From 7fab365ffe9761c68d7c4c4ddefec860c5703c35 Mon Sep 17 00:00:00 2001
From: Melody Horn <melody@boringcactus.com>
Date: Thu, 25 Mar 2021 21:17:53 -0600
Subject: lift builtin macros from GNU make, not POSIX make

---
 yapymake/makefile/__init__.py | 37 ++++++++++++++++++++++++++++++++-----
 1 file changed, 32 insertions(+), 5 deletions(-)

diff --git a/yapymake/makefile/__init__.py b/yapymake/makefile/__init__.py
index 3407b3c..1f4687c 100644
--- a/yapymake/makefile/__init__.py
+++ b/yapymake/makefile/__init__.py
@@ -33,7 +33,11 @@ class Makefile:
         if args.builtin_rules:
             self._inference_rules += BUILTIN_INFERENCE_RULES
             for k, v in BUILTIN_MACROS.items():
-                self._macros[k] = (MacroSource.Builtin, TokenString.text(v))
+                if isinstance(v, TokenString):
+                    v_tokens = v
+                else:
+                    v_tokens = TokenString.text(v)
+                self._macros[k] = (MacroSource.Builtin, v_tokens)
             for target in BUILTIN_TARGETS:
                 self._targets[target.name] = target
 
@@ -480,19 +484,42 @@ BUILTIN_INFERENCE_RULES = [
         CommandLine(tokenize('rm -f $*.o')),
     ]),
 ]
-BUILTIN_MACROS = {
+BUILTIN_MACROS: Dict[str, Union[str, TokenString]] = {
     'MAKE': 'make',
     'AR': 'ar',
-    'ARFLAGS': '-rv',
+    #'ARFLAGS': '-rv',
     'YACC': 'yacc',
     'YFLAGS': '',
     'LEX': 'lex',
     'LFLAGS': '',
     'LDFLAGS': '',
-    'CC': 'c99',
+    #'CC': 'c99',
     'CFLAGS': '-O 1',
-    'FC': 'fort77',
+    #'FC': 'fort77',
     'FFLAGS': '-O 1',
+
+    # TODO bitch about the non-POSIXness of these GNUisms
+    # from https://www.gnu.org/software/make/manual/html_node/Implicit-Variables.html#Implicit-Variables
+    'AS': 'as',
+    'CC': 'cc',
+    'CXX': 'g++',
+    'CPP': tokenize('$(CC) -E'),
+    'FC': 'f77',
+    'M2C': 'm2c',
+    'PC': 'pc',
+    'CO': 'co',
+    'GET': 'get',
+    'LINT': 'lint',
+    'MAKEINFO': 'makeinfo',
+    'TEX': 'tex',
+    'TEXI2DVI': 'texi2dvi',
+    'WEAVE': 'weave',
+    'CWEAVE': 'cweave',
+    'TANGLE': 'tangle',
+    'CTANGLE': 'ctangle',
+    'RM': 'rm -f',
+
+    'ARFLAGS': 'rv',
 }
 BUILTIN_TARGETS = [
     Target('.SUFFIXES', ['.o', '.c', '.y', '.l', '.a', '.sh', '.f'], []),
-- 
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