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b4f73886c4
Instead of using the arg1_or_junk trick to pick between two choices, with a bit of duplication between the branches (and most of the CONFIG_TPL_BUILD case being redundant, as _IS_TPL is known to be defined to 1 in that case), simply define a prefix that we inject between CONFIG_ and the given config symbol. This only requires one level of indirection (to get the _CONFIG_PREFIX macro expanded before the token concatenation takes place), and makes it easy to, say, introduce a CONFIG_HOSTTOOL_ prefix. [I would expect most HOSTTOOL_ symbols to just be def_bool y, but it would allow us to clean up some of the ifdef HOSTCC mess in the sources shared between U-Boot and host tools.] Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org>
99 lines
3.2 KiB
C
99 lines
3.2 KiB
C
#ifndef __LINUX_KCONFIG_H
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#define __LINUX_KCONFIG_H
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#include <generated/autoconf.h>
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/*
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* Helper macros to use CONFIG_ options in C/CPP expressions. Note that
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* these only work with boolean and tristate options.
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*/
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/*
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* Getting something that works in C and CPP for an arg that may or may
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* not be defined is tricky. Here, if we have "#define CONFIG_BOOGER 1"
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* we match on the placeholder define, insert the "0," for arg1 and generate
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* the triplet (0, 1, 0). Then the last step cherry picks the 2nd arg (a one).
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* When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when
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* the last step cherry picks the 2nd arg, we get a zero.
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*/
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#define __ARG_PLACEHOLDER_1 0,
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#define config_enabled(cfg) _config_enabled(cfg)
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#define _config_enabled(value) __config_enabled(__ARG_PLACEHOLDER_##value)
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#define __config_enabled(arg1_or_junk) ___config_enabled(arg1_or_junk 1, 0)
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#define ___config_enabled(__ignored, val, ...) val
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/*
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* IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',
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* 0 otherwise.
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*
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*/
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#define IS_ENABLED(option) \
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(config_enabled(option) || config_enabled(option##_MODULE))
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/*
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* IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0
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* otherwise. For boolean options, this is equivalent to
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* IS_ENABLED(CONFIG_FOO).
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*/
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#define IS_BUILTIN(option) config_enabled(option)
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/*
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* IS_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0
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* otherwise.
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*/
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#define IS_MODULE(option) config_enabled(option##_MODULE)
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/*
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* U-Boot add-on: Helper macros to reference to different macros
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* (CONFIG_ or CONFIG_SPL_ prefixed), depending on the build context.
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*/
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#if defined(CONFIG_TPL_BUILD)
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#define _CONFIG_PREFIX TPL_
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#elif defined(CONFIG_SPL_BUILD)
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#define _CONFIG_PREFIX SPL_
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#else
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#define _CONFIG_PREFIX
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#endif
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#define config_val(cfg) _config_val(_CONFIG_PREFIX, cfg)
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#define _config_val(pfx, cfg) __config_val(pfx, cfg)
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#define __config_val(pfx, cfg) CONFIG_ ## pfx ## cfg
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/*
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* CONFIG_VAL(FOO) evaluates to the value of
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* CONFIG_FOO if CONFIG_SPL_BUILD is undefined,
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* CONFIG_SPL_FOO if CONFIG_SPL_BUILD is defined.
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* CONFIG_TPL_FOO if CONFIG_TPL_BUILD is defined.
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*/
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#define CONFIG_VAL(option) config_val(option)
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/*
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* CONFIG_IS_ENABLED(FOO) evaluates to
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* 1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y' or 'm',
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* 1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y' or 'm',
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* 1 if CONFIG_TPL_BUILD is defined and CONFIG_TPL_FOO is set to 'y' or 'm',
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* 0 otherwise.
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*/
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#define CONFIG_IS_ENABLED(option) \
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(config_enabled(CONFIG_VAL(option)) || \
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config_enabled(CONFIG_VAL(option##_MODULE)))
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/*
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* CONFIG_IS_BUILTIN(FOO) evaluates to
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* 1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y',
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* 1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y',
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* 0 otherwise.
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*/
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#define CONFIG_IS_BUILTIN(option) config_enabled(CONFIG_VAL(option))
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/*
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* CONFIG_IS_MODULE(FOO) evaluates to
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* 1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'm',
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* 1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'm',
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* 0 otherwise.
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*/
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#define CONFIG_IS_MODULE(option) config_enabled(CONFIG_VAL(option##_MODULE))
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#endif /* __LINUX_KCONFIG_H */
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