[PATCH] sim: ppc: fix printf warnings

[Mike Frysinger via Gdb-patches <gdb-patches@sourceware.org>]

This code hits some format-zero-length warnings, so hack the code
like we did in the common layers.
---
 sim/ppc/ChangeLog   |  6 ++++++
 sim/ppc/main.c      |  2 ++
 sim/ppc/sim_calls.c | 10 ++++++++--
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/sim/ppc/ChangeLog b/sim/ppc/ChangeLog
index b41d20230d95..7a23d68842bd 100644
--- a/sim/ppc/ChangeLog
+++ b/sim/ppc/ChangeLog
@@ -1,3 +1,9 @@
+2021-06-29  Mike Frysinger  <vapier@gentoo.org>
+
+	* main.c (sim_io_error): Add comment
+	* sim_calls.c (sim_io_error): Likewise.  Change "" to " ".
+	(error): Likewise.
+
 2021-06-20  Mike Frysinger  <vapier@gentoo.org>
 
 	* Makefile.in (INLINE_CFLAGS): Change to $(SIM_INLINE).
diff --git a/sim/ppc/main.c b/sim/ppc/main.c
index 0c1a070fc2c2..2d4d7e402753 100644
--- a/sim/ppc/main.c
+++ b/sim/ppc/main.c
@@ -214,6 +214,8 @@ sim_io_flush_stdoutput(void)
   }
 }
 
+/* Glue to use sim-fpu module.  */
+
 void
 sim_io_error (SIM_DESC sd, const char *msg, ...)
 {
diff --git a/sim/ppc/sim_calls.c b/sim/ppc/sim_calls.c
index 14d4d6586c78..ee9d123b1872 100644
--- a/sim/ppc/sim_calls.c
+++ b/sim/ppc/sim_calls.c
@@ -372,6 +372,8 @@ sim_io_flush_stdoutput(void)
   }
 }
 
+/* Glue to use sim-fpu module.  */
+
 void
 sim_io_error (SIM_DESC sd, const char *fmt, ...)
 {
@@ -379,7 +381,9 @@ sim_io_error (SIM_DESC sd, const char *fmt, ...)
   va_start(ap, fmt);
   callbacks->evprintf_filtered (callbacks, fmt, ap);
   va_end(ap);
-  callbacks->error (callbacks, "");
+  /* Printing a space here avoids empty printf compiler warnings.  Not ideal,
+     but we want error's side-effect where it halts processing.  */
+  callbacks->error (callbacks, " ");
 }
 
 /****/
@@ -391,7 +395,9 @@ error (const char *msg, ...)
   va_start(ap, msg);
   callbacks->evprintf_filtered (callbacks, msg, ap);
   va_end(ap);
-  callbacks->error (callbacks, "");
+  /* Printing a space here avoids empty printf compiler warnings.  Not ideal,
+     but we want error's side-effect where it halts processing.  */
+  callbacks->error (callbacks, " ");
 }
 
 void *
-- 
2.31.1