diff options
Diffstat (limited to 'www-client/chromium/files/chromium-79-gcc-alignas.patch')
| -rw-r--r-- | www-client/chromium/files/chromium-79-gcc-alignas.patch | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/www-client/chromium/files/chromium-79-gcc-alignas.patch b/www-client/chromium/files/chromium-79-gcc-alignas.patch new file mode 100644 index 000000000000..f7f1fe7ac5bc --- /dev/null +++ b/www-client/chromium/files/chromium-79-gcc-alignas.patch @@ -0,0 +1,108 @@ +Re-use chromium alignas workaround in protobuf. +--- + +diff --git a/third_party/protobuf/src/google/protobuf/port_def.inc b/third_party/protobuf/src/google/protobuf/port_def.inc +index f1bd85d..9c204a1 100644 +--- a/third_party/protobuf/src/google/protobuf/port_def.inc ++++ b/third_party/protobuf/src/google/protobuf/port_def.inc +@@ -528,6 +528,35 @@ PROTOBUF_EXPORT_TEMPLATE_TEST(DEFAULT, __declspec(dllimport)); + #undef IN + #endif // _MSC_VER + ++// Specify memory alignment for structs, classes, etc. ++// Use like: ++// class PROTOBUF_ALIGNAS(16) MyClass { ... } ++// PROTOBUF_ALIGNAS(16) int array[4]; ++// ++// In most places you can use the C++11 keyword "alignas", which is preferred. ++// ++// But compilers have trouble mixing __attribute__((...)) syntax with ++// alignas(...) syntax. ++// ++// Doesn't work in clang or gcc: ++// struct alignas(16) __attribute__((packed)) S { char c; }; ++// Works in clang but not gcc: ++// struct __attribute__((packed)) alignas(16) S2 { char c; }; ++// Works in clang and gcc: ++// struct alignas(16) S3 { char c; } __attribute__((packed)); ++// ++// There are also some attributes that must be specified *before* a class ++// definition: visibility (used for exporting functions/classes) is one of ++// these attributes. This means that it is not possible to use alignas() with a ++// class that is marked as exported. ++#if defined(_MSC_VER) ++#define PROTOBUF_ALIGNAS(byte_alignment) __declspec(align(byte_alignment)) ++#elif defined(__GNUC__) ++#define PROTOBUF_ALIGNAS(byte_alignment) __attribute__((aligned(byte_alignment))) ++#else ++#define PROTOBUF_ALIGNAS(byte_alignment) alignas(byte_alignment) ++#endif ++ + #if defined(__clang__) + #pragma clang diagnostic push + // TODO(gerbens) ideally we cleanup the code. But a cursory try shows many +diff --git a/third_party/protobuf/src/google/protobuf/arena.h b/third_party/protobuf/src/google/protobuf/arena.h +index dedc221..a8515ce 100644 +--- a/third_party/protobuf/src/google/protobuf/arena.h ++++ b/third_party/protobuf/src/google/protobuf/arena.h +@@ -245,7 +245,7 @@ struct ArenaOptions { + // well as protobuf container types like RepeatedPtrField and Map. The protocol + // is internal to protobuf and is not guaranteed to be stable. Non-proto types + // should not rely on this protocol. +-class PROTOBUF_EXPORT alignas(8) Arena final { ++class PROTOBUF_EXPORT PROTOBUF_ALIGNAS(8) Arena final { + public: + // Arena constructor taking custom options. See ArenaOptions below for + // descriptions of the options available. +diff --git a/third_party/protobuf/src/google/protobuf/port_def.inc b/third_party/protobuf/src/google/protobuf/port_def.inc +index f1bd85d..6d02b53 100644 +--- a/third_party/protobuf/src/google/protobuf/port_def.inc ++++ b/third_party/protobuf/src/google/protobuf/port_def.inc +@@ -528,6 +528,35 @@ PROTOBUF_EXPORT_TEMPLATE_TEST(DEFAULT, __declspec(dllimport)); + #undef IN + #endif // _MSC_VER + ++// Specify memory alignment for structs, classes, etc. ++// Use like: ++// class PROTOBUF_ALIGNAS(16) MyClass { ... } ++// PROTOBUF_ALIGNAS(16) int array[4]; ++// ++// In most places you can use the C++11 keyword "alignas", which is preferred. ++// ++// But compilers have trouble mixing __attribute__((...)) syntax with ++// alignas(...) syntax. ++// ++// Doesn't work in clang or gcc: ++// struct alignas(16) __attribute__((packed)) S { char c; }; ++// Works in clang but not gcc: ++// struct __attribute__((packed)) alignas(16) S2 { char c; }; ++// Works in clang and gcc: ++// struct alignas(16) S3 { char c; } __attribute__((packed)); ++// ++// There are also some attributes that must be specified *before* a class ++// definition: visibility (used for exporting functions/classes) is one of ++// these attributes. This means that it is not possible to use alignas() with a ++// class that is marked as exported. ++#if defined(_MSC_VER) ++#define PROTOBUF_ALIGNAS(byte_alignment) __declspec(align(byte_alignment)) ++#elif defined(__GNUC__) ++#define PROTOBUF_ALIGNAS(byte_alignment) __attribute__((aligned(byte_alignment))) ++#else ++#define PROTOBUF_ALIGNAS(byte_alignment) alignas(byte_alignment) ++#endif ++ + #if defined(__clang__) + #pragma clang diagnostic push + // TODO(gerbens) ideally we cleanup the code. But a cursory try shows many +diff --git a/third_party/protobuf/src/google/protobuf/port_undef.inc b/third_party/protobuf/src/google/protobuf/port_undef.inc +index b7e67fe..ba1fffc 100644 +--- a/third_party/protobuf/src/google/protobuf/port_undef.inc ++++ b/third_party/protobuf/src/google/protobuf/port_undef.inc +@@ -80,6 +80,7 @@ + #undef PROTOBUF_EXPORT_TEMPLATE_STYLE_MATCH_foj3FJo5StF0OvIzl7oMxA__declspec + #undef PROTOBUF_EXPORT_TEMPLATE_STYLE_MATCH_DECLSPEC_dllexport + #undef PROTOBUF_EXPORT_TEMPLATE_STYLE_MATCH_DECLSPEC_dllimport ++#undef PROTOBUF_ALIGNAS + + + |