Re: Integer overflows in memchr

[Paul Eggert]

On 7/1/24 02:16, Po Lu wrote:

> but Gnulib (and by extension Emacs) does not invoke the Autoconf
> test:
>
> AC_DEFUN([gl_FUNC_STRNLEN],
> [
>    AC_REQUIRE([gl_STRING_H_DEFAULTS])
>
>    dnl Persuade glibc <string.h> to declare strnlen().
>    AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
>
>    AC_CHECK_DECLS_ONCE([strnlen]) <------------------------------------
>    if test $ac_cv_have_decl_strnlen = no; then
>      HAVE_DECL_STRNLEN=0
>    else
>      m4_pushdef([AC_LIBOBJ], [:])
>      dnl Note: AC_FUNC_STRNLEN does AC_LIBOBJ([strnlen]).


The line immediately after the last line you quoted is:

    AC_FUNC_STRNLEN

and that invokes the Autoconf test.