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911a70381a
Distribute everything from `libm/` to better locations in the repo. `libm/libm/*` has not moved yet to avoid Git seeing the move as an edit to `Cargo.toml`. Files that remain to be merged somehow are in `etc/libm`.
40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
/* This is meant to override Musl's src/include/features.h
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*
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* We use a separate file here to redefine some attributes that don't work on
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* all platforms that we would like to build on.
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*/
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#ifndef FEATURES_H
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#define FEATURES_H
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/* Get the required `#include "../../include/features.h"` since we can't use
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* the relative path. The C macros need double indirection to get a usable
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* string. */
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#define _stringify_inner(s) #s
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#define _stringify(s) _stringify_inner(s)
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#include _stringify(ROOT_INCLUDE_FEATURES)
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#if defined(__APPLE__)
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#define weak __attribute__((__weak__))
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#define hidden __attribute__((__visibility__("hidden")))
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/* We _should_ be able to define this as:
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* _Pragma(_stringify(weak musl_ ## new = musl_ ## old))
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* However, weak symbols aren't handled correctly [1]. So we manually write
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* wrappers, which are in `alias.c`.
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*
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* [1]: https://github.com/llvm/llvm-project/issues/111321
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*/
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#define weak_alias(old, new) /* nothing */
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#else
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#define weak __attribute__((__weak__))
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#define hidden __attribute__((__visibility__("hidden")))
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#define weak_alias(old, new) \
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extern __typeof(old) musl_ ## new \
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__attribute__((__weak__, __alias__(_stringify(musl_ ## old))))
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#endif /* defined(__APPLE__) */
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#endif
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