51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/*
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abi_align: ABI and alignment stuff for library builds.
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Original use was the definitions for avoiding breakage because of mixing
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compilers with different alignment. Then, the switchery for building
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DLLs got lumped in.
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copyright 1995-2023 by the mpg123 project
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free software under the terms of the LGPL 2.1
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see COPYING and AUTHORS files in distribution or http://mpg123.org
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There used to be code that checks alignment, but it did not really
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work anyway. The only straw we have is putting that alignment
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attribute to API functions.
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*/
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#ifndef MPG123_H_ABI_ALIGN
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#define MPG123_H_ABI_ALIGN
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#include "config.h"
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// Building any of our libs on/for Windows needs this before
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// including the main API header (define MPG123_EXPORT).
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#if defined(WIN32) && defined(DYNAMIC_BUILD)
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#define BUILD_MPG123_DLL
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#endif
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/* ABI conformance for other compilers.
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mpg123 needs 16byte-aligned (or more) stack for SSE and friends.
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gcc provides that, but others don't necessarily. */
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#ifdef ABI_ALIGN_FUN
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#ifndef attribute_align_arg
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#if defined(__GNUC__) && (__GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__>1)
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# define attribute_align_arg __attribute__((force_align_arg_pointer))
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/* The gcc that can align the stack does not need the check... nor does it work with gcc 4.3+, anyway. */
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#else
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# define attribute_align_arg
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#endif
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#endif /* attribute_align_arg */
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#else /* ABI_ALIGN_FUN */
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#define attribute_align_arg
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#endif /* ABI_ALIGN_FUN */
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#endif /* MPG123_H_ABI_ALIGN */
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