[PATCH] gas: Update fr_literal access in frag for GCC 10

[H.J. Lu]

When access fr_literal in

struct frag {
  ...
  /* Data begins here.  */
  char fr_literal[1];
};

with

char *buf = fragp->fr_fix + fragp->fr_literal;

GCC 10 gave

gas/config/tc-csky.c: In function ‘md_convert_frag’:
gas/config/tc-csky.c:4507:9: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
 4507 |  buf[1] = BYTE_1 (CSKYV1_INST_SUBI | (7 << 4));
      |         ^

Change

  char *buf = fragp->fr_fix + fragp->fr_literal;

to

  char *buf = fragp->fr_fix + &fragp->fr_literal[0];

to silence GCC 10 warning.

	* config/tc-csky.c (md_convert_frag): Replace fragp->fr_literal
	with &fragp->fr_literal[0].
	* config/tc-microblaze.c (md_apply_fix): Likewise.
	* config/tc-sh.c (md_convert_frag): Likewise.
---
 gas/config/tc-csky.c       | 2 +-
 gas/config/tc-microblaze.c | 2 +-
 gas/config/tc-sh.c         | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/gas/config/tc-csky.c b/gas/config/tc-csky.c
index 83fca2af73..be54afbd67 100644
--- a/gas/config/tc-csky.c
+++ b/gas/config/tc-csky.c
@@ -4196,7 +4196,7 @@ void
 md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec,  fragS *fragp)
 {
   offsetT disp;
-  char *buf = fragp->fr_fix + fragp->fr_literal;
+  char *buf = fragp->fr_fix + &fragp->fr_literal[0];
 
   gas_assert (fragp->fr_symbol);
   if (IS_EXTERNAL_SYM (fragp->fr_symbol, asec))
diff --git a/gas/config/tc-microblaze.c b/gas/config/tc-microblaze.c
index 24ea358244..ae5d36dc9c 100644
--- a/gas/config/tc-microblaze.c
+++ b/gas/config/tc-microblaze.c
@@ -1983,7 +1983,7 @@ md_apply_fix (fixS *   fixP,
 	      valueT * valp,
 	      segT     segment)
 {
-  char *       buf  = fixP->fx_where + fixP->fx_frag->fr_literal;
+  char *       buf  = fixP->fx_where + &fixP->fx_frag->fr_literal[0];
   const char *       file = fixP->fx_file ? fixP->fx_file : _("unknown");
   const char * symname;
   /* Note: use offsetT because it is signed, valueT is unsigned.  */
diff --git a/gas/config/tc-sh.c b/gas/config/tc-sh.c
index d06cc5e9b8..42f7417c6e 100644
--- a/gas/config/tc-sh.c
+++ b/gas/config/tc-sh.c
@@ -3081,7 +3081,7 @@ md_convert_frag (bfd *headers ATTRIBUTE_UNUSED, segT seg, fragS *fragP)
 	 differently from ones without delay slots.  */
       {
 	unsigned char *buffer =
-	  (unsigned char *) (fragP->fr_fix + fragP->fr_literal);
+	  (unsigned char *) (fragP->fr_fix + &fragP->fr_literal[0]);
 	int highbyte = target_big_endian ? 0 : 1;
 	int lowbyte = target_big_endian ? 1 : 0;
 	int delay = fragP->fr_subtype == C (COND_JUMP_DELAY, COND12);
-- 
2.26.2