[LLVMdev] Link error with TOOLLINKOPTS=-ldbghelp on MinGW

[John Criswell]

Henrik Bach wrote:
>> From: John Criswell <criswell at cs.uiuc.edu>
> 
> 
>> Will this library be needed for tblgen or for all LLVM programs?  And 
>> is it a library you wrote for LLVM, or is it a MingW library?
> 
> 
> It's is generally needed for all programs or at least programs using 
> Signals.o (from platform/Signals.cpp) and it is platform/MinGW specific.

Okay.

> 
>> TOOLLINKOPTS is used by configure to convey additional linker flags 
>> needed to use system libraries.  These are typically system libraries 
>> for which a -L option is not needed or has already been supplied to 
>> the configure script.
> 
> 
> Ok.
> 
>> For libraries internal to LLVM, we add the library to the USEDLIBS 
>> variable in the program's Makefile.
>>
>> How we should handle the problem depends upon whether this will be 
>> needed for all programs and whether libdbghelp  will be part of the 
>> LLVM source tree.
> 
> 
> Ok. However, the libdgbhelp isn't provided (so far, though you have 
> access to the system interface through header files) on MinGW. But, you 
> have the option to make your own libraries from system dll's on MinGW. 
> For LLVM, libdbghelp is an external system specific library, so I don't 
> think it should be a part of the LLVM source tree.

So, if I'm understanding you correctly, libdgbhelp is a library that 
doesn't come with MinGW but can be installed on MinGW by the user if it 
is needed.  Am I correct?

If that's the case, I would say that it's the user's reponsibility to 
install the library into /usr/lib or provide the configure script with 
the appropriate -L options to find it (via the LDFLAGS environment 
variable).

-- John T.


> 
> Henrik
> 
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-- 
*********************************************************************
* John T. Criswell                         Email: criswell at uiuc.edu *
* Research Programmer                                               *
* University of Illinois at Urbana-Champaign                        *
*                                                                   *
* "It's today!" said Piglet. "My favorite day," said Pooh.          *
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