[libical] How I got libical 0.46 to build on Windoze with Visual Studio 2005

[andrew.marlow at uk.bnpparibas.com]

At long last I have managed to get libical 0.46 built on windoze using 
VC8. I had to hack a couple of libical source files. I reckon these will 
need to go into the official source at some point.

First, I changed vsnprintf.h after the #include <stdarg.h> statement (line 
8). I added

#if !defined(_MSC_VER)

and added the closing #endif after the snprintf decl at the end.

This is necessary because VC8 does not define the __STDC__ macro as it 
should. One cannot define it in the CMake because this makes other things 
fail. Other VC headers expect it to be not defined basically and it causes 
problems for some of the macros in fcntl.h.

It may be that at some version of Visual Studio this macro gets defined 
correctly. I don't know. VC8 is all I have so I cannot check this easily. 
A full fix might involve checking the value of _MSC_VER.

Then I had to edit ical.def. I removed all the occurences of 
simple_str_to_float,, a routine that seems to no longer exist. This made 
libical build. But the test program regression failed to link due to 
missing symbol _icaltimezone_set_tzid_prefix. I added 
icaltimezone_set_tzid_prefix to the end of ical.def and rebuilt and this 
made everything build ok.

I am puzzled by the reports of everyone else being able to build libical 
on windoze ok, given the problems I have found above. Maybe these problems 
are peculiar to VC8. Hmmm.

Regards,

Andrew Marlow

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