rules: Refactoring and minor improvements

Compared to the previous commit, the action graphs for just
and its unit tests are unchanged.
- Git hash of action graph for ["",""]:
    c6e75f17abd7ffaab6ff9bb725ad67ec0bf6c973
- Git hash of action graph for ["test/buildtool","TESTS"]:
    8063dfb3dd7daa9ae01d95c177e14946f785c57e

Refactor:
- "local cflags" to "private-cflags"
- "local defines" to "private-defines"
- "link externals" to "private-ldflags"
- "deps" to "private-deps" for (test) binaries
- "proto" to "private-proto" for binaries

Improvements:
- consistent variable declaration order:
    OS, ARCH, HOST_ARCH, TARGET_ARCH,
    CC, CXX, CFLAGS, CXXFLAGS, ADD_CFLAGS, ADD_CXXFLAGS,
    AR, ENV, PATH
- use fields close to their definition (in RULES)
- use common expression for binaries and test binaries
- split expression "flags" and "compiler"
  ... to separate ones for CC and CXX.
- rename "transition" to "deps-transition"
  ... to avoid conflicts with other transitions.
- support "defaults-transition" for CC expressions

Implement:
- "cflags" for libraries
- "private-cflags" for (test) binaries
- "private-defines" for test binaries
- "private-ldflags" for test binaries
- (public) "defines" for libraries

1 files changed, 27 insertions, 30 deletions

diff --git a/CC/proto/RULES b/CC/proto/RULES
index d53ab35..d1cfc4e 100644
--- a/CC/proto/RULES
+++ b/CC/proto/RULES
@@ -8,25 +8,12 @@
   , "string_fields": ["name", "stage"]
   , "target_fields": ["srcs", "deps"]
   , "config_vars":
-    [ "OS"
-    , "ARCH"
-    , "HOST_ARCH"
-    , "CXX"
-    , "CC"
-    , "CXXFLAGS"
-    , "CFLAGS"
-    , "ADD_CXXFLAGS"
-    , "ADD_CFLAGS"
-    , "ENV"
-    , "AR"
-    ]
+    ["OS", "ARCH", "HOST_ARCH", "CXX", "CFLAGS", "ADD_CFLAGS", "AR", "ENV"]
   , "implicit":
     { "protoc": [["@", "protoc", "", "protoc"]]
     , "defaults": [["./", "..", "defaults"]]
     , "proto-deps": [["@", "protoc", "", "C++ runtime"]]
     , "well_known_protos": [["@", "protoc", "", "well_known_protos"]]
-    , "pure C": []
-    , "private-deps": []
     }
   , "imports":
     { "protoc-compile": "protoc-compile"
@@ -37,7 +24,19 @@
   , "expression":
     { "type": "let*"
     , "bindings":
-      [["transition", {"type": "CALL_EXPRESSION", "name": "host transition"}]]
+      [ ["name", {"type": "join", "$1": {"type": "FIELD", "name": "name"}}]
+      , [ "stage"
+        , { "type": "join"
+          , "separator": "/"
+          , "$1": {"type": "FIELD", "name": "stage"}
+          }
+        ]
+      , [ "deps-transition"
+        , {"type": "CALL_EXPRESSION", "name": "host transition"}
+        ]
+      , ["public-fieldnames", ["deps", "proto-deps"]]
+      , ["private-fieldnames", ["deps", "proto-deps"]]
+      ]
     , "body": {"type": "CALL_EXPRESSION", "name": "protoc-compile"}
     }
   }
@@ -51,18 +50,7 @@
   , "string_fields": ["name", "stage"]
   , "target_fields": ["srcs", "deps"]
   , "config_vars":
-    [ "OS"
-    , "ARCH"
-    , "HOST_ARCH"
-    , "CXX"
-    , "CC"
-    , "CXXFLAGS"
-    , "CFLAGS"
-    , "ADD_CXXFLAGS"
-    , "ADD_CFLAGS"
-    , "ENV"
-    , "AR"
-    ]
+    ["OS", "ARCH", "HOST_ARCH", "CXX", "CXXFLAGS", "ADD_CXXFLAGS", "AR", "ENV"]
   , "implicit":
     { "protoc": [["@", "protoc", "", "protoc"]]
     , "grpc_cpp_plugin": [["@", "grpc", "src/compiler", "grpc_cpp_plugin"]]
@@ -72,8 +60,6 @@
       , ["@", "protoc", "", "C++ runtime"]
       ]
     , "well_known_protos": [["@", "protoc", "", "well_known_protos"]]
-    , "pure C": []
-    , "private-deps": []
     }
   , "imports":
     { "protoc-compile": "protoc-compile"
@@ -88,7 +74,18 @@
     { "type": "let*"
     , "bindings":
       [ ["service support", true]
-      , ["transition", {"type": "CALL_EXPRESSION", "name": "host transition"}]
+      , ["name", {"type": "join", "$1": {"type": "FIELD", "name": "name"}}]
+      , [ "stage"
+        , { "type": "join"
+          , "separator": "/"
+          , "$1": {"type": "FIELD", "name": "stage"}
+          }
+        ]
+      , [ "deps-transition"
+        , {"type": "CALL_EXPRESSION", "name": "host transition"}
+        ]
+      , ["public-fieldnames", ["deps", "proto-deps"]]
+      , ["private-fieldnames", ["deps", "proto-deps"]]
       ]
     , "body": {"type": "CALL_EXPRESSION", "name": "protoc-compile"}
     }