conf_data.set('foobar', 'true')
+config_file = configure_file(input : 'Config.java.in',
+                             output : 'Config.java',
+                             configuration : conf_data)

test cases/java/7 codegen/meson.build

@@ -0,0 +1,15 @@
+# If we generate code under the build directory then the backend needs to add
+# the build directory to the -sourcepath passed to javac otherwise the compiler
+# won't be able to handle the -implicit:class behaviour of automatically
+# compiling dependency classes.
+
+project('codegenjava', 'java')
+
+subdir('com/mesonbuild')
+
+javaprog = jar('myprog',
+ config_file,
+ 'com/mesonbuild/Simple.java',
+ 'com/mesonbuild/TextPrinter.java',
+  main_class : 'com.mesonbuild.Simple')
+test('subdirtest', javaprog)