[gobject-introspection] Meson: Fix build as subproject

[Christoph Reiter <creiter src gnome org>]

commit f8e080d03bb490e3539a2a7e0c4a5e7a20fcd863
Author: Xavier Claessens <xavier claessens collabora com>
Date:   Wed May 6 14:24:34 2020 -0400

    Meson: Fix build as subproject
    
    meson.build_root() is the root of the main project, better use
    meson.current_build_dir() instead.

 meson.build                  |  2 ++
 tests/meson.build            | 10 +++++-----
 tests/repository/meson.build | 10 +++++-----
 tests/scanner/meson.build    | 40 ++++++++++++++++++++--------------------
 tests/warn/meson.build       |  8 ++++----
 5 files changed, 36 insertions(+), 34 deletions(-)
---
diff --git a/meson.build b/meson.build
index c730b2c6..6f3ba8c8 100644
--- a/meson.build
+++ b/meson.build
@@ -9,6 +9,8 @@ project('gobject-introspection', 'c',
 
 host_system = host_machine.system()
 gi_versions = meson.project_version().split('.')
+build_root = meson.current_build_dir()
+source_root = meson.current_source_dir()
 
 configinc = include_directories('.')
 
diff --git a/tests/meson.build b/tests/meson.build
index f4c57ed7..b240749e 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -115,8 +115,8 @@ if glib_dep.type_name() == 'pkgconfig'
       '--output=@OUTPUT@',
       '--no-libtool',
       '--reparse-validate',
-      '--add-include-path', join_paths(meson.source_root(), 'gir'),
-      '--add-include-path', join_paths(meson.build_root(), 'gir'),
+      '--add-include-path', join_paths(source_root, 'gir'),
+      '--add-include-path', join_paths(build_root, 'gir'),
       '--warn-all',
       '--warn-error',
       '--namespace=Everything',
@@ -141,8 +141,8 @@ if glib_dep.type_name() == 'pkgconfig'
       '--output=@OUTPUT@',
       '--no-libtool',
       '--reparse-validate',
-      '--add-include-path', join_paths(meson.source_root(), 'gir'),
-      '--add-include-path', join_paths(meson.build_root(), 'gir'),
+      '--add-include-path', join_paths(source_root, 'gir'),
+      '--add-include-path', join_paths(build_root, 'gir'),
       '--warn-all',
       '--warn-error',
       '--namespace=GIMarshallingTests',
@@ -163,7 +163,7 @@ if glib_dep.type_name() == 'pkgconfig'
       output: '@BASENAME@.typelib',
       depends: [gobject_gir, ],
       command: [gircompiler, '-o', '@OUTPUT@', '@INPUT@',
-                '--includedir', join_paths(meson.build_root(), 'gir'),
+                '--includedir', join_paths(build_root, 'gir'),
                 '--includedir', meson.current_build_dir()
       ],
     )
diff --git a/tests/repository/meson.build b/tests/repository/meson.build
index 497ab106..17445381 100644
--- a/tests/repository/meson.build
+++ b/tests/repository/meson.build
@@ -10,17 +10,17 @@ if glib_dep.type_name() == 'pkgconfig'
   repository_test_env = environment()
   repository_test_env.prepend(
     'GI_TYPELIB_PATH',
-    join_paths(meson.build_root(), 'gir'),
-    join_paths(meson.build_root(), 'tests'),
-    join_paths(meson.build_root(), 'tests', 'scanner'),
+    join_paths(build_root, 'gir'),
+    join_paths(build_root, 'tests'),
+    join_paths(build_root, 'tests', 'scanner'),
   )
   repository_test_env.prepend(
     'LD_LIBRARY_PATH',
-    join_paths(meson.build_root(), 'tests', 'scanner'),
+    join_paths(build_root, 'tests', 'scanner'),
   )
   if host_system == 'windows'
     repository_test_env.prepend(
-      'PATH', join_paths(meson.build_root(), 'tests', 'scanner'))
+      'PATH', join_paths(build_root, 'tests', 'scanner'))
   endif
 
   custom_c_args = cc.get_supported_arguments([
diff --git a/tests/scanner/meson.build b/tests/scanner/meson.build
index 50ca5a2b..fa7f7eca 100644
--- a/tests/scanner/meson.build
+++ b/tests/scanner/meson.build
@@ -106,7 +106,7 @@ python_path = run_command(python, ['-c', 'import sys; sys.stdout.write(sys.execu
 
 gircompiler_command = [
   gircompiler, '-o', '@OUTPUT@', '@INPUT@',
-  '--includedir', join_paths(meson.build_root(), 'gir'),
+  '--includedir', join_paths(build_root, 'gir'),
   '--includedir', meson.current_build_dir(),
 ]
 
@@ -122,8 +122,8 @@ if glib_dep.type_name() == 'pkgconfig'
       '--output=@OUTPUT@',
       '--no-libtool',
       '--reparse-validate',
-      '--add-include-path', join_paths(meson.source_root(), 'gir'),
-      '--add-include-path', join_paths(meson.build_root(), 'gir'),
+      '--add-include-path', join_paths(source_root, 'gir'),
+      '--add-include-path', join_paths(build_root, 'gir'),
       '--warn-all',
       '--warn-error',
       '--namespace=Typedefs',
@@ -162,8 +162,8 @@ if glib_dep.type_name() == 'pkgconfig'
       '--output=@OUTPUT@',
       '--no-libtool',
       '--reparse-validate',
-      '--add-include-path', join_paths(meson.source_root(), 'gir'),
-      '--add-include-path', join_paths(meson.build_root(), 'gir'),
+      '--add-include-path', join_paths(source_root, 'gir'),
+      '--add-include-path', join_paths(build_root, 'gir'),
       '--warn-all',
       '--warn-error',
       '--namespace=Bar',
@@ -173,7 +173,7 @@ if glib_dep.type_name() == 'pkgconfig'
       '--library=barapp-1.0',
       '--accept-unprefixed',
       '-L', meson.current_build_dir(),
-      '-L', join_paths(meson.build_root(), 'girepository'),
+      '-L', join_paths(build_root, 'girepository'),
       '-I', meson.current_source_dir(),
       '-I', join_paths(meson.current_source_dir(), '..'),
       extra_giscanner_args,
@@ -201,8 +201,8 @@ if glib_dep.type_name() == 'pkgconfig'
       '--output=@OUTPUT@',
       '--no-libtool',
       '--reparse-validate',
-      '--add-include-path', join_paths(meson.source_root(), 'gir'),
-      '--add-include-path', join_paths(meson.build_root(), 'gir'),
+      '--add-include-path', join_paths(source_root, 'gir'),
+      '--add-include-path', join_paths(build_root, 'gir'),
       '--warn-all',
       '--warn-error',
       '--namespace=SLetter',
@@ -239,8 +239,8 @@ if glib_dep.type_name() == 'pkgconfig'
       '--output=@OUTPUT@',
       '--no-libtool',
       '--reparse-validate',
-      '--add-include-path', join_paths(meson.source_root(), 'gir'),
-      '--add-include-path', join_paths(meson.build_root(), 'gir'),
+      '--add-include-path', join_paths(source_root, 'gir'),
+      '--add-include-path', join_paths(build_root, 'gir'),
       '--namespace=WarnLib',
       '--nsversion=1.0',
       '--include=Gio-2.0',
@@ -275,8 +275,8 @@ if glib_dep.type_name() == 'pkgconfig'
       '--output=@OUTPUT@',
       '--no-libtool',
       '--reparse-validate',
-      '--add-include-path', join_paths(meson.source_root(), 'gir'),
-      '--add-include-path', join_paths(meson.build_root(), 'gir'),
+      '--add-include-path', join_paths(source_root, 'gir'),
+      '--add-include-path', join_paths(build_root, 'gir'),
       '--warn-all',
       '--warn-error',
       '--namespace=Utility',
@@ -313,8 +313,8 @@ if glib_dep.type_name() == 'pkgconfig'
       '--output=@OUTPUT@',
       '--no-libtool',
       '--reparse-validate',
-      '--add-include-path', join_paths(meson.source_root(), 'gir'),
-      '--add-include-path', join_paths(meson.build_root(), 'gir'),
+      '--add-include-path', join_paths(source_root, 'gir'),
+      '--add-include-path', join_paths(build_root, 'gir'),
       '--warn-all',
       '--warn-error',
       '--namespace=GtkFrob',
@@ -352,8 +352,8 @@ if glib_dep.type_name() == 'pkgconfig'
       '--output=@OUTPUT@',
       '--no-libtool',
       '--reparse-validate',
-      '--add-include-path', join_paths(meson.source_root(), 'gir'),
-      '--add-include-path', join_paths(meson.build_root(), 'gir'),
+      '--add-include-path', join_paths(source_root, 'gir'),
+      '--add-include-path', join_paths(build_root, 'gir'),
       '--namespace=GetType',
       '--nsversion=1.0',
       '--identifier-prefix=GetType',
@@ -483,8 +483,8 @@ if glib_dep.type_name() == 'pkgconfig'
       '--output=@OUTPUT@',
       '--no-libtool',
       '--reparse-validate',
-      '--add-include-path', join_paths(meson.source_root(), 'gir'),
-      '--add-include-path', join_paths(meson.build_root(), 'gir'),
+      '--add-include-path', join_paths(source_root, 'gir'),
+      '--add-include-path', join_paths(build_root, 'gir'),
       '--add-include-path', meson.current_build_dir(),
       '--namespace=Regress',
       '--nsversion=1.0',
@@ -542,7 +542,7 @@ if has_girdoctool and glib_dep.type_name() == 'pkgconfig'
       output: 'Regress-1.0-' + language,
       command: [
         python, girdoctool,
-        '--add-include-path=' + join_paths(meson.build_root(), 'gir'),
+        '--add-include-path=' + join_paths(build_root, 'gir'),
         '--add-include-path=' + meson.current_build_dir(),
         '--language', language,
         '@INPUT@', '-o', '@OUTPUT@'],
@@ -570,7 +570,7 @@ if has_girdoctool and glib_dep.type_name() == 'pkgconfig'
     output: 'Regress-1.0-sections.txt',
     command: [
       python, girdoctool,
-      '--add-include-path=' + join_paths(meson.build_root(), 'gir'),
+      '--add-include-path=' + join_paths(build_root, 'gir'),
       '--add-include-path=' + meson.current_build_dir(),
       '--write-sections-file',
       '@INPUT@', '-o', '@OUTPUT@'],
diff --git a/tests/warn/meson.build b/tests/warn/meson.build
index 1f144e70..9641787f 100644
--- a/tests/warn/meson.build
+++ b/tests/warn/meson.build
@@ -21,12 +21,12 @@ warn_tests = [
 ]
 
 warn_test_env = environment()
-warn_test_env.set('UNINSTALLED_INTROSPECTION_SRCDIR', meson.source_root())
-warn_test_env.set('TOP_BUILDDIR', meson.build_root())
+warn_test_env.set('UNINSTALLED_INTROSPECTION_SRCDIR', source_root)
+warn_test_env.set('TOP_BUILDDIR', build_root)
 warn_test_env.set(
   'PYTHONPATH',
-  meson.build_root(),
-  join_paths(meson.build_root(), 'giscanner'))
+  build_root,
+  join_paths(build_root, 'giscanner'))
 
 # FIXME: Glib as a subproject (used on Windows mostly).
 if glib_dep.type_name() == 'pkgconfig'