Trying to compile the go-webp package using Bazel. This involves compiling libwebp from sources.

Here’s how I’m retrieving libwebp‘s sources:

# WORKSPACE
git_repository(
    name = "libwebp",
    remote = "https://chromium.googlesource.com/webm/libwebp",
    commit = "9ce982fdf21764ef7b273f91d6d72721656c3e03",
    build_file = "//:bazel/libwebp/BUILD.bazel",
)

# //:bazel/libwebp/BUILD.bazel
filegroup(
    name = "srcs",
    srcs = glob(
        ["**/*"],
        # https://github.com/bazelbuild/rules_foreign_cc/issues/1034#issuecomment-2009876928
        exclude = ["bazel*/**"],
    ),
    visibility = ["//visibility:public"],
)

Then, here’s how I’m (apparently successfully) compiling it:

# //:external/libwebp/BUILD.bazel
load("@rules_foreign_cc//foreign_cc:defs.bzl", "configure_make")

configure_make(
    name = "libwebp",
    autogen = True,
    configure_in_place = True,
    configure_options = [],
    env = select({
        "@platforms//os:macos": {
            "AR": "/usr/bin/ar",
        },
        "//conditions:default": {},
    }),
    lib_source = "@libwebp//:srcs",
    visibility = ["//visibility:public"],
)

Finally, the go-webp Go repository:

go_repository(
    name = "com_github_kolesa_team_go_webp",
    importpath = "github.com/kolesa-team/go-webp",
    patches = ["//:bazel/com_github_kolesa_team_go_webp/build.patch"],  # keep
    sum = "h1:wQvU4PLG/X7RS0vAeyhiivhLRoxfLVRlDq4I3frdxIQ=",
    version = "v1.0.4",
)

Where the patch contains:

--- encoder/BUILD.bazel
+++ encoder/BUILD.bazel
@@ -7,7 +7,7 @@
         "options.go",
     ],
     cgo = True,
-    clinkopts = ["-lwebp"],
+    cdeps = ["@asset-tracker//external/libwebp"],
     importpath = "github.com/kolesa-team/go-webp/encoder",
     visibility = ["//visibility:public"],
 )

Trying to build a service that depends on go-webp results in linker not finding some symbols from the webp library:

ld: warning: ignoring duplicate libraries: '-lc++', '-lm'
Undefined symbols for architecture arm64:
  "_SharpYuvConvert", referenced from:
      _PreprocessARGB in libwebp.a[87](libwebpencode_la-picture_csp_enc.o)
  "_SharpYuvGetConversionMatrix", referenced from:
      _PreprocessARGB in libwebp.a[87](libwebpencode_la-picture_csp_enc.o)
  "_SharpYuvInit", referenced from:
      _ImportYUVAFromRGBA in libwebp.a[87](libwebpencode_la-picture_csp_enc.o)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

link: error running subcommand external/go_sdk/pkg/tool/darwin_arm64/link: exit status 2

Some info about my system:

Darwin 23.5.0 Darwin Kernel Version 23.5.0: Wed May  1 20:14:38 PDT 2024; root:xnu-10063.121.3~5/RELEASE_ARM64_T6020 arm64
bazel 7.2.1

Had a really hard time figuring out the configure_make build on macOS for the webp library and now I am not sure where I have gone wrong about it.

Now, the question(s): How would I go about debugging this? Is there any known issue that I might have missed in my research?

^{Disclaimer: I initially thought this would belong on someone’s GitHub Issues page, but honestly I’m not sure on which repository this would even belong.}