[binutils-gdb] gas warning fixes

[Alan Modra]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=ca159256b4eb2c3bf245aef7f05a24fcc1ca6d9b

commit ca159256b4eb2c3bf245aef7f05a24fcc1ca6d9b
Author: Alan Modra <amodra@gmail.com>
Date:   Tue Aug 25 09:57:58 2020 +0930

    gas warning fixes
    
    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:
---
 gas/ChangeLog            | 10 ++++++++++
 gas/config/tc-arc.c      |  2 +-
 gas/config/tc-epiphany.c |  4 ++--
 gas/config/tc-mips.c     |  2 +-
 gas/config/tc-mmix.c     |  2 +-
 gas/config/tc-nds32.c    |  1 +
 6 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/gas/ChangeLog b/gas/ChangeLog
index b6f4eddaa09..f8d049bb8d4 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,13 @@
+2020-08-25  Alan Modra  <amodra@gmail.com>
+
+	* 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.
+
 2020-08-24  Cooper Qu  <cooper.qu@linux.alibaba.com>
 
 	* config/tc-csky.c (csky_archs): Add item for CK860,
diff --git a/gas/config/tc-arc.c b/gas/config/tc-arc.c
index 32369a56a17..bafa2a5eec9 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 836b23b7103..552f7dac150 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 b1786824f99..00e9eceef15 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 c469a62f0ec..82a9f8318b9 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 62bbad74092..b23f32676c5 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.  */