gas warning fixes

[Alan Modra]

Some versions of gcc with -Werror=format-overflow complain about using
a perfectly good 7 char buffer for "r%dr%d" when the int is between 0
and 64, apparently not seeing the value range.

note: ‘__builtin___sprintf_chk’ output between 5 and 24 bytes into a destination of size 7

	* config/tc-arc.c (declare_register_set): Avoid false positive
	format-overflow warning.
	* config/tc-epiphany.c (md_assemble): Likewise.
	* config/tc-mips.c (md_begin): Likewise.
	* config/tc-mmix.c (mmix_md_begin): Likewise.
	* config/tc-nds32.c (nds32_elf_append_relax_relocs): Avoid false
	positive "may be used uninitialized" warning.

diff --git a/gas/config/tc-arc.c b/gas/config/tc-arc.c
index 32369a56a1..bafa2a5eec 100644
--- a/gas/config/tc-arc.c
+++ b/gas/config/tc-arc.c
@@ -2562,7 +2562,7 @@ declare_register_set (void)
   int i;
   for (i = 0; i < 64; ++i)
     {
-      char name[7];
+      char name[32];
 
       sprintf (name, "r%d", i);
       declare_register (name, i);
diff --git a/gas/config/tc-epiphany.c b/gas/config/tc-epiphany.c
index 836b23b710..552f7dac15 100644
--- a/gas/config/tc-epiphany.c
+++ b/gas/config/tc-epiphany.c
@@ -550,7 +550,7 @@ md_assemble (char *str)
 
   if (push && regmask)
     {
-      char buff[20];
+      char buff[32];
       int i,p ATTRIBUTE_UNUSED;
 
       epiphany_assemble ("mov r15,4");
@@ -570,7 +570,7 @@ md_assemble (char *str)
     }
   else if (pop && regmask)
     {
-      char buff[20];
+      char buff[32];
       int i,p;
 
       epiphany_assemble ("mov r15,4");
diff --git a/gas/config/tc-mips.c b/gas/config/tc-mips.c
index b1786824f9..00e9eceef1 100644
--- a/gas/config/tc-mips.c
+++ b/gas/config/tc-mips.c
@@ -3806,7 +3806,7 @@ md_begin (void)
 
   for (i = 0; i < 32; i++)
     {
-      char regname[6];
+      char regname[16];
 
       /* R5900 VU0 floating-point register.  */
       sprintf (regname, "$vf%d", i);
diff --git a/gas/config/tc-mmix.c b/gas/config/tc-mmix.c
index c469a62f0e..82a9f8318b 100644
--- a/gas/config/tc-mmix.c
+++ b/gas/config/tc-mmix.c
@@ -780,7 +780,7 @@ mmix_md_begin (void)
   /* We always insert the ordinary registers 0..255 as registers.  */
   for (i = 0; i < 256; i++)
     {
-      char buf[5];
+      char buf[16];
 
       /* Alternatively, we could diddle with '$' and the following number,
 	 but keeping the registers as symbols helps keep parsing simple.  */
diff --git a/gas/config/tc-nds32.c b/gas/config/tc-nds32.c
index 62bbad7409..b23f32676c 100644
--- a/gas/config/tc-nds32.c
+++ b/gas/config/tc-nds32.c
@@ -6053,6 +6053,7 @@ nds32_elf_append_relax_relocs (const char *key, const void *value)
       fixup_size = fixup_now->size;
 
       /* Insert all fixup.  */
+      pcrel = 0;
       while (fixup_size != 0 && fixup_now->offset == offset)
 	{
 	  /* Set the real instruction size in element.  */

-- 
Alan Modra
Australia Development Lab, IBM