Export of internal Abseil changes.

--
5a5dba4252e764e6737070bf0a31074bf23a3b41 by Abseil Team <absl-team@google.com>:

Internal change.

PiperOrigin-RevId: 244898913

--
3eb7d5b445ffbf08a104e39cd15aecf568417333 by Matt Calabrese <calabrese@google.com>:

Introduce absl::is_trivially_move_constructible and absl::is_trivially_move_assignable, and update the absl::is_trivially_copy_constructible and absl::is_trivially_copy_assignable traits to use similar techniques (should now be closer to the standard behavior).

PiperOrigin-RevId: 244859015

--
7da05a24fa786cab3985de0c39a186d73dcbcfb5 by Abseil Team <absl-team@google.com>:

Fix misspellings in comments in raw_hash_set.h.

PiperOrigin-RevId: 244754700

--
5c057be96048f21473d5ec45005ab4dcd8dd354f by Derek Mauro <dmauro@google.com>:

Internal change

PiperOrigin-RevId: 244744239

--
592394e3c2e98f1238d3fb6fcb0d20c3e3739ba9 by Derek Mauro <dmauro@google.com>:

Limit the raw_hash_set prefetch test to x86-64.

PiperOrigin-RevId: 244737534

--
99ebe4e003633c8ff7838b035b31a827994879ef by Derek Mauro <dmauro@google.com>:

Workaround warning 4091 in an MSVC header.

PiperOrigin-RevId: 244701744

--
0aa23f09a32efe7985ee55b0217190f08da42477 by Abseil Team <absl-team@google.com>:

Fix comment typo.

PiperOrigin-RevId: 244659371

--
c6cdb87e9f28062c8daa29b3d8d68182ecc16383 by Derek Mauro <dmauro@google.com>:

Fix -Wundef warnings and support -Wundef.

PiperOrigin-RevId: 244244968

--
06b81245f7696b20c3c63b0618d33ac25e29cad6 by Abseil Team <absl-team@google.com>:

Fix a typo in inlined_vector.h.

PiperOrigin-RevId: 244230809

--
94877a2125d2cfe837384240e4d6551f39d737e4 by Greg Falcon <gfalcon@google.com>:

Fix sysinfo_test for emscripten.

PiperOrigin-RevId: 244198804

--
ec7783531ef7f9df2da37d341d61f7cb2bf843f0 by Shaindel Schwartz <shaindel@google.com>:

Import of CCTZ from GitHub.

Fixes #291.

PiperOrigin-RevId: 244184598

--
b652c14fa95ea206c217487ee713b11f5d1762b3 by Matt Calabrese <calabrese@google.com>:

Emulate the `in_place_index` and `in_place_type` variable templates such that they are syntactically usable in C++11 with `any` and `variant`. Also pull in the variable templates from namespace std when available.

The main observable differences here are:

1)
The types of `in_place_index_t<I>` and `in_place_type_t<T>` become function pointer types rather than structs when using the implementation that is not an alias of the std equivalents.

2)
The types of `in_place_index<I>` and `in_place_type<T>` are not directly `in_place_index_t<I>` and `in_place_type_t<T>`, but rather they become function types that decay to the corresponding function pointer types.

3)
The default constructor for `in_place_index_t` and `in_place_type_t` instantiations is no longer explicit, but for these templates I think that's less important than for something like `in_place_t` since the _type_t and _index_t versions basically never have their template parameter non-deduced when participating in overload resolution with conflicting candidates.

4) While idiomatic usage of `in_place_type_t` and `in_place_index_t` with std::variant and std::any should not be affected, there is the possibility that strange, non-idiomatic uses may be affected in the wild.

5) Default construction (rather than value-initialization) leads to a default-constructed pointer.

PiperOrigin-RevId: 244180003

--
b9ac5a96581837ffa24532117b7ea302a5569751 by Derek Mauro <dmauro@google.com>:

Fix MSVC debug assertion.

isprint is undefined for values not representable as unsigned char or
EOF.

PiperOrigin-RevId: 244083005

--
41758be6137c2f25e84b50f23938e49484be2903 by Shaindel Schwartz <shaindel@google.com>:

Update config settings for Apple platforms.

PiperOrigin-RevId: 244040587

--
c90df6a26db94b0305a0c954455a621542a89d91 by Abseil Team <absl-team@google.com>:

Internal change

PiperOrigin-RevId: 244024427

--
c71e9ceb89495354eca7d02bd905ffeaa9029aec by Derek Mauro <dmauro@google.com>:

Adds missing ABSL_DEFAULT_COPTS and ABSL_TEST_COPTS to CMakeLists.txt

Don't error on deprecated declarations in tests. It is completely
reasonable to test that code marked deprecated still works.

PiperOrigin-RevId: 244003941

--
e1326a96527a8ba9b8d120161545260da9c4562e by Abseil Team <absl-team@google.com>:

Internal change.

PiperOrigin-RevId: 243990623

--
90b8e12934c7711e1bfcc0117d21288bf9220dee by Abseil Team <absl-team@google.com>:

Add variation of absl::Base64Escape/WebSafeBase64Escape that directly returns its result.

PiperOrigin-RevId: 243894308

--
317fef3344481ebc5c35712d42f5d8a0fa64dff4 by Abseil Team <absl-team@google.com>:

Enable raw logging in Emscripten builds.

PiperOrigin-RevId: 243893705
GitOrigin-RevId: 5a5dba4252e764e6737070bf0a31074bf23a3b41
Change-Id: I19293aab73cc98d9e9bf6a9fdc30819764adb9db

3 files changed, 14 insertions, 6 deletions

diff --git a/absl/copts/GENERATED_AbseilCopts.cmake b/absl/copts/GENERATED_AbseilCopts.cmake
index 5543638c..27e6f5a0 100644
--- a/absl/copts/GENERATED_AbseilCopts.cmake
+++ b/absl/copts/GENERATED_AbseilCopts.cmake
@@ -37,7 +37,6 @@ list(APPEND ABSL_CLANG_CL_FLAGS
     "-Wno-shorten-64-to-32"
     "-Wno-switch-enum"
     "-Wno-thread-safety-negative"
-    "-Wno-undef"
     "-Wno-unknown-warning-option"
     "-Wno-unreachable-code"
     "-Wno-unused-macros"
@@ -62,6 +61,7 @@ list(APPEND ABSL_CLANG_CL_FLAGS
 
 list(APPEND ABSL_CLANG_CL_TEST_FLAGS
     "-Wno-c99-extensions"
+    "-Wno-deprecated-declarations"
     "-Wno-missing-noreturn"
     "-Wno-missing-prototypes"
     "-Wno-missing-variable-declarations"
@@ -103,6 +103,7 @@ list(APPEND ABSL_GCC_FLAGS
 
 list(APPEND ABSL_GCC_TEST_FLAGS
     "-Wno-conversion-null"
+    "-Wno-deprecated-declarations"
     "-Wno-missing-declarations"
     "-Wno-sign-compare"
     "-Wno-unused-function"
@@ -144,7 +145,6 @@ list(APPEND ABSL_LLVM_FLAGS
     "-Wno-shorten-64-to-32"
     "-Wno-switch-enum"
     "-Wno-thread-safety-negative"
-    "-Wno-undef"
     "-Wno-unknown-warning-option"
     "-Wno-unreachable-code"
     "-Wno-unused-macros"
@@ -164,6 +164,7 @@ list(APPEND ABSL_LLVM_FLAGS
 
 list(APPEND ABSL_LLVM_TEST_FLAGS
     "-Wno-c99-extensions"
+    "-Wno-deprecated-declarations"
     "-Wno-missing-noreturn"
     "-Wno-missing-prototypes"
     "-Wno-missing-variable-declarations"
@@ -211,5 +212,6 @@ list(APPEND ABSL_MSVC_TEST_FLAGS
     "/wd4018"
     "/wd4101"
     "/wd4503"
+    "/wd4996"
     "/DNOMINMAX"
 )
diff --git a/absl/copts/GENERATED_copts.bzl b/absl/copts/GENERATED_copts.bzl
index 10caa78a..0feb0f4b 100644
--- a/absl/copts/GENERATED_copts.bzl
+++ b/absl/copts/GENERATED_copts.bzl
@@ -38,7 +38,6 @@ ABSL_CLANG_CL_FLAGS = [
     "-Wno-shorten-64-to-32",
     "-Wno-switch-enum",
     "-Wno-thread-safety-negative",
-    "-Wno-undef",
     "-Wno-unknown-warning-option",
     "-Wno-unreachable-code",
     "-Wno-unused-macros",
@@ -63,6 +62,7 @@ ABSL_CLANG_CL_FLAGS = [
 
 ABSL_CLANG_CL_TEST_FLAGS = [
     "-Wno-c99-extensions",
+    "-Wno-deprecated-declarations",
     "-Wno-missing-noreturn",
     "-Wno-missing-prototypes",
     "-Wno-missing-variable-declarations",
@@ -104,6 +104,7 @@ ABSL_GCC_FLAGS = [
 
 ABSL_GCC_TEST_FLAGS = [
     "-Wno-conversion-null",
+    "-Wno-deprecated-declarations",
     "-Wno-missing-declarations",
     "-Wno-sign-compare",
     "-Wno-unused-function",
@@ -145,7 +146,6 @@ ABSL_LLVM_FLAGS = [
     "-Wno-shorten-64-to-32",
     "-Wno-switch-enum",
     "-Wno-thread-safety-negative",
-    "-Wno-undef",
     "-Wno-unknown-warning-option",
     "-Wno-unreachable-code",
     "-Wno-unused-macros",
@@ -165,6 +165,7 @@ ABSL_LLVM_FLAGS = [
 
 ABSL_LLVM_TEST_FLAGS = [
     "-Wno-c99-extensions",
+    "-Wno-deprecated-declarations",
     "-Wno-missing-noreturn",
     "-Wno-missing-prototypes",
     "-Wno-missing-variable-declarations",
@@ -212,5 +213,6 @@ ABSL_MSVC_TEST_FLAGS = [
     "/wd4018",
     "/wd4101",
     "/wd4503",
+    "/wd4996",
     "/DNOMINMAX",
 ]
diff --git a/absl/copts/copts.py b/absl/copts/copts.py
index cdcf61d6..154c0ce6 100644
--- a/absl/copts/copts.py
+++ b/absl/copts/copts.py
@@ -65,7 +65,6 @@ LLVM_DISABLE_WARNINGS_FLAGS = [
     "-Wno-shorten-64-to-32",
     "-Wno-switch-enum",
     "-Wno-thread-safety-negative",
-    "-Wno-undef",
     "-Wno-unknown-warning-option",
     "-Wno-unreachable-code",
     # Causes warnings on include guards
@@ -89,6 +88,7 @@ LLVM_DISABLE_WARNINGS_FLAGS = [
 
 LLVM_TEST_DISABLE_WARNINGS_FLAGS = [
     "-Wno-c99-extensions",
+    "-Wno-deprecated-declarations",
     "-Wno-missing-noreturn",
     "-Wno-missing-prototypes",
     "-Wno-missing-variable-declarations",
@@ -110,7 +110,9 @@ LLVM_TEST_DISABLE_WARNINGS_FLAGS = [
 ]
 
 MSVC_STYLE_EXCEPTIONS_FLAGS = [
-    "/U_HAS_EXCEPTIONS", "/D_HAS_EXCEPTIONS=1", "/EHsc"
+    "/U_HAS_EXCEPTIONS",
+    "/D_HAS_EXCEPTIONS=1",
+    "/EHsc"
 ]
 
 MSVC_DEFINES = [
@@ -148,6 +150,7 @@ COPT_VARS = {
     ],
     "ABSL_GCC_TEST_FLAGS": [
         "-Wno-conversion-null",
+        "-Wno-deprecated-declarations",
         "-Wno-missing-declarations",
         "-Wno-sign-compare",
         "-Wno-unused-function",
@@ -183,6 +186,7 @@ COPT_VARS = {
         "/wd4018",  # signed/unsigned mismatch
         "/wd4101",  # unreferenced local variable
         "/wd4503",  # decorated name length exceeded, name was truncated
+        "/wd4996",  # use of deprecated symbol
         "/DNOMINMAX",  # disable the min() and max() macros from <windows.h>
     ],
     "ABSL_MSVC_EXCEPTIONS_FLAGS":