diff options
| author |  Abseil Team <absl-team@google.com> | 2021-03-24 18:51:51 -0700 |
|---|---|---|
| committer |  Derek Mauro <dmauro@google.com> | 2021-03-25 11:05:20 -0400 |
| commit | a09b5de0d57d7b2179210989ab63361c3c1894f5 (patch) | |
| tree | 54987b10801ee723d0641e6385e34e2f69feb528 /absl/base/attributes.h | |
| parent | 1fdbe1ea1b8c835c11ed6fbec4d4259ad104f765 (diff) | |
Export of internal Abseil changes
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3de7250f2988e360764479fa590d299a649987c0 by Derek Mauro <dmauro@google.com>:
Make the SOVERSION fit into 16 bits to make the MacOS linker happy
PiperOrigin-RevId: 364939757
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dead27aa0734a89ccb25da807e08e61000a47f8f by Abseil Team <absl-team@google.com>:
Update `ABSL_ATTRIBUTE_UNUSED`'s documentation that `[[maybe_unused]]` in C++17 and up is now the preferred usage solution.
Also document why we can't update `ABSL_ATTRIBUTE_UNUSED` to use `[[maybe_unused]]` (differences in positioning requirements).
PiperOrigin-RevId: 364900016
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0baf1b01dc9a2b5f9869ff5a52a1cf7a032055a3 by Abseil Team <absl-team@google.com>:
Slightly weaken the spec for `absl::string_view::compare` to match C++17.
The Abseil-specific implementation provides a stronger guarantee than required by `std::string_view`, returning +1, 0, or -1. When `absl::string_view` is an alias for `std::string_view`, these are only guaranteed to be positive, zero, and negative. Portable code should not depend on the stronger guarantee.
PiperOrigin-RevId: 364846419
GitOrigin-RevId: 3de7250f2988e360764479fa590d299a649987c0
Change-Id: I7c74004fc38c9f5eaad5b104a993b79518497c5b
Diffstat (limited to 'absl/base/attributes.h')
| -rw-r--r-- | absl/base/attributes.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/absl/base/attributes.h b/absl/base/attributes.h index cf2cb550..4a8581e1 100644 --- a/absl/base/attributes.h +++ b/absl/base/attributes.h @@ -524,6 +524,13 @@ // ABSL_ATTRIBUTE_UNUSED // // Prevents the compiler from complaining about variables that appear unused. +// +// For code or headers that are assured to only build with C++17 and up, prefer +// just using the standard '[[maybe_unused]]' directly over this macro. +// +// Due to differences in positioning requirements between the old, compiler +// specific __attribute__ syntax and the now standard [[maybe_unused]], this +// macro does not attempt to take advantage of '[[maybe_unused]]'. #if ABSL_HAVE_ATTRIBUTE(unused) || (defined(__GNUC__) && !defined(__clang__)) #undef ABSL_ATTRIBUTE_UNUSED #define ABSL_ATTRIBUTE_UNUSED __attribute__((__unused__)) |