Separate C++ build tests to avoid C/C++ warning clashes

5 files changed, 269 insertions, 0 deletions

diff --git a/test/cpp/.clang-tidy b/test/cpp/.clang-tidy
new file mode 100644
index 0000000..1d936a2
--- /dev/null
+++ b/test/cpp/.clang-tidy
@@ -0,0 +1,38 @@
+# Copyright 2020-2025 David Robillard <d@drobilla.net>
+# SPDX-License-Identifier: 0BSD OR ISC
+
+Checks: >
+  -*-use-auto,
+  -*-use-nullptr,
+  -bugprone-easily-swappable-parameters,
+  -cert-dcl50-cpp,
+  -cppcoreguidelines-avoid-c-arrays,
+  -cppcoreguidelines-avoid-do-while,
+  -cppcoreguidelines-macro-usage,
+  -cppcoreguidelines-no-malloc,
+  -cppcoreguidelines-owning-memory,
+  -cppcoreguidelines-pro-bounds-array-to-pointer-decay,
+  -cppcoreguidelines-pro-bounds-constant-array-index,
+  -cppcoreguidelines-pro-bounds-pointer-arithmetic,
+  -cppcoreguidelines-pro-type-cstyle-cast,
+  -cppcoreguidelines-pro-type-member-init,
+  -cppcoreguidelines-pro-type-union-access,
+  -cppcoreguidelines-pro-type-vararg,
+  -google-readability-casting,
+  -google-runtime-int,
+  -hicpp-avoid-c-arrays,
+  -hicpp-member-init,
+  -hicpp-named-parameter,
+  -hicpp-no-array-decay,
+  -hicpp-no-malloc,
+  -hicpp-vararg,
+  -misc-use-anonymous-namespace,
+  -modernize-avoid-c-arrays,
+  -modernize-loop-convert,
+  -modernize-loop-convert,
+  -modernize-redundant-void-arg,
+  -modernize-use-trailing-return-type,
+  -modernize-use-using,
+  -performance-enum-size,
+  -readability-named-parameter,
+InheritParentConfig: true
diff --git a/test/cpp/meson.build b/test/cpp/meson.build
new file mode 100644
index 0000000..73e2320
--- /dev/null
+++ b/test/cpp/meson.build
@@ -0,0 +1,106 @@
+# Copyright 2021-2025 David Robillard <d@drobilla.net>
+# SPDX-License-Identifier: 0BSD OR ISC
+
+test_cpp_args = []
+if get_option('warning_level') == 'everything' and is_variable('cpp')
+  if cpp.get_id() == 'clang'
+    test_cpp_args += [
+      '-Wno-documentation', # Cairo
+      '-Wno-documentation-unknown-command', # Cairo
+      '-Wno-old-style-cast',
+    ]
+  endif
+
+  test_cpp_args = cpp.get_supported_arguments(test_cpp_args)
+endif
+
+unified_args = core_args
+unified_deps = [core_deps]
+if cairo_dep.found()
+  unified_args += ['-DWITH_CAIRO']
+  unified_deps += [cairo_dep]
+endif
+
+if opengl_dep.found()
+  unified_args += ['-DWITH_OPENGL']
+  unified_deps += [opengl_dep]
+endif
+
+if vulkan_dep.found()
+  unified_args += ['-DWITH_VULKAN']
+  unified_deps += [vulkan_deps]
+endif
+
+if host_machine.system() == 'darwin'
+  add_languages(['objcpp'], native: false)
+
+  objcpp = meson.get_compiler('objcpp')
+
+  objcpp_unified_args = unified_args
+  if objcpp.get_id() == 'clang'
+    objcpp_unified_args += [
+      '-Wno-c++98-compat',
+      '-Wno-c++98-compat-pedantic',
+      '-Wno-deprecated-declarations',
+      '-Wno-direct-ivar-access',
+    ]
+  endif
+
+  objcpp_unified_args = objcpp.get_supported_arguments(objcpp_unified_args)
+
+  test(
+    'inline_objcpp',
+    executable(
+      'test_inline_objcpp',
+      'test_inline_objcpp.mm',
+      dependencies: unified_deps,
+      include_directories: include_directories('../../include'),
+      objcpp_args: objcpp_unified_args,
+    ),
+    suite: 'unit',
+  )
+
+elif is_variable('cpp')
+  cpp_unified_args = unified_args
+  if cpp.get_id() == 'clang'
+    cpp_unified_args += [
+      '-Wno-old-style-cast',
+      '-Wno-switch-default',
+      '-Wno-switch-enum',
+      '-Wno-unused-macros', # Mac
+    ]
+    if host_machine.system() == 'windows'
+      cpp_unified_args += [
+        '-Wno-cast-function-type',
+        '-Wno-deprecated-declarations',
+        '-Wno-nonportable-system-include-path',
+      ]
+    endif
+  elif cpp.get_id() == 'gcc'
+    cpp_unified_args += [
+      '-Wno-conditionally-supported',
+      '-Wno-old-style-cast',
+      '-Wno-switch-default',
+      '-Wno-switch-enum',
+      '-Wno-useless-cast',
+    ]
+  elif cpp.get_id() == 'msvc'
+    cpp_unified_args += [
+      '/wd4464', # relative include path contains '..'
+    ]
+  endif
+
+  cpp_unified_args = cpp.get_supported_arguments(cpp_unified_args)
+
+  test(
+    'inline_cpp',
+    executable(
+      'test_inline_cpp',
+      'test_inline_cpp.cpp',
+      cpp_args: cpp_unified_args,
+      dependencies: unified_deps,
+      include_directories: include_directories('../../include'),
+    ),
+    suite: 'unit',
+  )
+endif
diff --git a/test/cpp/test_build.cpp b/test/cpp/test_build.cpp
new file mode 100644
index 0000000..4fd2dac
--- /dev/null
+++ b/test/cpp/test_build.cpp
@@ -0,0 +1,20 @@
+// Copyright 2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+/*
+  Tests that C++ headers compile without any warnings.
+*/
+
+#define PUGL_DISABLE_DEPRECATED
+
+#include "pugl/cairo.hpp" // IWYU pragma: keep
+#include "pugl/gl.hpp"    // IWYU pragma: keep
+#include "pugl/pugl.h"    // IWYU pragma: keep
+#include "pugl/pugl.hpp"  // IWYU pragma: keep
+#include "pugl/stub.hpp"  // IWYU pragma: keep
+
+int
+main()
+{
+  return 0;
+}
diff --git a/test/cpp/test_inline_cpp.cpp b/test/cpp/test_inline_cpp.cpp
new file mode 100644
index 0000000..f5694eb
--- /dev/null
+++ b/test/cpp/test_inline_cpp.cpp
@@ -0,0 +1,67 @@
+// Copyright 2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+// Tests that the implementation compiles as included C++
+
+#define PUGL_API
+
+#if defined(__clang__)
+#  pragma clang diagnostic push
+#  pragma clang diagnostic ignored "-Wmissing-field-initializers"
+#  pragma clang diagnostic ignored "-Wold-style-cast"
+#  pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"
+#  if __has_warning("-Wreserved-identifier")
+#    pragma clang diagnostic ignored "-Wreserved-identifier"
+#  endif
+#elif defined(__GNUC__)
+#  pragma GCC diagnostic push
+#  pragma GCC diagnostic ignored "-Wconversion"
+#  pragma GCC diagnostic ignored "-Wmissing-field-initializers"
+#  pragma GCC diagnostic ignored "-Wredundant-tags"
+#  pragma GCC diagnostic ignored "-Wsuggest-attribute=const"
+#  pragma GCC diagnostic ignored "-Wsuggest-attribute=pure"
+#  pragma GCC diagnostic ignored "-Wzero-as-null-pointer-constant"
+#endif
+
+#include "../src/common.c"   // IWYU pragma: keep
+#include "../src/internal.c" // IWYU pragma: keep
+
+#if defined(_WIN32)
+#  include "../src/win.c"      // IWYU pragma: keep
+#  include "../src/win.h"      // IWYU pragma: keep
+#  include "../src/win_stub.c" // IWYU pragma: keep
+#  if defined(WITH_CAIRO)
+#    include "../src/win_cairo.c" // IWYU pragma: keep
+#  endif
+#  if defined(WITH_OPENGL)
+#    include "../src/win_gl.c" // IWYU pragma: keep
+#  endif
+#  if defined(WITH_VULKAN)
+#    include "../src/win_vulkan.c" // IWYU pragma: keep
+#  endif
+
+#else
+#  include "../src/x11.c"      // IWYU pragma: keep
+#  include "../src/x11_stub.c" // IWYU pragma: keep
+#  if defined(WITH_CAIRO)
+#    include "../src/x11_cairo.c" // IWYU pragma: keep
+#  endif
+#  if defined(WITH_OPENGL)
+#    include "../src/x11_gl.c" // IWYU pragma: keep
+#  endif
+#  if defined(WITH_VULKAN)
+#    include "../src/x11_vulkan.c" // IWYU pragma: keep
+#  endif
+#endif
+
+int
+main()
+{
+  return 0;
+}
+
+#if defined(__clang__)
+#  pragma clang diagnostic pop
+#elif defined(__GNUC__)
+#  pragma GCC diagnostic pop
+#endif
diff --git a/test/cpp/test_inline_objcpp.mm b/test/cpp/test_inline_objcpp.mm
new file mode 100644
index 0000000..1c9079b
--- /dev/null
+++ b/test/cpp/test_inline_objcpp.mm
@@ -0,0 +1,38 @@
+// Copyright 2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+// Tests that the implementation compiles as included ObjC++
+
+#if defined(__clang__)
+#  pragma clang diagnostic push
+#  pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"
+#  pragma clang diagnostic ignored "-Wold-style-cast"
+#endif
+
+#include "../src/common.c"   // IWYU pragma: keep
+#include "../src/internal.c" // IWYU pragma: keep
+#include "../src/mac.h"      // IWYU pragma: keep
+#include "../src/mac.m"      // IWYU pragma: keep
+#include "../src/mac_stub.m" // IWYU pragma: keep
+
+#if defined(WITH_CAIRO)
+#  include "../src/mac_cairo.m" // IWYU pragma: keep
+#endif
+
+#if defined(WITH_OPENGL)
+#  include "../src/mac_gl.m" // IWYU pragma: keep
+#endif
+
+#if defined(WITH_VULKAN)
+#  include "../src/mac_vulkan.m" // IWYU pragma: keep
+#endif
+
+#if defined(__clang__)
+#  pragma clang diagnostic pop
+#endif
+
+int
+main(void)
+{
+  return 0;
+}