Avoid undefined behaviour with signed expressions

	PR 17453
bfd/
	* libbfd.c (COERCE16, COERCE32, COERCE64): Use unsigned types.
	(EIGHT_GAZILLION): Delete.
binutils/
	* dwarf.c (read_leb128): Avoid signed overflow.
	(read_debug_line_header): Likewise.
gas/
	* config/tc-i386.c (fits_in_signed_long): Use unsigned param and
	expression to avoid signed overflow.
	(fits_in_signed_byte, fits_in_unsigned_byte, fits_in_unsigned_word,
	fits_in_signed_word, fits_in_unsigned_long): Similarly.
	* expr.c (operand <'-'>): Avoid signed overflow.
	* read.c (s_comm_internal): Likewise.

1 files changed, 2 insertions, 1 deletions

diff --git a/gas/expr.c b/gas/expr.c
index eb7255f..0ccfbd3 100644
--- a/gas/expr.c
+++ b/gas/expr.c
@@ -1021,7 +1021,8 @@ operand (expressionS *expressionP, enum expr_mode mode)
 	    /* input_line_pointer -> char after operand.  */
 	    if (c == '-')
 	      {
-		expressionP->X_add_number = - expressionP->X_add_number;
+		expressionP->X_add_number
+		  = - (addressT) expressionP->X_add_number;
 		/* Notice: '-' may overflow: no warning is given.
 		   This is compatible with other people's
 		   assemblers.  Sigh.  */