gas: amend X_unsigned uses

PR gas/30688

X_unsigned being clear does not indicate a negative number; it merely
indicates a signed one (whose sign may still be clear). Amend two uses
by an actual value check.

gas/read.c

@@ -1751,7 +1751,7 @@ s_comm_internal (int param,
       ignore_rest_of_line ();
       goto out;
     }
-  else if (temp != size || !exp.X_unsigned)
+  else if (temp != size || (!exp.X_unsigned && exp.X_add_number < 0))
     {
       as_warn (_("size (%ld) out of range, ignored"), (long) temp);
       ignore_rest_of_line ();
@@ -2541,7 +2541,7 @@ parse_align (int align_bytes)
   if (exp.X_op == O_absent)
     goto no_align;
 
-  if (!exp.X_unsigned)
+  if (!exp.X_unsigned && exp.X_add_number < 0)
     {
       as_warn (_("alignment negative; 0 assumed"));
       align = 0;

gas/testsuite/gas/elf/common3.s

@@ -1 +1,8 @@
 	.comm foobar,30,4
+	.comm buf1, 5-1, 8
+	.comm buf2, 4, 9-1
+	.ifndef lcomm_align
+	.lcomm lbuf, 9-1
+	.else
+	.lcomm lbuf, 9-1, 8
+	.endif

gas/testsuite/gas/elf/common3a.d

@@ -1,7 +1,16 @@
 #source: common3.s
 #as: --elf-stt-common=yes
 #readelf: -s -W
+# MIPS'es IRIX emulation puts lbuf (STB_LOCAL) after the globals in the
+# symbol table, and that mode is hard to check for (see irixemul in
+# binutils/testsuite/binutils-all/mips/mips.exp)
+#notarget: mips*-*-*
 
+#...
+ +[0-9]+: +0+ +8 +(OBJECT|NOTYPE) +LOCAL +DEFAULT +[1-9] +lbuf
 #...
  +[0-9]+: +0+4 +30 +COMMON +GLOBAL +DEFAULT +COM +foobar
+#...
+ +[0-9]+: +0+8 +4 +COMMON +GLOBAL +DEFAULT +COM +buf1
+ +[0-9]+: +0+8 +4 +COMMON +GLOBAL +DEFAULT +COM +buf2
 #pass

gas/testsuite/gas/elf/common3b.d

@@ -1,7 +1,16 @@
 #source: common3.s
 #as: --elf-stt-common=no
 #readelf: -s -W
+# MIPS'es IRIX emulation puts lbuf (STB_LOCAL) after the globals in the
+# symbol table, and that mode is hard to check for (see irixemul in
+# binutils/testsuite/binutils-all/mips/mips.exp)
+#notarget: mips*-*-*
 
+#...
+ +[0-9]+: +0+ +8 +(OBJECT|NOTYPE) +LOCAL +DEFAULT +[1-9] +lbuf
 #...
  +[0-9]+: +0+4 +30 +OBJECT +GLOBAL +DEFAULT +COM +foobar
+#...
+ +[0-9]+: +0+8 +4 +OBJECT +GLOBAL +DEFAULT +COM +buf1
+ +[0-9]+: +0+8 +4 +OBJECT +GLOBAL +DEFAULT +COM +buf2
 #pass

gas/testsuite/gas/elf/elf.exp

@@ -345,8 +345,16 @@ if { [is_elf_format] } then {
 
     # hpux has a non-standard common directive.
     if { ![istarget "*-*-hpux*"] } then {
-	run_dump_test "common3a"
-	run_dump_test "common3b"
+	switch -glob $target_triplet {
+	    ia64-*-* {
+		run_dump_test "common3a" { { as "--defsym lcomm_align=1" } }
+		run_dump_test "common3b" { { as "--defsym lcomm_align=1" } }
+	    }
+	    default {
+		run_dump_test "common3a"
+		run_dump_test "common3b"
+	    }
+	}
 	run_dump_test "common4a"
 	run_dump_test "common4b"
 	run_dump_test "common5a"