[PATCH] libgloss: rs6000: Add missing function prototypes

[Chris Packham]

Ping?

On Thu, 24 Apr 2025, 8:27 pm Chris Packham, <judge.packham@gmail.com> wrote:

> With recent GCC changes that have elevated some warnings to error by
> default the rs6000 sim code errors out with:
>
>   libgloss/rs6000/sim-inbyte.c:22:7: error: implicit declaration of
> function 'read' [-Wimplicit-function-declaration]
>   libgloss/rs6000/sim-sbrk.c:26:7: error: implicit declaration of function
> 'brk'; did you mean 'sbrk'?  [-Wimplicit-function-declaration]
>   libgloss/rs6000/sim-abort.c:19:3: error: implicit declaration of
> function 'write' [-Wimplicit-function-declaration]
>   libgloss/rs6000/sim-abort.c:20:3: error: implicit declaration of
> function 'exit' [-Wimplicit-function-declaration]
>   libgloss/rs6000/sim-print.c:29:3: error: implicit declaration of
> function 'write' [-Wimplicit-function-declaration]
>   libgloss/rs6000/mvme-print.c:34:11: error: implicit declaration of
> function '__pcrlf' [-Wimplicit-function-declaration]
>   libgloss/rs6000/mvme-print.c:44:19: error: implicit declaration of
> function '__outln' [-Wimplicit-function-declaration]
>   libgloss/rs6000/mvme-print.c:53:15: error: implicit declaration of
> function '__outstr' [-Wimplicit-function-declaration]
>   libgloss/rs6000/mbx-print.c:29:3: error: implicit declaration of
> function 'write' [-Wimplicit-function-declaration]
>
> Add extern declarations to avoid the errors.
> ---
> We've been seeing some failures in ct-ng builds due to some old warnings
> that recent versions of GCC treat as errors by default. The odd thing is
> that we attempt to demote these to warnings by setting the relevant
> CFLAGS (which usually works) but somehow when we build with `ct-ng V=0
> build` the flags get lost (not sure if that's a ct-ng bug or a newlib
> problem). Regardless these errors can be avoided by adding the relevant
> declarations.
>
>  libgloss/rs6000/mbx-print.c  | 2 ++
>  libgloss/rs6000/mvme-print.c | 3 +++
>  libgloss/rs6000/sim-abort.c  | 3 +++
>  libgloss/rs6000/sim-inbyte.c | 1 +
>  libgloss/rs6000/sim-print.c  | 2 ++
>  libgloss/rs6000/sim-sbrk.c   | 1 +
>  6 files changed, 12 insertions(+)
>
> diff --git a/libgloss/rs6000/mbx-print.c b/libgloss/rs6000/mbx-print.c
> index 64472ee68..591ca2d3e 100644
> --- a/libgloss/rs6000/mbx-print.c
> +++ b/libgloss/rs6000/mbx-print.c
> @@ -13,6 +13,8 @@
>   * they apply.
>   */
>
> +extern int write(int fd, const void *buf, unsigned int count);
> +
>  /*
>   * print -- do a raw print of a string
>   */
> diff --git a/libgloss/rs6000/mvme-print.c b/libgloss/rs6000/mvme-print.c
> index 8d195424e..d8f4c50d8 100644
> --- a/libgloss/rs6000/mvme-print.c
> +++ b/libgloss/rs6000/mvme-print.c
> @@ -12,6 +12,9 @@
>   * the new terms are clearly indicated on the first page of each file
> where
>   * they apply.
>   */
> +extern void __pcrlf(void);
> +extern void __outln(char *, char *);
> +extern void __outstr(char *, char *);
>
>  /*
>   * write -- write some bytes to the output device.
> diff --git a/libgloss/rs6000/sim-abort.c b/libgloss/rs6000/sim-abort.c
> index e1b59cf19..931f886ed 100644
> --- a/libgloss/rs6000/sim-abort.c
> +++ b/libgloss/rs6000/sim-abort.c
> @@ -14,6 +14,9 @@
>   * they apply.
>   */
>
> +extern int write(int fd, const void *buf, unsigned int count);
> +extern void exit(int status);
> +
>  void abort(void)
>  {
>    write (2, "Abort called.\n", sizeof("Abort called.\n")-1);
> diff --git a/libgloss/rs6000/sim-inbyte.c b/libgloss/rs6000/sim-inbyte.c
> index 787b68976..fe1ac2a8b 100644
> --- a/libgloss/rs6000/sim-inbyte.c
> +++ b/libgloss/rs6000/sim-inbyte.c
> @@ -13,6 +13,7 @@
>   * the new terms are clearly indicated on the first page of each file
> where
>   * they apply.
>   */
> +extern int read(int fd, void *buf, unsigned int count);
>
>  int
>  inbyte ()
> diff --git a/libgloss/rs6000/sim-print.c b/libgloss/rs6000/sim-print.c
> index c0b9adced..49596aff6 100644
> --- a/libgloss/rs6000/sim-print.c
> +++ b/libgloss/rs6000/sim-print.c
> @@ -13,6 +13,8 @@
>   * they apply.
>   */
>
> +extern int write(int fd, const void *buf, unsigned int count);
> +
>  /*
>   * print -- do a raw print of a string
>   */
> diff --git a/libgloss/rs6000/sim-sbrk.c b/libgloss/rs6000/sim-sbrk.c
> index 5c8bd6522..0bbfe334b 100644
> --- a/libgloss/rs6000/sim-sbrk.c
> +++ b/libgloss/rs6000/sim-sbrk.c
> @@ -13,6 +13,7 @@
>   * the new terms are clearly indicated on the first page of each file
> where
>   * they apply.
>   */
> +extern int brk(void *addr);
>
>  extern char _end[];
>  static char *curbrk = _end;
> --
> 2.49.0
>
>
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