Undefined symbols when using cmake based build on macOS

[catap]

Hey,

I've discovered a wired issue when I've switched to cmake based build:

:info:build Undefined symbols for architecture x86_64:
:info:build   "_xerbla_", referenced from:
:info:build       _sgemv_ in libopenblas.a(sgemv.c.o)
:info:build       _sger_ in libopenblas.a(sger.c.o)
:info:build       _strsv_ in libopenblas.a(strsv.c.o)
:info:build       _strmv_ in libopenblas.a(strmv.c.o)
:info:build       _ssyr2_ in libopenblas.a(ssyr2.c.o)
:info:build       _sgbmv_ in libopenblas.a(sgbmv.c.o)
:info:build       _ssbmv_ in libopenblas.a(ssbmv.c.o)
:info:build       ...
:info:build      (maybe you meant: _xerbla_array_)
:info:build ld: symbol(s) not found for architecture x86_64

It appears on macOS 10.5 and 10.6 only when build calls gfortran with parameters -fpic -shared -Wl,-all_load -Wl,-force_load,libopenblas.a -Wl,-noall_load.

Since 10.7 this issue do not reproduced, and the major differences that since 10.7 it has libc++ and clang based "world". I not sure how it related, but it seems some condition inside cmake files aren't hold.

Does it ring any bell?

[martin-frbg]

Could be due to some tricks that are played so that xerbla can be overloaded with a user-provided error handler (which is e.g. what some tests use). I'm pretty sure that your libopenblas.a will have a _xerbla_ (even if as a weak symbol), but could you check with nm or equivalent just in case ?

[catap]

Well, it has only U symbols and a lot of them:

leopard:build catap$ nm libopenblas.a | grep _xerbla_ | grep -v 'U'
warning: nm: no name list
warning: nm: no name list
00000000 T _xerbla_array_
leopard:build catap$ nm libopenblas.a | grep _xerbla_ | grep 'U' | wc -l
warning: nm: no name list
warning: nm: no name list
    1785
leopard:build catap$ 

But the same behaviour on macOS 12 as well where it works:

√ build % nm libopenblas.a | grep _xerbla_ | grep -v 'U'
libopenblas.a:xerbla.c.o: no symbols
libopenblas.a:la_constants.f90.o: no symbols
0000000000000000 T _xerbla_array_
√ build % nm libopenblas.a | grep _xerbla_ | grep 'U' | wc -l 
libopenblas.a:xerbla.c.o: no symbols
libopenblas.a:la_constants.f90.o: no symbols
    1785
√ build % 

[catap]

BTW I may try to fix build by -undefined dynamic_lookup, let me take a spin

[catap]

As expected it had been built. Building mumps to confirm that it works as expected. Which includes by dependencies scalapack, scotch and few other things.