I have found a bug in boost/format/feed_args.hpp.
The simple declaration of a static variable in a header like this:
static int x;
Is "allowed" in GCC, but in darwin, when you try to compile this code into a "dll" (dynamic-linking), then link using ld, ld will complain about "common symbols not allowed with MH_DYLIB output format". This may also be the general case with all platforms, but I haven't been able to test this.
The correct solution for the above case is, in all headers use:
extern int x;
And in a single place in the implementation:
int x = 0;
Of course the code in feed_args.hpp doesn't even really NEED a global variable, so as a solution (rather than try to introduce the above complicated change just for one platform), I propose that we change the code:
static const std::basic_string<Ch, Tr> emptyStr;
To:
const std::basic_string<Ch, Tr> emptyStr = "";
Which basically does exactly the same thing.
Here is my patch to feed_args.hpp:
------------------------ feed_args.hpp.patch ------------------------ *** feed_args.hpp Wed Aug 20 18:50:10 2003 --- feed_args.hpp.org Wed Aug 20 18:50:12 2003 *************** *** 34,42 ****
template<class Tr, class Ch> inline
void empty_buf(BOOST_IO_STD basic_ostringstream<Ch,Tr> & os) {
! // PTH 20/8/2003 - need this to NOT be a static for certain compilers.
! // we also don't really need this to be a global variable.
! const std::basic_string<Ch, Tr> emptyStr = "";
os.str(emptyStr);
}
--- 34,40 ----
template<class Tr, class Ch> inline
void empty_buf(BOOST_IO_STD basic_ostringstream<Ch,Tr> & os) {
! static const std::basic_string<Ch, Tr> emptyStr;
os.str(emptyStr);
}
------------------------ feed_args.hpp.patch --------------------------------------------- Paul Hamilton pHamtec P/L - Software Makers http://www.phamtec.com/ mailto:[EMAIL PROTECTED]
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