gnome.genmarshal: restore the ability to pass sources as Files objects

It used to support:
- a single string
- an array of anything

And as long as CustomTarget supported it too, everything worked fine.
So, a `files('foo')` worked but a `files('foo')[0]` did not, which is
silly... and it's not exactly terrible to use files() here, the input is
literally a list of source files.

Fixes building gnome-terminal
Fixes #9827

Test updated by Nirbheek Chauhan <nirbheek@centricular.com>

3 files changed, 61 insertions, 17 deletions

diff --git a/test cases/frameworks/7 gnome/genmarshal/main.c b/test cases/frameworks/7 gnome/genmarshal/main.c.in
index 83b08af..8e3ca7a 100644
--- a/test cases/frameworks/7 gnome/genmarshal/main.c
+++ b/test cases/frameworks/7 gnome/genmarshal/main.c.in
@@ -1,7 +1,7 @@
-#include<stdio.h>
-#include<stdlib.h>
-#include<glib-object.h>
-#include"marshaller.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <glib-object.h>
+#include @MARSHALLER_HEADER@
 
 static int singleton = 42;
 
diff --git a/test cases/frameworks/7 gnome/genmarshal/meson.build b/test cases/frameworks/7 gnome/genmarshal/meson.build
index d7189f5..7686b4b 100644
--- a/test cases/frameworks/7 gnome/genmarshal/meson.build
+++ b/test cases/frameworks/7 gnome/genmarshal/meson.build
@@ -1,12 +1,51 @@
-marshallers = gnome.genmarshal('marshaller',
-sources : 'marshaller.list',
-install_header : true,
-install_dir : get_option('includedir'),
-extra_args : ['-UG_ENABLE_DEBUG', '--prototypes'])
-
-marshaller_c = marshallers[0]
-marshaller_h = marshallers[1]
-
-genmarshalexe = executable('genmarshalprog', 'main.c', marshaller_c, marshaller_h,
-dependencies : gobj)
-test('genmarshal test', genmarshalexe)
+m_list = configure_file(input: 'marshaller.list',
+  output: 'm.list',
+  copy: true)
+
+idx = 0
+mlists = ['marshaller.list', files('marshaller.list'), m_list]
+
+foreach mlist : mlists
+  marshallers = gnome.genmarshal('marshaller-@0@'.format(idx),
+  sources : mlist,
+  install_header : true,
+  install_dir : get_option('includedir') / 'subdir-@0@'.format(idx),
+  extra_args : ['-UG_ENABLE_DEBUG', '--prototypes'])
+
+  marshaller_c = marshallers[0]
+  marshaller_h = marshallers[1]
+
+  cdata = configuration_data()
+  cdata.set_quoted('MARSHALLER_HEADER', 'marshaller-@0@.h'.format(idx))
+
+  main_c = configure_file(input: 'main.c.in',
+    output: 'main-@0@.c'.format(idx),
+    configuration: cdata)
+
+  genmarshalexe = executable('genmarshalprog-@0@'.format(idx),
+    main_c, marshaller_c, marshaller_h,
+    dependencies : gobj)
+  test('genmarshal test @0@'.format(idx), genmarshalexe)
+  idx += 1
+endforeach
+
+foreach mlist : mlists
+  marshallers = gnome.genmarshal('marshaller-@0@'.format(idx),
+  sources : [mlist],
+  install_header : true,
+  install_dir : get_option('includedir') / 'subdir-@0@'.format(idx),
+  extra_args : ['-UG_ENABLE_DEBUG', '--prototypes'])
+
+  marshaller_c = marshallers[0]
+  marshaller_h = marshallers[1]
+
+  main_c = configure_file(input: 'main.c.in',
+    output: 'main-@0@.c'.format(idx),
+    configuration: cdata)
+
+  genmarshalexe = executable('genmarshalprog-@0@'.format(idx),
+    main_c, marshaller_c, marshaller_h,
+    dependencies : gobj)
+  test('genmarshal test @0@'.format(idx), genmarshalexe)
+  idx += 1
+endforeach
diff --git a/test cases/frameworks/7 gnome/test.json b/test cases/frameworks/7 gnome/test.json
index d243cff..0d17384 100644
--- a/test cases/frameworks/7 gnome/test.json
+++ b/test cases/frameworks/7 gnome/test.json
@@ -4,7 +4,12 @@
     {"type": "file", "file": "usr/include/enums2.h"},
     {"type": "file", "file": "usr/include/enums3.h"},
     {"type": "file", "file": "usr/include/enums5.h"},
-    {"type": "file", "file": "usr/include/marshaller.h"},
+    {"type": "file", "file": "usr/include/subdir-0/marshaller-0.h"},
+    {"type": "file", "file": "usr/include/subdir-1/marshaller-1.h"},
+    {"type": "file", "file": "usr/include/subdir-2/marshaller-2.h"},
+    {"type": "file", "file": "usr/include/subdir-3/marshaller-3.h"},
+    {"type": "file", "file": "usr/include/subdir-4/marshaller-4.h"},
+    {"type": "file", "file": "usr/include/subdir-5/marshaller-5.h"},
     {"type": "expr", "file": "usr/lib/?libgir_lib.so"},
     {"type": "file", "platform": "cygwin", "file": "usr/lib/libgir_lib.dll.a"},
     {"type": "expr", "file": "usr/lib/?libgir_lib2.so"},