Changes imported from Abseil "staging" branch:

- c77facb7ba7c12d656e213e5d63d7dcd9d1f56ba Present the Writer* methods as an option, rather than an ... by Abseil Team <absl-team@google.com>
  - c6004d718f185868dee2ec48b4de6425399b062d Split exception_safety_testing out into its own cmake rul... by Jon Cohen <cohenjon@google.com>
  - 9aa6fc7b34674472d808ed8021f3b20faea82f78 Downstream https://github.com/abseil/abseil-cpp/pull/69 by Jon Cohen <cohenjon@google.com>
  - 13d340269f284b815cc409d2271099e535f4cba4 Internal change by Jon Cohen <cohenjon@google.com>
  - 51840a9243ac9d47eb3c177398d10bb3341f3230 Fix assertion in conversion from floating point types to ... by Alex Strelnikov <strel@google.com>

GitOrigin-RevId: c77facb7ba7c12d656e213e5d63d7dcd9d1f56ba
Change-Id: I7590561b04a986ffbec7139bb9c3aea319a3b975

absl/base/CMakeLists.txt

@@ -62,7 +62,6 @@ list(APPEND BASE_INTERNAL_HEADERS
 # absl_base main library
 list(APPEND BASE_SRC
   "internal/cycleclock.cc"
-  "internal/exception_safety_testing.cc"
   "internal/raw_logging.cc"
   "internal/spinlock.cc"
   "internal/sysinfo.cc"
@@ -117,6 +116,28 @@ absl_library(
     throw_delegate
 )
 
+if(BUILD_TESTING)
+  # exception-safety testing library
+  set(EXCEPTION_SAFETY_TESTING_SRC "internal/exception_safety_testing.cc")
+  set(EXCEPTION_SAFETY_TESTING_PUBLIC_LIBRARIES
+    ${ABSL_TEST_COMMON_LIBRARIES}
+    absl::base
+    absl::memory
+    absl::meta
+    absl::strings
+    absl::types
+  )
+
+absl_library(
+  TARGET
+    absl_base_internal_exception_safety_testing
+  SOURCES
+    ${EXCEPTION_SAFETY_TESTING_SRC}
+  PUBLIC_LIBRARIES
+    ${EXCEPTION_SAFETY_TESTING_PUBLIC_LIBRARIES}
+)
+endif()
+
 
 # dynamic_annotations library
 set(DYNAMIC_ANNOTATIONS_SRC "dynamic_annotations.cc")