Clean up source variables with empty list (#279)

Summary: Pull Request resolved: #279

Reviewed By: juliencbmeta

Differential Revision: D73198816

fbshipit-source-id: 2b89e7aa25784d381d6cc3bccedf919ed2a37696

Author: jeongseok-meta

CMakeLists.txt

@@ -395,8 +395,6 @@ mt_library(
   NAME io_urdf
   HEADERS_VARS
     io_urdf_public_headers
-  PRIVATE_HEADERS_VARS
-    io_urdf_private_headers
   SOURCES_VARS io_urdf_sources
   PUBLIC_LINK_LIBRARIES
     character
@@ -539,7 +537,6 @@ if(MOMENTUM_BUILD_TESTING)
   mt_library(
     NAME solver_test_helper
     HEADERS_VARS solver_test_helper_public_headers
-    SOURCES_VARS solver_test_helper_sources
     PUBLIC_LINK_LIBRARIES
       solver
     NO_INSTALL

cmake/build_variables.bzl

@@ -116,9 +116,6 @@ solver_sources = [
     "solver/gradient_descent_solver.cpp",
 ]
 
-solver_test_sources = [
-]
-
 skeleton_public_headers = [
     "character/fwd.h",
     "character/joint_state.h",
@@ -413,9 +410,6 @@ io_urdf_public_headers = [
     "io/urdf/urdf_io.h",
 ]
 
-io_urdf_private_headers = [
-]
-
 io_urdf_sources = [
     "io/urdf/urdf_io.cpp",
 ]
@@ -492,9 +486,6 @@ solver_test_helper_public_headers = [
     "test/solver/solver_test_helpers.h",
 ]
 
-solver_test_helper_sources = [
-]
-
 error_function_helper_public_headers = [
     "test/character_solver/error_function_helpers.h",
 ]