Bug#831449: lintian on Sid amd64 reports volatile false spelling errors in binaries

[Jakub Wilk <jwilk@debian.org>]

* Thomas Schmitt <scdbackup@gmx.net>, 2016-07-18, 21:32:
> > It turns out that GCC optimized strcpy() into a series of move 
> > instructions.
>
> Maybe one can disable this feature ?
>  http://stackoverflow.com/questions/13059044/how-can-i-prevent-strcpy-being-optimised
> proposes -fno-builtin-strcpy.
>
> I tried with GNU xorriso and CFLAGS="$CFLAGS -fno-builtin-strcpy".
> No change to see in the resulting binary xorriso/xorriso.

That's odd. In my tests (on a tiny test program) -fno-builtin-strcpy did 
the trick...

...unless I enabled -D_FORTIFY_SOURCE=2, in which case even -fno-builtin 
made no difference. :-/

> So it seems to be about some other suffix to "-fno-builtin-".
> gcc --help does not list any. man gcc gives no list but mentions "see 
> X86 Built-in Functions". I found:
>  https://gcc.gnu.org/onlinedocs/gcc-4.8.5/gcc/X86-Built-in-Functions.html

These are only X86-specific built-in functions.
Builtins that correspond to libc functions are listed here:
https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html

--
Jakub Wilk