The alignment for longs on s390x is 8. That's the only place where it differs from the default alignments found in configure already. The example alignment program from Laurent printed the following on a real s390x:
alignof(short) 2 alignof(int) 4 alignof(long) 8 alignof(long long) 8 Signed-off-by: Alexander Graf <ag...@suse.de> --- configure | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/configure b/configure index faaed60..1e068e6 100755 --- a/configure +++ b/configure @@ -3182,6 +3182,7 @@ case "$target_arch2" in s390x) target_nptl="yes" target_phys_bits=64 + target_long_alignment=8 ;; *) echo "Unsupported target CPU" -- 1.6.0.2