[Bug preprocessor/107691] [10/11/12/13 Regression] libcpp configure fails on empty expansion

[schwab--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107691

Andreas Schwab <sch...@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[10/11/12/13 Regression]    |[10/11/12/13 Regression]
                   |libcpp configure fails on   |libcpp configure fails on
                   |bashism                     |empty expansion

--- Comment #2 from Andreas Schwab <sch...@linux-m68k.org> ---
That's 100% POSIX conforming, it's just $have_valgrind_h etc. expanding to
nothing (only gcc/configure has the necessary checks).