java_library: output JNI headers generated by javac
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(This is a mirror of thought-machine/please#2525.) |
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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chrisnovakovic
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Aug 9, 2022
| @@ -87,6 +90,33 @@ def java_library(name:str, srcs:list=None, src_dir:str=None, resources:list=[], | |||
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| src_dir_label = [] if srcs else ['src_dir:'+src_dir] | |||
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| def _jni_header_outputs(name, output): | |||
| for hdr_path in output: | |||
| if hdr_path != "": | |||
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This is just to guard against the command outputting \n when no headers are generated.
chrisnovakovic
commented
Aug 9, 2022
| }, | ||
| cmd = " && ".join([ | ||
| "mkdir -p _jni", | ||
| f"{javac_cmd} -h _jni >/dev/null 2>&1", |
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Silencing the output of javac here as a precaution because it's possible to instruct javac to output to stdout instead of stderr using a command line option (i.e. via javac_flags) - it's an edge case, but one that'll break this target if it's used. The main target will still show compilation errors for the class files.
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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.