gnome: Fix crash in gtkdoc and generate_gir in C++ projects

gtkdoc() and generate_gir() methods assumes there is a C compiler, but
pure C++ projects might not add it explicitly.

Fixes: #12162

4 files changed, 25 insertions, 0 deletions

diff --git a/test cases/frameworks/37 gir cpp/foo.cpp b/test cases/frameworks/37 gir cpp/foo.cpp
new file mode 100644
index 000000000..15fa26980
--- /dev/null
+++ b/test cases/frameworks/37 gir cpp/foo.cpp
@@ -0,0 +1,5 @@
+#include "foo.h"
+
+int foo_do_something(void) {
+    return 42;
+}
diff --git a/test cases/frameworks/37 gir cpp/foo.h b/test cases/frameworks/37 gir cpp/foo.h
new file mode 100644
index 000000000..cac03d3c1
--- /dev/null
+++ b/test cases/frameworks/37 gir cpp/foo.h
@@ -0,0 +1 @@
+int foo_do_something(void);
diff --git a/test cases/frameworks/37 gir cpp/meson.build b/test cases/frameworks/37 gir cpp/meson.build
new file mode 100644
index 000000000..c8bf42812
--- /dev/null
+++ b/test cases/frameworks/37 gir cpp/meson.build
@@ -0,0 +1,16 @@
+project('gnome module without C', 'cpp')
+
+gi = dependency('gobject-introspection-1.0', required: false)
+if not gi.found()
+  error('MESON_SKIP_TEST gobject-introspection not found.')
+endif
+
+gnome = import('gnome')
+
+lib = library('foo++', 'foo.cpp')
+gnome.generate_gir(
+  lib,
+  sources: ['foo.cpp', 'foo.h'],
+  namespace: 'foo',
+  nsversion: meson.project_version(),
+)
diff --git a/test cases/frameworks/37 gir cpp/test.json b/test cases/frameworks/37 gir cpp/test.json
new file mode 100644
index 000000000..a9d74fb8a
--- /dev/null
+++ b/test cases/frameworks/37 gir cpp/test.json
@@ -0,0 +1,3 @@
+{
+  "skip_on_jobname": ["azure", "macos", "msys2"]
+}