mpg123-1.32.4

src/common/abi_align.h

@@ -0,0 +1,50 @@
+/*
+	abi_align: ABI and alignment stuff for library builds.
+
+	Original use was the definitions for avoiding breakage because of mixing
+	compilers with different alignment. Then, the switchery for building
+	DLLs got lumped in.
+
+	copyright 1995-2023 by the mpg123 project
+	free software under the terms of the LGPL 2.1
+	see COPYING and AUTHORS files in distribution or http://mpg123.org
+
+	There used to be code that checks alignment, but it did not really
+	work anyway. The only straw we have is putting that alignment
+	attribute to API functions.
+*/
+
+#ifndef MPG123_H_ABI_ALIGN
+#define MPG123_H_ABI_ALIGN
+
+#include "config.h"
+
+// Building any of our libs on/for Windows needs this before
+// including the main API header (define MPG123_EXPORT).
+#if defined(WIN32) && defined(DYNAMIC_BUILD)
+#define BUILD_MPG123_DLL
+#endif
+
+/* ABI conformance for other compilers.
+   mpg123 needs 16byte-aligned (or more) stack for SSE and friends.
+   gcc provides that, but others don't necessarily. */
+#ifdef ABI_ALIGN_FUN
+
+#ifndef attribute_align_arg
+
+#if defined(__GNUC__) && (__GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__>1)
+#    define attribute_align_arg __attribute__((force_align_arg_pointer))
+/* The gcc that can align the stack does not need the check... nor does it work with gcc 4.3+, anyway. */
+#else
+#    define attribute_align_arg
+#endif
+
+#endif  /* attribute_align_arg */
+
+#else /* ABI_ALIGN_FUN */
+
+#define attribute_align_arg
+
+#endif /* ABI_ALIGN_FUN */
+
+#endif /* MPG123_H_ABI_ALIGN */