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importc: add alignof macro #3840

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importc: add alignof macro #3840

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455ce8e
Add alignof macro
ryuukk Jun 15, 2022
bc7ce91
Correct align of macro for both gcc/clang
ryuukk Jun 26, 2022
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10 changes: 10 additions & 0 deletions src/importc.h
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Original file line number Diff line number Diff line change
Expand Up @@ -55,3 +55,13 @@
* Define it to do what other C compilers do.
*/
#define __builtin_offsetof(t,i) ((typeof(sizeof(0)))((char *)&((t *)0)->i - (char *)0))

/****************************
* Define it to do what other C compilers do.
*/
#define _Alignof(type) __builtin_offsetof(struct { char c; type member; }, member)
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Remove this


/****************************
* clang's preprocessor generates __alignof instead
*/
#define __alignof _Alignof