[glibc] Fix test isolation for elf/tst-ifunc-fault-lazy, elf/tst-ifunc-fault-bindnow

[Florian Weimer <fw@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=6a265e577e8d7c9c950a793139df19b2d050ce5b

commit 6a265e577e8d7c9c950a793139df19b2d050ce5b
Author: Florian Weimer <fweimer@redhat.com>
Date:   Thu Dec 19 14:45:50 2019 +0100

    Fix test isolation for elf/tst-ifunc-fault-lazy, elf/tst-ifunc-fault-bindnow
    
    Previously, ld.so was invoked only with the elf subdirectory on the
    library search path.  Since the soname link for libc.so only exists in
    the top-level build directory, this leaked the system libc into the
    test.

Diff:
---
 elf/Makefile | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/elf/Makefile b/elf/Makefile
index 72a5aa8..f861126 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -1375,10 +1375,9 @@ $(objpfx)ifuncmain5picstatic: $(addprefix $(objpfx),ifuncdep5pic.o)
 LDFLAGS-tst-ifunc-fault-lazy = -Wl,-z,lazy
 LDFLAGS-tst-ifunc-fault-bindnow = -Wl,-z,now
 define tst-ifunc-fault-script
-( $(objpfx)ld.so --verify --library-path  $(objpfx) $^ \
-  && LD_TRACE_LOADED_OBJECTS=1 $(objpfx)ld.so --library-path $(objpfx) $^ \
-  && LD_TRACE_LOADED_OBJECTS=1 LD_DEBUG=unused \
-    $(objpfx)ld.so --library-path  $(objpfx) $^ \
+( $(rtld-prefix) --verify $^ \
+  && LD_TRACE_LOADED_OBJECTS=1 $(rtld-prefix) $^ \
+  && LD_TRACE_LOADED_OBJECTS=1 LD_DEBUG=unused $(rtld-prefix) $^ \
 ) > $@; $(evaluate-test)
 endef
 $(objpfx)tst-ifunc-fault-lazy.out: $(objpfx)tst-ifunc-fault-lazy $(objpfx)ld.so