Export of internal Abseil changes.
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eb6cc81ef7e89e10fc9df47418af93e22fd116d2 by Abseil Team <absl-team@google.com>:
Workaround clang bug https://bugs.llvm.org/show_bug.cgi?id=38289
PiperOrigin-RevId: 206006290
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509e9829295bfc429b82de42f2e073c756ea5709 by Jon Cohen <cohenjon@google.com>:
Remove make_unique ambiguity when using gcc 4.9 in C++14 mode.
gcc 4.9.4 has __cplusplus at 201300L instead of 201402L when in C++14 mode, I guess indicating incomplete support. Anyways, it causes a problem with this check as in c++14 mode in old gcc we were defining absl::make_unique when std::make_unique was present
PiperOrigin-RevId: 205886589
GitOrigin-RevId: eb6cc81ef7e89e10fc9df47418af93e22fd116d2
Change-Id: I9acf3f3d0fd3b0b46ae099821f3bf21b72c28b2b
diff --git a/absl/memory/memory.h b/absl/memory/memory.h
index c43e156..f207169 100644
--- a/absl/memory/memory.h
+++ b/absl/memory/memory.h
@@ -83,7 +83,11 @@
} // namespace memory_internal
-#if __cplusplus >= 201402L || defined(_MSC_VER)
+// gcc 4.8 has __cplusplus at 201301 but doesn't define make_unique. Other
+// supported compilers either just define __cplusplus as 201103 but have
+// make_unique (msvc), or have make_unique whenever __cplusplus > 201103 (clang)
+#if (__cplusplus > 201103L || defined(_MSC_VER)) && \
+ !(defined(__GNUC__) && __GNUC__ == 4 && __GNUC_MINOR__ == 8)
using std::make_unique;
#else
// -----------------------------------------------------------------------------
diff --git a/absl/strings/internal/str_format/float_conversion.cc b/absl/strings/internal/str_format/float_conversion.cc
index 37952b4..6176db9 100644
--- a/absl/strings/internal/str_format/float_conversion.cc
+++ b/absl/strings/internal/str_format/float_conversion.cc
@@ -153,7 +153,14 @@
template <typename Float, typename Int>
constexpr bool CanFitMantissa() {
- return std::numeric_limits<Float>::digits <= std::numeric_limits<Int>::digits;
+ return
+#if defined(__clang__) && !defined(__SSE3__)
+ // Workaround for clang bug: https://bugs.llvm.org/show_bug.cgi?id=38289
+ // Casting from long double to uint64_t is miscompiled and drops bits.
+ (!std::is_same<Float, long double>::value ||
+ !std::is_same<Int, uint64_t>::value) &&
+#endif
+ std::numeric_limits<Float>::digits <= std::numeric_limits<Int>::digits;
}
template <typename Float>
