[gcc(refs/users/aoliva/heads/testme)] testsuite: outputs.exp: test for skip_atsave more thoroughly

[Alexandre Oliva <aoliva@gcc.gnu.org>]

https://gcc.gnu.org/g:ff3b53148270ae5646c32c58f7e396ca5dbd8f34

commit ff3b53148270ae5646c32c58f7e396ca5dbd8f34
Author: Alexandre Oliva <oliva@adacore.com>
Date:   Mon Jun 20 19:43:50 2022 -0300

    testsuite: outputs.exp: test for skip_atsave more thoroughly
    
    The presence of -I or -L flags in link command lines changes the
    driver's, and thus the linker's behavior, WRT naming files with
    command-line options.  With such flags, the driver creates .args.0 and
    .args.1 files, whereas without them it's the linker (collect2, really)
    that creates .ld1_args.
    
    I've hit some fails on a target system that doesn't have -I or -L
    flags in the board config file, but it does add some of them
    implicitly with configured-in driver self specs.  Alas, the test in
    outputs.exp doesn't catch that, so we proceed to run rather than
    skip_atsave tests.
    
    I've reworked the outest procedure to allow dry runs and to return
    would-have-been pass/fail results as lists, so we can now test whether
    certain files are created and use that to configure the actual test
    runs.
    
    
    for  gcc/testsuite/ChangeLog
    
            * gcc.misc-tests/outputs.exp (outest): Introduce quiet mode,
            create and return lists of passes and fails.  Use it to catch
            skip_atsave cases where -L flags are implicitly added by
            driver self specs.

Diff:
---
 gcc/testsuite/gcc.misc-tests/outputs.exp | 49 +++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 7 deletions(-)

diff --git a/gcc/testsuite/gcc.misc-tests/outputs.exp b/gcc/testsuite/gcc.misc-tests/outputs.exp
index afae735e92d..a63ce66693b 100644
--- a/gcc/testsuite/gcc.misc-tests/outputs.exp
+++ b/gcc/testsuite/gcc.misc-tests/outputs.exp
@@ -116,8 +116,23 @@ if [info exists env(MAKEFLAGS)] {
 # it weren't for
 # https://core.tcl-lang.org/tcl/tktview?name=5bbd044812), but .{i,s,o}
 # and .[iso] will pass even if only the .o is present.
+
+# Return a list containing two lists, the first naming the passes, the
+# second naming the fails.  If test ends with a question mark, the
+# test is taken as a preparatory test or cleanup, and no pass or fail
+# results will be logged, though the lists will still be built and
+# returned.
 array unset outests *
 proc outest { test sources opts dirs outputs } {
+    if { [string index $test end] == "?" } {
+	set quiet 1
+    } else {
+	set quiet 0
+    }
+
+    set passes {}
+    set fails {}
+
     global b srcdir subdir
     global outests
 
@@ -182,15 +197,15 @@ proc outest { test sources opts dirs outputs } {
 		set o "$og"
 	    }
 	    if { [file exists $d$o] } then {
-		pass "$test: $d$o"
+		lappend passes "$d$o"
 		file delete $d$o
 	    } else {
 	        set ogl [glob -nocomplain -path $d -- $o]
 		if { $ogl != {} } {
-		    pass "$test: $d$o"
+		    lappend passes "$d$o"
 		    file delete $ogl
 		} else {
-		    fail "$test: $d$o"
+		    lappend fails "$d$o"
 		}
 	    }
 	}
@@ -219,17 +234,27 @@ proc outest { test sources opts dirs outputs } {
     }
 
     if { [llength $outb] == 0 } then {
-	pass "$test: extra"
+	lappend passes "extra"
     } else {
-	fail "$test: extra\n$outb"
+	lappend fails "extra\n$outb"
     }
 
     if { [string equal "$gcc_output" ""] } then {
-	pass "$test: std out"
+	lappend passes "std out"
     } else {
-	fail "$test: std out\n$gcc_output"
+	lappend fails "std out\n$gcc_output"
     }
 
+    if !$quiet {
+	foreach p $passes {
+	    pass "$test: $p"
+	}
+	foreach f $fails {
+	    fail "$test: $f"
+	}
+    }
+
+    return [list $passes $fails]
 }
 
 set sing {-0.c}
@@ -279,6 +304,16 @@ if { "$aout" != "" } then {
     set oaout "-o $aout"
 }
 
+# Sometimes the -I or -L flags that cause the compiler driver to save
+# .args.[01], instead of leaving it for the linker to save .ld1_args,
+# is hiding in driver self specs.
+if !$skip_atsave {
+    set atsave_test_out [outest "$b-skip-atsave?" $sing "@/dev/null -o $b.exe -save-temps" {} {{.args.1}}]
+    if { [lindex [lindex $atsave_test_out 0] 0] == "$b.args.1" } {
+	set skip_atsave 1
+    }
+}
+
 # Driver-chosen outputs.
 outest "$b-1 asm default 1" $sing "-S" {} {{-0.s}}
 outest "$b-2 asm default 2" $mult "-S" {} {{-1.s -2.s}}