mirror of
https://github.com/llvm/llvm-project.git
synced 2025-04-23 20:46:06 +00:00
83ea47acd7
GCC from 11 onwards defaults to -std=gnu++17 for C++ source files. We want to do the same (https://discourse.llvm.org/t/c-objc-switch-to-gnu-17-as-the-default-dialect/64360). Split RUN lines, adjust `-verify`, or add `__cplusplus < 201703L` or `-Wno-dynamic-exception-spec`, so that tests will pass regardless of gnu++14/gnu++17 default. We have a desire to mark a test compatible with multiple language standards. There are ongoing discussions how to add markers in the long term: * https://discourse.llvm.org/t/iterating-lit-run-lines/62596 * https://discourse.llvm.org/t/lit-run-a-run-line-multiple-times-with-different-replacements/64932 As a workaround in the short term, add lit substitutions `%std_cxx98-`, `%std_cxx11-14`, etc. They can be used for tests which work across multiple language standards. If a range has `n` standards, run lit multiple times, with `LIT_CLANG_STD_GROUP=0`, `LIT_CLANG_STD_GROUP=1`, etc to cover all `n` standards. Reviewed By: #clang-language-wg, aaron.ballman Differential Revision: https://reviews.llvm.org/D131464
37 lines
1.0 KiB
C++
37 lines
1.0 KiB
C++
// RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -Wover-aligned %s -isystem %S/Inputs -verify=precxx17 %std_cxx11-14
|
|
// RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -Wover-aligned %s -isystem %S/Inputs -verify %std_cxx17-
|
|
|
|
// expected-no-diagnostics
|
|
|
|
// This test ensures that we still get the warning even if we #include <new>
|
|
// where the header here simulates <new>.
|
|
#include <warn-new-overaligned-3.h>
|
|
|
|
namespace test1 {
|
|
struct Test {
|
|
template <typename T>
|
|
struct SeparateCacheLines {
|
|
T data;
|
|
} __attribute__((aligned(256)));
|
|
|
|
SeparateCacheLines<int> high_contention_data[10];
|
|
};
|
|
|
|
void helper() {
|
|
Test t;
|
|
new Test; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}
|
|
new Test[10]; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}
|
|
}
|
|
}
|
|
|
|
namespace test2 {
|
|
struct helper { int i __attribute__((aligned(256))); };
|
|
|
|
struct Placement {
|
|
Placement() {
|
|
new (d) helper();
|
|
}
|
|
helper *d;
|
|
};
|
|
}
|