Re: [Valgrind-developers] missing -Wformat warnings

[Paul F. <pj...@wa...>]

On 08/05/2025 11:31, Florian Krohm wrote:
>
> I am wondering whether adding -nodefaultlibs to the compile flags helps.
>
> <quote>
> '-nodefaultlibs'
>      Do not use the standard system libraries when linking.  ...
> </quote>
>
> If GCC still adds a dependency on a library function that I'm telling 
> it won't be there - that would be quite odd...

Unfortunately it _is_ a bit odd

https://godbolt.org/z/86nrE4odb

> Could you give that a try? Or may be change VG_(strlen) to return 
> __builtin_strlen(str) ?
>
__builtin_strlen() isn't builtin either, it results in a call to strlen().

LLVM has __attribute__((no_builtin("strlen"))) but not GCC so we can't 
use that.

The only alternative I have for the moment is to drop the optimization 
level to 01 as in the godbolt link above. There are 4 places in the code 
where I had to do that (3 strlen replacements and 
drd_pre_mem_read_asciiz which is effectively doing an strlen as a check 
before calling DRD_(trace_load)).

A+

Paul