Importing the header of an objc_library from another objc_library

Hello:

Description of the problem:

I am trying to consume an objc_library from a objc_library as follows:

load("@rules_cc//cc:defs.bzl", "objc_library")
load("@build_bazel_rules_apple//apple:ios.bzl", "ios_unit_test")

objc_library(
    name = "ObjcModule",
    srcs = ["Sources/ObjcModule.m"],
    hdrs = ["Sources/ObjcModule.h"],
    module_name = "ObjcModule",
)

objc_library(
    name = "ObjcModuleTestsLib",
    srcs = ["ObjcTests/SomeCodeTests.m"],
    deps = [":ObjcModule"],
)

ios_unit_test(
    name = "ObjcModuleTests",
    minimum_os_version = "8.0",
    deps = [":ObjcModuleTestsLib"],
)

The content of ObjcTests/SomeCodeTests.m is:

#import <XCTest/XCTest.h>
#import "ObjcModule/ObjcModule.h"

@interface ObjcModuleTests: XCTestCase
@end

@implementation ObjcModuleTests
- (void)test {
  XCTAssertEqual(text, @"Hello, World!"); // The text constant is declared inside ObjcModule.h
}
@end

When running bazel build //Libraries/ObjcModule:ObjcModuleTestsLib, in line #import "ObjcModule/ObjcModule.h" I am getting the error Libraries/ObjcModule/ObjcTests/SomeCodeTests.m:2:9: fatal error: 'ObjcModule/ObjcModule.h' file not found. The only way I can make it work is by using the full path from the WORKSPACE: #import "Libraries/ObjcModule/Sources/ObjcModule.h".

I expected #import "ObjcModule/ObjcModule.h" to work when doing module_name = "ObjcModule". Any idea why it doesn’t? Any workaround? Is this expected behaviour?

I am using bazel 0.29.1.

Thanks!

[sergiocampama]

I don’t think that’s how objc modules are supposed to work, though I’m no expert in that subject. I believe with modules you are supposed to import objc modules using the @import ObjcModule statement, but I’m unclear on what the status is of that feature.

The expected way to import it is using the full path relative to the workspace, as you’ve already found. If what you really want is to have a shorter import path, you could in theory add an includes = ["."], attribute to the ObjcModule target, and then the directory where that target lives will be added as an include path, so you could just do #import "ObjcModule.h".

Keep in mind that sprinkling include attributes might slow down your compilation a bit as the compiler will have to stat more locations to find the imported headers.

[bigbangvn]

Cool, thanks @vikage I used the trick from @acecilia https://github.com/bazelbuild/bazel/issues/9461#issuecomment-537270226 It works also but no need to depends on rules_ios