Tested x86_64-pc-linux-gnu, OK for trunk?

-- 8< --

Since modules aren't enabled by default at any -std= yet, let's add a
pseudo-std for them, like we already have for -fimplicit-constexpr.  And
also add to target-supports so dg lines can check { target modules }.

libstdc++-v3/ChangeLog:

        * testsuite/Makefile.am (CLEANFILES): Add gcm.cache.
        * testsuite/Makefile.in: Regenerate.
        * testsuite/lib/dg-options.exp (add_options_for_no_pch): Also add
        -fno-modules.
        * testsuite/lib/libstdc++.exp: Handle "modules" std.

gcc/testsuite/ChangeLog:

        * lib/g++-dg.exp: Handle "modules" std.
        * lib/target-supports.exp (check_effective_target_modules): New.
---
 gcc/testsuite/lib/g++-dg.exp              | 1 +
 gcc/testsuite/lib/target-supports.exp     | 4 ++++
 libstdc++-v3/testsuite/Makefile.am        | 2 +-
 libstdc++-v3/testsuite/Makefile.in        | 2 +-
 libstdc++-v3/testsuite/lib/dg-options.exp | 2 +-
 libstdc++-v3/testsuite/lib/libstdc++.exp  | 7 +++++++
 6 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/gcc/testsuite/lib/g++-dg.exp b/gcc/testsuite/lib/g++-dg.exp
index 042a9171c75..d30e242b465 100644
--- a/gcc/testsuite/lib/g++-dg.exp
+++ b/gcc/testsuite/lib/g++-dg.exp
@@ -92,6 +92,7 @@ proc g++-std-flags { test } {
        set option_list { }
        foreach x $std_list {
            if { $x eq "impcx" } then { set x "26 -fimplicit-constexpr" }
+           if { $x eq "modules" } then { set x "23 -fmodules 
-flang-info-include-translate" }
            lappend option_list "${std_prefix}$x"
        }
     } else {
diff --git a/gcc/testsuite/lib/target-supports.exp 
b/gcc/testsuite/lib/target-supports.exp
index 67f1a3c8230..a26938a3170 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -12282,6 +12282,10 @@ proc check_effective_target_implicit_constexpr { } {
     return [check-flags { "" { } { -fimplicit-constexpr } }]
 }
 
+proc check_effective_target_modules { } {
+    return [check-flags { "" { } { -fmodules } }]
+}
+
 # Return 1 if expensive testcases should be run.
 
 proc check_effective_target_run_expensive_tests { } {
diff --git a/libstdc++-v3/testsuite/Makefile.am 
b/libstdc++-v3/testsuite/Makefile.am
index bbdb72e9cf5..d7ebbc6f34c 100644
--- a/libstdc++-v3/testsuite/Makefile.am
+++ b/libstdc++-v3/testsuite/Makefile.am
@@ -247,7 +247,7 @@ check-performance-parallel: testsuite_files_performance 
${performance_script}
 # By adding these files here, automake will remove them for 'make clean'
 CLEANFILES = *.txt *.tst *.exe core* filebuf_* tmp* ostream_* *.log *.sum \
             testsuite_* site.exp abi_check baseline_symbols *TEST* *.dat \
-            *.ii *.s *.o *.cc *.x *.a *.so *.xml *.raw *.out *.gdb
+            *.ii *.s *.o *.cc *.x *.a *.so *.xml *.raw *.out *.gdb gcm.cache
 
 # To remove directories.
 clean-local:
diff --git a/libstdc++-v3/testsuite/Makefile.in 
b/libstdc++-v3/testsuite/Makefile.in
index aeb3f716216..90741d435ba 100644
--- a/libstdc++-v3/testsuite/Makefile.in
+++ b/libstdc++-v3/testsuite/Makefile.in
@@ -435,7 +435,7 @@ parallel_flags = "unix/-D_GLIBCXX_PARALLEL/-fopenmp"
 # By adding these files here, automake will remove them for 'make clean'
 CLEANFILES = *.txt *.tst *.exe core* filebuf_* tmp* ostream_* *.log *.sum \
             testsuite_* site.exp abi_check baseline_symbols *TEST* *.dat \
-            *.ii *.s *.o *.cc *.x *.a *.so *.xml *.raw *.out *.gdb
+            *.ii *.s *.o *.cc *.x *.a *.so *.xml *.raw *.out *.gdb gcm.cache
 
 all: all-am
 
diff --git a/libstdc++-v3/testsuite/lib/dg-options.exp 
b/libstdc++-v3/testsuite/lib/dg-options.exp
index 937a8224756..337f3502629 100644
--- a/libstdc++-v3/testsuite/lib/dg-options.exp
+++ b/libstdc++-v3/testsuite/lib/dg-options.exp
@@ -290,7 +290,7 @@ proc add_options_for_no_pch { flags } {
     # Remove any inclusion of bits/stdc++.h from the options.
     regsub -all -- "-include bits/stdc...h" $flags "" flags
     # This forces any generated and possibly included PCH to be invalid.
-    return "$flags -D__GLIBCXX__=99999999"
+    return "$flags -fno-modules -D__GLIBCXX__=99999999"
 }
 
 # Add to FLAGS all the target-specific flags needed for networking.
diff --git a/libstdc++-v3/testsuite/lib/libstdc++.exp 
b/libstdc++-v3/testsuite/lib/libstdc++.exp
index 9f2dd8a1724..15b052d941b 100644
--- a/libstdc++-v3/testsuite/lib/libstdc++.exp
+++ b/libstdc++-v3/testsuite/lib/libstdc++.exp
@@ -496,10 +496,16 @@ if [info exists env(GLIBCXX_TESTSUITE_STDS)] {
     set v3_std_list [split $env(GLIBCXX_TESTSUITE_STDS) ","]
 }
 
+# Allow adjusting which -std we test with -fmodules.
+if ![info exists v3_modules_std] {
+    set v3_modules_std "26"
+}
+
 # Modified dg-runtest that runs tests in multiple standard modes,
 # unless they specifically specify one standard.
 proc v3-dg-runtest { testcases flags default-extra-flags } {
     global runtests
+    global v3_modules_std
 
     foreach test $testcases {
        # If we're only testing specific files and this isn't one of them, skip 
it.
@@ -546,6 +552,7 @@ proc v3-dg-runtest { testcases flags default-extra-flags } {
            set option_list { }
            foreach x $std_list {
                if { $x eq "impcx" } then { set x "26 -fimplicit-constexpr" }
+               if { $x eq "modules" } then { set x "$v3_modules_std -fmodules 
-flang-info-include-translate" }
                lappend option_list "${std_prefix}$x"
            }
        } else {

base-commit: 52a24bcecd388ab6e7d4e6500809fc761f6e7ca5
-- 
2.51.0

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