Bazel can't find the mupdf lib

[LuizEduardoCardozo]

Bazel can't find the mupdf lib

[gen2brain]

You are building with -tags extlib,pkgconfig,extlib,pkgconfig, so it expects you to install mupdf libraries and all dependencies and will not use bundled static libraries.

[gen2brain]

But then again, it wants mupdf_linux_amd64, which is a static library bundled, it would need only -lmudpf in that case. No idea, can you build with go build? Does bazel uses go build or some of their implementation?

Btw. also check #31

[LuizEduardoCardozo]

The tags was a test that I did before. I updated the error file to the version without it, and the error is the same...

The project builds normally with go build, the problem only occurs with bazel build.

And I think yes, the bazel just wraps the go compiler. I'm looking in the go_rules repository to check for some "default tags" that could be the cause.

The "-lmupdf" is being used, but it's in go-fitz BUILD.bazel. This error is caused by it: I tell to bazel use the mupdf lib, but it's doesn't find it.

[gen2brain]

No idea, as you can see from the previous bazel issue it seemed like it does not respect build tags at all, it enabled them all by default and that is not how it should work.

Anyway, nothing that I can fix here, this library is specific in that it includes static libraries, so vendoring will not work then (it will not copy libraries), etc. unless you use your external libraries and extlib tag.

[wisechengyi]

To follow up, we found a way to build it in bazel, here is a manual diff on top of what can be generated automatically by gazelle, which essentially does two things

1. include the header files directly into go_library
2. put .a files into a cc_library target and add to the go_library as cdeps, inspired by bazelbuild/bazel-gazelle#1120 (comment)

diff --git a/BUILD.bazel b/BUILD.bazel
index e8ba74f..2dc361d 100755
--- a/BUILD.bazel
+++ b/BUILD.bazel
 
+cc_library(
+    name = "clib",
+    srcs = select({
+        "@io_bazel_rules_go//go/platform:darwin_amd64": [
+            "libs/libmupdf_darwin_amd64.a",
+            "libs/libmupdfthird_darwin_amd64.a",
+        ],
+        "@io_bazel_rules_go//go/platform:darwin_arm64": [
+            "libs/libmupdf_darwin_arm64.a",
+            "libs/libmupdfthird_darwin_arm64.a",
+        ],
+        "@io_bazel_rules_go//go/platform:linux_amd64": [
+            "libs/libmupdf_linux_amd64.a",
+            "libs/libmupdfthird_linux_amd64.a",
+        ],
+        "@io_bazel_rules_go//go/platform:linux_arm64": [
+            "libs/libmupdf_linux_arm64.a",
+            "libs/libmupdfthird_linux_arm64.a",
+        ],
+        "//conditions:default": ["UNSUPPORTED_PLATFORM"],
+    }),
+)
+
 go_library(
     name = "fitz",
     srcs = [
         "fitz.go",
         "fitz_cgo.go",
         "fitz_content_types.go",
-    ],
+    ] + glob(["include/**/*.h"]),
+    cdeps = [":clib"],
     cgo = True,