build - Bazel : handle intermediate files in ctx.action -


i trying implement custom c_library() rule in bazel takes bunch of .c files input , produces .a static library. in implementation, .c files generate .o objects , archives .a library. seems .o files not getting generated. here custom c_library() rule (rules.bzl file):

def _change_ext_to_x( file_list, x = 'o' ):     # inputs file list (i.e. string list)     # , changes extensions '.{x}'     return [ "".join( onefile.split('.')[:-1] ) + '.' + x \                     onefile in file_list ]  def _str_to_file( ctx, file_list ):     # constructor of file() object     # pass context     return [ ctx.new_file( onefile ) onefile in file_list ]  def _c_library_impl( ctx ):     # implementation of 'c_library' rule      # source files list ( strings )     in_file_list = []     onefile in ctx.files.srcs:         in_file_list.append( onefile.basename )      out_file_list = _str_to_file( ctx, # current context                            _change_ext_to_x(in_file_list, x = 'o') )      ctx.action(         inputs = ctx.files.srcs,         outputs = out_file_list,         progress_message = "compiling <.c> <.o>",         use_default_shell_env = true,         command = "gcc -c -o3 %s" % " ".join( in_file_list )     )      ctx.action(         inputs = out_file_list,         outputs = [ ctx.outputs._libfile ],         progress_message = "archiving <.o>s <.a>",         use_default_shell_env = true,         arguments = [ctx.outputs._libfile.basename],         command = "ar cr $1 %s" % " ".join( [onefile.basename                                          onefile in out_file_list] )     )      pass  c_library = rule(     # define rule 'c' library     implementation = _c_library_impl,     attrs = {         "srcs" : attr.label_list( allow_files = true,                                   mandatory = true,                                   allow_empty = false ),         "out" : attr.output( mandatory = false )     },     outputs = {         "_libfile" : "lib%{name}.a"     } )

and here build file:

load("//:rules.bzl", "c_library")  c_library(     name = "foo",     srcs = glob(include = ["*.c"], exclude = ["main.c"])     # there 2 files 'cmd.c' , 'utils.c' in package )

when did bazel build //:foo, got following error:

info: found 1 target... error: /home/spyder/desktop/project/build:3:1: output 'cmd.o' not created. error: /home/spyder/desktop/project/build:3:1: output 'utils.o' not created. error: /home/spyder/desktop/project/build:3:1: not outputs created or valid. target //:foo failed build use --verbose_failures see command lines of failed build steps. info: elapsed time: 2.249s, critical path: 1.94s

how persist intermediate files between 2 successive ctx.actions ?

you should create 1 action per .c file instead of 1 action of them, increase parallelism, , specified output:

def _c_library_impl( ctx ):     # implementation of 'c_library' rule     out_file_list = []     f in ctx.files.srcs:       o = ctx.new_file(f.basename + ".o")       out_file_list.append(o)       ctx.action(         inputs = [f],         outputs = [o],         progress_message = "compiling <.c> <.o>",         use_default_shell_env = true,         command = "gcc -c -o3 %s %s" % (f.path, o.path)       )      ctx.action(         inputs = out_file_list,         outputs = [ ctx.outputs._libfile ],         progress_message = "archiving <.o>s <.a>",         use_default_shell_env = true,         command = "ar cr %s %s" % (ctx.outputs._libfile.path,                                     "\n".join([onefile.basename                                          onefile in out_file_list] )     )

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