Richard W.M. Jones wrote:
 Subject: [PATCH 1/5] Disable -Wunsafe-loop-optimizations
 This warning indicates that GCC could not do a particular sort
 of loop optimization.  It pops up randomly in certain forms of
 looping code, and seems safe to ignore.
 ---
  configure.ac |    2 ++
  1 files changed, 2 insertions(+), 0 deletions(-)
 diff --git a/configure.ac b/configure.ac
 index b28f316..95ab51e 100644
 --- a/configure.ac
 +++ b/configure.ac
 @@ -84,6 +84,8 @@ if test "$gl_gcc_warnings" = yes; then
    nw="$nw -Winline"                 # daemon.h's asprintf_nowarn
    nw="$nw -Wshadow"                 # numerous, plus we're not unanimous
    # ?? -Wstrict-overflow
 +  nw="$nw -Wunsafe-loop-optimizations" # just a warning that an optimization
 +                                    # was not possible, safe to ignore 
ACK.
Unfortunate that they chose such a misleading name.
I agree it is safe to disable it.