Add support for KCONFIG_ALLCONFIG

This allows some symbol values to be forced while running
all{def,no,yes,mod}config.py. See Documentation/kbuild/kconfig.txt in
the Linux kernel.

Add a helper function load_allconfig() to Kconfiglib to avoid code
duplication in the tools.

Also add functions for enabling/disabling the warning that's generated
when a symbol is assigned multiple times in a (set of) .config files and
the values differ. It should be disabled when merging the
KCONFIG_ALLCONFIG configuration file. Previously, only the warning
generated when the assigned values are identical could be disabled.

Disable all warnings related to assigning a symbol multiple times in
examples/merge_config.py as well.

1 files changed, 3 insertions, 1 deletions

diff --git a/allnoconfig.py b/allnoconfig.py
index 4e1c228..1ef6e27 100755
--- a/allnoconfig.py
+++ b/allnoconfig.py
@@ -30,9 +30,11 @@ def main():
     #    accept 0/1/2, for n/m/y). The assignments will be ignored for other
     #    symbol types, which is what we want.
     kconf.disable_warnings()
-
     for sym in kconf.unique_defined_syms:
         sym.set_value(2 if sym.is_allnoconfig_y else 0)
+    kconf.enable_warnings()
+
+    kconfiglib.load_allconfig(kconf, "allno.config")
 
     kconf.write_config(kconfiglib.standard_config_filename())