如果未在工作区的根目录中声明目标，则无法找到 jni.h

Question

我有一个比较简单的BUILD文件：

cc_library(
  name = "target",
  srcs = [
    "@local_jdk//:jni_header",
    "@local_jdk//:jni_md_header-linux",
    "hello.cc",
  ],
  includes = [
    "external/local_jdk/include",
    "external/local_jdk/include/linux",
  ],
  linkstatic = 1
)

使用更简单的源文件：

#include <jni.h>

如果两个文件都位于工作区根目录下，则一切正常：

$ bazel build //:target
INFO: Analysed target //:target (1 packages loaded).
INFO: Found 1 target...
Target //:target up-to-date:
  bazel-bin/libtarget.a
INFO: Elapsed time: 0.348s, Critical Path: 0.00s
INFO: Build completed successfully, 1 total action

但是，如果我将它们嵌套在一个目录中，构建就会失败：

$ bazel build //nested:target
WARNING: /path/to/workspace/nested/BUILD:3:10: in srcs attribute of cc_library rule //nested:target: please do not import '@local_jdk//:include/jni.h' directly. You should either move the file to this package or depend on an appropriate rule there
WARNING: /path/to/workspace/nested/BUILD:3:10: in srcs attribute of cc_library rule //nested:target: please do not import '@local_jdk//:include/linux/jni_md.h' directly. You should either move the file to this package or depend on an appropriate rule there
INFO: Analysed target //nested:target (0 packages loaded).
INFO: Found 1 target...
ERROR: /path/to/workspace/nested/BUILD:1:1: C++ compilation of rule '//nested:target' failed (Exit 1)
nested/hello.cc:1:10: fatal error: jni.h: No such file or directory
 #include <jni.h>
      ^~~~~~~
compilation terminated.
Target //nested:target failed to build
Use --verbose_failures to see the command lines of failed build steps.
INFO: Elapsed time: 0.424s, Critical Path: 0.09s
FAILED: Build did NOT complete successfully

我是不是看错了？

$ bazel version
Build label: 0.12.0
Build target: bazel-out/k8-opt/bin/src/main/java/com/google/devtools/build/lib/bazel/BazelServer_deploy.jar
Build time: Tue Aug 4 01:22:27 +50246 (1523462001747)
Build timestamp: 1523462001747
Build timestamp as int: 1523462001747

Answer 1

不是修复，而是解决方法...

在顶级 BUILD 文件中：

cc_library(
  name = "jni_headers",
  srcs = [
    "@local_jdk//:jni_header",
    "@local_jdk//:jni_md_header-linux",
  ],
  includes = [
    "external/local_jdk/include",
    "external/local_jdk/include/linux",
  ],
  visibility = [
    "//visibility:public",
  ],
)

在嵌套目录中：

cc_library(
  name = "target",
  srcs = [
    "hello.cc",
  ],
  deps = [
    "//:jni_headers",
  ]
  linkstatic = 1
)

如果未在工作区的根目录中声明目标，则无法找到 jni.h

Can't find jni.h if target not declared at the root of workspace

java

java-native-interface

bazel