Comment # 1 on bug 72064 from Maarten Lankhorst

Affects ubuntu too, adding -fno-optimize-sibling-calls to CXXFLAGS and CFLAGS
for armhf can work around it.

This appears to be a toolchain bug, probably caused by the following code in
radeon_drm_bo.c:

void *radeon_bo_do_map(struct radeon_bo *bo)
{
...
}

static void *radeon_bo_map(struct radeon_winsys_cs_handle *buf,
                           struct radeon_winsys_cs *rcs,
                           enum pipe_transfer_usage usage)
{
    ...
    return radeon_bo_do_map(bo);
}