> On the SPU, mmap is indeed not available. Before that change, it was still > possible to build libgfortran for SPU ... > > Is the intent to now require mmap on every system that supports libgfortran, > or should use of mmap in libbacktrace be optional in some form?
The idea is that libbacktrace should be able to build on all targets, at least in a minimally-functional form: https://gcc.gnu.org/ml/gcc/2015-08/msg00038.html libgfortran should continue to build on all targets, even those that don’t have an mmap(). I see that there is a test in libbacktrace/configure.ac for mmap(), but apparently it fails on your system: -------------------------------- AC_CHECK_HEADERS(sys/mman.h) if test "$ac_cv_header_sys_mman_h" = "no"; then have_mmap=no else if test -n "${with_target_subdir}"; then # When built as a GCC target library, we can't do a link test. We # simply assume that if we have mman.h, we have mmap. have_mmap=yes else AC_CHECK_FUNC(mmap, [have_mmap=yes], [have_mmap=no]) fi fi -------------------------------- So this should be the place to patch things up. Relying on the presence of <sys/mman.h> is apparently not restrictive enough. Maybe we could use a AC_EGREP_HEADER test, as is currently done for dl_interate_phdr()? FX
