autoconfig.mk: Make it possible to define configs from other configs

Give more flexibility to define configs that can be interpreted by make, e.g. to
define fallback values of configs like in the example below.

Before this change, the config lines:
 #define CONFIG_SPL_MAX_SIZE	2048
 #define CONFIG_SPL_PAD_TO	CONFIG_SPL_MAX_SIZE
would have been changed in autoconfig.mk into:
 CONFIG_SPL_MAX_SIZE=2048
 CONFIG_SPL_PAD_TO="CONFIG_SPL_MAX_SIZE"

Hence, a make recipe using as an argument to $(OBJCOPY):
 --pad-to=$(CONFIG_SPL_PAD_TO)
would have issued:
 --pad-to="CONFIG_SPL_MAX_SIZE"
which means nothing for $(OBJCOPY) and makes it fail.

Thanks to this change, the config lines above are changed in autoconfig.mk into:
 CONFIG_SPL_MAX_SIZE=2048
 CONFIG_SPL_PAD_TO=$(CONFIG_SPL_MAX_SIZE)

Hence, the make recipe above now issues:
 --pad-to=2048
as expected from the defined config.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Reviewed-by: Tom Rini <trini@ti.com>

diff --git a/tools/scripts/define2mk.sed b/tools/scripts/define2mk.sed
index 13e2845e76f013fdfe89515bb4ae1adb70453f82..c641edfb0194ba81195e930b668c6250c90072d8 100644 (file)
--- a/tools/scripts/define2mk.sed
+++ b/tools/scripts/define2mk.sed
@@ -24,6 +24,8 @@
        s/="\([0-9][0-9]*\)"/=\1/;
        # ... and from hex numbers
        s/="\(0[Xx][0-9a-fA-F][0-9a-fA-F]*\)"/=\1/;
+       # ... and from configs defined from other configs
+       s/="\(CONFIG_[A-Za-z0-9_][A-Za-z0-9_]*\)"/=$(\1)/;
        # Change '1' and empty values to "y" (not perfect, but
        # supports conditional compilation in the makefiles
        s/=$/=y/;