buildman: Include symbols in the read-only data section

When symbols switch between the inited data section and the read-only
data section their visbility changes, at present, with the -B option.

This is confusing, since adding 'const' to a variable declaration can
make it look like a significant improvement in bloat. But in fact
nothing has changed.

Add 'r' to the list of symbols types that are recorded, to correct this
problem. Add a constant to make it easier to find this code next time.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reported-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

tools/buildman/builder.py

@@ -35,6 +35,10 @@ from u_boot_pylib.terminal import tprint
 # which indicates that BREAK_ME has an empty default
 RE_NO_DEFAULT = re.compile(b'\((\w+)\) \[] \(NEW\)')
 
+# Symbol types which appear in the bloat feature (-B). Others are silently
+# dropped when reading in the 'nm' output
+NM_SYMBOL_TYPES = 'tTdDbBr'
+
 """
 Theory of Operation
 
@@ -693,7 +697,7 @@ class Builder:
             parts = line.split()
             if line and len(parts) == 3:
                     size, type, name = line.split()
-                    if type in 'tTdDbB':
+                    if type in NM_SYMBOL_TYPES:
                         # function names begin with '.' on 64-bit powerpc
                         if '.' in name[1:]:
                             name = 'static.' + name.split('.')[0]