Export of internal Abseil changes

--
8bdb2020150ed0fd4a4e520e454dc5f54e33f776 by Eric Fiselier <ericwf@google.com>:

Workaround bug in GCC 9.2 and after.

PiperOrigin-RevId: 291982551

--
47ff4820e595f96c082a90d733725f6882d83e3b by Abseil Team <absl-team@google.com>:

Improve ABSL_ATTRIBUTE_PACKED documentation

Recommend to apply ABSL_ATTRIBUTE_PACKED to structure members instead of to an entire structure because applying this attribute to an entire structure may cause the compiler to generate suboptimal code. It reduces the alignment of the data structure from a value larger than one to one. When applied to a structure, ABSL_ATTRIBUTE_PACKED reduces the alignment of a structure (alignof()) to 1. As a result, the compiler can no longer assume that e.g. uint32 members are aligned on a four byte boundary and hence is forced to use single-byte load and store instructions on CPU architectures that do not support non-aligned loads or stores.

PiperOrigin-RevId: 291977920

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902b7a86f860da699d3a2e5c738be5ef73ede3b4 by Mark Barolak <mbar@google.com>:

Internal change

PiperOrigin-RevId: 291963048

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bb3bd3247e376d53a3080b105f13ec7566d3ae50 by Abseil Team <absl-team@google.com>:

Support the C++17 insert_or_assign() API in btree_map.

PiperOrigin-RevId: 291945474

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ff3b3cfcbbc64f086f95501f48d49426bcde356f by Gennadiy Rozental <rogeeff@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 291861110

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fd465cd9cbbacd3962f67a7346d6462edaddd809 by Derek Mauro <dmauro@google.com>:

Add flaky=1 to beta_distribution_test.

PiperOrigin-RevId: 291757364

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3603adfb59c4128c542b670952cce250d59e1f67 by Derek Mauro <dmauro@google.com>:

Separate the initialization of NumCPUs() and NominalCPUFrequency()

The OSS version of Abseil never needs to call NominalCPUFrequency().
In some configurations, initializing NominalCPUFrequency() requires
spending at least 3ms measuring the CPU frequency. By separating the
initialization from NumCPUs(), which is called in most configurations,
we can save at least 3ms of program startup time.

PiperOrigin-RevId: 291737273

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bea9e4a6bff5a0351d340deab966641867e08c4d by Abseil Team <absl-team@google.com>:

Change the cmake library names not to have a redundant `absl_` prefix.

PiperOrigin-RevId: 291640501

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501b602ef260cd7c8c527342581ceffb3c5b6d4c by Gennadiy Rozental <rogeeff@google.com>:

Introducing benchmark for absl::GetFlag.

PiperOrigin-RevId: 291433394

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4eeaddc788da4b91c272a8adca77ca6dbbbc1d44 by Xiaoyi Zhang <zhangxy@google.com>:

fix: Add support for more ARM processors detection

Import of https://github.com/abseil/abseil-cpp/pull/608

PiperOrigin-RevId: 291420397

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a3087a8e883c5d71de7d9bd4ec8f4db5142dfcf5 by Derek Mauro <dmauro@google.com>:

Removes the flaky raw_hash_set prefetch test

PiperOrigin-RevId: 291197079

--
aad6c2121c102ac36216e771c83227cf3e3bfd66 by Andy Soffer <asoffer@google.com>:

Enable building Abseil as a DLL.
This is currently experimental and unsupported.

This CL does a few things:
1. Adds the ABSL_DLL macro to any class holding a static data member, or to global constants in headers.
2. Adds a whitelist of all files in the DLL and all the build targets that are conglomerated into the DLL.
3. When BUILD_SHARED_LIBS is specified, any build target that would be in the DLL still exists, but we swap out all of it's dependencies so it just depends on abseil_dll

PiperOrigin-RevId: 291192055

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5e888cd6f2a7722805d41f872108a03a84e421c7 by Mark Barolak <mbar@google.com>:

Move absl/strings/internal/escaping.{cc,h} into internal build targets.

This puts absl/strings/internal/escaping.h behind a whitelist and it also resolves https://github.com/abseil/abseil-cpp/issues/604.

PiperOrigin-RevId: 291173320

--
166836d24970da87587c1728036f53f05a28f0af by Eric Fiselier <ericwf@google.com>:

Internal Change.

PiperOrigin-RevId: 291012718

--
996ddb3dffda02440fa93f30ca5d71b14b688875 by Abseil Team <absl-team@google.com>:

Fix shared libraries log spam for built-in types in absl::GetFlag

PiperOrigin-RevId: 290772743
GitOrigin-RevId: 8bdb2020150ed0fd4a4e520e454dc5f54e33f776
Change-Id: I8bf2265dd14ebbace220a1b6b982bb5040ad2a26

11 files changed, 47 insertions, 37 deletions

diff --git a/absl/strings/BUILD.bazel b/absl/strings/BUILD.bazel
index dc7e1bf..d5a362d 100644
--- a/absl/strings/BUILD.bazel
+++ b/absl/strings/BUILD.bazel
@@ -37,7 +37,6 @@ cc_library(
         "internal/charconv_bigint.h",
         "internal/charconv_parse.cc",
         "internal/charconv_parse.h",
-        "internal/escaping.cc",
         "internal/memutil.cc",
         "internal/memutil.h",
         "internal/stl_type_traits.h",
@@ -55,7 +54,6 @@ cc_library(
         "ascii.h",
         "charconv.h",
         "escaping.h",
-        "internal/escaping.h",
         "match.h",
         "numbers.h",
         "str_cat.h",
@@ -85,11 +83,13 @@ cc_library(
 cc_library(
     name = "internal",
     srcs = [
+        "internal/escaping.cc",
         "internal/ostringstream.cc",
         "internal/utf8.cc",
     ],
     hdrs = [
         "internal/char_map.h",
+        "internal/escaping.h",
         "internal/ostringstream.h",
         "internal/resize_uninitialized.h",
         "internal/utf8.h",
@@ -99,6 +99,7 @@ cc_library(
         "//absl/base:config",
         "//absl/base:core_headers",
         "//absl/base:endian",
+        "//absl/base:raw_logging_internal",
         "//absl/meta:type_traits",
     ],
 )
diff --git a/absl/strings/CMakeLists.txt b/absl/strings/CMakeLists.txt
index 36702f7..3feb5e9 100644
--- a/absl/strings/CMakeLists.txt
+++ b/absl/strings/CMakeLists.txt
@@ -38,8 +38,6 @@ absl_cc_library(
     "internal/charconv_bigint.h"
     "internal/charconv_parse.cc"
     "internal/charconv_parse.h"
-    "internal/escaping.cc"
-    "internal/escaping.h"
     "internal/memutil.cc"
     "internal/memutil.h"
     "internal/stl_type_traits.h"
@@ -74,6 +72,8 @@ absl_cc_library(
     strings_internal
   HDRS
     "internal/char_map.h"
+    "internal/escaping.cc"
+    "internal/escaping.h"
     "internal/ostringstream.h"
     "internal/resize_uninitialized.h"
     "internal/utf8.h"
@@ -86,6 +86,7 @@ absl_cc_library(
     absl::config
     absl::core_headers
     absl::endian
+    absl::raw_logging_internal
     absl::type_traits
 )
 
diff --git a/absl/strings/ascii.cc b/absl/strings/ascii.cc
index abea3e4..93bb03e 100644
--- a/absl/strings/ascii.cc
+++ b/absl/strings/ascii.cc
@@ -57,7 +57,7 @@ namespace ascii_internal {
 // of these bits is tightly coupled to this implementation, the individual bits
 // are not named. Note that bitfields for all characters above ASCII 127 are
 // zero-initialized.
-const unsigned char kPropertyBits[256] = {
+ABSL_DLL const unsigned char kPropertyBits[256] = {
     0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0x00
     0x40, 0x68, 0x48, 0x48, 0x48, 0x48, 0x40, 0x40,
     0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0x10
@@ -79,7 +79,7 @@ const unsigned char kPropertyBits[256] = {
 // Array of characters for the ascii_tolower() function. For values 'A'
 // through 'Z', return the lower-case character; otherwise, return the
 // identity of the passed character.
-const char kToLower[256] = {
+ABSL_DLL const char kToLower[256] = {
   '\x00', '\x01', '\x02', '\x03', '\x04', '\x05', '\x06', '\x07',
   '\x08', '\x09', '\x0a', '\x0b', '\x0c', '\x0d', '\x0e', '\x0f',
   '\x10', '\x11', '\x12', '\x13', '\x14', '\x15', '\x16', '\x17',
@@ -117,7 +117,7 @@ const char kToLower[256] = {
 // Array of characters for the ascii_toupper() function. For values 'a'
 // through 'z', return the upper-case character; otherwise, return the
 // identity of the passed character.
-const char kToUpper[256] = {
+ABSL_DLL const char kToUpper[256] = {
   '\x00', '\x01', '\x02', '\x03', '\x04', '\x05', '\x06', '\x07',
   '\x08', '\x09', '\x0a', '\x0b', '\x0c', '\x0d', '\x0e', '\x0f',
   '\x10', '\x11', '\x12', '\x13', '\x14', '\x15', '\x16', '\x17',
diff --git a/absl/strings/ascii.h b/absl/strings/ascii.h
index 792aabe..b46bc71 100644
--- a/absl/strings/ascii.h
+++ b/absl/strings/ascii.h
@@ -56,6 +56,7 @@
 #include <string>
 
 #include "absl/base/attributes.h"
+#include "absl/base/config.h"
 #include "absl/strings/string_view.h"
 
 namespace absl {
@@ -63,13 +64,13 @@ ABSL_NAMESPACE_BEGIN
 namespace ascii_internal {
 
 // Declaration for an array of bitfields holding character information.
-extern const unsigned char kPropertyBits[256];
+ABSL_DLL extern const unsigned char kPropertyBits[256];
 
 // Declaration for the array of characters to upper-case characters.
-extern const char kToUpper[256];
+ABSL_DLL extern const char kToUpper[256];
 
 // Declaration for the array of characters to lower-case characters.
-extern const char kToLower[256];
+ABSL_DLL extern const char kToLower[256];
 
 }  // namespace ascii_internal
 
diff --git a/absl/strings/internal/charconv_bigint.cc b/absl/strings/internal/charconv_bigint.cc
index 860c27b..66f33e7 100644
--- a/absl/strings/internal/charconv_bigint.cc
+++ b/absl/strings/internal/charconv_bigint.cc
@@ -158,12 +158,12 @@ const uint32_t* LargePowerOfFiveData(int i) {
 int LargePowerOfFiveSize(int i) { return 2 * i; }
 }  // namespace
 
-const uint32_t kFiveToNth[14] = {
+ABSL_DLL const uint32_t kFiveToNth[14] = {
     1,     5,      25,      125,     625,      3125,      15625,
     78125, 390625, 1953125, 9765625, 48828125, 244140625, 1220703125,
 };
 
-const uint32_t kTenToNth[10] = {
+ABSL_DLL const uint32_t kTenToNth[10] = {
     1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000,
 };
 
diff --git a/absl/strings/internal/charconv_bigint.h b/absl/strings/internal/charconv_bigint.h
index 108e1eb..999e9ae 100644
--- a/absl/strings/internal/charconv_bigint.h
+++ b/absl/strings/internal/charconv_bigint.h
@@ -20,6 +20,7 @@
 #include <iostream>
 #include <string>
 
+#include "absl/base/config.h"
 #include "absl/strings/ascii.h"
 #include "absl/strings/internal/charconv_parse.h"
 #include "absl/strings/string_view.h"
@@ -33,8 +34,9 @@ constexpr int kMaxSmallPowerOfFive = 13;
 // The largest power that 10 that can be raised to, and still fit in a uint32_t.
 constexpr int kMaxSmallPowerOfTen = 9;
 
-extern const uint32_t kFiveToNth[kMaxSmallPowerOfFive + 1];
-extern const uint32_t kTenToNth[kMaxSmallPowerOfTen + 1];
+ABSL_DLL extern const uint32_t
+    kFiveToNth[kMaxSmallPowerOfFive + 1];
+ABSL_DLL extern const uint32_t kTenToNth[kMaxSmallPowerOfTen + 1];
 
 // Large, fixed-width unsigned integer.
 //
diff --git a/absl/strings/internal/str_format/bind.h b/absl/strings/internal/str_format/bind.h
index 2bf0c08..cf41b19 100644
--- a/absl/strings/internal/str_format/bind.h
+++ b/absl/strings/internal/str_format/bind.h
@@ -122,8 +122,8 @@ class FormatSpecTemplate
 #endif  // ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
 
   template <Conv... C, typename = typename std::enable_if<
-                           sizeof...(C) == sizeof...(Args) &&
-                           AllOf(Contains(ArgumentToConv<Args>(),
+                           AllOf(sizeof...(C) == sizeof...(Args),
+                             Contains(ArgumentToConv<Args>(),
                                           C)...)>::type>
   FormatSpecTemplate(const ExtendedParsedFormat<C...>& pc)  // NOLINT
       : Base(&pc) {}
diff --git a/absl/strings/internal/str_format/extension.h b/absl/strings/internal/str_format/extension.h
index 51d7dd6..0a76403 100644
--- a/absl/strings/internal/str_format/extension.h
+++ b/absl/strings/internal/str_format/extension.h
@@ -17,10 +17,12 @@
 #define ABSL_STRINGS_INTERNAL_STR_FORMAT_EXTENSION_H_
 
 #include <limits.h>
+
 #include <cstddef>
 #include <cstring>
 #include <ostream>
 
+#include "absl/base/config.h"
 #include "absl/base/port.h"
 #include "absl/strings/internal/str_format/output.h"
 #include "absl/strings/string_view.h"
@@ -134,7 +136,7 @@ struct Flags {
   }
 };
 
-struct LengthMod {
+struct ABSL_DLL LengthMod {
  public:
   enum Id : uint8_t {
     h, hh, l, ll, L, j, z, t, q, none
@@ -196,7 +198,7 @@ struct LengthMod {
   X_VAL(n) X_SEP X_VAL(p)
 // clang-format on
 
-struct ConversionChar {
+struct ABSL_DLL ConversionChar {
  public:
   enum Id : uint8_t {
     c, C, s, S,              // text
diff --git a/absl/strings/numbers.cc b/absl/strings/numbers.cc
index a0e5a7f..68c26dd 100644
--- a/absl/strings/numbers.cc
+++ b/absl/strings/numbers.cc
@@ -900,9 +900,10 @@ inline bool safe_uint_internal(absl::string_view text, IntType* value_p,
 namespace numbers_internal {
 
 // Digit conversion.
-ABSL_CONST_INIT const char kHexChar[] = "0123456789abcdef";
+ABSL_CONST_INIT ABSL_DLL const char kHexChar[] =
+    "0123456789abcdef";
 
-ABSL_CONST_INIT const char kHexTable[513] =
+ABSL_CONST_INIT ABSL_DLL const char kHexTable[513] =
     "000102030405060708090a0b0c0d0e0f"
     "101112131415161718191a1b1c1d1e1f"
     "202122232425262728292a2b2c2d2e2f"
@@ -920,7 +921,7 @@ ABSL_CONST_INIT const char kHexTable[513] =
     "e0e1e2e3e4e5e6e7e8e9eaebecedeeef"
     "f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff";
 
-ABSL_CONST_INIT const char two_ASCII_digits[100][2] = {
+ABSL_CONST_INIT ABSL_DLL const char two_ASCII_digits[100][2] = {
     {'0', '0'}, {'0', '1'}, {'0', '2'}, {'0', '3'}, {'0', '4'}, {'0', '5'},
     {'0', '6'}, {'0', '7'}, {'0', '8'}, {'0', '9'}, {'1', '0'}, {'1', '1'},
     {'1', '2'}, {'1', '3'}, {'1', '4'}, {'1', '5'}, {'1', '6'}, {'1', '7'},
diff --git a/absl/strings/numbers.h b/absl/strings/numbers.h
index 6120468..d872cca 100644
--- a/absl/strings/numbers.h
+++ b/absl/strings/numbers.h
@@ -36,6 +36,7 @@
 #include <string>
 #include <type_traits>
 
+#include "absl/base/config.h"
 #include "absl/base/internal/bits.h"
 #ifdef __SSE4_2__
 // TODO(jorg): Remove this when we figure out the right way
@@ -106,9 +107,11 @@ ABSL_NAMESPACE_BEGIN
 namespace numbers_internal {
 
 // Digit conversion.
-extern const char kHexChar[17];    // 0123456789abcdef
-extern const char kHexTable[513];  // 000102030405060708090a0b0c0d0e0f1011...
-extern const char two_ASCII_digits[100][2];  // 00, 01, 02, 03...
+ABSL_DLL extern const char kHexChar[17];  // 0123456789abcdef
+ABSL_DLL extern const char
+    kHexTable[513];  // 000102030405060708090a0b0c0d0e0f1011...
+ABSL_DLL extern const char
+    two_ASCII_digits[100][2];  // 00, 01, 02, 03...
 
 // Writes a two-character representation of 'i' to 'buf'. 'i' must be in the
 // range 0 <= i < 100, and buf must have space for two characters. Example:
diff --git a/absl/strings/string_view.h b/absl/strings/string_view.h
index 4f7dd6b..01965b0 100644
--- a/absl/strings/string_view.h
+++ b/absl/strings/string_view.h
@@ -28,7 +28,19 @@
 #define ABSL_STRINGS_STRING_VIEW_H_
 
 #include <algorithm>
+#include <cassert>
+#include <cstddef>
+#include <cstring>
+#include <iosfwd>
+#include <iterator>
+#include <limits>
+#include <string>
+
 #include "absl/base/config.h"
+#include "absl/base/internal/throw_delegate.h"
+#include "absl/base/macros.h"
+#include "absl/base/optimization.h"
+#include "absl/base/port.h"
 
 #ifdef ABSL_USES_STD_STRING_VIEW
 
@@ -49,19 +61,6 @@ ABSL_NAMESPACE_END
 #define ABSL_INTERNAL_STRING_VIEW_MEMCMP memcmp
 #endif  // ABSL_HAVE_BUILTIN(__builtin_memcmp)
 
-#include <cassert>
-#include <cstddef>
-#include <cstring>
-#include <iosfwd>
-#include <iterator>
-#include <limits>
-#include <string>
-
-#include "absl/base/internal/throw_delegate.h"
-#include "absl/base/macros.h"
-#include "absl/base/optimization.h"
-#include "absl/base/port.h"
-
 namespace absl {
 ABSL_NAMESPACE_BEGIN