mirror of https://github.com/moparisthebest/wget
80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
/* Some autoconf-unrelated preprocessor magic that needs to be done
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*before* including the system includes and therefore cannot belong
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in sysdep.h.
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Everything else related to system tweaking belongs to sysdep.h.
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This file is included at the bottom of config.h. */
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/* Testing for __sun is not enough because it's also defined on SunOS. */
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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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#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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/* Under glibc-based systems we want all GNU extensions as well. This
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declares some unnecessary cruft, but also useful functions such as
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timegm, FNM_CASEFOLD extension to fnmatch, memrchr, etc. */
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#define _GNU_SOURCE
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#endif /* NAMESPACE_TWEAKS */
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/* Alloca declaration, based on recommendation in the Autoconf manual.
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These have to be after the above namespace tweaks, but before any
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non-preprocessor code. */
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#if HAVE_ALLOCA_H
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# include <alloca.h>
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#elif defined WINDOWS
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# include <malloc.h>
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# ifndef alloca
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# define alloca _alloca
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# endif
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#elif defined __GNUC__
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# define alloca __builtin_alloca
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#elif defined _AIX
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# define alloca __alloca
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#else
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# include <stddef.h>
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# ifdef __cplusplus
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extern "C"
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# endif
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void *alloca (size_t);
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#endif
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