Bazel中的SWIG规则可以指定要生成哪些类型的输出文件，例如C++ header文件或Python模块。如果您只需要其中一些文件，则需要指定可选输出。您可以通过以下方式实现此目的：

1. 在SWIG规则中设置输出文件的标记（例如GenCpp），并将其与输出文件类型关联。这可以通过使用SWIG的“-o”标志和“%typemap（directors）”来完成：

swig_library( name = "my_library", srcs = ["my_library.i"], deps = [...], swagger = "//path/to:swagger_binary", args = ["-c++", "-python", "-outdir", "myoutdir"], visibility = ["//visibility:public"], tags = ["requires_pip"] )

genrule( name = "gen_cpp", srcs = [":my_library"], cmd = "$(location my_library) -c++ -outdir $(output) $<", outs = [ "my_library.cpp", "my_library.h", "my_library_py.cpp", ], )

2.通过bazel-genfiles目录将输出文件传递到依赖项：

cc_library( name = "my_cc_library", hdrs = [ "my_library.h", ], srcs = [ "my_library.cpp", ], deps = [...], visibility = ["//visibility:public"], )

py_library( name = "my_py_library", srcs = [ "@python//myoutdir:my_library_py", ], deps = [...], visibility = ["//visibility:public"], tags = ["requires_pip"] )

3.在BUILD文件中使用genrule依赖项：

swig_library( name = "my_library", srcs = ["my_library.i"], deps = [...], swagger = "//path/to:swagger_binary", args = ["-c++", "-python", "-outdir", "myoutdir"], visibility = ["//visibility:public"], tags = ["requires_pip"], genrule_attrs = { "outs": [ "