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core/lib: define MAYBE_UNUSED #18884

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merged 2 commits into from
Nov 22, 2022
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core/lib: define MAYBE_UNUSED #18884

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core/lib: compiler_hints guard NORETURN and PURE
kfessel Nov 11, 2022
b4feefa
core/lib: define MAYBE_UNUSED
kfessel Nov 11, 2022
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17 changes: 17 additions & 0 deletions core/lib/include/compiler_hints.h
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Original file line number Diff line number Diff line change
Expand Up @@ -30,11 +30,13 @@ extern "C" {
* @brief The *NORETURN* keyword tells the compiler to assume that the function
* cannot return.
*/
#ifndef NORETURN
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#ifdef __GNUC__
#define NORETURN __attribute__((noreturn))
#else
#define NORETURN
#endif
#endif

/**
* @def PURE
Expand All @@ -43,11 +45,26 @@ extern "C" {
* function can be subject to common subexpression elimination and loop
* optimization just as an arithmetic operator would be.
*/
#ifndef PURE
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#ifdef __GNUC__
#define PURE __attribute__((pure))
#else
#define PURE
#endif
#endif

/**
* @def MAYBE_UNUSED
* @brief tell the compiler something may be unused
* static functions, function arguments, local variables
*/
#ifndef MAYBE_UNUSED
#ifdef __GNUC__
#define MAYBE_UNUSED __attribute__((unused))
#else
#define MAYBE_UNUSED
#endif
#endif

/**
* @def UNREACHABLE()
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