[gcc r11-11342] testsuite, Darwin : Do not claim 'GAS' for cctools assembler.

[Iain D Sandoe <iains@gcc.gnu.org>]

https://gcc.gnu.org/g:5568dda5a01cba6925b3fe5a2ae8a56caee539c5

commit r11-11342-g5568dda5a01cba6925b3fe5a2ae8a56caee539c5
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Mon Mar 15 21:38:31 2021 +0000

    testsuite, Darwin : Do not claim 'GAS' for cctools assembler.
    
    Although the cctools assembler is based of GNU GAS, it is from a
    very old version (1.38) which does not support many of the features
    that the target supports test is expecting.
    
    gcc/testsuite/ChangeLog:
    
            * lib/target-supports.exp: Exclude cctools assembler based on
            GAS 1.38.
    
    (cherry picked from commit e42ea63bcc12e819c3e1066974a691988e86b724)

Diff:
---
 gcc/testsuite/lib/target-supports.exp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index 63a5f5579be..876b972a433 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -9576,7 +9576,14 @@ proc check_effective_target_gas { } {
 	set status [remote_exec host "$gcc_as" "-v /dev/null"]
 	set as_output [lindex $status 1]
 	if { [ string first "GNU" $as_output ] >= 0 } {
-	    set use_gas_saved 1
+	    # Some Darwin versions have an assembler which is based on an old
+	    # version of GAS (and reports GNU assembler in its -v output) but
+	    # but doesn't support many of the modern GAS features.
+	    if { [ string first "cctools" $as_output ] >= 0 } {
+	        set use_gas_saved 0
+	    } else {
+	        set use_gas_saved 1
+	    }
 	} else {
 	    set use_gas_saved 0
 	}