Export of internal Abseil changes

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bc74316103bbda92541896f588f71c9d45bea768 by Gennadiy Civil <misterg@google.com>:

Manually fixing the BUILD.bazel files

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d41bf9ea916a0dc8c69e6ba77f58f9d55649880e by Shaindel Schwartz <shaindel@google.com>:

Minor cleanup to miscellaneous BUILD files.

PiperOrigin-RevId: 266420157

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08a8dc2cbd48d27e1115809f9ca8d178551cd66e by Gennadiy Civil <misterg@google.com>:

Internal Change
BEGIN_PUBLIC
Internal Change
END_PUBLIC

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8617d58fde1ece40e4aa79eaa5e250b42d19835f by Shaindel Schwartz <shaindel@google.com>:

Internal Change
BEGIN_PUBLIC
Internal Change
END_PUBLIC

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3a0fc7d48bdc70c4f7dffc219578693dea84eb2d by Derek Mauro <dmauro@google.com>:

Implement absl::string_view::at()

PiperOrigin-RevId: 266024644

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ba53a9da8ede8fe7b8971eaab6b3a1fa34763ff6 by Andy Soffer <asoffer@google.com>:

Remove forcing of optimization levels in MSVC.

PiperOrigin-RevId: 265927588

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df86f2046b54bba7da2e345040806d43470de5c0 by Shaindel Schwartz <shaindel@google.com>:

Internal change

PiperOrigin-RevId: 265811077

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e2e3a6e8194363e7c6377672560c806d638a7c74 by Derek Mauro <dmauro@google.com>:

Remove ABI unsafe mixed exceptions mode compilation.
Testing will now be done on CI with the exceptions flag set globally.

PiperOrigin-RevId: 265796079
GitOrigin-RevId: bc74316103bbda92541896f588f71c9d45bea768
Change-Id: Ibccd00f4829520454aa55c4f55c7cb2dc9c6b65a

absl/memory/BUILD.bazel

@@ -1,5 +1,5 @@
 #
-# Copyright 2017 The Abseil Authors.
+# Copyright 2019 The Abseil Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -19,8 +19,6 @@ load(
     "//absl:copts/configure_copts.bzl",
     "ABSL_DEFAULT_COPTS",
     "ABSL_DEFAULT_LINKOPTS",
-    "ABSL_EXCEPTIONS_FLAG",
-    "ABSL_EXCEPTIONS_FLAG_LINKOPTS",
     "ABSL_TEST_COPTS",
 )
 
@@ -56,10 +54,11 @@ cc_test(
     srcs = [
         "memory_exception_safety_test.cc",
     ],
-    copts = ABSL_TEST_COPTS + ABSL_EXCEPTIONS_FLAG,
-    linkopts = ABSL_EXCEPTIONS_FLAG_LINKOPTS + ABSL_DEFAULT_LINKOPTS,
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
     deps = [
         ":memory",
+        "//absl/base:config",
         "//absl/base:exception_safety_testing",
         "@com_google_googletest//:gtest_main",
     ],

absl/memory/CMakeLists.txt

@@ -47,11 +47,9 @@ absl_cc_test(
     "memory_exception_safety_test.cc"
   COPTS
     ${ABSL_TEST_COPTS}
-    ${ABSL_EXCEPTIONS_FLAG}
-  LINKOPTS
-    ${ABSL_EXCEPTIONS_FLAG_LINKOPTS}
   DEPS
     absl::memory
+    absl::config
     absl::exception_safety_testing
     gmock_main
 )

absl/memory/memory_exception_safety_test.cc

@@ -14,6 +14,10 @@
 
 #include "absl/memory/memory.h"
 
+#include "absl/base/config.h"
+
+#ifdef ABSL_HAVE_EXCEPTIONS
+
 #include "gtest/gtest.h"
 #include "absl/base/internal/exception_safety_testing.h"
 
@@ -50,3 +54,5 @@ TEST(MakeUnique, CheckForLeaks) {
 
 }  // namespace
 }  // namespace absl
+
+#endif  // ABSL_HAVE_EXCEPTIONS