https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78110
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Bernd Edlinger from comment #1)
> oh, I am using eCos and that is based on newlib but on a very very old one.
> I don't know what happens when I dont use --with-newlib, but I can try...
>
> configure.ac has this:
> # First, test for "known" system libraries. We may be using newlib even
> # on a hosted environment.
> if test "x${with_newlib}" = "xyes"; then
> os_include_dir="os/newlib"
> AC_DEFINE(HAVE_HYPOT)
>
> ...
>
> AC_DEFINE(HAVE_ICONV)
> AC_DEFINE(HAVE_MEMALIGN)
>
> why are these not compile-time checks, to see if the headers are available?
Ah .. it's supposed to be. See line 259:
AC_CHECK_FUNCS(aligned_alloc posix_memalign memalign _aligned_malloc)
That was added to support the new code in libsupc++/new_opa.cc
But it doesn't work for newlib, because of the hardcoded definitions on line
327.
Presumably newlib does have memalign, but just not in malloc.h?
