[R-SIG-Mac] lldb not finding libRblas.dylib

[Prof Brian Ripley]

On 25/04/2022 14:09, Duncan Murdoch wrote:
> I wanted to debug an error in my attempt to fix PR#18328, but I can't 
> seem to run R under lldb:
> 
> 
> murdoch using djmair3 ~/R/R-devel
> $ bin/R -d lldb
> (lldb) target create "/Users/murdoch/R/R-devel/bin/exec/R"
> Current executable set to '/Users/murdoch/R/R-devel/bin/exec/R' (x86_64).
> (lldb) run
> Process 98432 launched: '/Users/murdoch/R/R-devel/bin/exec/R' (x86_64)
> dyld: Library not loaded: libRblas.dylib
>    Referenced from: /Users/murdoch/R/R-devel/bin/exec/R
>    Reason: image not found
> Process 98432 stopped
> * thread #1, stop reason = signal SIGABRT
>      frame #0: 0x00000001004fe05e dyld`__abort_with_payload + 10
> dyld`__abort_with_payload:
> ->  0x1004fe05e <+10>: jae    0x1004fe068               ; <+20>
>      0x1004fe060 <+12>: movq   %rax, %rdi
>      0x1004fe063 <+15>: jmp    0x1004fc588               ; cerror_nocancel
>      0x1004fe068 <+20>: retq
> Target 0: (R) stopped.
> 
> This is on an Intel Mac running Catalina, 10.15.7.  I have the current 
> svn source, r82250, with only src/main/gram.c and src/main/gram.y 
> changed.  If I look in the R-devel directory after building, I do find 
> the file:
> 
> $ find . -name libRblas.dylib
> ./lib/libRblas.dylib
> ./src/extra/blas/libRblas.dylib
> 
> Can anyone suggest what is going wrong?

Looks like §4.4.3 of R-exts.  Have you tried the workarounds there?

I almost always attach a debugger on macOS, as suggested there.

I believe this is a self-build, but

https://cran.r-project.org/bin/macosx/RMacOSX-FAQ.html#I-cannot-attach-debugger-to-R

is worth knowing about if you ever want to debug a binary version of R.

-- 
Brian D. Ripley,                  ripley using stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford