7bfa88f315
For each CONFIG_SYMBOL, include/bb_config.h now has both ENABLE_SYMBOL
and USE_SYMBOL(x). ENABLE_SYMBOL is still always defined (1 or 0) so that
if(ENABLE) should optimize out when it's zero. The USE_SYMBOL(X) will only
splice in X if the symbol is defined, otherwise it'll be empty.
Thus we can convert this:
#ifdef CONFIG_ARGS
opt = bb_getopt_ulflags(argc, argv, "ab:c"
#ifdef CONFIG_THINGY
"d:"
#endif
, &bvalue
#ifdef CONFIG_THINGY
, &thingy
#endif
);
#endif
into this:
if (ENABLE_ARGS) {
opt = bb_getopt_ulflags(argc, argv, "ab:c" USE_THINGY("d:"), &bvalue
USE_THINGY(, &thingy));
}
And it should produce the same code.
Unlike the old versions in include/_usage.h, the new USE_SYMBOL(x) can handle
commas in its arguments (as shown above). (The _usage.h file is obsolete and
no longer generated.)
Nobody should need to include config.h directly anymore, bb_config.h should
define all the configuration stuff we need. Someday, the CONFIG_SYMBOL
versions should go away in favor of ENABLE_SYMBOL and USE_SYMBOL().
Thanks to vodz for the new version of bb_mkdep.c that works with function
macros.
82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/*
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Copyright 2006, Bernhard Fischer
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Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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#ifndef __PLATFORM_H
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#define __PLATFORM_H 1
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/* Convenience macros to test the version of gcc. */
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#undef __GNUC_PREREQ
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#if defined __GNUC__ && defined __GNUC_MINOR__
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# define __GNUC_PREREQ(maj, min) \
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((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
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#else
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# define __GNUC_PREREQ(maj, min) 0
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#endif
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/* __restrict is known in EGCS 1.2 and above. */
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#if !__GNUC_PREREQ (2,92)
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# ifndef __restrict
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# define __restrict /* Ignore */
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# endif
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#endif
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/* Define macros for some gcc attributes. This permits us to use the
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macros freely, and know that they will come into play for the
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version of gcc in which they are supported. */
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#if !__GNUC_PREREQ (2,7)
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# ifndef __attribute__
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# define __attribute__(x)
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# endif
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#endif
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#if 0
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/* Attribute __malloc__ on functions was valid as of gcc 2.96. */
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#ifndef ATTRIBUTE_MALLOC
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# if __GNUC_PREREQ (2,96)
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# define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
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# else
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# define ATTRIBUTE_MALLOC
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# endif /* GNUC >= 2.96 */
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#endif /* ATTRIBUTE_MALLOC */
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#endif
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#ifndef ATTRIBUTE_UNUSED
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#define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
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#endif /* ATTRIBUTE_UNUSED */
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#ifndef ATTRIBUTE_NORETURN
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#define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
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#endif /* ATTRIBUTE_NORETURN */
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#ifndef ATTRIBUTE_PACKED
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#define ATTRIBUTE_PACKED __attribute__ ((__packed__))
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#endif /* ATTRIBUTE_NORETURN */
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#ifndef ATTRIBUTE_ALIGNED
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#define ATTRIBUTE_ALIGNED(m) __attribute__ ((__aligned__(m)))
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#endif /* ATTRIBUTE_ALIGNED */
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/* -fwhole-program makes all symbols local. The attribute externally_visible
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forces a symbol global. */
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#ifndef ATTRIBUTE_EXTERNALLY_VISIBLE
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# if __GNUC_PREREQ (4,1)
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# define ATTRIBUTE_EXTERNALLY_VISIBLE __attribute__ ((__externally_visible__))
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# else
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# define ATTRIBUTE_EXTERNALLY_VISIBLE
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# endif /* GNUC >= 4.1 */
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#endif /* ATTRIBUTE_EXTERNALLY_VISIBLE */
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/* We use __extension__ in some places to suppress -pedantic warnings
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about GCC extensions. This feature didn't work properly before
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gcc 2.8. */
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#if !__GNUC_PREREQ (2,8)
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# ifndef __extension__
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# define __extension__
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# endif
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#endif
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#endif /* platform.h */
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