/[pcre]/code/trunk/pcrecpp.cc
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revision 327 by ph10, Sat Mar 8 17:24:02 2008 UTC revision 328 by ph10, Wed Mar 26 17:39:06 2008 UTC
# Line 59  Arg RE::no_arg((void*)NULL); Line 59  Arg RE::no_arg((void*)NULL);
59    
60  // This is for ABI compatibility with old versions of pcre (pre-7.6),  // This is for ABI compatibility with old versions of pcre (pre-7.6),
61  // which defined a global no_arg variable instead of putting it in the  // which defined a global no_arg variable instead of putting it in the
62  // RE class.  This works on GCC >= 3, at least.  We could probably have  // RE class.  This works on GCC >= 3, at least.  We could probably
63  // a more inclusive test if we ever needed it.  // have a more inclusive test if we ever needed it.  (Note that not
64    // only the __attribute__ syntax, but also __USER_LABEL_PREFIX__, are
65    // gnu-specific.)
66  #if defined(__GNUC__) && __GNUC__ >= 3  #if defined(__GNUC__) && __GNUC__ >= 3
67  extern Arg no_arg __attribute__((alias("_ZN7pcrecpp2RE6no_argE")));  #if defined(__ELF__)
68    extern Arg no_arg
69      __attribute__((alias(__USER_LABEL_PREFIX__ "_ZN7pcrecpp2RE6no_argE")));
70    #else
71    // While we know elf supports strong aliases, not all formats do (Mach
72    // doesn't, for instance).  So make aliases weak by default.  This is
73    // a smidge less safe in theory (conceivably, someone could override
74    // this symbol in their own binary), but perfectly ok in practice.
75    extern Arg no_arg
76      __attribute__((weak, alias(__USER_LABEL_PREFIX__ "_ZN7pcrecpp2RE6no_argE")));
77    #endif
78  #endif  #endif
79    
80  // If a regular expression has no error, its error_ field points here  // If a regular expression has no error, its error_ field points here
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