[cfe-dev] Clang debug linking options on Windows

[Reid Kleckner via cfe-dev]

You're crossing the relase/debug MSVC CRT streams. Make sure all objects in
a given image are using the same CRT.

In your specific example, you should add -D_DEBUG to the command line. You
want to simulate the effect of passing /MTd to cl.exe or clang-cl.exe.

On Fri, Sep 11, 2015 at 10:07 AM, Russell Wallace via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> I'm trying to compile some code via IR and link it with the debug
> libraries on Windows, but getting errors. A minimal test case:
>
> C:\t>type a.cpp
> #define _HAS_EXCEPTIONS 0
> #include <llvm/Support/Signals.h>
>
> int main() {
>   llvm::sys::PrintStackTraceOnErrorSignal();
>   return 0;
> }
>
> C:\t>clang -I/llvm/build/include -I/llvm/include -S -emit-llvm
> -fms-compatibility-version=19 a.cpp
>
> C:\t>clang a.ll \llvm\build\Debug\lib\*.lib
> warning: overriding the module target triple with
> x86_64-pc-windows-msvc18.0.0 [-Woverride-module]
> 1 warning generated.
> LLVMSupport.lib(Signals.obj) : error LNK2038: mismatch detected for
> '_ITERATOR_DEBUG_LEVEL': value '2' doesn't match value '0' in a-db717b.o
> LLVMSupport.lib(Signals.obj) : error LNK2038: mismatch detected for
> 'RuntimeLibrary': value 'MTd_StaticDebug' doesn't match value
> 'MT_StaticRelease' in a-db717b.o
> LLVMSupport.lib(Path.obj) : error LNK2038: mismatch detected for
> '_ITERATOR_DEBUG_LEVEL': value '2' doesn't match value '0' in a-db717b.o
> LLVMSupport.lib(Path.obj) : error LNK2038: mismatch detected for
> 'RuntimeLibrary': value 'MTd_StaticDebug' doesn't match value
> 'MT_StaticRelease' in a-db717b.o
> LLVMSupport.lib(raw_ostream.obj) : error LNK2038: mismatch detected for
> '_ITERATOR_DEBUG_LEVEL': value '2' doesn't match value '0' in a-db717b.o
> ...etc...
>
> There's probably an option that I'm missing?
>
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>
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