Compile with OpenCilk for parallelism, ./gbbs/bridge.h:79:3: error: no template named 'alloc_holder'

[IamwhatIamSY]

Hello!

When I compile BYO with OpenCilk using the Bazel configuration --config=cilk, there comes an error: "./gbbs/bridge.h:79:3: error: no template named 'alloc_holder' ". The following is my bazel build configurations about OpenCilk in file /BYO/.bazelrc:

# Build using OpenCilk for parallelism.
build:cilk --repo_env=CC=clang++
build:cilk --cxxopt=-UHOMEGROWN
build:cilk --cxxopt=-gdwarf-4
build:cilk --cxxopt=-std=c++20
build:cilk --cxxopt=-DCILK
build:cilk --cxxopt=-DPARLAY_OPENCILK
build:cilk --cxxopt=-fopencilk
build:cilk --cxxopt=--gcc-toolchain=/path to gcc11.4/
build:cilk --linkopt=-fopencilk

Could you please give me some suggestions to solve this problem?

Thanks a lot!

[wheatman]

The function that uses alloc_holder is not used by any of the BYO algorithms so the quick answer for now is to comment out that function
parallel_for_alloc in gbbs/bridge.h lines 75 through 87ish

You may then run into some issues with parlay not quite being set up properly with bazel for opencilk.

I needed to add the following rule to external/parlaylib/include/parlay/internal/scheduler_plugins/BUILD

cc_library(
    name = "opencilk",
    hdrs = ["opencilk.h"],
)

Then this rule needs to be referenced in external/parlaylib/include/parlay/BUILD in cc_library parallel (line 68 ish)

add a dependency on the rule we just added

    name = "parallel",
    hdrs = ["parallel.h"],
    deps = [
        ":scheduler",
        "//parlay/internal/scheduler_plugins:cilkplus",
        "//parlay/internal/scheduler_plugins:omp",
        "//parlay/internal/scheduler_plugins:sequential",
        "//parlay/internal/scheduler_plugins:opencilk",
    ],
)