CROSSTOOL

# This file is largely cargo-culted from:
#   https://github.com/bazelbuild/bazel.git
#   bazel/tools/cpp/CROSSTOOL
#   commit 6b6ff76945c80fb8b11b71d402b5146c85b86859

major_version: "pnacl"
minor_version: ""
default_target_cpu: "pnacl"

default_toolchain {
  cpu: "pnacl"
  toolchain_identifier: "clang_pnacl"
}

# Based heavily on the "local_linux" toolchain from the file mentioned at the
# top.
toolchain {
  abi_version: "pnacl"
  abi_libc_version: "pnacl"
  builtin_sysroot: ""
  compiler: "clang"
  host_system_name: "local"
  needsPic: true
  supports_gold_linker: false
  supports_incremental_linker: false
  supports_fission: false
  supports_interface_shared_objects: false
  supports_normalizing_ar: false
  supports_start_end_lib: false
  supports_thin_archives: false
  target_libc: "pnacl"
  target_cpu: "pnacl"
  target_system_name: "pnacl"
  toolchain_identifier: "clang_pnacl"

  tool_path { name: "ar" path: "external/nacl_sdk/toolchain/linux_pnacl/bin/pnacl-ar" }
  tool_path { name: "compat-ld" path: "external/nacl_sdk/toolchain/linux_pnacl/bin/pnacl-ld" }
  #tool_path { name: "cpp" path: "external/nacl_sdk/toolchain/linux_pnacl/bin/pnacl-cpp" }
  tool_path { name: "cpp" path: "/bin/false" }
  #tool_path { name: "dwp" path: "external/nacl_sdk/toolchain/linux_pnacl/bin/pnacl-dwp" }
  tool_path { name: "gcc" path: "external/nacl_sdk/toolchain/linux_pnacl/bin/pnacl-clang" }
  cxx_flag: "-std=gnu++11"
  linker_flag: "-lc++"
  linker_flag: "-Bexternal/nacl_sdk/toolchain/linux_pnacl/bin"

  # The compiler in the NaCl SDK doesn't support the flags necessary to do
  # strict dependency enforcement (i.e., -no-canonical-prefixes and
  # -fno-canonical-system-headers). So effectively disable the feature in this
  # manner:
  cxx_builtin_include_directory: "/"
  # For reference, here's a path that we would ordinarily want to include:
  #cxx_builtin_include_directory: "external/nacl_sdk/toolchain/linux_pnacl/lib"

  #tool_path { name: "gcov" path: "/usr/bin/gcov" }
  tool_path { name: "gcov" path: "/bin/false" }

  # C(++) compiles invoke the compiler (as that is the one knowing where
  # to find libraries), but we provide LD so other rules can invoke the linker.
  tool_path { name: "ld" path: "external/nacl_sdk/toolchain/linux_pnacl/bin/pnacl-ld" }

  tool_path { name: "nm" path: "external/nacl_sdk/toolchain/linux_pnacl/bin/pnacl-nm" }
  #tool_path { name: "objcopy" path: "/usr/bin/objcopy" }
  #objcopy_embed_flag: "-I"
  #objcopy_embed_flag: "binary"
  #tool_path { name: "objdump" path: "/usr/bin/objdump" }
  tool_path { name: "objdump" path: "/bin/false" }
  tool_path { name: "strip" path: "external/nacl_sdk/toolchain/linux_pnacl/bin/pnacl-strip" }

  # Anticipated future default. (But NaCl SDK doesn't support them.)
  #unfiltered_cxx_flag: "-no-canonical-prefixes"
  #unfiltered_cxx_flag: "-fno-canonical-system-headers"

  # Make C++ compilation deterministic. Use linkstamping instead of these
  # compiler symbols.
  unfiltered_cxx_flag: "-Wno-builtin-macro-redefined"
  unfiltered_cxx_flag: "-D__DATE__=\"redacted\""
  unfiltered_cxx_flag: "-D__TIMESTAMP__=\"redacted\""
  unfiltered_cxx_flag: "-D__TIME__=\"redacted\""

  # The toolchain's includes.
  compiler_flag: "-isystem"
  compiler_flag: "external/nacl_sdk/include/pnacl"

  # Security hardening on by default.
  # Conservative choice; -D_FORTIFY_SOURCE=2 may be unsafe in some cases.
  # We need to undef it before redefining it as some distributions now have
  # it enabled by default.
  compiler_flag: "-U_FORTIFY_SOURCE"
  compiler_flag: "-D_FORTIFY_SOURCE=1"
  compiler_flag: "-fstack-protector"
  #linker_flag: "-Wl,-z,relro,-z,now"

  # Enable coloring even if there's no attached terminal. Bazel removes the
  # escape sequences if --nocolor is specified. This isn't supported by gcc
  # on Ubuntu 14.04.
  # compiler_flag: "-fcolor-diagnostics"

  # All warnings are enabled.
  compiler_flag: "-Wall"
  # All warnings are errors.
  compiler_flag: "-Werror"
  # Would be nice to enable this warning, but then protobufs won't build.
  #compiler_flag: "-Wunused-parameter"
  # But disable some that are problematic.
  #compiler_flag: "-Wno-free-nonheap-object" # has false positives

  # Keep stack frames for debugging, even in opt mode.
  compiler_flag: "-fno-omit-frame-pointer"

  # Anticipated future default.
  #linker_flag: "-no-canonical-prefixes"
  # Have gcc return the exit code from ld.
  #linker_flag: "-pass-exit-codes"
  # Stamp the binary with a unique identifier.
  # Gold linker only? Can we enable this by default?
  # linker_flag: "-Wl,--warn-execstack"
  # linker_flag: "-Wl,--detect-odr-violations"

  # Mosh for Chrome overrides many low-level calls. If the compiler elides
  # those calls, they can't be overridden.
  compiler_flag: "-fno-builtin"

  compilation_mode_flags {
    mode: DBG

    # Enable debug symbols.
    compiler_flag: "-g"
  }

  compilation_mode_flags {
    mode: FASTBUILD

    # See description for this flag in OPT mode.
    # TODO: Remove this once exceptions are fully supported by PNaCl.
    #       NB: Remove this in OPT mode as well.
    linker_flag: "--pnacl-exceptions=sjlj"
  }

  compilation_mode_flags {
    mode: OPT

    # No debug symbols.
    # Maybe we should enable https://gcc.gnu.org/wiki/DebugFission for opt or
    # even generally? However, that can't happen here, as it requires special
    # handling in Bazel.
    compiler_flag: "-g0"

    # Conservative choice for -O
    # -O3 can increase binary size and even slow down the resulting binaries.
    # Profile first and / or use FDO if you need better performance than this.
    compiler_flag: "-O2"
    # Also enable link-time optimizations.
    linker_flag: "-O2"

    # Disable assertions
    # TODO: For some reason, this flag causes the ssh password prompt not to
    # show, and sometimes ssh login will crash! How strange.
    #compiler_flag: "-DNDEBUG"

    # Exceptions are not supported well by PNaCl. Use set-jump/long-jump (not
    # very efficient, but works).
    #
    # We don't do this in debug mode, as it seems to upset the debugger to the
    # point of being useless. Exceptions will therefore abort() in debug
    # builds, unfortunately.
    #
    # TODO: Remove this once exceptions are fully supported by PNaCl.
    #       NB: Remove this in FASTBUILD mode as well.
    linker_flag: "--pnacl-exceptions=sjlj"

    # Removal of unused code and data at link time (can this increase binary size in some cases?).
    compiler_flag: "-ffunction-sections"
    compiler_flag: "-fdata-sections"
    linker_flag: "-Wl,--gc-sections"
  }
  linking_mode_flags { mode: FULLY_STATIC }
}