[Bug lto/59723] [4.9 Regression] ICE: in lto_output_tree, at lto-streamer-out.c:1390 when compiling some Fortran tests with -flto

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59723

--- Comment #7 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> ... which implies that the GCC testsuite needs to be improved with regards 
> to LTO testing as there was no new failure with the patch.

Not GCC, but gfortran. I stumbled on this pr with

make -k check-gfortran
RUNTESTFLAGS="--target_board=unix'{-m32/-flto,-m64/-flto}'"

One may consider to add something '-Ofast -flto' to the set of options in
gfortran.dg.