[Bug fortran/68358] Some tests in gfortran.dg fail when compiled with '-g -flto' and Xcode 7

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68358

--- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Created attachment 36829
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36829&action=edit
Reduced test case for gfortran.dg/minlocval_3.f90

With the attached test the warnings with '-g -flto' are

warning: (x86_64)  could not find object file symbol for symbol _A.28.3542
warning: (x86_64)  could not find object file symbol for symbol _A.36.3560
warning: (x86_64)  could not find object file symbol for symbol _A.44.3580
warning: (x86_64)  could not find object file symbol for symbol _A.50.3594
warning: (x86_64)  could not find object file symbol for symbol _A.56.3608
warning: (x86_64)  could not find object file symbol for symbol _A.62.3622
warning: (x86_64)  could not find object file symbol for symbol _A.68.3636
warning: (x86_64)  could not find object file symbol for symbol _A.74.3650
warning: (x86_64)  could not find object file symbol for symbol _A.80.3664
warning: (x86_64)  could not find object file symbol for symbol _A.86.3678
warning: (x86_64)  could not find object file symbol for symbol _A.92.3690
warning: (x86_64)  could not find object file symbol for symbol _A.102.3710
warning: (x86_64)  could not find object file symbol for symbol _A.123.3779
warning: (x86_64)  could not find object file symbol for symbol _A.131.3805
warning: (x86_64)  could not find object file symbol for symbol _A.154.3862
warning: (x86_64)  could not find object file symbol for symbol _A.164.3882
warning: (x86_64)  could not find object file symbol for symbol _A.174.3905
warning: (x86_64)  could not find object file symbol for symbol _A.190.3938
warning: (x86_64)  could not find object file symbol for symbol _A.206.3971
warning: (x86_64)  could not find object file symbol for symbol _A.222.4004
warning: (x86_64)  could not find object file symbol for symbol _A.238.4034
warning: (x86_64)  could not find object file symbol for symbol _A.250.4057

These warnings disappear if I remove a single 'if'.