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Everywhere: Make Lagom build with GCC 13

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GCC 13 was released on 2023-04-26. This commit fixes Lagom build errors
when using an updated host toolchain:
- Adds a workaround for a bug in constraint handling, which made LibJS
  fail to compile: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109683
- Silences the new `-Wdangling-reference` diagnostic globally. It
  produces multiple false positives with no clear way to silence them
  without `#pragmas`.
- Silences `-Wself-move` in `RefPtr` tests as GCC 13 adds this
  previously Clang-exclusive warning.
This commit is contained in:
Daniel Bertalan 2023-05-01 16:59:46 +02:00 committed by Tim Flynn
parent 1422f7f904
commit 00b4976f2c
Notes: sideshowbarker 2024-07-16 21:51:02 +09:00 
Author: https://github.com/BertalanD
Commit: https://github.com/SerenityOS/serenity/commit/00b4976f2c
Pull-request: https://github.com/SerenityOS/serenity/pull/18597
Reviewed-by: https://github.com/kleinesfilmroellchen ✅
3 changed files with 10 additions and 9 deletions
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5
AK/Variant.h
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@ -130,15 +130,16 @@ struct VariantConstructTag {
template<typename T, typename Base>
struct VariantConstructors {
// The pointless `typename Base` constraints are a workaround for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109683
ALWAYS_INLINE VariantConstructors(T&& t)
requires(requires { T(move(t)); })
requires(requires { T(move(t)); typename Base; })
{
internal_cast().clear_without_destruction();
internal_cast().set(move(t), VariantNoClearTag {});
}
ALWAYS_INLINE VariantConstructors(T const& t)
requires(requires { T(t); })
requires(requires { T(t); typename Base; })
{
internal_cast().clear_without_destruction();
internal_cast().set(t, VariantNoClearTag {});

3
Meta/CMake/common_compile_options.cmake
View File

@ -28,4 +28,7 @@ elseif (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
# Only ignore expansion-to-defined for g++, clang's implementation doesn't complain about function-like macros
add_compile_options(-Wno-expansion-to-defined)
add_compile_options(-Wno-literal-suffix)
# FIXME: This warning seems useful but has too many false positives with GCC 13.
add_compile_options(-Wno-dangling-reference)
endif()

11
Tests/AK/TestRefPtr.cpp
View File

@ -97,14 +97,11 @@ TEST_CASE(assign_moved_self)
{
RefPtr<Object> object = adopt_ref(*new Object);
EXPECT_EQ(object->ref_count(), 1u);
#if defined(AK_COMPILER_CLANG)
# pragma clang diagnostic push
# pragma clang diagnostic ignored "-Wself-move"
#endif
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wpragmas"
#pragma GCC diagnostic ignored "-Wself-move"
object = move(object);
#if defined(AK_COMPILER_CLANG)
# pragma clang diagnostic pop
#endif
#pragma GCC diagnostic pop
EXPECT_EQ(object->ref_count(), 1u);
}