bazel - Simple cc_library rule as a Skylark rule -


i have simple cc_library() rule convert skylark rule.

the cc_library() rule is:

cc_library(   name = 'cc_library_a',   srcs = [ 'a.c' ], )

the challange i'm facing concerining compilation flags passed through different methods - one, command line. assume run following command line:

# bazel build :a --copt -h

this add -h flag compilation command. question here how can -h flag propagated skylark rule?

i have tried following did not work:

def _my_rule(ctx):     _arguments = [ '-c' ]     _arguments.append(ctx.file.src.path)     _arguments += ctx.fragments.cpp.c_options     _arguments += [ '-o', ctx.outputs.out.path ]      ctx.actions.run(         outputs = [ ctx.outputs.out ],         inputs = [ ctx.file.src ],         arguments = _arguments,         executable = ctx.fragments.cpp.compiler_executable,     )  my_rule = rule(     implementation = _my_rule,     attrs = {         'src': attr.label(allow_single_file = true),     },     outputs = {         'out': '%{name}.o',     },     fragments = [ 'cpp' ], )

the build file content following:

load(':rules.bzl', 'my_rule')  my_rule(     name = 'skylark_a',     src = 'a.c', )   cc_library(     name = 'cc_library_a',     srcs = [ 'a.c' ], )

the output of building skylark rule shows --copt ignored:

# bazel build skylark_a --copt -h --subcommands info: found 1 target... >>>>> # //:skylark_a [action 'skylarkaction skylark_a.o'] (cd /bazel/jbasila/_bazel_jbasila/4d692aace2e7e1a45eec9fac3922ea8d/execroot/__main__ && \   exec env - \   /usr/bin/gcc -c a.c -o bazel-out/local-fastbuild/bin/skylark_a.o) info: skylarkaction skylark_a.o: a.c: in function 'a': a.c:3:5: warning: implicit declaration of function 'puts' [-wimplicit-function-declaration]      puts("a");      ^~~~ target //:skylark_a up-to-date:   bazel-bin/skylark_a.o info: elapsed time: 0.578s, critical path: 0.05s

what missing?

because --copt -h parameter generic c , c++ need flags using ctx.fragments.cpp.compiler_options([]) instead. ctx.fragments.cpp.c_options code using c specific options.

likewise, there ctx.fragments.cpp.cxx_options([]) function provides c++ specific options.


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