import strutils const nimCachePathOverride {.strdefine.} = "" when nimCachePathOverride == "": when defined(release): let nimCachePath = "nimcache/release/" & projectName() else: let nimCachePath = "nimcache/debug/" & projectName() else: let nimCachePath = nimCachePathOverride switch("nimcache", nimCachePath) # `-flto` gives a significant improvement in processing speed, specially hash tree and state transition (basically any CPU-bound code implemented in nim) # With LTO enabled, optimization flags should be passed to both compiler and linker! if defined(release) and not defined(disableLTO): # "-w" is not passed to the compiler during linking, so we need to disable # some warnings by hand. switch("passL", "-Wno-stringop-overflow -Wno-stringop-overread") if defined(macosx): # Clang switch("passC", "-flto=thin") switch("passL", "-flto=thin -Wl,-object_path_lto," & nimCachePath & "/lto") elif defined(linux): switch("passC", "-flto=jobserver") switch("passL", "-flto=jobserver") switch("passC", "-finline-limit=100000") switch("passL", "-finline-limit=100000") else: # On windows, LTO needs more love and attention so "gcc-ar" and "gcc-ranlib" are # used for static libraries. discard # show C compiler warnings if defined(cwarnings): let common_gcc_options = "-Wno-discarded-qualifiers -Wno-incompatible-pointer-types" if defined(windows): put("gcc.options.always", "-mno-ms-bitfields " & common_gcc_options) put("clang.options.always", "-mno-ms-bitfields " & common_gcc_options) else: put("gcc.options.always", common_gcc_options) put("clang.options.always", common_gcc_options) if defined(limitStackUsage): # This limits stack usage of each individual function to 1MB - the option is # available on some GCC versions but not all - run with `-d:limitStackUsage` # and look for .su files in "./build/", "./nimcache/" or $TMPDIR that list the # stack size of each function. switch("passC", "-fstack-usage -Werror=stack-usage=1048576") switch("passL", "-fstack-usage -Werror=stack-usage=1048576") if defined(windows): # disable timestamps in Windows PE headers - https://wiki.debian.org/ReproducibleBuilds/TimestampsInPEBinaries switch("passL", "-Wl,--no-insert-timestamp") # increase stack size switch("passL", "-Wl,--stack,8388608") # https://github.com/nim-lang/Nim/issues/4057 --tlsEmulation:off if defined(i386): # set the IMAGE_FILE_LARGE_ADDRESS_AWARE flag so we can use PAE, if enabled, and access more than 2 GiB of RAM switch("passL", "-Wl,--large-address-aware") # The dynamic Chronicles output currently prevents us from using colors on Windows # because these require direct manipulations of the stdout File object. switch("define", "chronicles_colors=off") # Avoid some rare stack corruption while using exceptions with a SEH-enabled # toolchain: https://github.com/status-im/nimbus-eth2/issues/3121 switch("define", "nimRawSetjmp") # This helps especially for 32-bit x86, which sans SSE2 and newer instructions # requires quite roundabout code generation for cryptography, and other 64-bit # and larger arithmetic use cases, along with register starvation issues. When # engineering a more portable binary release, this should be tweaked but still # use at least -msse2 or -msse3. # # https://github.com/status-im/nimbus-eth2/blob/stable/docs/cpu_features.md#ssse3-supplemental-sse3 # suggests that SHA256 hashing with SSSE3 is 20% faster than without SSSE3, so # given its near-ubiquity in the x86 installed base, it renders a distribution # build more viable on an overall broader range of hardware. # if defined(disableMarchNative): if defined(i386) or defined(amd64): if defined(macosx): # https://support.apple.com/kb/SP777 # "macOS Mojave - Technical Specifications": EOL as of 2021-10 so macOS # users on pre-Nehalem must be running either some Hackintosh, or using # an unsupported macOS version beyond that most recently EOL'd. Nehalem # supports instruction set extensions through SSE4.2 and POPCNT. switch("passC", "-march=nehalem") switch("passL", "-march=nehalem") else: switch("passC", "-mssse3") switch("passL", "-mssse3") elif defined(macosx) and defined(arm64): # Apple's Clang can't handle "-march=native" on M1: https://github.com/status-im/nimbus-eth2/issues/2758 switch("passC", "-mcpu=apple-a14") switch("passL", "-mcpu=apple-a14") else: switch("passC", "-march=native") switch("passL", "-march=native") if defined(windows): # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65782 # ("-fno-asynchronous-unwind-tables" breaks Nim's exception raising, sometimes) switch("passC", "-mno-avx512f") switch("passL", "-mno-avx512f") # omitting frame pointers in nim breaks the GC # https://github.com/nim-lang/Nim/issues/10625 switch("passC", "-fno-omit-frame-pointer") switch("passL", "-fno-omit-frame-pointer") --threads:on --opt:speed --excessiveStackTrace:on # enable metric collection --define:metrics --define:chronicles_line_numbers # These are disabled for release binaries # for heap-usage-by-instance-type metrics and object base-type strings --define:nimTypeNames const currentDir = currentSourcePath()[0 .. ^(len("config.nims") + 1)] switch("define", "nim_compiler_path=" & currentDir & "env.sh nim") switch("define", "withoutPCRE") switch("import", "testutils/moduletests") when not defined(disable_libbacktrace): --define:nimStackTraceOverride switch("import", "libbacktrace") else: --stacktrace:on --linetrace:on var canEnableDebuggingSymbols = true if defined(macosx): # The default open files limit is too low on macOS (512), breaking the # "--debugger:native" build. It can be increased with `ulimit -n 1024`. let openFilesLimitTarget = 1024 var openFilesLimit = 0 try: openFilesLimit = staticExec("ulimit -n").strip(chars = Whitespace + Newlines).parseInt() if openFilesLimit < openFilesLimitTarget: echo "Open files limit too low to enable debugging symbols and lightweight stack traces." echo "Increase it with \"ulimit -n " & $openFilesLimitTarget & "\"" canEnableDebuggingSymbols = false except: echo "ulimit error" # We ignore this resource limit on Windows, where a default `ulimit -n` of 256 # in Git Bash is apparently ignored by the OS, and on Linux where the default of # 1024 is good enough for us. if canEnableDebuggingSymbols: # add debugging symbols and original files and line numbers --debugger:native --define:nimOldCaseObjects # https://github.com/status-im/nim-confutils/issues/9 # `switch("warning[CaseTransition]", "off")` fails with "Error: invalid command line option: '--warning[CaseTransition]'" switch("warning", "CaseTransition:off") # The compiler doth protest too much, methinks, about all these cases where it can't # do its (N)RVO pass: https://github.com/nim-lang/RFCs/issues/230 switch("warning", "ObservableStores:off") # Too many false positives for "Warning: method has lock level , but another method has 0 [LockLevel]" switch("warning", "LockLevel:off") # Useful for Chronos metrics. #--define:chronosFutureTracking # ############################################################ # # No LTO for crypto # # ############################################################ # This applies per-file compiler flags to C files # which do not support {.localPassc: "-fno-lto".} # Unfortunately this is filename based instead of path-based # Assumes GCC # BLST put("server.always", "-fno-lto") put("assembly.always", "-fno-lto") # Secp256k1 put("secp256k1.always", "-fno-lto") # BearSSL - only RNGs put("aesctr_drbg.always", "-fno-lto") put("hmac_drbg.always", "-fno-lto") put("sysrng.always", "-fno-lto") # Miracl - only ECP to derive public key from private key put("ecp_BLS12381.always", "-fno-lto") # ############################################################ # # Spurious warnings # # ############################################################ # sqlite3.c: In function ‘sqlite3SelectNew’: # vendor/nim-sqlite3-abi/sqlite3.c:124500: warning: function may return address of local variable [-Wreturn-local-addr] put("sqlite3.always", "-fno-lto") # -Wno-return-local-addr