Add header warning tests

3 files changed, 71 insertions, 0 deletions

diff --git a/test/headers/.clang-tidy b/test/headers/.clang-tidy
new file mode 100644
index 0000000..7ec81cf
--- /dev/null
+++ b/test/headers/.clang-tidy
@@ -0,0 +1,16 @@
+# Copyright 2020-2025 David Robillard <d@drobilla.net>
+# SPDX-License-Identifier: 0BSD OR ISC
+
+Checks: >
+  *,
+  -*-magic-numbers,
+  -altera-*,
+  -llvmlibc-*,
+CheckOptions:
+  - key:   readability-function-cognitive-complexity.Threshold
+    value: '0'
+  - key:   readability-identifier-length.IgnoredParameterNames
+    value: '^(id)|(x)|(y)$'
+FormatStyle: file
+HeaderFilterRegex: '.*'
+WarningsAsErrors: '*'
diff --git a/test/headers/meson.build b/test/headers/meson.build
new file mode 100644
index 0000000..72d039a
--- /dev/null
+++ b/test/headers/meson.build
@@ -0,0 +1,33 @@
+# Copyright 2020-2025 David Robillard <d@drobilla.net>
+# SPDX-License-Identifier: 0BSD OR ISC
+
+header_c_suppressions = []
+
+if get_option('warning_level') == 'everything'
+  if cc.get_id() == 'clang'
+    if not meson.is_cross_build()
+      header_c_suppressions += ['-Wno-poison-system-directories']
+    endif
+  endif
+endif
+
+test_headers_c_args = header_c_suppressions
+test_headers_c_args += [
+  '-DPUGL_NO_INCLUDE_GL_H',
+  '-DPUGL_NO_INCLUDE_GLU_H',
+]
+
+if vulkan_dep.found()
+  test_headers_c_args += ['-DPUGL_TEST_VULKAN']
+endif
+
+test(
+  'headers',
+  executable(
+    'test_headers_c',
+    files('test_headers.c'),
+    c_args: test_headers_c_args,
+    dependencies: pugl_dep,
+  ),
+  suite: 'unit',
+)
diff --git a/test/headers/test_headers.c b/test/headers/test_headers.c
new file mode 100644
index 0000000..2e109f2
--- /dev/null
+++ b/test/headers/test_headers.c
@@ -0,0 +1,22 @@
+// Copyright 2022-2025 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#include <pugl/attributes.h> // IWYU pragma: keep
+#include <pugl/cairo.h>      // IWYU pragma: keep
+#include <pugl/gl.h>         // IWYU pragma: keep
+#include <pugl/glu.h>        // IWYU pragma: keep
+#include <pugl/pugl.h>       // IWYU pragma: keep
+#include <pugl/stub.h>       // IWYU pragma: keep
+
+#ifdef PUGL_TEST_VULKAN
+#  include <pugl/vulkan.h> // IWYU pragma: keep
+#endif
+
+#ifdef __GNUC__
+__attribute__((const))
+#endif
+int
+main(void)
+{
+  return 0;
+}