Re: [PATCH] libc/stdlib: Fix build failure in nano_calloc

[Corinna Vinschen <vinschen@redhat.com>]

On Aug 12 15:33, Craig Blackmore wrote:
> commit 588a5e1ddebdf6d74391c7409680ea20e050c0e1 added a non-reentrant
> call to nano_malloc which causes a build failure if INTERNAL_NEWLIB is
> defined.
> 
> Here is a snippet of the error:
> 
> In file included from .../newlib/newlib/libc/stdlib/nano-mallocr.c:38:
> .../newlib/newlib/libc/include/malloc.h:42:25: note: expected 'struct _reent *' but argument is of type 'ptrdiff_t' {aka 'int'}
>    42 | extern void *_malloc_r (struct _reent *, size_t);
>       |                         ^~~~~~~~~~~~~~~
> .../newlib/newlib/libc/stdlib/nano-mallocr.c:67:22: error: too few arguments to function '_malloc_r'
>    67 | #define nano_malloc  _malloc_r
>       |                      ^~~~~~~~~
> .../newlib/newlib/libc/stdlib/nano-mallocr.c:456:11: note: in expansion of macro 'nano_malloc'
>   456 |     mem = nano_malloc(bytes);
>       |           ^~~~~~~~~~~
> In file included from .../newlib/newlib/libc/stdlib/nano-mallocr.c:38:
> .../newlib/newlib/libc/include/malloc.h:42:14: note: declared here
>    42 | extern void *_malloc_r (struct _reent *, size_t);
>       |              ^~~~~~~~~
> .../newlib/newlib/libc/stdlib/nano-mallocr.c:43: warning: "assert" redefined
>    43 | #define assert(x) ((void)0)
>       |
> 
> This patch adds a missing RCALL to the args when calling nano_malloc
> from nano_calloc, so that if the call is reentrant, reent_ptr is passed
> as the first argument.
> 
> The variable `bytes` (also added in 588a5e1d) has been changed from a
> `ptrdiff_t` to `malloc_size_t` as it does not need to be signed. It is
> used to store the product of two unsigned malloc_size_t variables and
> then iff there was no overflow is it passed to malloc and memset which
> both expect size_t which is unsigned.
> 
> Signed-off-by: Craig Blackmore <craig.blackmore@embecosm.com>
> ---
>  newlib/libc/stdlib/nano-mallocr.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Pushed.


Thanks,
Corinna

-- 
Corinna Vinschen
Cygwin Maintainer
Red Hat