[Bug 3809] snprintf const char *fmt detection false negatives with Clang and _FORTIFY_SOURCE=2

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3809

--- Comment #5 from Jose Luis Duran <jlduran at gmail.com> ---
(In reply to Jose Luis Duran from comment #4)

> $ ./configure --with-cflags=-D_FORTIFY_SOURCE=2 2>&1 | grep snprintf
> checking for snprintf... yes
> checking for vsnprintf... yes
> checking whether snprintf correctly terminates long strings... no
> configure: WARNING: ****** Your snprintf() function is broken,
> complain to your vendor
> checking whether snprintf understands %zu... no
> checking whether vsnprintf returns correct values on overflow... yes
> checking whether snprintf can declare const char *fmt... no

That last check should have been:

$ ./configure --with-cflags=-D_FORTIFY_SOURCE=2 2>&1 | grep snprintf
checking for snprintf... yes
checking for vsnprintf... yes
checking whether snprintf correctly terminates long strings... yes
checking whether snprintf understands %zu... yes
checking whether vsnprintf returns correct values on overflow... yes
checking whether snprintf can declare const char *fmt... no

Same for NetBSD (FreeBSD's upstream for source fortification), using
CC=clang.

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