Updated backoff to use absl::Random (#27193)

* Replace in-house rand with absl::Random for backoff (#26463)

* Replace in-house rand with absl::Random for backoff

* Run sanity

* Added bscrypt dependency

* Removed ABSL_RANDOM_HWAES_FLAGS

* Remove GCC_WARN_64_TO_32_BIT_CONVERSION = YES

* GCC_WARN_64_TO_32_BIT_CONVERSION to podspec install

BUILD

@@ -851,6 +851,7 @@ grpc_cc_library(
         "absl/base",
         "absl/base:core_headers",
         "absl/memory",
+        "absl/random",
         "absl/status",
         "absl/strings",
         "absl/strings:cord",

CMakeLists.txt

@@ -129,6 +129,7 @@ set(gRPC_ABSL_USED_TARGETS
   absl_endian
   absl_errno_saver
   absl_exponential_biased
+  absl_fast_type_id
   absl_fixed_array
   absl_flat_hash_map
   absl_function_ref
@@ -150,6 +151,29 @@ set(gRPC_ABSL_USED_TARGETS
   absl_memory
   absl_numeric_representation
   absl_optional
+  absl_random_distributions
+  absl_random_internal_distribution_caller
+  absl_random_internal_fast_uniform_bits
+  absl_random_internal_fastmath
+  absl_random_internal_generate_real
+  absl_random_internal_iostream_state_saver
+  absl_random_internal_nonsecure_base
+  absl_random_internal_pcg_engine
+  absl_random_internal_platform
+  absl_random_internal_pool_urbg
+  absl_random_internal_randen
+  absl_random_internal_randen_engine
+  absl_random_internal_randen_hwaes
+  absl_random_internal_randen_hwaes_impl
+  absl_random_internal_randen_slow
+  absl_random_internal_salted_seed_seq
+  absl_random_internal_seed_material
+  absl_random_internal_traits
+  absl_random_internal_uniform_helper
+  absl_random_internal_wide_multiply
+  absl_random_random
+  absl_random_seed_gen_exception
+  absl_random_seed_sequences
   absl_raw_hash_map
   absl_raw_hash_set
   absl_raw_logging_internal
@@ -1424,6 +1448,7 @@ target_link_libraries(gpr
   absl::base
   absl::core_headers
   absl::memory
+  absl::random_random
   absl::status
   absl::cord
   absl::str_format
@@ -7596,6 +7621,7 @@ target_link_libraries(activity_test
   absl::core_headers
   absl::flat_hash_set
   absl::memory
+  absl::random_random
   absl::status
   absl::statusor
   absl::cord
@@ -7947,6 +7973,7 @@ target_link_libraries(arena_promise_test
   absl::base
   absl::core_headers
   absl::memory
+  absl::random_random
   absl::status
   absl::cord
   absl::str_format
@@ -8424,7 +8451,6 @@ target_include_directories(binder_server_test
 target_link_libraries(binder_server_test
   ${_gRPC_PROTOBUF_LIBRARIES}
   ${_gRPC_ALLTARGETS_LIBRARIES}
-  absl::random_random
   grpc++_test_util
 )
 
@@ -9210,6 +9236,7 @@ target_link_libraries(chunked_vector_test
   absl::base
   absl::core_headers
   absl::memory
+  absl::random_random
   absl::status
   absl::cord
   absl::str_format
@@ -9878,6 +9905,7 @@ target_link_libraries(core_configuration_test
   absl::base
   absl::core_headers
   absl::memory
+  absl::random_random
   absl::status
   absl::cord
   absl::str_format
@@ -10124,7 +10152,6 @@ target_include_directories(end2end_binder_transport_test
 target_link_libraries(end2end_binder_transport_test
   ${_gRPC_PROTOBUF_LIBRARIES}
   ${_gRPC_ALLTARGETS_LIBRARIES}
-  absl::random_random
   grpc++_test_util
 )
 
@@ -10678,7 +10705,6 @@ target_include_directories(fake_binder_test
 target_link_libraries(fake_binder_test
   ${_gRPC_PROTOBUF_LIBRARIES}
   ${_gRPC_ALLTARGETS_LIBRARIES}
-  absl::random_random
   grpc_test_util
 )
 
@@ -10936,6 +10962,7 @@ target_link_libraries(for_each_test
   absl::core_headers
   absl::flat_hash_set
   absl::memory
+  absl::random_random
   absl::status
   absl::statusor
   absl::cord
@@ -12678,6 +12705,7 @@ target_link_libraries(latch_test
   absl::base
   absl::core_headers
   absl::memory
+  absl::random_random
   absl::status
   absl::statusor
   absl::cord
@@ -13341,6 +13369,7 @@ target_link_libraries(observable_test
   absl::core_headers
   absl::flat_hash_set
   absl::memory
+  absl::random_random
   absl::status
   absl::statusor
   absl::cord
@@ -13612,6 +13641,7 @@ target_link_libraries(pipe_test
   absl::base
   absl::core_headers
   absl::memory
+  absl::random_random
   absl::status
   absl::statusor
   absl::cord
@@ -17429,7 +17459,7 @@ generate_pkgconfig(
   "gpr"
   "gRPC platform support library"
   "${gRPC_CORE_VERSION}"
-  "absl_base absl_cord absl_core_headers absl_memory absl_optional absl_status absl_str_format absl_strings absl_synchronization absl_time"
+  "absl_base absl_cord absl_core_headers absl_memory absl_optional absl_random_random absl_status absl_str_format absl_strings absl_synchronization absl_time"
   "-lgpr"
   ""
   "gpr.pc")
@@ -17439,7 +17469,7 @@ generate_pkgconfig(
   "gRPC"
   "high performance general RPC framework"
   "${gRPC_CORE_VERSION}"
-  "gpr openssl absl_base absl_bind_front absl_cord absl_core_headers absl_flat_hash_map absl_hash absl_inlined_vector absl_memory absl_optional absl_status absl_statusor absl_str_format absl_strings absl_synchronization absl_time absl_utility absl_variant"
+  "gpr openssl absl_base absl_bind_front absl_cord absl_core_headers absl_flat_hash_map absl_hash absl_inlined_vector absl_memory absl_optional absl_random_random absl_status absl_statusor absl_str_format absl_strings absl_synchronization absl_time absl_utility absl_variant"
   "-lgrpc -laddress_sorting -lre2 -lupb -lcares -lz"
   ""
   "grpc.pc")
@@ -17449,7 +17479,7 @@ generate_pkgconfig(
   "gRPC unsecure"
   "high performance general RPC framework without SSL"
   "${gRPC_CORE_VERSION}"
-  "gpr absl_base absl_bind_front absl_cord absl_core_headers absl_flat_hash_map absl_inlined_vector absl_memory absl_optional absl_status absl_statusor absl_str_format absl_strings absl_synchronization absl_time absl_utility absl_variant"
+  "gpr absl_base absl_bind_front absl_cord absl_core_headers absl_flat_hash_map absl_inlined_vector absl_memory absl_optional absl_random_random absl_status absl_statusor absl_str_format absl_strings absl_synchronization absl_time absl_utility absl_variant"
   "-lgrpc_unsecure"
   ""
   "grpc_unsecure.pc")
@@ -17459,7 +17489,7 @@ generate_pkgconfig(
   "gRPC++"
   "C++ wrapper for gRPC"
   "${gRPC_CPP_VERSION}"
-  "grpc absl_base absl_bind_front absl_cord absl_core_headers absl_flat_hash_map absl_hash absl_inlined_vector absl_memory absl_optional absl_status absl_statusor absl_str_format absl_strings absl_synchronization absl_time absl_utility absl_variant"
+  "grpc absl_base absl_bind_front absl_cord absl_core_headers absl_flat_hash_map absl_hash absl_inlined_vector absl_memory absl_optional absl_random_random absl_status absl_statusor absl_str_format absl_strings absl_synchronization absl_time absl_utility absl_variant"
   "-lgrpc++"
   ""
   "grpc++.pc")
@@ -17469,7 +17499,7 @@ generate_pkgconfig(
   "gRPC++ unsecure"
   "C++ wrapper for gRPC without SSL"
   "${gRPC_CPP_VERSION}"
-  "grpc_unsecure absl_base absl_bind_front absl_cord absl_core_headers absl_flat_hash_map absl_inlined_vector absl_memory absl_optional absl_status absl_statusor absl_str_format absl_strings absl_synchronization absl_time absl_utility absl_variant"
+  "grpc_unsecure absl_base absl_bind_front absl_cord absl_core_headers absl_flat_hash_map absl_inlined_vector absl_memory absl_optional absl_random_random absl_status absl_statusor absl_str_format absl_strings absl_synchronization absl_time absl_utility absl_variant"
   "-lgrpc++_unsecure"
   ""
   "grpc++_unsecure.pc")

Makefile

@@ -34,14 +34,6 @@ ifeq ($(SYSTEM),MINGW64)
 SYSTEM = MINGW32
 endif
 
-# Basic machine detection
-HOST_MACHINE = $(shell uname -m)
-ifeq ($(HOST_MACHINE),x86_64)
-HOST_IS_X86_64 = true
-else
-HOST_IS_X86_64 = false
-endif
-
 MAKEFILE_PATH := $(abspath $(lastword $(MAKEFILE_LIST)))
 ifndef BUILDDIR
 BUILDDIR_ABSOLUTE = $(patsubst %/,%,$(dir $(MAKEFILE_PATH)))
@@ -418,7 +410,7 @@ LDFLAGS += -pthread
 endif
 
 ifeq ($(SYSTEM),MINGW32)
-LIBS = m pthread ws2_32 dbghelp
+LIBS = m pthread ws2_32 dbghelp bcrypt
 LDFLAGS += -pthread
 endif
 
@@ -578,11 +570,6 @@ CPPFLAGS := -Ithird_party/address_sorting/include $(CPPFLAGS)
 
 GRPC_ABSEIL_DEP = $(LIBDIR)/$(CONFIG)/libgrpc_abseil.a
 GRPC_ABSEIL_MERGE_LIBS = $(LIBDIR)/$(CONFIG)/libgrpc_abseil.a
-ifeq ($(HOST_IS_X86_64),true)
-ABSL_RANDOM_HWAES_FLAGS = -maes
-else
-ABSL_RANDOM_HWAES_FLAGS =
-endif
 
 # Setup re2 dependency
 
@@ -2650,6 +2637,17 @@ LIBGRPC_ABSEIL_SRC = \
     third_party/abseil-cpp/absl/hash/internal/low_level_hash.cc \
     third_party/abseil-cpp/absl/numeric/int128.cc \
     third_party/abseil-cpp/absl/profiling/internal/exponential_biased.cc \
+    third_party/abseil-cpp/absl/random/discrete_distribution.cc \
+    third_party/abseil-cpp/absl/random/gaussian_distribution.cc \
+    third_party/abseil-cpp/absl/random/internal/pool_urbg.cc \
+    third_party/abseil-cpp/absl/random/internal/randen.cc \
+    third_party/abseil-cpp/absl/random/internal/randen_detect.cc \
+    third_party/abseil-cpp/absl/random/internal/randen_hwaes.cc \
+    third_party/abseil-cpp/absl/random/internal/randen_round_keys.cc \
+    third_party/abseil-cpp/absl/random/internal/randen_slow.cc \
+    third_party/abseil-cpp/absl/random/internal/seed_material.cc \
+    third_party/abseil-cpp/absl/random/seed_gen_exception.cc \
+    third_party/abseil-cpp/absl/random/seed_sequences.cc \
     third_party/abseil-cpp/absl/status/status.cc \
     third_party/abseil-cpp/absl/status/status_payload_printer.cc \
     third_party/abseil-cpp/absl/status/statusor.cc \
@@ -2714,7 +2712,7 @@ LIBGRPC_ABSEIL_SRC = \
 
 LIBGRPC_ABSEIL_OBJS = $(addprefix $(OBJDIR)/$(CONFIG)/, $(addsuffix .o, $(basename $(LIBGRPC_ABSEIL_SRC))))
 
-$(LIBGRPC_ABSEIL_OBJS): CPPFLAGS += -g $(ABSL_RANDOM_HWAES_FLAGS) -Ithird_party/abseil-cpp
+$(LIBGRPC_ABSEIL_OBJS): CPPFLAGS += -g -Ithird_party/abseil-cpp
 
 $(LIBDIR)/$(CONFIG)/libgrpc_abseil.a:  $(LIBGRPC_ABSEIL_OBJS) 
 	$(E) "[AR]      Creating $@"

build_autogenerated.yaml

@@ -383,6 +383,7 @@ libs:
   - absl/base:base
   - absl/base:core_headers
   - absl/memory:memory
+  - absl/random:random
   - absl/status:status
   - absl/strings:cord
   - absl/strings:str_format
@@ -4434,6 +4435,7 @@ targets:
   - absl/base:core_headers
   - absl/container:flat_hash_set
   - absl/memory:memory
+  - absl/random:random
   - absl/status:status
   - absl/status:statusor
   - absl/strings:cord
@@ -4632,6 +4634,7 @@ targets:
   - absl/base:base
   - absl/base:core_headers
   - absl/memory:memory
+  - absl/random:random
   - absl/status:status
   - absl/strings:cord
   - absl/strings:str_format
@@ -4795,7 +4798,6 @@ targets:
   - test/core/transport/binder/end2end/fake_binder.cc
   - test/cpp/end2end/test_service_impl.cc
   deps:
-  - absl/random:random
   - grpc++_test_util
 - name: binder_transport_test
   gtest: true
@@ -5177,6 +5179,7 @@ targets:
   - absl/base:base
   - absl/base:core_headers
   - absl/memory:memory
+  - absl/random:random
   - absl/status:status
   - absl/strings:cord
   - absl/strings:str_format
@@ -5480,6 +5483,7 @@ targets:
   - absl/base:base
   - absl/base:core_headers
   - absl/memory:memory
+  - absl/random:random
   - absl/status:status
   - absl/strings:cord
   - absl/strings:str_format
@@ -5561,7 +5565,6 @@ targets:
   - test/core/transport/binder/end2end/testing_channel_create.cc
   - test/cpp/end2end/test_service_impl.cc
   deps:
-  - absl/random:random
   - grpc++_test_util
 - name: end2end_test
   gtest: true
@@ -5894,7 +5897,6 @@ targets:
   - test/core/transport/binder/end2end/fake_binder.cc
   - test/core/transport/binder/end2end/fake_binder_test.cc
   deps:
-  - absl/random:random
   - grpc_test_util
   uses_polling: false
 - name: file_watcher_certificate_provider_factory_test
@@ -6056,6 +6058,7 @@ targets:
   - absl/base:core_headers
   - absl/container:flat_hash_set
   - absl/memory:memory
+  - absl/random:random
   - absl/status:status
   - absl/status:statusor
   - absl/strings:cord
@@ -6694,6 +6697,7 @@ targets:
   - absl/base:base
   - absl/base:core_headers
   - absl/memory:memory
+  - absl/random:random
   - absl/status:status
   - absl/status:statusor
   - absl/strings:cord
@@ -7029,6 +7033,7 @@ targets:
   - absl/base:core_headers
   - absl/container:flat_hash_set
   - absl/memory:memory
+  - absl/random:random
   - absl/status:status
   - absl/status:statusor
   - absl/strings:cord
@@ -7197,6 +7202,7 @@ targets:
   - absl/base:base
   - absl/base:core_headers
   - absl/memory:memory
+  - absl/random:random
   - absl/status:status
   - absl/status:statusor
   - absl/strings:cord

build_handwritten.yaml

@@ -165,7 +165,7 @@ configs:
       UBSAN_OPTIONS: halt_on_error=1:print_stacktrace=1:suppressions=test/core/util/ubsan_suppressions.txt
 defaults:
   abseil:
-    CPPFLAGS: -g $(ABSL_RANDOM_HWAES_FLAGS) -Ithird_party/abseil-cpp
+    CPPFLAGS: -g -Ithird_party/abseil-cpp
   ares:
     CFLAGS: -g
     CPPFLAGS: -Ithird_party/cares -Ithird_party/cares/cares -fvisibility=hidden -D_GNU_SOURCE

config.m4

@@ -716,6 +716,17 @@ if test "$PHP_GRPC" != "no"; then
     third_party/abseil-cpp/absl/hash/internal/low_level_hash.cc \
     third_party/abseil-cpp/absl/numeric/int128.cc \
     third_party/abseil-cpp/absl/profiling/internal/exponential_biased.cc \
+    third_party/abseil-cpp/absl/random/discrete_distribution.cc \
+    third_party/abseil-cpp/absl/random/gaussian_distribution.cc \
+    third_party/abseil-cpp/absl/random/internal/pool_urbg.cc \
+    third_party/abseil-cpp/absl/random/internal/randen.cc \
+    third_party/abseil-cpp/absl/random/internal/randen_detect.cc \
+    third_party/abseil-cpp/absl/random/internal/randen_hwaes.cc \
+    third_party/abseil-cpp/absl/random/internal/randen_round_keys.cc \
+    third_party/abseil-cpp/absl/random/internal/randen_slow.cc \
+    third_party/abseil-cpp/absl/random/internal/seed_material.cc \
+    third_party/abseil-cpp/absl/random/seed_gen_exception.cc \
+    third_party/abseil-cpp/absl/random/seed_sequences.cc \
     third_party/abseil-cpp/absl/status/status.cc \
     third_party/abseil-cpp/absl/status/status_payload_printer.cc \
     third_party/abseil-cpp/absl/status/statusor.cc \
@@ -1273,6 +1284,8 @@ if test "$PHP_GRPC" != "no"; then
   PHP_ADD_BUILD_DIR($ext_builddir/third_party/abseil-cpp/absl/hash/internal)
   PHP_ADD_BUILD_DIR($ext_builddir/third_party/abseil-cpp/absl/numeric)
   PHP_ADD_BUILD_DIR($ext_builddir/third_party/abseil-cpp/absl/profiling/internal)
+  PHP_ADD_BUILD_DIR($ext_builddir/third_party/abseil-cpp/absl/random)
+  PHP_ADD_BUILD_DIR($ext_builddir/third_party/abseil-cpp/absl/random/internal)
   PHP_ADD_BUILD_DIR($ext_builddir/third_party/abseil-cpp/absl/status)
   PHP_ADD_BUILD_DIR($ext_builddir/third_party/abseil-cpp/absl/strings)
   PHP_ADD_BUILD_DIR($ext_builddir/third_party/abseil-cpp/absl/strings/internal)

config.w32

@@ -682,6 +682,17 @@ if (PHP_GRPC != "no") {
     "third_party\\abseil-cpp\\absl\\hash\\internal\\low_level_hash.cc " +
     "third_party\\abseil-cpp\\absl\\numeric\\int128.cc " +
     "third_party\\abseil-cpp\\absl\\profiling\\internal\\exponential_biased.cc " +
+    "third_party\\abseil-cpp\\absl\\random\\discrete_distribution.cc " +
+    "third_party\\abseil-cpp\\absl\\random\\gaussian_distribution.cc " +
+    "third_party\\abseil-cpp\\absl\\random\\internal\\pool_urbg.cc " +
+    "third_party\\abseil-cpp\\absl\\random\\internal\\randen.cc " +
+    "third_party\\abseil-cpp\\absl\\random\\internal\\randen_detect.cc " +
+    "third_party\\abseil-cpp\\absl\\random\\internal\\randen_hwaes.cc " +
+    "third_party\\abseil-cpp\\absl\\random\\internal\\randen_round_keys.cc " +
+    "third_party\\abseil-cpp\\absl\\random\\internal\\randen_slow.cc " +
+    "third_party\\abseil-cpp\\absl\\random\\internal\\seed_material.cc " +
+    "third_party\\abseil-cpp\\absl\\random\\seed_gen_exception.cc " +
+    "third_party\\abseil-cpp\\absl\\random\\seed_sequences.cc " +
     "third_party\\abseil-cpp\\absl\\status\\status.cc " +
     "third_party\\abseil-cpp\\absl\\status\\status_payload_printer.cc " +
     "third_party\\abseil-cpp\\absl\\status\\statusor.cc " +
@@ -1388,6 +1399,8 @@ if (PHP_GRPC != "no") {
   FSO.CreateFolder(base_dir+"\\ext\\grpc\\third_party\\abseil-cpp\\absl\\numeric");
   FSO.CreateFolder(base_dir+"\\ext\\grpc\\third_party\\abseil-cpp\\absl\\profiling");
   FSO.CreateFolder(base_dir+"\\ext\\grpc\\third_party\\abseil-cpp\\absl\\profiling\\internal");
+  FSO.CreateFolder(base_dir+"\\ext\\grpc\\third_party\\abseil-cpp\\absl\\random");
+  FSO.CreateFolder(base_dir+"\\ext\\grpc\\third_party\\abseil-cpp\\absl\\random\\internal");
   FSO.CreateFolder(base_dir+"\\ext\\grpc\\third_party\\abseil-cpp\\absl\\status");
   FSO.CreateFolder(base_dir+"\\ext\\grpc\\third_party\\abseil-cpp\\absl\\strings");
   FSO.CreateFolder(base_dir+"\\ext\\grpc\\third_party\\abseil-cpp\\absl\\strings\\internal");

gRPC-C++.podspec

@@ -202,6 +202,7 @@ Pod::Spec.new do |s|
     ss.dependency 'abseil/functional/bind_front', abseil_version
     ss.dependency 'abseil/hash/hash', abseil_version
     ss.dependency 'abseil/memory/memory', abseil_version
+    ss.dependency 'abseil/random/random', abseil_version
     ss.dependency 'abseil/status/status', abseil_version
     ss.dependency 'abseil/status/statusor', abseil_version
     ss.dependency 'abseil/strings/cord', abseil_version

gRPC-Core.podspec

@@ -178,6 +178,7 @@ Pod::Spec.new do |s|
     ss.dependency 'abseil/functional/bind_front', abseil_version
     ss.dependency 'abseil/hash/hash', abseil_version
     ss.dependency 'abseil/memory/memory', abseil_version
+    ss.dependency 'abseil/random/random', abseil_version
     ss.dependency 'abseil/status/status', abseil_version
     ss.dependency 'abseil/status/statusor', abseil_version
     ss.dependency 'abseil/strings/cord', abseil_version

grpc.gemspec

@@ -1359,6 +1359,7 @@ Gem::Specification.new do |s|
   s.files += %w( third_party/abseil-cpp/absl/base/internal/dynamic_annotations.h )
   s.files += %w( third_party/abseil-cpp/absl/base/internal/endian.h )
   s.files += %w( third_party/abseil-cpp/absl/base/internal/errno_saver.h )
+  s.files += %w( third_party/abseil-cpp/absl/base/internal/fast_type_id.h )
   s.files += %w( third_party/abseil-cpp/absl/base/internal/hide_ptr.h )
   s.files += %w( third_party/abseil-cpp/absl/base/internal/identity.h )
   s.files += %w( third_party/abseil-cpp/absl/base/internal/inline_variable.h )
@@ -1466,6 +1467,51 @@ Gem::Specification.new do |s|
   s.files += %w( third_party/abseil-cpp/absl/profiling/internal/exponential_biased.cc )
   s.files += %w( third_party/abseil-cpp/absl/profiling/internal/exponential_biased.h )
   s.files += %w( third_party/abseil-cpp/absl/profiling/internal/sample_recorder.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/bernoulli_distribution.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/beta_distribution.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/discrete_distribution.cc )
+  s.files += %w( third_party/abseil-cpp/absl/random/discrete_distribution.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/distributions.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/exponential_distribution.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/gaussian_distribution.cc )
+  s.files += %w( third_party/abseil-cpp/absl/random/gaussian_distribution.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/distribution_caller.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/fast_uniform_bits.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/fastmath.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/generate_real.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/iostream_state_saver.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/nonsecure_base.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/pcg_engine.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/platform.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/pool_urbg.cc )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/pool_urbg.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/randen.cc )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/randen.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/randen_detect.cc )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/randen_detect.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/randen_engine.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/randen_hwaes.cc )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/randen_hwaes.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/randen_round_keys.cc )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/randen_slow.cc )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/randen_slow.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/randen_traits.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/salted_seed_seq.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/seed_material.cc )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/seed_material.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/traits.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/uniform_helper.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/internal/wide_multiply.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/log_uniform_int_distribution.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/poisson_distribution.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/random.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/seed_gen_exception.cc )
+  s.files += %w( third_party/abseil-cpp/absl/random/seed_gen_exception.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/seed_sequences.cc )
+  s.files += %w( third_party/abseil-cpp/absl/random/seed_sequences.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/uniform_int_distribution.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/uniform_real_distribution.h )
+  s.files += %w( third_party/abseil-cpp/absl/random/zipf_distribution.h )
   s.files += %w( third_party/abseil-cpp/absl/status/internal/status_internal.h )
   s.files += %w( third_party/abseil-cpp/absl/status/internal/statusor_internal.h )
   s.files += %w( third_party/abseil-cpp/absl/status/status.cc )

grpc.gyp

@@ -403,6 +403,7 @@
         'absl/base:base',
         'absl/base:core_headers',
         'absl/memory:memory',
+        'absl/random:random',
         'absl/status:status',
         'absl/strings:cord',
         'absl/strings:str_format',

package.xml

@@ -1361,6 +1361,7 @@
     <file baseinstalldir="/" name="third_party/abseil-cpp/absl/base/internal/dynamic_annotations.h" role="src" />
     <file baseinstalldir="/" name="third_party/abseil-cpp/absl/base/internal/endian.h" role="src" />
     <file baseinstalldir="/" name="third_party/abseil-cpp/absl/base/internal/errno_saver.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/base/internal/fast_type_id.h" role="src" />
     <file baseinstalldir="/" name="third_party/abseil-cpp/absl/base/internal/hide_ptr.h" role="src" />
     <file baseinstalldir="/" name="third_party/abseil-cpp/absl/base/internal/identity.h" role="src" />
     <file baseinstalldir="/" name="third_party/abseil-cpp/absl/base/internal/inline_variable.h" role="src" />
@@ -1468,6 +1469,51 @@
     <file baseinstalldir="/" name="third_party/abseil-cpp/absl/profiling/internal/exponential_biased.cc" role="src" />
     <file baseinstalldir="/" name="third_party/abseil-cpp/absl/profiling/internal/exponential_biased.h" role="src" />
     <file baseinstalldir="/" name="third_party/abseil-cpp/absl/profiling/internal/sample_recorder.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/bernoulli_distribution.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/beta_distribution.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/discrete_distribution.cc" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/discrete_distribution.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/distributions.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/exponential_distribution.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/gaussian_distribution.cc" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/gaussian_distribution.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/distribution_caller.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/fast_uniform_bits.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/fastmath.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/generate_real.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/iostream_state_saver.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/nonsecure_base.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/pcg_engine.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/platform.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/pool_urbg.cc" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/pool_urbg.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/randen.cc" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/randen.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/randen_detect.cc" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/randen_detect.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/randen_engine.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/randen_hwaes.cc" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/randen_hwaes.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/randen_round_keys.cc" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/randen_slow.cc" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/randen_slow.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/randen_traits.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/salted_seed_seq.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/seed_material.cc" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/seed_material.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/traits.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/uniform_helper.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/internal/wide_multiply.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/log_uniform_int_distribution.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/poisson_distribution.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/random.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/seed_gen_exception.cc" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/seed_gen_exception.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/seed_sequences.cc" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/seed_sequences.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/uniform_int_distribution.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/uniform_real_distribution.h" role="src" />
+    <file baseinstalldir="/" name="third_party/abseil-cpp/absl/random/zipf_distribution.h" role="src" />
     <file baseinstalldir="/" name="third_party/abseil-cpp/absl/status/internal/status_internal.h" role="src" />
     <file baseinstalldir="/" name="third_party/abseil-cpp/absl/status/internal/statusor_internal.h" role="src" />
     <file baseinstalldir="/" name="third_party/abseil-cpp/absl/status/status.cc" role="src" />

setup.py

@@ -312,8 +312,9 @@ if not "win32" in sys.platform:
 if "win32" in sys.platform:
     EXTENSION_LIBRARIES += (
         'advapi32',
-        'ws2_32',
+        'bcrypt',
         'dbghelp',
+        'ws2_32',
     )
 if BUILD_WITH_SYSTEM_OPENSSL:
     EXTENSION_LIBRARIES += (

src/core/lib/backoff/backoff.cc

@@ -26,31 +26,7 @@
 
 namespace grpc_core {
 
-namespace {
-
-/* Generate a random number between 0 and 1. We roll our own RNG because seeding
- * rand() modifies a global variable we have no control over. */
-double generate_uniform_random_number(uint32_t* rng_state) {
-  constexpr uint32_t two_raise_31 = uint32_t(1) << 31;
-  *rng_state = (1103515245 * *rng_state + 12345) % two_raise_31;
-  return *rng_state / static_cast<double>(two_raise_31);
-}
-
-double generate_uniform_random_number_between(uint32_t* rng_state, double a,
-                                              double b) {
-  if (a == b) return a;
-  if (a > b) std::swap(a, b);  // make sure a < b
-  const double range = b - a;
-  return a + generate_uniform_random_number(rng_state) * range;
-}
-
-}  // namespace
-
-BackOff::BackOff(const Options& options)
-    : options_(options),
-      rng_state_(static_cast<uint32_t>(gpr_now(GPR_CLOCK_REALTIME).tv_nsec)) {
-  Reset();
-}
+BackOff::BackOff(const Options& options) : options_(options) { Reset(); }
 
 grpc_millis BackOff::NextAttemptTime() {
   if (initial_) {
@@ -60,9 +36,9 @@ grpc_millis BackOff::NextAttemptTime() {
   current_backoff_ = static_cast<grpc_millis>(
       std::min(current_backoff_ * options_.multiplier(),
                static_cast<double>(options_.max_backoff())));
-  const double jitter = generate_uniform_random_number_between(
-      &rng_state_, -options_.jitter() * current_backoff_,
-      options_.jitter() * current_backoff_);
+  const double jitter =
+      absl::Uniform(rand_gen_, -options_.jitter() * current_backoff_,
+                    options_.jitter() * current_backoff_);
   const grpc_millis next_timeout =
       static_cast<grpc_millis>(current_backoff_ + jitter);
   return next_timeout + ExecCtx::Get()->Now();
@@ -73,6 +49,4 @@ void BackOff::Reset() {
   initial_ = true;
 }
 
-void BackOff::SetRandomSeed(uint32_t seed) { rng_state_ = seed; }
-
 }  // namespace grpc_core

src/core/lib/backoff/backoff.h

@@ -21,6 +21,8 @@
 
 #include <grpc/support/port_platform.h>
 
+#include "absl/random/random.h"
+
 #include "src/core/lib/iomgr/exec_ctx.h"
 
 namespace grpc_core {
@@ -41,8 +43,6 @@ class BackOff {
   /// will be the time of the second attempt (rather than the Nth).
   void Reset();
 
-  void SetRandomSeed(unsigned int seed);
-
   class Options {
    public:
     Options& set_initial_backoff(grpc_millis initial_backoff) {
@@ -79,7 +79,7 @@ class BackOff {
 
  private:
   const Options options_;
-  uint32_t rng_state_;
+  absl::BitGen rand_gen_;
   bool initial_;
   /// current delay before retries
   grpc_millis current_backoff_;

src/objective-c/manual_tests/GrpcIosTest.xcodeproj/project.pbxproj

@@ -326,7 +326,6 @@
 					"DEBUG=1",
 					"$(inherited)",
 				);
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
@@ -379,7 +378,6 @@
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;

src/objective-c/manual_tests/Podfile

@@ -41,6 +41,8 @@ post_install do |installer|
         # GPR_UNREACHABLE_CODE causes "Control may reach end of non-void
         # function" warning
         config.build_settings['GCC_WARN_ABOUT_RETURN_TYPE'] = 'NO'
+        # Abseil isn't free from the following warning
+        config.build_settings['GCC_WARN_64_TO_32_BIT_CONVERSION'] = 'NO'
         config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] = '$(inherited) COCOAPODS=1 GRPC_CRONET_WITH_PACKET_COALESCING=1'
       end
     end

src/objective-c/tests/Connectivity/ConnectivityTestingApp.xcodeproj/project.pbxproj

@@ -270,7 +270,6 @@
 					"$(inherited)",
 					"GRPC_CFSTREAM=1",
 				);
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
@@ -319,7 +318,6 @@
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;

src/objective-c/tests/CoreTests/CoreTests.xcodeproj/project.pbxproj

@@ -211,7 +211,6 @@
 					"DEBUG=1",
 					"$(inherited)",
 				);
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
@@ -265,7 +264,6 @@
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;

src/objective-c/tests/Podfile

@@ -77,6 +77,8 @@ post_install do |installer|
         # GPR_UNREACHABLE_CODE causes "Control may reach end of non-void
         # function" warning
         config.build_settings['GCC_WARN_ABOUT_RETURN_TYPE'] = 'NO'
+        # Abseil isn't free from the following warning
+        config.build_settings['GCC_WARN_64_TO_32_BIT_CONVERSION'] = 'NO'
         config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] = '$(inherited) COCOAPODS=1 GRPC_CRONET_WITH_PACKET_COALESCING=1 GRPC_CFSTREAM=1'
       end
     end

src/objective-c/tests/Tests.xcodeproj/project.pbxproj

@@ -1280,7 +1280,6 @@
 				);
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_TREAT_WARNINGS_AS_ERRORS = YES;
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
@@ -1621,7 +1620,6 @@
 				);
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_TREAT_WARNINGS_AS_ERRORS = YES;
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
@@ -1664,7 +1662,6 @@
 				);
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_TREAT_WARNINGS_AS_ERRORS = YES;
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
@@ -1701,7 +1698,6 @@
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_TREAT_WARNINGS_AS_ERRORS = YES;
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;

src/python/grpcio/grpc_core_dependencies.py

@@ -681,6 +681,17 @@ CORE_SOURCE_FILES = [
     'third_party/abseil-cpp/absl/hash/internal/low_level_hash.cc',
     'third_party/abseil-cpp/absl/numeric/int128.cc',
     'third_party/abseil-cpp/absl/profiling/internal/exponential_biased.cc',
+    'third_party/abseil-cpp/absl/random/discrete_distribution.cc',
+    'third_party/abseil-cpp/absl/random/gaussian_distribution.cc',
+    'third_party/abseil-cpp/absl/random/internal/pool_urbg.cc',
+    'third_party/abseil-cpp/absl/random/internal/randen.cc',
+    'third_party/abseil-cpp/absl/random/internal/randen_detect.cc',
+    'third_party/abseil-cpp/absl/random/internal/randen_hwaes.cc',
+    'third_party/abseil-cpp/absl/random/internal/randen_round_keys.cc',
+    'third_party/abseil-cpp/absl/random/internal/randen_slow.cc',
+    'third_party/abseil-cpp/absl/random/internal/seed_material.cc',
+    'third_party/abseil-cpp/absl/random/seed_gen_exception.cc',
+    'third_party/abseil-cpp/absl/random/seed_sequences.cc',
     'third_party/abseil-cpp/absl/status/status.cc',
     'third_party/abseil-cpp/absl/status/status_payload_printer.cc',
     'third_party/abseil-cpp/absl/status/statusor.cc',

templates/Makefile.template

@@ -74,14 +74,6 @@
   SYSTEM = MINGW32
   endif
 
-  # Basic machine detection
-  HOST_MACHINE = $(shell uname -m)
-  ifeq ($(HOST_MACHINE),x86_64)
-  HOST_IS_X86_64 = true
-  else
-  HOST_IS_X86_64 = false
-  endif
-
   MAKEFILE_PATH := $(abspath $(lastword $(MAKEFILE_LIST)))
   ifndef BUILDDIR
   BUILDDIR_ABSOLUTE = $(patsubst %/,%,$(dir $(MAKEFILE_PATH)))
@@ -284,7 +276,7 @@
   endif
 
   ifeq ($(SYSTEM),MINGW32)
-  LIBS = m pthread ws2_32 dbghelp
+  LIBS = m pthread ws2_32 dbghelp bcrypt
   LDFLAGS += -pthread
   endif
 
@@ -441,11 +433,6 @@
 
   GRPC_ABSEIL_DEP = $(LIBDIR)/$(CONFIG)/libgrpc_abseil.a
   GRPC_ABSEIL_MERGE_LIBS = $(LIBDIR)/$(CONFIG)/libgrpc_abseil.a
-  ifeq ($(HOST_IS_X86_64),true)
-  ABSL_RANDOM_HWAES_FLAGS = -maes
-  else
-  ABSL_RANDOM_HWAES_FLAGS =
-  endif
 
   # Setup re2 dependency
 

test/core/backoff/backoff_test.cc

@@ -139,8 +139,6 @@ TEST(BackOffTest, JitterBackOff) {
       .set_max_backoff(max_backoff);
   BackOff backoff(options);
 
-  backoff.SetRandomSeed(0);  // force consistent PRNG
-
   grpc_core::ExecCtx exec_ctx;
   grpc_millis next = backoff.NextAttemptTime();
   EXPECT_EQ(next - grpc_core::ExecCtx::Get()->Now(), initial_backoff);

test/core/iomgr/ios/CFStreamTests/CFStreamTests.xcodeproj/project.pbxproj

@@ -200,7 +200,6 @@
 					"DEBUG=1",
 					"$(inherited)",
 				);
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
@@ -249,7 +248,6 @@
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;

test/core/iomgr/ios/CFStreamTests/Podfile

@@ -28,6 +28,8 @@ post_install do |installer|
         # GPR_UNREACHABLE_CODE causes "Control may reach end of non-void
         # function" warning
         config.build_settings['GCC_WARN_ABOUT_RETURN_TYPE'] = 'NO'
+        # Abseil isn't free from the following warning
+        config.build_settings['GCC_WARN_64_TO_32_BIT_CONVERSION'] = 'NO'
       end
     end
   end

test/cpp/cocoapods/GRPCCppTests.xcodeproj/project.pbxproj

@@ -357,7 +357,6 @@
 					"DEBUG=1",
 					"$(inherited)",
 				);
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
@@ -408,7 +407,6 @@
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;

test/cpp/cocoapods/Podfile

@@ -33,6 +33,8 @@ post_install do |installer|
         # GPR_UNREACHABLE_CODE causes "Control may reach end of non-void
         # function" warning
         config.build_settings['GCC_WARN_ABOUT_RETURN_TYPE'] = 'NO'
+        # Abseil isn't free from the following warning
+        config.build_settings['GCC_WARN_64_TO_32_BIT_CONVERSION'] = 'NO'
         config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] = '$(inherited) COCOAPODS=1 GRPC_CRONET_WITH_PACKET_COALESCING=1'
       end
     end

test/cpp/ios/Podfile

@@ -51,6 +51,8 @@ post_install do |installer|
         # GPR_UNREACHABLE_CODE causes "Control may reach end of non-void
         # function" warning
         config.build_settings['GCC_WARN_ABOUT_RETURN_TYPE'] = 'NO'
+        # Abseil isn't free from the following warning
+        config.build_settings['GCC_WARN_64_TO_32_BIT_CONVERSION'] = 'NO'
         config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] = '$(inherited) COCOAPODS=1 GRPC_CRONET_WITH_PACKET_COALESCING=1'
       end
     end

test/cpp/ios/Tests.xcodeproj/project.pbxproj

@@ -270,7 +270,6 @@
 				);
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_TREAT_WARNINGS_AS_ERRORS = YES;
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
@@ -470,7 +469,6 @@
 				);
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_TREAT_WARNINGS_AS_ERRORS = YES;
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
@@ -513,7 +511,6 @@
 				);
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_TREAT_WARNINGS_AS_ERRORS = YES;
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
@@ -550,7 +547,6 @@
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_TREAT_WARNINGS_AS_ERRORS = YES;
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;