java_library: output JNI headers generated by javac
#2525
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rules/java_rules.build_defs
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| javac_flags = CONFIG.JAVAC_TEST_FLAGS if test_only else CONFIG.JAVAC_FLAGS | ||
| javac_flags = '-g -encoding utf8 ' + javac_flags | ||
| javac_flags = '-h _jni -g -encoding utf8 ' + javac_flags |
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There doesn't seem to be any significant overhead in invoking the compiler with -h even when the JNI headers aren't needed (at least not compared with the time it takes to generate the class files).
rules/java_rules.build_defs
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| javac_cmd, | ||
| "find _jni -type f -name '*.h' | sort", |
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This should be safe because javac only ever outputs on stderr by default, so it shouldn't mess up the post-build output collection.
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Thanks! Would you mind please opening this against https://github.com/please-build/java-rules instead? Those plugin repos are where future development of language-specific rules will happen. I have a couple of comments too but let's pick the conversation up there :) |
chrisnovakovic
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Will do - I noticed a couple of CI failures in here that I didn't see over there, so I'll fix those, then force-push equivalent changes to please-build/java-rules#13. |
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The Java compiler outputs header files for Java sources that use the Java Native Interface (JNI), but there's currently no way for them to be consumed by the native-code components that depend on them, preventing them from being built. Provide the JNI headers as outputs of `java_library` when `cc_hdrs` is required. This allows native-code JNI components written in C/C++ to be built by including the `java_library` target as a dependency.
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The Java compiler outputs header files for Java sources that use the Java Native Interface (JNI), but there's currently no way for them to be consumed by the native-code components that depend on them, preventing them from being built.
Provide the JNI headers as outputs of
java_librarywhencc_hdrsis required. This allows native-code JNI components written in C/C++ to be built by including thejava_librarytarget as a dependency.