libctf: suppress spurious failure of malloc-counting tests under valgrind

The libctf-regression/open-error-free.c test works by interposing malloc
and counting mallocs and frees across libctf operations.  This only
works under suitably-interposable mallocs on systems supporting
dlsym (RTLD_NEXT, ...), so its operation is restricted to glibc
systems for now, but also it interacts badly with valgrind, which
interposes malloc itself.  Detect a running valgrind and skip the test.

Add new facilities allowing libctf lookup tests to declare themselves
unsupported, by printing "UNSUPPORTED: " and then some meaningful
message instead of their normal output.

libctf/
	* configure.ac: Check for <valgrind/valgrind.h>.
	* config.h.in: Regenerate.
	* configure: Likewise.
	* testsuite/lib/ctf-lib.exp (run_lookup_test): Add support for
	UNSUPPORTED tests.
	* testsuite/libctf-regression/open-error-free.c: When running
	under valgrind, this test is unsupported.

1 files changed, 1 insertions, 1 deletions

diff --git a/libctf/configure b/libctf/configure
index 1faadef..7466d56 100755
--- a/libctf/configure
+++ b/libctf/configure
@@ -16552,7 +16552,7 @@ $as_echo "#define AC_APPLE_UNIVERSAL_BUILD 1" >>confdefs.h
  presetting ac_cv_c_bigendian=no (or yes) will help" "$LINENO" 5 ;;
  esac
 
-for ac_header in byteswap.h endian.h
+for ac_header in byteswap.h endian.h valgrind/valgrind.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"