gnome.generate_gir: support generating gir for multiple libraries

Fixes #3688

7 files changed, 167 insertions, 53 deletions

diff --git a/docs/markdown/Gnome-module.md b/docs/markdown/Gnome-module.md
index 6b63f8a..cc85d87 100644
--- a/docs/markdown/Gnome-module.md
+++ b/docs/markdown/Gnome-module.md
@@ -67,10 +67,15 @@ executable(
 
 ### gnome.generate_gir()
 
-Generates GObject introspection data. Takes one positional argument,
-the build target you want to build gir data for. There are several
-keyword arguments. Many of these map directly to the `g-ir-scanner`
-tool so see its documentation for more information.
+Generates GObject introspection data.
+
+Takes one or more positional arguments:
+
+Either one or more library objects you want to build gir data for, or a single
+executable object.
+
+There are several keyword arguments. Many of these map directly to the
+`g-ir-scanner` tool so see its documentation for more information.
 
 * `dependencies`: deps to use during introspection scanning
 * `extra_args`: command line arguments to pass to gir compiler
diff --git a/docs/markdown/snippets/generate_gir_multiple_libraries.md b/docs/markdown/snippets/generate_gir_multiple_libraries.md
new file mode 100644
index 0000000..3541b71
--- /dev/null
+++ b/docs/markdown/snippets/generate_gir_multiple_libraries.md
@@ -0,0 +1,7 @@
+## gnome.generate_gir() now optionally accepts multiple libraries
+
+The GNOME module can now generate a single gir for multiple libraries, which
+is something `g-ir-scanner` supported, but had not been exposed yet.
+
+gnome.generate_gir() will now accept multiple positional arguments, if none
+of these arguments are an `Executable` instance.
diff --git a/mesonbuild/modules/gnome.py b/mesonbuild/modules/gnome.py
index f22ad1e..34dcbe8 100644
--- a/mesonbuild/modules/gnome.py
+++ b/mesonbuild/modules/gnome.py
@@ -499,54 +499,69 @@ class GnomeModule(ExtensionModule):
                     'Gir include dirs should be include_directories().')
         return ret
 
-    def _scan_lang(self, state, lang):
+    def _scan_langs(self, state, langs):
         ret = []
 
-        for link_arg in state.environment.coredata.get_external_link_args(lang):
-            if link_arg.startswith('-L'):
-                ret.append(link_arg)
+        for lang in langs:
+            for link_arg in state.environment.coredata.get_external_link_args(lang):
+                if link_arg.startswith('-L'):
+                    ret.append(link_arg)
 
         return ret
 
-    def _scan_gir_target(self, state, girtarget):
+    def _scan_gir_targets(self, state, girtargets):
         ret = []
 
-        if isinstance(girtarget, build.Executable):
-            ret += ['--program', girtarget]
-        elif isinstance(girtarget, build.SharedLibrary):
-            libname = girtarget.get_basename()
-            # Needed for the following binutils bug:
-            # https://github.com/mesonbuild/meson/issues/1911
-            # However, g-ir-scanner does not understand -Wl,-rpath
-            # so we need to use -L instead
-            for d in state.backend.determine_rpath_dirs(girtarget):
-                d = os.path.join(state.environment.get_build_dir(), d)
-                ret.append('-L' + d)
-            ret += ['--library', libname]
-            # need to put our output directory first as we need to use the
-            # generated libraries instead of any possibly installed system/prefix
-            # ones.
-            ret += ["-L@PRIVATE_OUTDIR_ABS_%s@" % girtarget.get_id()]
+        for girtarget in girtargets:
+            if isinstance(girtarget, build.Executable):
+                ret += ['--program', girtarget]
+            elif isinstance(girtarget, build.SharedLibrary):
+                libname = girtarget.get_basename()
+                # Needed for the following binutils bug:
+                # https://github.com/mesonbuild/meson/issues/1911
+                # However, g-ir-scanner does not understand -Wl,-rpath
+                # so we need to use -L instead
+                for d in state.backend.determine_rpath_dirs(girtarget):
+                    d = os.path.join(state.environment.get_build_dir(), d)
+                    ret.append('-L' + d)
+                ret += ['--library', libname]
+                # need to put our output directory first as we need to use the
+                # generated libraries instead of any possibly installed system/prefix
+                # ones.
+                ret += ["-L@PRIVATE_OUTDIR_ABS_%s@" % girtarget.get_id()]
 
         return ret
 
-    def _get_girtarget_lang_compiler(self, girtarget):
-        for lang, compiler in girtarget.compilers.items():
-            # XXX: Can you use g-i with any other language?
-            if lang in ('c', 'cpp', 'objc', 'objcpp', 'd'):
-                break
-        else:
-            lang = None
-            compiler = None
+    def _get_girtargets_langs_compilers(self, girtargets):
+        ret = []
+        for girtarget in girtargets:
+            for lang, compiler in girtarget.compilers.items():
+                # XXX: Can you use g-i with any other language?
+                if lang in ('c', 'cpp', 'objc', 'objcpp', 'd'):
+                    ret.append((lang, compiler))
+                    break
+
+        return ret
 
-        return lang, compiler
+    def _get_gir_targets_deps(self, girtargets):
+        ret = []
+        for girtarget in girtargets:
+            ret += girtarget.get_all_link_deps()
+            ret += girtarget.get_external_deps()
+        return ret
+
+    def _get_gir_targets_inc_dirs(self, girtargets):
+        ret = []
+        for girtarget in girtargets:
+            ret += girtarget.get_include_dirs()
+        return ret
 
-    def _get_lang_compiler_flags(self, state, lang, compiler):
+    def _get_langs_compilers_flags(self, state, langs_compilers):
         cflags = []
         internal_ldflags = []
         external_ldflags = []
 
-        if lang and compiler:
+        for lang, compiler in langs_compilers:
             if state.global_args.get(lang):
                 cflags += state.global_args[lang]
             if state.project_args.get(lang):
@@ -562,8 +577,8 @@ class GnomeModule(ExtensionModule):
 
         return cflags, internal_ldflags, external_ldflags
 
-    def _make_gir_filelist(self, state, srcdir, ns, nsversion, girtarget, libsources):
-        gir_filelist_dir = state.backend.get_target_private_dir_abs(girtarget)
+    def _make_gir_filelist(self, state, srcdir, ns, nsversion, girtargets, libsources):
+        gir_filelist_dir = state.backend.get_target_private_dir_abs(girtargets[0])
         if not os.path.isdir(gir_filelist_dir):
             os.mkdir(gir_filelist_dir)
         gir_filelist_filename = os.path.join(gir_filelist_dir, '%s_%s_gir_filelist' % (ns, nsversion))
@@ -658,21 +673,30 @@ class GnomeModule(ExtensionModule):
 
         return typelib_includes
 
+    def _get_external_args_for_langs(self, state, langs):
+        ret = []
+        for lang in langs:
+            ret += state.environment.coredata.get_external_args(lang)
+        return ret
+
     @FeatureNewKwargs('build target', '0.40.0', ['build_by_default'])
     @permittedKwargs({'sources', 'nsversion', 'namespace', 'symbol_prefix', 'identifier_prefix',
                       'export_packages', 'includes', 'dependencies', 'link_with', 'include_directories',
                       'install', 'install_dir_gir', 'install_dir_typelib', 'extra_args',
                       'packages', 'header', 'build_by_default'})
     def generate_gir(self, state, args, kwargs):
-        if len(args) != 1:
-            raise MesonException('Gir takes one argument')
+        if not args:
+            raise MesonException('generate_gir takes at least one argument')
         if kwargs.get('install_dir'):
             raise MesonException('install_dir is not supported with generate_gir(), see "install_dir_gir" and "install_dir_typelib"')
 
         giscanner = self.interpreter.find_program_impl('g-ir-scanner')
         gicompiler = self.interpreter.find_program_impl('g-ir-compiler')
 
-        girtarget = self._unwrap_gir_target(args[0])
+        girtargets = [self._unwrap_gir_target(arg) for arg in args]
+
+        if len(girtargets) > 1 and any([isinstance(el, build.Executable) for el in girtargets]):
+            raise MesonException('generate_gir only accepts a single argument when one of the arguments is an executable')
 
         self.gir_dep, pkgargs = self._get_gir_dep(state)
 
@@ -682,12 +706,12 @@ class GnomeModule(ExtensionModule):
         girfile = '%s-%s.gir' % (ns, nsversion)
         srcdir = os.path.join(state.environment.get_source_dir(), state.subdir)
         builddir = os.path.join(state.environment.get_build_dir(), state.subdir)
-        depends = [girtarget]
+        depends = [] + girtargets
         gir_inc_dirs = []
-        lang, compiler = self._get_girtarget_lang_compiler(girtarget)
-        cflags, internal_ldflags, external_ldflags = self._get_lang_compiler_flags(state, lang, compiler)
-        deps = (girtarget.get_all_link_deps() + girtarget.get_external_deps() +
-                extract_as_list(kwargs, 'dependencies', pop=True, unholder=True))
+        langs_compilers = self._get_girtargets_langs_compilers(girtargets)
+        cflags, internal_ldflags, external_ldflags = self._get_langs_compilers_flags(state, langs_compilers)
+        deps = self._get_gir_targets_deps(girtargets)
+        deps += extract_as_list(kwargs, 'dependencies', pop=True, unholder=True)
         typelib_includes = self._gather_typelib_includes_and_update_depends(state, deps, depends)
         # ldflags will be misinterpreted by gir scanner (showing
         # spurious dependencies) but building GStreamer fails if they
@@ -697,6 +721,7 @@ class GnomeModule(ExtensionModule):
         cflags += list(dep_cflags)
         internal_ldflags += list(dep_internal_ldflags)
         external_ldflags += list(dep_external_ldflags)
+        girtargets_inc_dirs = self._get_gir_targets_inc_dirs(girtargets)
         inc_dirs = self._scan_inc_dirs(kwargs)
 
         scan_command = [giscanner]
@@ -708,8 +733,8 @@ class GnomeModule(ExtensionModule):
         scan_command += self._scan_header(kwargs)
         scan_command += self._scan_extra_args(kwargs)
         scan_command += ['-I' + srcdir, '-I' + builddir]
-        scan_command += get_include_args(girtarget.get_include_dirs())
-        scan_command += ['--filelist=' + self._make_gir_filelist(state, srcdir, ns, nsversion, girtarget, libsources)]
+        scan_command += get_include_args(girtargets_inc_dirs)
+        scan_command += ['--filelist=' + self._make_gir_filelist(state, srcdir, ns, nsversion, girtargets, libsources)]
         scan_command += self._scan_link_withs(state, depends, kwargs)
         scan_command += self._scan_include(state, depends, gir_inc_dirs, kwargs)
         scan_command += self._scan_symbol_prefix(kwargs)
@@ -717,12 +742,12 @@ class GnomeModule(ExtensionModule):
         scan_command += self._scan_export_packages(kwargs)
         scan_command += ['--cflags-begin']
         scan_command += cflags
-        scan_command += state.environment.coredata.get_external_args(lang)
+        scan_command += self._get_external_args_for_langs(state, [lc[0] for lc in langs_compilers])
         scan_command += ['--cflags-end']
         scan_command += get_include_args(inc_dirs)
         scan_command += get_include_args(list(gi_includes) + gir_inc_dirs + inc_dirs, prefix='--add-include-path=')
-        scan_command += self._scan_gir_target(state, girtarget)
-        scan_command += self._scan_lang(state, lang)
+        scan_command += self._scan_gir_targets(state, girtargets)
+        scan_command += self._scan_langs(state, [lc[0] for lc in langs_compilers])
         scan_command += list(internal_ldflags)
         scan_command += list(external_ldflags)
 
diff --git a/test cases/frameworks/7 gnome/gir/meson-sample2.c b/test cases/frameworks/7 gnome/gir/meson-sample2.c
new file mode 100644
index 0000000..f76bc16
--- /dev/null
+++ b/test cases/frameworks/7 gnome/gir/meson-sample2.c
@@ -0,0 +1,45 @@
+#include "meson-sample2.h"
+
+struct _MesonSample2
+{
+  GObject parent_instance;
+};
+
+G_DEFINE_TYPE (MesonSample2, meson_sample2, G_TYPE_OBJECT)
+
+/**
+ * meson_sample2_new:
+ *
+ * Allocates a new #MesonSample2.
+ *
+ * Returns: (transfer full): a #MesonSample2.
+ */
+MesonSample2 *
+meson_sample2_new (void)
+{
+  return g_object_new (MESON_TYPE_SAMPLE2, NULL);
+}
+
+static void
+meson_sample2_class_init (MesonSample2Class *klass)
+{
+}
+
+static void
+meson_sample2_init (MesonSample2 *self)
+{
+}
+
+/**
+ * meson_sample2_print_message:
+ * @self: a #MesonSample2.
+ *
+ * Prints Hello.
+ *
+ * Returns: Nothing.
+ */
+void
+meson_sample2_print_message (MesonSample2 *self)
+{
+  g_print ("Message: Hello\n");
+}
diff --git a/test cases/frameworks/7 gnome/gir/meson-sample2.h b/test cases/frameworks/7 gnome/gir/meson-sample2.h
new file mode 100644
index 0000000..d39084e
--- /dev/null
+++ b/test cases/frameworks/7 gnome/gir/meson-sample2.h
@@ -0,0 +1,21 @@
+#ifndef MESON_SAMPLE2_H
+#define MESON_SAMPLE2_H
+
+#if !defined (MESON_TEST)
+#error "MESON_TEST not defined."
+#endif
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define MESON_TYPE_SAMPLE2 (meson_sample2_get_type())
+
+G_DECLARE_FINAL_TYPE (MesonSample2, meson_sample2, MESON, SAMPLE2, GObject)
+
+MesonSample2 *meson_sample2_new           (void);
+void          meson_sample2_print_message (MesonSample2 *self);
+
+G_END_DECLS
+
+#endif /* MESON_SAMPLE2_H */
diff --git a/test cases/frameworks/7 gnome/gir/meson.build b/test cases/frameworks/7 gnome/gir/meson.build
index 1771548..36bd09c 100644
--- a/test cases/frameworks/7 gnome/gir/meson.build
+++ b/test cases/frameworks/7 gnome/gir/meson.build
@@ -1,6 +1,7 @@
 subdir('dep1')
 
 libsources = ['meson-sample.c', 'meson-sample.h']
+lib2sources = ['meson-sample2.c', 'meson-sample2.h']
 
 girlib = shared_library(
   'gir_lib',
@@ -9,6 +10,13 @@ girlib = shared_library(
   install : true
 )
 
+girlib2 = shared_library(
+  'gir_lib2',
+  sources : lib2sources,
+  dependencies : [gobj],
+  install : true
+)
+
 girexe = executable(
   'girprog',
   sources : 'prog.c',
@@ -19,8 +27,8 @@ girexe = executable(
 fake_dep = dependency('no-way-this-exists', required: false)
 
 gnome.generate_gir(
-  girlib,
-  sources : libsources,
+  girlib, girlib2,
+  sources : libsources + lib2sources,
   nsversion : '1.0',
   namespace : 'Meson',
   symbol_prefix : 'meson',
diff --git a/test cases/frameworks/7 gnome/gir/prog.py b/test cases/frameworks/7 gnome/gir/prog.py
index 7ce2aa7..aa1f9a7 100755
--- a/test cases/frameworks/7 gnome/gir/prog.py
+++ b/test cases/frameworks/7 gnome/gir/prog.py
@@ -6,3 +6,6 @@ if __name__ == "__main__":
     dep1 = MesonDep1.Dep1.new()
     dep2 = MesonDep2.Dep2.new("Hello, meson/py!")
     s.print_message(dep1, dep2)
+
+    s2 = Meson.Sample2.new()
+    s2.print_message()