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68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
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/* Some autoconf-unrelated preprocessor magic that needs to be done
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before including the system includes and therefore cannot belong in
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sysdep.h. This file is included at the bottom of config.h. */
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/* Alloca-related defines, straight out of the Autoconf manual. */
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/* AIX requires this to be the first thing in the file. */
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#ifndef __GNUC__
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# if HAVE_ALLOCA_H
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# include <alloca.h>
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# else
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# ifdef _AIX
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#pragma alloca
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# else
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# ifndef alloca /* predefined by HP cc +Olibcalls */
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char *alloca ();
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# endif
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# endif
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# endif
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#endif
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#ifdef __sun
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# ifdef __SVR4
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# define solaris
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# endif
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#endif
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/* The "namespace tweaks" below attempt to set a friendly "compilation
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environment" under popular operating systems. Default compilation
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environment often means that some functions that are "extensions"
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are not declared -- `strptime' is one example.
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But non-default environments can expose bugs in the system header
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files, crippling compilation in _very_ non-obvious ways. Because
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of that, we define them only on well-tested architectures where we
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know they will work. */
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#undef NAMESPACE_TWEAKS
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#ifdef solaris
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# define NAMESPACE_TWEAKS
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# ifdef __GNUC__
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/* Prevent stdio.h from declaring va_list and thus tripping gcc's
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stdarg.h. */
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# define _VA_LIST
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# endif
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#endif
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#ifdef __linux__
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# define NAMESPACE_TWEAKS
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#endif
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#ifdef NAMESPACE_TWEAKS
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/* Request the "Unix 98 compilation environment". */
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#define _XOPEN_SOURCE 500
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/* For Solaris: request everything else that is available and doesn't
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conflict with the above. */
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#define __EXTENSIONS__
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/* For Linux: request features of 4.3BSD and SVID (System V Interface
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Definition). */
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#define _SVID_SOURCE
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#define _BSD_SOURCE
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#endif /* NAMESPACE_TWEAKS */
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