add support for passing through sizeof & alignofs

1 files changed, 18 insertions, 8 deletions

diff --git a/README.txt b/README.txt
index 2ffd02d..cdf7306 100644
--- a/README.txt
+++ b/README.txt
@@ -42,14 +42,24 @@ Selling points:
 
 Known to be unsupported:
 
-- dietC is ... optimistic about identifier conflicts with its generated
-  labels. It likely will not work if you run it on its own output. This is very
-  fixable, will do soon.
-- chibicc does not have good support for long double; specifically, long
-  doubles cannot be used in constant expressions. This is fixable, but requires
-  non-trivial modifications to the chibicc side of the code.
-- chibicc does not parse const, volatile, etc. type qualifiers. it would not be
-  too hard to support this if desired.
+  - dietC is ... optimistic about identifier conflicts with its generated
+    labels. It likely will not work if you run it on its own output. This is
+    very fixable, will do soon.
+  - chibicc does not have good support for long double; specifically, long
+    doubles cannot be used in constant expressions. This is fixable, but
+    requires non-trivial modifications to the chibicc side of the code.
+  - chibicc does not parse const, volatile, etc. type qualifiers. it would not
+    be too hard to support this if desired.
+
+Options:
+
+  - Passing "--line-numbers" enables (very WIP) support for outputting #line
+    directives. The dietcc wrapper will attempt to automatically strip those
+    before calling passes & then re-insert them, so that it all happens
+    "automagically." Of course, it doesn't really. You'll probably find that it
+    has roughly the right file, but totally wrong line.
+  - Passing "--type-builtins" will output "sizeof(Type_%d)" and
+    "alignof(Type_%d)" instead of pre-computing these operations.
 
 Why not cilly?