Re: [Boost-users] boost::filesystem exception not caught on MacOS X

From: Lothar May (l-may_at_[hidden])
Date: 2007-12-09 06:36:38

Hi,

Marshall Clow wrote:
> The basic problem is that when the runtime compares type_info's to 
> see if a catch block can catch the exception, it compares to see _if 
> they have the same address_. This fails, of course, if a shared 
> library and an application each have their own copy of the type_info 
> structure. Mucking with the visibility of the symbols (your "loads of 
> linker warnings" ) can fix this.

I have fixed the linker warnings, but the exception is still not caught.
I tried two different things:

1) Compile the test application using -fvisibility=hidden according to
known issues:
http://developer.apple.com/releasenotes/DeveloperTools/RN-Id/index.html

g++ test.cpp -fvisibility=hidden -lboost_filesystem-mt-1_34_1 -o test

No more linker warnings will show up, but the exception still won't be
caught.

2) Compile the static boost libs with -fvisibility=default (by patching
the build file) and then

g++ test.cpp -lboost_filesystem-mt-1_34_1 -o test

Again, no linker warnings about visibility, but still the exception is
not caught.

I'm definitely using the static libs. Any hints?

Regards,

Lothar