From a4a94cf963d74970ec053dc7ecaddc9f2dc24f6d Mon Sep 17 00:00:00 2001
From: Chris Packham <judge.packham@gmail.com>
Date: Thu, 24 Apr 2025 17:31:36 +1200
Subject: [PATCH] libgloss: rs6000: Add missing function prototypes

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.
---
 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