Changes imported from Abseil "staging" branch:

- 0320844dcd8219965647f86db7c6c7296e40e41e Introduce internal macros for inline variable emulation s... by Matt Calabrese <calabrese@google.com>
  - 85197d0105805e6aab3a0a648351cb1582a61be0 Internal change. by Alex Strelnikov <strel@google.com>

GitOrigin-RevId: 0320844dcd8219965647f86db7c6c7296e40e41e
Change-Id: I7dce37f6839ff099462951059a9047c5c9377638

absl/base/CMakeLists.txt

@@ -37,6 +37,7 @@ list(APPEND BASE_INTERNAL_HEADERS
   "internal/exception_safety_testing.h"
   "internal/identity.h"
   "internal/invoke.h"
+  "internal/inline_variable.h"
   "internal/low_level_alloc.h"
   "internal/low_level_scheduling.h"
   "internal/malloc_extension.h"
@@ -214,6 +215,26 @@ absl_test(
 )
 
 
+# test inline_variable_test
+list(APPEND INLINE_VARIABLE_TEST_SRC
+  "internal/inline_variable_testing.h"
+  "inline_variable_test.cc"
+  "inline_variable_test_a.cc"
+  "inline_variable_test_b.cc"
+)
+
+set(INLINE_VARIABLE_TEST_PUBLIC_LIBRARIES absl::base)
+
+absl_test(
+  TARGET
+    inline_variable_test
+  SOURCES
+    ${INLINE_VARIABLE_TEST_SRC}
+  PUBLIC_LIBRARIES
+    ${INLINE_VARIABLE_TEST_PUBLIC_LIBRARIES}
+)
+
+
 # test spinlock_test_common
 set(SPINLOCK_TEST_COMMON_SRC "spinlock_test_common.cc")
 set(SPINLOCK_TEST_COMMON_PUBLIC_LIBRARIES absl::base absl::synchronization)