[PATCH] libgloss: rs6000: Add missing function prototypes

[Jeff Johnston]

Sorry for the delay.  Patch pushed to main.

-- Jeff J.

On Thu, May 22, 2025 at 3:50 AM Chris Packham <judge.packham@gmail.com>
wrote:

> 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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