Re: multiple definitions errors
Re: multiple definitions errors
- Subject: Re: multiple definitions errors
- From: Dan Korn <email@hidden>
- Date: Thu, 26 Jun 2008 10:49:59 -0500
Okay, I'll try asking this another way:
How can I prevent my dynamic library from exporting every single
function?
Any tips would be greatly appreciated. Even if the answer is RTFM, a
nudge in the right direction towards a particular document would be
very helpful.
Thanks,
Dan
On Jun 25, 2008, at 6:17 PM, Dan Korn wrote:
I have an Xcode 2.5 project which builds a bundle (an Acrobat plug-
in), which in turn links with multiple static libraries, also built
with Xcode 2.5, all from C++ code. I'm trying to convert one of the
static libraries to a dynamic library, but I'm having trouble
getting it to link.
Here's the scenario: The main bundle project links to a static
library (libfmstatus_macho_d.lib) and a dynamic library
(libfpunicodeui_macho_d.lib). Both of these libraries link in turn
to another static library (let's call it "S2"). When I go to link
my main project, I'm getting "multiple definition" errors for just
about every symbol in library S2. For instance:
/Xcode2.5/usr/bin/../libexec/gcc/i686-apple-darwin8/4.0.1/ld:
multiple definitions of symbol vtable for MFC2PP::CComboBox
/Projects/FusionPro-mainline/FusionProWorkspace/FusionProMac/
FusionPro/fmstatus/build/Debug/Default/
libfmstatus_macho_d.lib(CComboBox.o) definition of vtable for
MFC2PP::CComboBoxin section (__DATA,__const)
/Projects/FusionPro-mainline/FusionProWorkspace/FusionProMac/
FusionPro/FPUnicodeUI/build/Debug/Default/
libfpunicodeui_macho_d.lib(CComboBox.o) private external definition
of vtable for MFC2PP::CComboBoxin section (__DATA,__const)
Here's another one that's a little different:
/Xcode2.5/usr/bin/../libexec/gcc/i686-apple-darwin8/4.0.1/ld:
multiple definitions of symbol MFC2PP::CComboBoxView::DisableSelf()
/Projects/FusionPro-mainline/FusionProWorkspace/FusionProMac/
FusionPro/fmstatus/build/Debug/Default/
libfmstatus_macho_d.lib(CComboBox.o) definition of
MFC2PP::CComboBoxView::DisableSelf() in section (__TEXT,__text)
/Projects/FusionPro-mainline/FusionProWorkspace/FusionProMac/
FusionPro/FPUnicodeUI/build/Debug/Default/
libfpunicodeui_macho_d.lib(CComboBox.o) private external definition
of MFC2PP::CComboBoxView::DisableSelf() in section
(__TEXT,__text)
(Many more like these two.)
In all four of the projects, I have "Symbols hidden by
default" [GCC_SYMBOLS_PRIVATE_EXTERN, -fvisibility=hidden] checked.
It's my understanding that this should prevent anything at all from
being exported from a dynamic library, unless I use an export list
file or a "#pragma GCC visibility" or
__attribute__((visibility("xxx"))) specifier, none of which I am
using.
I've poured over this:
<http://developer.apple.com/documentation/DeveloperTools/Conceptual/CppRuntimeEnv/Articles/SymbolVisibility.html
>
But I can't seem to do anything to prevent the dynamic library from
exporting just about everything. What am I missing here?
Thanks,
Dan
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