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如何在 Bazel 项目中为 d8 设置命令行标志？

[英]How do you set command line flags for d8 in a Bazel project?

原文 2019-12-27 02:44:55 4 1 android/ bazel/ android-d8/ android-r8

For example if I wanted to set --min-api to 26: https://r8.googlesource.com/r8/+/b9cb6ae34047f19320885d9e2c594f81364fa896/src/main/java/com/android/tools/r8/D8CommandParser.java#120例如，如果我想将--min-api设置为 26： https : --min-api

I've tried various .bazelrc combinations with Bazel's -s flag on to see the subcommands called with their flags and I don't see anything being added as I'd would like:我已经尝试了各种带有 Bazel 的-s标志的.bazelrc组合，以查看使用其标志调用的子命令，但我没有看到任何添加的内容，因为我希望：

build:d8 --define=min-api=26
build:d8 --min-api=26
build:d8 --min-api 26

Ideally though this would be set somewhere in a BUILD file so it's configurable per target.理想情况下，这将设置在 BUILD 文件中的某个位置，因此它可以针对每个目标进行配置。

1 个解决方案

Unfortunately this doesn't seem possible.不幸的是，这似乎不可能。 Bazel uses CompatDexBuilder while we remove the remaining dex support code: Bazel 使用CompatDexBuilder而我们删除了剩余的 dex 支持代码：

https://github.com/bazelbuild/bazel/blob/d1ff8c2d15454444094f94765d4b57ce0232bb51/tools/android/BUILD.tools#L42 https://github.com/bazelbuild/bazel/blob/d1ff8c2d15454444094f94765d4b57ce0232bb51/tools/android/BUILD.tools#L42

and CompatDexBuilder appears to hardcode the min api level:并且CompatDexBuilder似乎对最小 api 级别进行了硬编码：

https://r8.googlesource.com/r8/+/41d2ea5adff39b579b297219310199fd566e778b/src/main/java/com/android/tools/r8/compatdexbuilder/CompatDexBuilder.java#169 https://r8.googlesource.com/r8/+/41d2ea5adff39b579b297219310199fd566e778b/src/main/java/com/android/tools/r8/compatdexbuilder/CompatDexBuilder.java#169

H_MR2 corresponds to 13: H_MR2对应13：

https://r8.googlesource.com/r8/+/60e493f814cb2a37e3b02a30c09023c56b6d1bf9/src/main/java/com/android/tools/r8/utils/AndroidApiLevel.java#32 https://r8.googlesource.com/r8/+/60e493f814cb2a37e3b02a30c09023c56b6d1bf9/src/main/java/com/android/tools/r8/utils/AndroidApiLevel.java#32

I filed a github issue here: https://github.com/bazelbuild/bazel/issues/10556我在这里提交了一个 github 问题： https : //github.com/bazelbuild/bazel/issues/10556