e24734f843
Summary: After https://github.com/facebook/rocksdb/issues/9515 added a unique_ptr to Status, we see some warnings-as-error in some internal builds like this: ``` stderr: rocksdb/src/db/compaction/compaction_job.cc:2839:7: error: offset of on non-standard-layout type 'struct CompactionServiceResult' [-Werror,-Winvalid-offsetof] {offsetof(struct CompactionServiceResult, status), ^ ~~~~~~ ``` I see three potential solutions to resolving this: * Expand our use of an idiom that works around the warning (see offset_of functions removed in this change, inspired by https://gist.github.com/graphitemaster/494f21190bb2c63c5516) However, this construction is invoking undefined behavior that assumes consistent layout with no compiler-introduced indirection. A compiler incompatible with our assumptions will likely compile the code and exhibit undefined behavior. * Migrate to something in place of offset, like a function mapping CompactionServiceResult* to Status* (for the `status` field). This might be required in the long term. * **Selected:** Use our new C++17 dependency to use offsetof in a well-defined way when the compiler allows it. From a comment on https://gist.github.com/graphitemaster/494f21190bb2c63c5516: > A final note: in C++17, offsetof is conditionally supported, which > means that you can use it on any type (not just standard layout > types) and the compiler will error if it can't compile it correctly. > That appears to be the best option if you can live with C++17 and > don't need constexpr support. The C++17 semantics are confirmed on https://en.cppreference.com/w/cpp/types/offsetof, so we can suppress the warning as long as we accept that we might run into a compiler that rejects the code, and at that point we will find a solution, such as the more intrusive "migrate" solution above. Although this is currently only showing in our buck build, it will surely show up also with make and cmake, so I have updated those configurations as well. Also in the buck build, -Wno-expansion-to-defined does not appear to be needed anymore (both current compiler configurations) so I removed it. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9563 Test Plan: Tried out buck builds with both current compiler configurations Reviewed By: riversand963 Differential Revision: D34220931 Pulled By: pdillinger fbshipit-source-id: d39436008259bd1eaaa87c77be69fb2a5b559e1f
235 lines
6.2 KiB
Python
235 lines
6.2 KiB
Python
# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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from __future__ import unicode_literals
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rocksdb_target_header_template = \
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"""# This file \100generated by:
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#$ python3 buckifier/buckify_rocksdb.py{extra_argv}
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# --> DO NOT EDIT MANUALLY <--
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# This file is a Facebook-specific integration for buck builds, so can
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# only be validated by Facebook employees.
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#
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# @noautodeps @nocodemods
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load("@fbcode_macros//build_defs:auto_headers.bzl", "AutoHeaders")
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load("@fbcode_macros//build_defs:cpp_library.bzl", "cpp_library")
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load(":defs.bzl", "test_binary")
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REPO_PATH = package_name() + "/"
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ROCKSDB_COMPILER_FLAGS_0 = [
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"-fno-builtin-memcmp",
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# Allow offsetof to work on non-standard layout types. Some compiler could
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# completely reject our usage of offsetof, but we will solve that when it
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# happens.
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"-Wno-invalid-offsetof",
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# Added missing flags from output of build_detect_platform
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"-Wnarrowing",
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"-DROCKSDB_NO_DYNAMIC_EXTENSION",
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]
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ROCKSDB_EXTERNAL_DEPS = [
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("bzip2", None, "bz2"),
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("snappy", None, "snappy"),
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("zlib", None, "z"),
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("gflags", None, "gflags"),
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("lz4", None, "lz4"),
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("zstd", None, "zstd"),
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]
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ROCKSDB_OS_DEPS_0 = [
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(
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"linux",
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[
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"third-party//numa:numa",
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"third-party//liburing:uring",
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"third-party//tbb:tbb",
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],
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),
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(
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"macos",
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["third-party//tbb:tbb"],
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),
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]
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ROCKSDB_OS_PREPROCESSOR_FLAGS_0 = [
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(
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"linux",
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[
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"-DOS_LINUX",
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"-DROCKSDB_FALLOCATE_PRESENT",
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"-DROCKSDB_MALLOC_USABLE_SIZE",
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"-DROCKSDB_PTHREAD_ADAPTIVE_MUTEX",
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"-DROCKSDB_RANGESYNC_PRESENT",
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"-DROCKSDB_SCHED_GETCPU_PRESENT",
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"-DROCKSDB_IOURING_PRESENT",
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"-DHAVE_SSE42",
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"-DLIBURING",
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"-DNUMA",
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"-DROCKSDB_PLATFORM_POSIX",
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"-DROCKSDB_LIB_IO_POSIX",
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"-DTBB",
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],
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),
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(
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"macos",
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[
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"-DOS_MACOSX",
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"-DROCKSDB_PLATFORM_POSIX",
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"-DROCKSDB_LIB_IO_POSIX",
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"-DTBB",
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],
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),
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(
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"windows",
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[
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"-DOS_WIN",
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"-DWIN32",
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"-D_MBCS",
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"-DWIN64",
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"-DNOMINMAX",
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],
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),
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]
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ROCKSDB_PREPROCESSOR_FLAGS = [
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"-DROCKSDB_SUPPORT_THREAD_LOCAL",
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# Flags to enable libs we include
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"-DSNAPPY",
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"-DZLIB",
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"-DBZIP2",
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"-DLZ4",
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"-DZSTD",
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"-DZSTD_STATIC_LINKING_ONLY",
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"-DGFLAGS=gflags",
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# Added missing flags from output of build_detect_platform
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"-DROCKSDB_BACKTRACE",
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]
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# Directories with files for #include
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ROCKSDB_INCLUDE_PATHS = [
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"",
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"include",
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]
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ROCKSDB_ARCH_PREPROCESSOR_FLAGS = {{
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"x86_64": [
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"-DHAVE_PCLMUL",
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],
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}}
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build_mode = read_config("fbcode", "build_mode")
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is_opt_mode = build_mode.startswith("opt")
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# -DNDEBUG is added by default in opt mode in fbcode. But adding it twice
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# doesn't harm and avoid forgetting to add it.
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ROCKSDB_COMPILER_FLAGS = ROCKSDB_COMPILER_FLAGS_0 + (["-DNDEBUG"] if is_opt_mode else [])
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sanitizer = read_config("fbcode", "sanitizer")
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# Do not enable jemalloc if sanitizer presents. RocksDB will further detect
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# whether the binary is linked with jemalloc at runtime.
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ROCKSDB_OS_PREPROCESSOR_FLAGS = ROCKSDB_OS_PREPROCESSOR_FLAGS_0 + ([(
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"linux",
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["-DROCKSDB_JEMALLOC"],
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)] if sanitizer == "" else [])
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ROCKSDB_OS_DEPS = ROCKSDB_OS_DEPS_0 + ([(
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"linux",
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["third-party//jemalloc:headers"],
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)] if sanitizer == "" else [])
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ROCKSDB_LIB_DEPS = [
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":rocksdb_lib",
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":rocksdb_test_lib",
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] if not is_opt_mode else [":rocksdb_lib"]
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"""
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library_template = """
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cpp_library(
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name = "{name}",
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srcs = [{srcs}],
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{headers_attr_prefix}headers = {headers},
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arch_preprocessor_flags = ROCKSDB_ARCH_PREPROCESSOR_FLAGS,
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compiler_flags = ROCKSDB_COMPILER_FLAGS,
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include_paths = ROCKSDB_INCLUDE_PATHS,
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link_whole = {link_whole},
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os_deps = ROCKSDB_OS_DEPS,
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os_preprocessor_flags = ROCKSDB_OS_PREPROCESSOR_FLAGS,
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preprocessor_flags = ROCKSDB_PREPROCESSOR_FLAGS,
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exported_deps = [{deps}],
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exported_external_deps = ROCKSDB_EXTERNAL_DEPS{extra_external_deps},
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)
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"""
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rocksdb_library_template = """
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cpp_library(
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name = "{name}",
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srcs = [{srcs}],
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{headers_attr_prefix}headers = {headers},
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arch_preprocessor_flags = ROCKSDB_ARCH_PREPROCESSOR_FLAGS,
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compiler_flags = ROCKSDB_COMPILER_FLAGS,
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include_paths = ROCKSDB_INCLUDE_PATHS,
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os_deps = ROCKSDB_OS_DEPS,
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os_preprocessor_flags = ROCKSDB_OS_PREPROCESSOR_FLAGS,
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preprocessor_flags = ROCKSDB_PREPROCESSOR_FLAGS,
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exported_deps = ROCKSDB_LIB_DEPS,
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exported_external_deps = ROCKSDB_EXTERNAL_DEPS,
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)
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"""
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binary_template = """
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cpp_binary(
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name = "{name}",
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srcs = [{srcs}],
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arch_preprocessor_flags = ROCKSDB_ARCH_PREPROCESSOR_FLAGS,
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compiler_flags = ROCKSDB_COMPILER_FLAGS,
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preprocessor_flags = ROCKSDB_PREPROCESSOR_FLAGS,
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include_paths = ROCKSDB_INCLUDE_PATHS,
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deps = [{deps}],
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external_deps = ROCKSDB_EXTERNAL_DEPS,
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)
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"""
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test_cfg_template = """ [
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"%s",
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"%s",
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"%s",
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%s,
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%s,
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],
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"""
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unittests_template = """
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# [test_name, test_src, test_type, extra_deps, extra_compiler_flags]
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ROCKS_TESTS = [
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{tests}]
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# Generate a test rule for each entry in ROCKS_TESTS
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# Do not build the tests in opt mode, since SyncPoint and other test code
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# will not be included.
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[
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cpp_unittest(
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name = test_name,
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srcs = [test_cc],
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arch_preprocessor_flags = ROCKSDB_ARCH_PREPROCESSOR_FLAGS,
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compiler_flags = ROCKSDB_COMPILER_FLAGS + extra_compiler_flags,
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include_paths = ROCKSDB_INCLUDE_PATHS,
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os_preprocessor_flags = ROCKSDB_OS_PREPROCESSOR_FLAGS,
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preprocessor_flags = ROCKSDB_PREPROCESSOR_FLAGS,
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deps = [":rocksdb_test_lib"] + extra_deps,
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external_deps = ROCKSDB_EXTERNAL_DEPS + [
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("googletest", None, "gtest"),
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],
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)
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for test_name, test_cc, parallelism, extra_deps, extra_compiler_flags in ROCKS_TESTS
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if not is_opt_mode
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]
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"""
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