Bug#1125102: deal.ii: FTBFS on arm64: collect2: fatal error: ld terminated with signal 6 [Aborted]

[Emanuele Rocca]

Hey Graham,

On 2026-01-09 10:07, Graham Inggs wrote:
> when linking with ld.bfd (as in 9.7.1-2) the build times out, but I
> have also seen:
> 
> relocation truncated to fit: R_AARCH64_CALL26 against symbol
> `dealii::ExceptionBase::ExceptionBase()' defined in .text section in
> base/CMakeFiles/object_base_debug.dir/exceptions.cc.o

It seems that building without outline atomics is a possible workaround,
so on arm64 you could try:

export DEB_CXXFLAGS_MAINT_APPEND=-mno-outline-atomics

The build times out for me, with an ld process maxing out one core for a
long time, but at least I get no relocation failures!