C++ Bazel build :grpc++ fails because -Werror,-Wunused-parameter

[Albert Lockett]

Hi - I'm trying to get started on a new GRCP project written in C++. I'm using Bazel as a build tool. I'm using a bare-bones configuration and it's failing to build.

this is using release 1.41.1 (635693ce624f3b3a89e5a764f0664958ef08b2b9)

WORKSPACE

workspace(name = "myproj")

load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")

http_archive(

name = "com_github_grpc_grpc",

urls = [

"https://github.com/grpc/grpc/archive/635693ce624f3b3a89e5a764f0664958ef08b2b9.tar.gz",

],

strip_prefix = "grpc-635693ce624f3b3a89e5a764f0664958ef08b2b9",

)

load("@com_github_grpc_grpc//bazel:grpc_deps.bzl", "grpc_deps")

grpc_deps()

load("@com_github_grpc_grpc//bazel:grpc_extra_deps.bzl", "grpc_extra_deps")

grpc_extra_deps() BUILD

cc_binary(

name = "main",

srcs = [

"main.cpp",

],

defines = ["BAZEL_BUILD"],

deps = [

"@com_github_grpc_grpc//:grpc++",

],

)

Running bazel build :all produces the following error: DEBUG: Rule 'com_github_grpc_grpc' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "bd2ec83a5ed255950daa00e5c8a557a97b8ae20e530757c6c07ea4d78c846caa" DEBUG: Repository com_github_grpc_grpc instantiated at: /Users/albert.lockett2/Development/myproj/WORKSPACE:5:13: in <toplevel> Repository rule http_archive defined at: /private/var/tmp/_bazel_albert.lockett2/fdc77f09a5335393a1ec30d3d123ee8d/external/bazel_tools/tools/build_defs/repo/http.bzl:336:31: in <toplevel> INFO: Analyzed target //:main (1 packages loaded, 2 targets configured). INFO: Found 1 target... ERROR: /private/var/tmp/_bazel_albert.lockett2/fdc77f09a5335393a1ec30d3d123ee8d/external/upb/upbc/BUILD:63:10: Compiling upbc/protoc-gen-upbdefs.cc [for host] failed: (Exit 1): cc_wrapper.sh failed: error executing command external/local_config_cc/cc_wrapper.sh -U_FORTIFY_SOURCE -fstack-protector -Wall -Wthread-safety -Wself-assign -fcolor-diagnostics -fno-omit-frame-pointer -g0 -O2 '-D_FORTIFY_SOURCE=1' -DNDEBUG ... (remaining 49 argument(s) skipped) Use --sandbox_debug to see verbose messages from the sandbox In file included from external/upb/upbc/protoc-gen-upbdefs.cc:31: In file included from /usr/local/include/google/protobuf/descriptor.pb.h:24: /usr/local/include/google/protobuf/arena.h:445:18: error: unused parameter 'p' [-Werror,-Wunused-parameter] const T* p, std::false_type /*has_get_arena*/) { ^ 1 error generated. Target //:main failed to build Use --verbose_failures to see the command lines of failed build steps. INFO: Elapsed time: 3.117s, Critical Path: 2.92s INFO: 55 processes: 47 internal, 8 darwin-sandbox. FAILED: Build did NOT complete successfully Does anyone have a working minimal grpc c++ setup using bazel that they'd be willing to share?

[Nicolas Noble]

From your workspace, you're in control of which build switch you're passing. Disable the offending flags. Feel free to inspire yourself from the current setup grpc uses for building using bazel:

https://github.com/grpc/grpc/blob/master/.bazelrc

https://github.com/grpc/grpc/blob/master/.bazelignore

https://github.com/grpc/grpc/blob/master/tools/bazel

https://github.com/grpc/grpc/blob/master/tools/bazel.rc

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