When a multi-source module is found to be unsupported, we fail
module_cmi_p and subsequent sources.  Override proc unsupported to
mark the result in module_do, and test it to skip module_cmp_p and
subsequent related tests.

Regstrapped on x86_64-linux-gnu.
Tested on arm-vxworks7 (gcc-12) and arm-eabi (trunk).  Ok to install?

for  gcc/testsuite/ChangeLog

        * g++.dg/modules/modules.exp: Override unsupported to update
        module_do, and test it after dg-test.
---
 gcc/testsuite/g++.dg/modules/modules.exp |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/gcc/testsuite/g++.dg/modules/modules.exp 
b/gcc/testsuite/g++.dg/modules/modules.exp
index 61994b059457b..ba1287427bf05 100644
--- a/gcc/testsuite/g++.dg/modules/modules.exp
+++ b/gcc/testsuite/g++.dg/modules/modules.exp
@@ -315,6 +315,14 @@ proc module-check-requirements { tests } {
 # cleanup any detritus from previous run
 cleanup_module_files [find $DEFAULT_REPO *.gcm]
 
+set module_do {"compile" "P"}
+rename unsupported saved-unsupported
+proc unsupported { args } {
+    global module_do
+    lset module_do 1 "N"
+    return [saved-unsupported $args]
+}
+
 # not grouped tests, sadly tcl doesn't have negated glob
 foreach test [prune [lsort [find $srcdir/$subdir {*.[CH]}]] \
                  "$srcdir/$subdir/*_?.\[CH\]"] {
@@ -327,6 +335,9 @@ foreach test [prune [lsort [find $srcdir/$subdir {*.[CH]}]] 
\
            set module_cmis {}
            verbose "Testing $nshort $std" 1
            dg-test $test "$std" $DEFAULT_MODFLAGS
+           if { [lindex $module_do 1] == "N" } {
+               continue
+           }
            set testcase [string range $test [string length "$srcdir/"] end]
            cleanup_module_files [module_cmi_p $testcase $module_cmis]
        }
@@ -372,6 +383,9 @@ foreach src [lsort [find $srcdir/$subdir {*_a.[CHX}]] {
                        }
                    }
                    dg-test -keep-output $test "$std" $DEFAULT_MODFLAGS
+                   if { [lindex $module_do 1] == "N" } {
+                       break
+                   }
                    set testcase [string range $test [string length "$srcdir/"] 
end]
                    lappend mod_files [module_cmi_p $testcase $module_cmis]
                }

-- 
Alexandre Oliva, happy hacker                https://FSFLA.org/blogs/lxo/
   Free Software Activist                       GNU Toolchain Engineer
Disinformation flourishes because many people care deeply about injustice
but very few check the facts.  Ask me about <https://stallmansupport.org>

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