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http://bugs.exim.org/show_bug.cgi?id=664
--- Comment #26 from Craig Silverstein <csilvers@???> 2008-03-27 22:15:21 ---
Attached below is the patch to make __USER_LABEL_PREFIX__ compile
correctly. This does not solve the "alias definitions are not
supported in Mach-O" warning, but at least it lets the code compile
better.
We still get, in leopard, this error:
pcrecpp.cc:79: error: 'pcrecpp::no_arg' aliased to undefined symbol
'__ZN7pcrecpp2RE6no_argE'
This seems to be a bug in gcc 4.0.1; at least, I don't see the error
when compiling with gcc 4.0.3. Reports on the web indicate it works
fine with gcc 3 as well.
I don't quite know how to proceed. I think we may have to either give
up on backwards-ABI-compatibility for leopard (and any other mac
system that uses gcc 4.0.1), or else revert this patch and go back to
having the windows problem.
craig
--cut here--
Index: pcrecpp.cc
===================================================================
--- pcrecpp.cc (revision 328)
+++ pcrecpp.cc (working copy)
@@ -64,18 +64,21 @@
// only the __attribute__ syntax, but also __USER_LABEL_PREFIX__, are
// gnu-specific.)
#if defined(__GNUC__) && __GNUC__ >= 3
-#if defined(__ELF__)
+# define AS_STRING(x) AS_STRING_INTERNAL(x)
+# define AS_STRING_INTERNAL(x) #x
+# define USER_LABEL_PREFIX AS_STRING(__USER_LABEL_PREFIX__)
+# if defined(__ELF__)
extern Arg no_arg
- __attribute__((alias(__USER_LABEL_PREFIX__ "_ZN7pcrecpp2RE6no_argE")));
-#else
+ __attribute__((alias(USER_LABEL_PREFIX "_ZN7pcrecpp2RE6no_argE")));
+# else
// While we know elf supports strong aliases, not all formats do (Mach
// doesn't, for instance). So make aliases weak by default. This is
// a smidge less safe in theory (conceivably, someone could override
// this symbol in their own binary), but perfectly ok in practice.
extern Arg no_arg
- __attribute__((weak, alias(__USER_LABEL_PREFIX__
"_ZN7pcrecpp2RE6no_argE")));
+ __attribute__((weak, alias(USER_LABEL_PREFIX "_ZN7pcrecpp2RE6no_argE")));
+# endif
#endif
-#endif
// If a regular expression has no error, its error_ field points here
static const string empty_string;
--
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