[lldb-dev] Tips for building with LLVM_LINK_LLVM_DYLIB=ON

[Tilmann Scheller via lldb-dev]

Hi everyone,

I've filed https://bugs.llvm.org/show_bug.cgi?id=34194 with a script
that produces an LLDB build in the failing configuration and uses it
to run a simple test case. Assuming all dependencies for
Clang/LLVM/LLDB are installed, reproducing the bug should be as simple
as executing the build script.

This seems like a fairly nasty bug (it looks some sort of memory
corruption) that effectively breaks the -DLLVM_LINK_LLVM_DYLIB=ON
build on Linux.

Any help/hints/ideas welcome :)

Regards,

Tilmann

On Sat, Aug 12, 2017 at 6:50 AM, Tom Stellard <tstellar at redhat.com> wrote:
>
> Hi,
>
> We've been having trouble with some strange lldb failures when building lldb
> with -DLLVM_LINK_LLVM_DYLIB=ON.  For example, this command segfaults
> with -DLLVM_LINK_LLVM_DYLIB=ON but not if we omit that option:
>
> echo "int main(void) { return 0; }" |  gcc -x c -g - && \
>    lldb -b a.out -o 'b main' -o 'r' -o 'expr printf("hello")'
>
>
> Does anyone have a working LLVM_LINK_LLVM_DYLIB=ON build and if so,
> could you share the cmake flags you are using?
>
> These are the flags that I used:
>
> -DBUILD_SHARED_LIBS:BOOL=OFF
> -DCMAKE_BUILD_TYPE=Release
> -DLLVM_ENABLE_ASSERTIONS=ON
> -DLLVM_BUILD_LLVM_DYLIB=ON
> -DLLVM_LINK_LLVM_DYLIB=ON
>
> Thanks,
> Tom