conformtest: Skip execution tests when cross-compiling [committed]

[Joseph Myers <joseph at codesourcery dot com>]

This patch makes conformtest skip execution tests when
cross-compiling, as an interim step towards running most of these
tests (presently disabled) in that case.  It omits the (obvious)
Makefile change to actually enable the conformtest tests when
cross-compiling, as there are still enough failures seen with
build-many-glibcs.py that I'd like to get the results cleaner before
enabling these tests.

Tested for x86_64, and with the tests actually enabled for
cross-compilation with build-many-glibcs.py.  Committed.

2017-03-17  Joseph Myers  <joseph@codesourcery.com>

	* conform/conformtest.pl ($cross): New variable.
	(--cross): New command-line option.
	(runtest): Skip test execution when cross-compiling.
	* conform/Makefile (conformtest-cross): New variable.
	($(conformtest-header-tests)): Pass $(conformtest-cross) to
	conformtest.pl.

diff --git a/conform/Makefile b/conform/Makefile
index c07cc1d..eb2288f 100644
--- a/conform/Makefile
+++ b/conform/Makefile
@@ -197,13 +197,19 @@ conformtest-cc-flags = -I../include $(+sysdep-includes) $(sysincludes) -I..
 # in xfail[cond]- lines in test expectations.
 conformtest-xfail = $(if $(conformtest-xfail-conds),\
 			 --xfail='$(conformtest-xfail-conds)')
+ifeq (no,$(cross-compiling))
+conformtest-cross =
+else
+conformtest-cross = --cross
+endif
 $(conformtest-header-tests): $(objpfx)%/conform.out: \
 			     conformtest.pl $(conformtest-headers-data)
 	(set -e; std_hdr=$*; std=$${std_hdr%%/*}; hdr=$${std_hdr#*/}; \
 	 mkdir -p $(@D)/scratch; \
 	 $(PERL) -I. conformtest.pl --tmpdir=$(@D)/scratch --cc='$(CC)' \
 		 --flags='$(conformtest-cc-flags)' --standard=$$std \
-		 --headers=$$hdr $(conformtest-xfail) > $@); \
+		 --headers=$$hdr $(conformtest-xfail) $(conformtest-cross) \
+		 > $@); \
 	$(evaluate-test)
 
 $(linknamespace-symlists-tests): $(objpfx)symlist-%: list-header-symbols.pl
diff --git a/conform/conformtest.pl b/conform/conformtest.pl
index 41682e9..7594f46 100644
--- a/conform/conformtest.pl
+++ b/conform/conformtest.pl
@@ -7,10 +7,11 @@ use POSIX;
 $standard = "XOPEN2K8";
 $CC = "gcc";
 $tmpdir = "/tmp";
+$cross = "";
 $xfail_str = "";
 GetOptions ('headers=s' => \@headers, 'standard=s' => \$standard,
 	    'flags=s' => \$flags, 'cc=s' => \$CC, 'tmpdir=s' => \$tmpdir,
-	    'xfail=s' => \$xfail_str);
+	    'cross' => \$cross, 'xfail=s' => \$xfail_str);
 @headers = split(/,/,join(',',@headers));
 
 # List of the headers we are testing.
@@ -192,6 +193,8 @@ sub runtest
       }
       note_error($xfail);
       $result = 1;
+    } elsif ($cross) {
+      printf (" SKIP\n");
     } else {
       # Now run the program.  If the exit code is not zero something is wrong.
       $result = system "$fnamebase > $fnamebase.out2 2>&1";

-- 
Joseph S. Myers
joseph@codesourcery.com