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54 lines
1.9 KiB
54 lines
1.9 KiB
#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_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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* IS_REACHABLE(CONFIG_FOO) evaluates to 1 if the currently compiled |
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* code can call a function defined in code compiled based on CONFIG_FOO. |
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* This is similar to IS_ENABLED(), but returns false when invoked from |
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* built-in code when CONFIG_FOO is set to 'm'. |
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*/ |
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#define IS_REACHABLE(option) (config_enabled(option) || \ |
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(config_enabled(option##_MODULE) && config_enabled(MODULE))) |
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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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#define IS_ENABLED(option) \ |
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(IS_BUILTIN(option) || IS_MODULE(option)) |
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#endif /* __LINUX_KCONFIG_H */
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